Severino Urtiga - Academia.edu (original) (raw)

Papers by Severino Urtiga

Anais do Congresso Internacional de Engenharia Mecânica e Industrial

Anais do Congresso Internacional de Engenharia Mecânica e Industrial, 2021

Anais do Congresso Internacional de Engenharia Mecânica e Industrial, 2021

Materials Science Forum, Aug 1, 2016

Aluminium alloy 7050 in a T7451 temper was friction-stir welded (FSW) to investigate the effects ... more Aluminium alloy 7050 in a T7451 temper was friction-stir welded (FSW) to investigate the effects of different process parameters on the microstructure and mechanical properties. Butt joints were obtained in 10mm thick-sheets, keeping a constant rotational speed of 550 rpm. Weld power and torque were recorded for each weld in order to obtain the heat input of the process, since the final properties of the welds are strongly related to this variable. The joints were characterized by optical microscopy and microhardness indentation through the stir zone (SZ), thermo-mechanically affected zone (TMAZ), and heat affected zone (HAZ) at different cross section heights. The processing of FSW, the microstructure in FSW alloys and the factors influencing weld quality are introduced.

Anais do Congresso Internacional de Engenharia Mecânica e Industrial, 2023

Anais do Congresso Internacional de Engenharia Mecânica e Industrial, 2023

Surface & Coatings Technology, Mar 1, 2023

Materials Research-ibero-american Journal of Materials, 2021

The use of nanocomposite coatings on carbon steel has been very promising. In this paper, the for... more The use of nanocomposite coatings on carbon steel has been very promising. In this paper, the formation mechanism of multilayer of Ni-Co/SiC nanocomposite coating electrodeposited in API 5L X80 steel was investigated. The coatings were obtained by galvanostatic deposition technique using a single bath and a single cathodic current density value. The results showed a variation in morphology and chemical composition of the coatings both on the surface and along the cross-section at all time conditions tested, confirming the functional gradient of the coating. The formation of the Ni-Co/SiC nanocomposite coating occurred through the multilayer deposition mechanism, with compositions mostly alternated between Ni and Co. The preferred orientation of the plane (220) and phase structure FCC remained constant on the surface of all the obtained samples. It was observed that the coating became more compact in the region located closer to the substrate, where an increase in micro-hardness was observed.

Impactos das Tecnologias na Engenharia de Materiais e Metalúrgica 2, 2021

Ciência e Engenharia de Materiais e o Desenvolvimento Socioambiental, 2019

Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atrib... more Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição 4.0 Internacional (CC BY 4.0). O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais.

ABM Proceedings, 2018

Nacional de Estudantes de Engenharia Metalúrgica, de Materiais e de Minas, parte integrante da AB... more Nacional de Estudantes de Engenharia Metalúrgica, de Materiais e de Minas, parte integrante da ABM Week, realizada de 17 a 21 de agosto de 2015, Rio de Janeiro, RJ, Brasil. EFEITOS DOS PROCESSOS DE CONFORMAÇÃO PLÁSTICA NAS PROPRIEDADES TERMOELÁSTICAS NUMA LIGA DE Ni-Ti COM MEMÓRIA DE FORMA* Cezar Henrique Gonzalez1 Niédson José da Silva2 Carlos Augusto do Nascimento Oliveira1 Oscar Olímpio de Araújo Filho1 Severino Leopoldino Urtiga Filho1 Luiz Carlos Sekitani da Silva3 Carlos José de Araújo4 Resumo Processos de conformação plástica têm sido aplicados nas ligas com memória de forma (LMF) para melhorar suas propriedades mecânicas. No entanto, estes processos provocam alterações das suas propriedades termoelásticas (temperaturas e entalpias de transformação, cargas críticas de indução da martensita, deformação termoelástica reversível e outras). Para aplicações tecnológicas destas ligas, por exemplo como atuadores termomecânicos, elas devem manter suas características constantes ao lo...

Materials Research, 2021

Biocorrosion is the main process that causes pipeline damages and losses in the oil industry. The... more Biocorrosion is the main process that causes pipeline damages and losses in the oil industry. The objective of this work was to investigate the influence of biofilm forming microorganisms on the biocorrosion of X80 steel exposed in produced water through microbiological characterization, film and biofilm analysis by optical microscopy and scanning electron microscopy, weight loss and surface analysis by laser confocal microscopy. Changes in produced water after 360 days were attributed to planktonic cells, temperature conditions, contact with air, photo-oxidation, biodegradation, and seasonality. The total aerobic bacteria presented sessile cell concentration of 7.39 x 10 4 CFU/cm 2 , while the other investigated groups showed lower concentrations. The micrography of the film showed salt crystals, whereas in the biofilm microorganisms, exopolysaccharides and corrosion products were observed. Weight loss after 360 days for the abiotic and biotic systems was 0.0222 g/cm 2 and 0.3039 g/cm 2 , respectively, showing that microorganisms accentuated the corrosion of X80 steel.

JOM, 2021

AISI 431 bead-on-plates were deposited on AISI 1010 by laser cladding, since it is a well-known c... more AISI 431 bead-on-plates were deposited on AISI 1010 by laser cladding, since it is a well-known corrosion-resistant material. The effects of laser power, scanning speed, powder feed rate and focal distance on the coatings’ geometry and dilution ratios, as well as microstructure evolution, iron dilution and microhardness of the beads were evaluated by optical and electron scanning microscopes, the last one coupled with x-ray energy dispersive spectroscopy, and microhardness test. The results showed that the clad height is mainly influenced by the scanning speed, while for the width, laser power, scanning speed and focal distance were crucial. Changing laser power has a more marked effect on the dilution than on the aspect ratio, while changing scanning speeds and focal distance shows a marked effect on both dilution and aspect ratio. The microstructure of coating zone is mainly composed by lath martensite. Furthermore, the average hardness by microindentation of the AISI 431 stainless steel cladding coating was about 5 times higher than that of the substrate.

Chemical Engineering and Processing - Process Intensification, 2021

Matéria (Rio de Janeiro), 2020

This work aims to evaluate the influence of welding parameters, current intensity and deposition ... more This work aims to evaluate the influence of welding parameters, current intensity and deposition speed, on the bead geometry, dilution, morphology and properties of a nickel-based alloy coating. For this, single beads of Inconel 625 alloy were deposited on the substrate of ASTM A36 Steel, by PTA-P process. The samples were sandblasted and polished. The samples were chemically etched by a solution of 92 mL HCl, 3 mL HNO 3 and 5 mL H 2 SO 4 for 5 minutes. The geometry of the beads (reinforcement height, bead width, penetration and contact angle) was measured through the digital stereoscope microscope. The microstructures of the cross sections were evaluated by optical microscopy and scanning electron microscopy (SEM), to identify the possible presence of precipitated phases in the ferrite matrix. The chemical composition of these present phases, as well as the diffused iron content from the substrate for the coating, were measured by EDX. The type of the phases precipitated by x-ray diffraction in the top samples of the coating were also evaluated, in 1.5 mm height of reinforcement. For mechanical property analysis, the microhardness of the coatings was measured by Vickers microhardness test to evaluate their relationship with the iron present in the coatings, which diffused from the substrate. The results confirmed the influence of welding parameters on coating dilution-Current is the parameter of greatest response. The morphologies of the coatings were presented as a γ matrix with second phase precipitation composed of Ni, Nb, Cr and Mo. The concentration of these precipitations decreased with increasing dilution. This occurred because of the increased migration of Fe present in the substrate of the coating through the diffusion phenomena, with increasing dilution. The Fe reduced the solubility of Nb and Mo of the γ matrix, causing the decrease of its hardness.

Matéria (Rio de Janeiro), 2020

RESUMO O presente trabalho teve como objetivo desenvolver e caracterizar revestimentos nanocompós... more RESUMO O presente trabalho teve como objetivo desenvolver e caracterizar revestimentos nanocompósitos de Ni e Ni-Grafeno aplicados em superfície de aço API 5L X80, utilizando o processo de eletrodeposição, para obter melhores propriedades anticorrosivas. Corpos de prova de dimensões de 20x20x3 mm foram submetidos à limpeza e preparação metalográfica, para posterior deposição dos revestimentos. Para o processo de eletrodeposição foi utilizado um banho à base de níquel contendo dodecil sulfato de sódio (SDS) como surfactante. Para obtenção dos revestimentos Ni-Grafeno, foram adicionadas partículas de grafeno (0,2g/L) ao banho eletrolítico. Os eletrodepósitos obtidos foram caracterizados por Difração de Raios-X (DRX) e Microscopia Eletrônica de Varredura (MEV). A resistência à corrosão dos revestimentos foi avaliada por meio de ensaios de Polarização Linear (PL) e Espectroscopia de Impedância Eletroquímica (EIE). A inserção de grafeno ao revestimento promoveu a formação de depósitos co...

Materials Research, 2019

This paper sets out to evaluate the corrosion of ASTM A131 grade A36 carbon steel exposed to a di... more This paper sets out to evaluate the corrosion of ASTM A131 grade A36 carbon steel exposed to a diesel oil S10 / saline water system and the biodegradation of diesel oil S10 to simulate storage, transport and fuel use systems during a period of 30 days. The corrosion process was investigated through electrochemical tests of Open Circuit Potential (OCP), Electrochemical Impedance Spectroscopy (EIS) and Linear Polarization (LP). The morphology of the corrosion products were analyzed by Scanning Electron Microscopy (SEM). The results showed that the presence of saline water in the system containing diesel oil is an aggravating factor which promotes the biodegradation of the fuel and, consequently, aggravates the corrosion process.

The International Journal of Advanced Manufacturing Technology, 2020

Hybrid laser-arc welding (HLAW) is a joining process that simultaneously combines arc and laser w... more Hybrid laser-arc welding (HLAW) is a joining process that simultaneously combines arc and laser welding in the same weld pool. The basic concept is to reduce the drawbacks and maximize the advantages of each individual welding process. In the present work, low-alloy steel NK: KD36 plates were welded by HLAW with the following thickness: 7, 9, 14, and 17 mm. The angular distortion and the transverse shrinkage caused by the process were investigated in the welded joint with different weld parameters. The laser-arc hybrid welding experiment was carried out using a 20-kW Yb: fiber laser, together with an arc welding machine (CO 2 arc welding). The laser axis was tilted to an angle of 10°, trailing with respect to the normal of the sample surface to avoid back reflections. The arc welding torch was inclined at an angle of 40°. The distance from the focus laser to arc torch was 5 mm. This investigation has shown that the hybrid laser-arc welding offers significant advantages compared with laser welding and arc welding. Compared with the conventional arc welding process, HLAW generates a lower transverse shrinkage and less weld pass for the same plate thickness. Although the coupling of the two processes leads to an increase in the number of parameters, it is the reason for the complexity of this process.

Materials Research, 2019

This paper aimed to develop and characterize superhydrophobic surfaces with anticorrosive propert... more This paper aimed to develop and characterize superhydrophobic surfaces with anticorrosive properties obtained by the chemical modification of the 5052 aluminum alloy with variation of acid etching time, formation of lamellar double hydroxides (LDH) film and immersion in stearic acid. The specimens were etched in HCl (2M) at 5, 10 and 30 min. The aluminum plates were treated with aqueous solution of zinc nitrate (0.1 M) in the presence of ammonia and then immersed in a stearic acid and ethanol solution (1% w/w) to reduce surface energy. Contact angles (CA) were determined. Surface morphology and composition were analyzed by scanning electron microscopy (SEM) and X-ray energy dispersion spectroscopy (EDS), respectively. Linear polarization tests were performed to analyze corrosion resistance. The optimal superhydrophobic performance was obtained with a contact angle of 154º for 30 min of acid etching. This condition also showed higher corrosion resistance, obtaining higher values of E corr and lower values of corrosion current density.

Materials Research, 2019

The mechanical behavior of the API 5L X80 steel exposed to the produced water by the petroleum in... more The mechanical behavior of the API 5L X80 steel exposed to the produced water by the petroleum industry, besides being dependent on the intrinsic properties of the steel, is influenced by the corrosivity characteristics of the electrolyte that may be associated with the presence of microorganisms. The objective of this work was to investigate the plastic deformation of API 5L X80 steel exposed to produced water. The tests were conducted in static systems (abiotic and biotic) containing produced water after 360 days. The process of corrosion of the coupons were evaluated by topographic 3D analysis and roughness, and the mechanical behavior by tensile test and fracture analysis by scanning electron microscopy. Surface topography and roughness were modified by the interaction of the consortium of microorganisms with the substrate associated with the corrosion process. The results indicate that microorganisms induced the formation of pits which caused the coupons to lose plasticity.

Anais do Congresso Internacional de Engenharia Mecânica e Industrial

Anais do Congresso Internacional de Engenharia Mecânica e Industrial, 2021

Anais do Congresso Internacional de Engenharia Mecânica e Industrial, 2021

Materials Science Forum, Aug 1, 2016

Aluminium alloy 7050 in a T7451 temper was friction-stir welded (FSW) to investigate the effects ... more Aluminium alloy 7050 in a T7451 temper was friction-stir welded (FSW) to investigate the effects of different process parameters on the microstructure and mechanical properties. Butt joints were obtained in 10mm thick-sheets, keeping a constant rotational speed of 550 rpm. Weld power and torque were recorded for each weld in order to obtain the heat input of the process, since the final properties of the welds are strongly related to this variable. The joints were characterized by optical microscopy and microhardness indentation through the stir zone (SZ), thermo-mechanically affected zone (TMAZ), and heat affected zone (HAZ) at different cross section heights. The processing of FSW, the microstructure in FSW alloys and the factors influencing weld quality are introduced.

Anais do Congresso Internacional de Engenharia Mecânica e Industrial, 2023

Anais do Congresso Internacional de Engenharia Mecânica e Industrial, 2023

Surface & Coatings Technology, Mar 1, 2023

Materials Research-ibero-american Journal of Materials, 2021

The use of nanocomposite coatings on carbon steel has been very promising. In this paper, the for... more The use of nanocomposite coatings on carbon steel has been very promising. In this paper, the formation mechanism of multilayer of Ni-Co/SiC nanocomposite coating electrodeposited in API 5L X80 steel was investigated. The coatings were obtained by galvanostatic deposition technique using a single bath and a single cathodic current density value. The results showed a variation in morphology and chemical composition of the coatings both on the surface and along the cross-section at all time conditions tested, confirming the functional gradient of the coating. The formation of the Ni-Co/SiC nanocomposite coating occurred through the multilayer deposition mechanism, with compositions mostly alternated between Ni and Co. The preferred orientation of the plane (220) and phase structure FCC remained constant on the surface of all the obtained samples. It was observed that the coating became more compact in the region located closer to the substrate, where an increase in micro-hardness was observed.

Impactos das Tecnologias na Engenharia de Materiais e Metalúrgica 2, 2021

Ciência e Engenharia de Materiais e o Desenvolvimento Socioambiental, 2019

Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atrib... more Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição 4.0 Internacional (CC BY 4.0). O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais.

ABM Proceedings, 2018

Nacional de Estudantes de Engenharia Metalúrgica, de Materiais e de Minas, parte integrante da AB... more Nacional de Estudantes de Engenharia Metalúrgica, de Materiais e de Minas, parte integrante da ABM Week, realizada de 17 a 21 de agosto de 2015, Rio de Janeiro, RJ, Brasil. EFEITOS DOS PROCESSOS DE CONFORMAÇÃO PLÁSTICA NAS PROPRIEDADES TERMOELÁSTICAS NUMA LIGA DE Ni-Ti COM MEMÓRIA DE FORMA* Cezar Henrique Gonzalez1 Niédson José da Silva2 Carlos Augusto do Nascimento Oliveira1 Oscar Olímpio de Araújo Filho1 Severino Leopoldino Urtiga Filho1 Luiz Carlos Sekitani da Silva3 Carlos José de Araújo4 Resumo Processos de conformação plástica têm sido aplicados nas ligas com memória de forma (LMF) para melhorar suas propriedades mecânicas. No entanto, estes processos provocam alterações das suas propriedades termoelásticas (temperaturas e entalpias de transformação, cargas críticas de indução da martensita, deformação termoelástica reversível e outras). Para aplicações tecnológicas destas ligas, por exemplo como atuadores termomecânicos, elas devem manter suas características constantes ao lo...

Materials Research, 2021

Biocorrosion is the main process that causes pipeline damages and losses in the oil industry. The... more Biocorrosion is the main process that causes pipeline damages and losses in the oil industry. The objective of this work was to investigate the influence of biofilm forming microorganisms on the biocorrosion of X80 steel exposed in produced water through microbiological characterization, film and biofilm analysis by optical microscopy and scanning electron microscopy, weight loss and surface analysis by laser confocal microscopy. Changes in produced water after 360 days were attributed to planktonic cells, temperature conditions, contact with air, photo-oxidation, biodegradation, and seasonality. The total aerobic bacteria presented sessile cell concentration of 7.39 x 10 4 CFU/cm 2 , while the other investigated groups showed lower concentrations. The micrography of the film showed salt crystals, whereas in the biofilm microorganisms, exopolysaccharides and corrosion products were observed. Weight loss after 360 days for the abiotic and biotic systems was 0.0222 g/cm 2 and 0.3039 g/cm 2 , respectively, showing that microorganisms accentuated the corrosion of X80 steel.

JOM, 2021

AISI 431 bead-on-plates were deposited on AISI 1010 by laser cladding, since it is a well-known c... more AISI 431 bead-on-plates were deposited on AISI 1010 by laser cladding, since it is a well-known corrosion-resistant material. The effects of laser power, scanning speed, powder feed rate and focal distance on the coatings’ geometry and dilution ratios, as well as microstructure evolution, iron dilution and microhardness of the beads were evaluated by optical and electron scanning microscopes, the last one coupled with x-ray energy dispersive spectroscopy, and microhardness test. The results showed that the clad height is mainly influenced by the scanning speed, while for the width, laser power, scanning speed and focal distance were crucial. Changing laser power has a more marked effect on the dilution than on the aspect ratio, while changing scanning speeds and focal distance shows a marked effect on both dilution and aspect ratio. The microstructure of coating zone is mainly composed by lath martensite. Furthermore, the average hardness by microindentation of the AISI 431 stainless steel cladding coating was about 5 times higher than that of the substrate.

Chemical Engineering and Processing - Process Intensification, 2021

Matéria (Rio de Janeiro), 2020

This work aims to evaluate the influence of welding parameters, current intensity and deposition ... more This work aims to evaluate the influence of welding parameters, current intensity and deposition speed, on the bead geometry, dilution, morphology and properties of a nickel-based alloy coating. For this, single beads of Inconel 625 alloy were deposited on the substrate of ASTM A36 Steel, by PTA-P process. The samples were sandblasted and polished. The samples were chemically etched by a solution of 92 mL HCl, 3 mL HNO 3 and 5 mL H 2 SO 4 for 5 minutes. The geometry of the beads (reinforcement height, bead width, penetration and contact angle) was measured through the digital stereoscope microscope. The microstructures of the cross sections were evaluated by optical microscopy and scanning electron microscopy (SEM), to identify the possible presence of precipitated phases in the ferrite matrix. The chemical composition of these present phases, as well as the diffused iron content from the substrate for the coating, were measured by EDX. The type of the phases precipitated by x-ray diffraction in the top samples of the coating were also evaluated, in 1.5 mm height of reinforcement. For mechanical property analysis, the microhardness of the coatings was measured by Vickers microhardness test to evaluate their relationship with the iron present in the coatings, which diffused from the substrate. The results confirmed the influence of welding parameters on coating dilution-Current is the parameter of greatest response. The morphologies of the coatings were presented as a γ matrix with second phase precipitation composed of Ni, Nb, Cr and Mo. The concentration of these precipitations decreased with increasing dilution. This occurred because of the increased migration of Fe present in the substrate of the coating through the diffusion phenomena, with increasing dilution. The Fe reduced the solubility of Nb and Mo of the γ matrix, causing the decrease of its hardness.

Matéria (Rio de Janeiro), 2020

RESUMO O presente trabalho teve como objetivo desenvolver e caracterizar revestimentos nanocompós... more RESUMO O presente trabalho teve como objetivo desenvolver e caracterizar revestimentos nanocompósitos de Ni e Ni-Grafeno aplicados em superfície de aço API 5L X80, utilizando o processo de eletrodeposição, para obter melhores propriedades anticorrosivas. Corpos de prova de dimensões de 20x20x3 mm foram submetidos à limpeza e preparação metalográfica, para posterior deposição dos revestimentos. Para o processo de eletrodeposição foi utilizado um banho à base de níquel contendo dodecil sulfato de sódio (SDS) como surfactante. Para obtenção dos revestimentos Ni-Grafeno, foram adicionadas partículas de grafeno (0,2g/L) ao banho eletrolítico. Os eletrodepósitos obtidos foram caracterizados por Difração de Raios-X (DRX) e Microscopia Eletrônica de Varredura (MEV). A resistência à corrosão dos revestimentos foi avaliada por meio de ensaios de Polarização Linear (PL) e Espectroscopia de Impedância Eletroquímica (EIE). A inserção de grafeno ao revestimento promoveu a formação de depósitos co...

Materials Research, 2019

This paper sets out to evaluate the corrosion of ASTM A131 grade A36 carbon steel exposed to a di... more This paper sets out to evaluate the corrosion of ASTM A131 grade A36 carbon steel exposed to a diesel oil S10 / saline water system and the biodegradation of diesel oil S10 to simulate storage, transport and fuel use systems during a period of 30 days. The corrosion process was investigated through electrochemical tests of Open Circuit Potential (OCP), Electrochemical Impedance Spectroscopy (EIS) and Linear Polarization (LP). The morphology of the corrosion products were analyzed by Scanning Electron Microscopy (SEM). The results showed that the presence of saline water in the system containing diesel oil is an aggravating factor which promotes the biodegradation of the fuel and, consequently, aggravates the corrosion process.

The International Journal of Advanced Manufacturing Technology, 2020

Hybrid laser-arc welding (HLAW) is a joining process that simultaneously combines arc and laser w... more Hybrid laser-arc welding (HLAW) is a joining process that simultaneously combines arc and laser welding in the same weld pool. The basic concept is to reduce the drawbacks and maximize the advantages of each individual welding process. In the present work, low-alloy steel NK: KD36 plates were welded by HLAW with the following thickness: 7, 9, 14, and 17 mm. The angular distortion and the transverse shrinkage caused by the process were investigated in the welded joint with different weld parameters. The laser-arc hybrid welding experiment was carried out using a 20-kW Yb: fiber laser, together with an arc welding machine (CO 2 arc welding). The laser axis was tilted to an angle of 10°, trailing with respect to the normal of the sample surface to avoid back reflections. The arc welding torch was inclined at an angle of 40°. The distance from the focus laser to arc torch was 5 mm. This investigation has shown that the hybrid laser-arc welding offers significant advantages compared with laser welding and arc welding. Compared with the conventional arc welding process, HLAW generates a lower transverse shrinkage and less weld pass for the same plate thickness. Although the coupling of the two processes leads to an increase in the number of parameters, it is the reason for the complexity of this process.

Materials Research, 2019

This paper aimed to develop and characterize superhydrophobic surfaces with anticorrosive propert... more This paper aimed to develop and characterize superhydrophobic surfaces with anticorrosive properties obtained by the chemical modification of the 5052 aluminum alloy with variation of acid etching time, formation of lamellar double hydroxides (LDH) film and immersion in stearic acid. The specimens were etched in HCl (2M) at 5, 10 and 30 min. The aluminum plates were treated with aqueous solution of zinc nitrate (0.1 M) in the presence of ammonia and then immersed in a stearic acid and ethanol solution (1% w/w) to reduce surface energy. Contact angles (CA) were determined. Surface morphology and composition were analyzed by scanning electron microscopy (SEM) and X-ray energy dispersion spectroscopy (EDS), respectively. Linear polarization tests were performed to analyze corrosion resistance. The optimal superhydrophobic performance was obtained with a contact angle of 154º for 30 min of acid etching. This condition also showed higher corrosion resistance, obtaining higher values of E corr and lower values of corrosion current density.

Materials Research, 2019

The mechanical behavior of the API 5L X80 steel exposed to the produced water by the petroleum in... more The mechanical behavior of the API 5L X80 steel exposed to the produced water by the petroleum industry, besides being dependent on the intrinsic properties of the steel, is influenced by the corrosivity characteristics of the electrolyte that may be associated with the presence of microorganisms. The objective of this work was to investigate the plastic deformation of API 5L X80 steel exposed to produced water. The tests were conducted in static systems (abiotic and biotic) containing produced water after 360 days. The process of corrosion of the coupons were evaluated by topographic 3D analysis and roughness, and the mechanical behavior by tensile test and fracture analysis by scanning electron microscopy. Surface topography and roughness were modified by the interaction of the consortium of microorganisms with the substrate associated with the corrosion process. The results indicate that microorganisms induced the formation of pits which caused the coupons to lose plasticity.