Comparative study on the corrosion and mechanical properties of nano-composite coatings incorporated with TiO 2 nano-particles, TiO 2 nano-tubes, and ZnO nano-flowers (original) (raw)
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Study of TiO2 nanoparticle coatings by the sol-gel method for corrosion protection
Materials Science, 2008
We describe an economical method of deposition of Ti O 2 coatings. The sol composition used for the deposition of nanocoatings is optimized, and the relationship between its pH value, water content, and the time of structurization is established. The potentiodynamic polarization, optical microscopy, and scanning electron microscopy are used for the evaluation of the corrosion resistance of specimens with coatings. The best protective properties are exhibited by the coatings obtained for a dip-coating rate of the specimen of 9 mm/sec, a period of drying of 3 h, and a rate of heating in the process of thermal treatment of 1°C / min, as well as after three consecutive procedures of dip coating.
2019
In this paper, we are interested in the study of electrochemical, morphological and structural characteristics of the properties of the deposits of Zn-Ni-TiO2 obtained by electrodeposition on the mild steel substrate in a bath of sulfate. The principal aim is to improve the coatings with better properties, by incorporation of titanium oxide, which is a hard compound, chemically stable and irreducible. The characterization of the coatings was carried out by scanning electron microscopy (SEM) and by X-ray diffraction. The morphology of the film surface varies with the concentration of oxide titanium and it was found higher values of microhardness. Electrochemical characterization of the composites had been carried out through potentiodynamic polarization. The results showed that better corrosion resistance with the incorporation of oxide titanium.
IOP Conference Series: Materials Science and Engineering, 2012
Coatings have been widely used in engineering and decoration to protect components and products and enhance their life span. Nickel (Ni) is one of the most important hard coatings. Improvement in its tribological and mechanical properties would greatly enhance its use in industry. Nanocomposite coatings of metals with various reinforced nanoparticles have been developed in last few decades. Titania (TiO 2 ) exhibit excellent mechanical properties. It is believed that TiO 2 incorporation in Ni matrix will improve the properties of Ni coatings significantly. The main purpose of the current work is to investigate the mechanical and anti-corrosion properties of the electroplated nickel nanocomposite with a small percentage of TiO 2 . The surface morphology of nanocomposite coating was characterized by scanning electron microscopy (SEM). The hardness of the nanocoating was carried out using micromaterials nanoplatform. The sliding wear rate of the coating at room temperature in dry condition was assessed by a reciprocating ball-on-disk computer-controlled oscillating tribotester. The results showed the nanocomposite coatings have a smoother and more compact surface than the pure Ni layer and have higher hardness and lower wear rate than the pure Ni coating. The anti-corrosion property of nanocomposite coating was carried out in 3.5% NaCl and high concentrated 35% NaCl solution, respectively. The results also showed that the nanocomposite coating improves the corrosion resistance significantly. This present work reveals that incorporation of TiO 2 in nickel nanocomposite coating can achieve improved corrosion resistance and mechanical properties of both hardness and wear resistance performances, and the improvement becomes stronger as the content of TiO 2 is increased.
Revista De Metalurgia, 2021
The current study is conducted to develop an optimized corrosion resistant method. Low carbon steel (A-36) is used with five d ifferent c oatings a long w ith a n u ncoated s ample, t o c haracterize t he b ehavior against corrosion. Specimens are coated with red oxide primer, oil paint, and oil paint-primer. Coatings are also made by mixing nanoparticles of titanium oxide (TiO 2) and zinc oxide (ZnO) with oil paint. One molar nitric acid (HNO 3) solution is used to produce acidic medium, one molar sodium hydro-oxide (NaOH) solution is used to make basic medium and distilled water is used as a neutral medium. The linear polarization resistance (LPR) technique is used to determine the corrosion rate of different coatings in all conditions. In the acidic environment, the bare sample gives maximum corrosion of 191.5 mpy. The corrosion rate is decreased when coated with primer and paint respectively. But the minimum value of 0.302 mpy is observed in zinc oxide nanoparticles based coatings. In basic medium corrosion rate is observed to be low in bare and all types of coatings compared to the acidic environment. It shows that mild steel produces less metal oxides in a basic environment. The corrosion rate trend in the basic medium is the same having maximum in the bare sample (i.e. 0.1044 mpy) while minimum in zinc oxide-based coating (i.e. 0.000261). In distilled water, the bare sample gives maximum corrosion rate of 12.98 mpy as expected. Comparing three environments, acidic medium gives the highest corrosion rate in bare samples and in all coatings. Hence proper attention should be given when mild steel is being used in an acidic environment. The maximum corrosion rate is observed in bare samples while minimum in specimen coated with zinc oxide-based coatings. Hence it can be concluded that for better corrosion resistance, a coating made by mixing paint with zinc oxide nanoparticles should be used that works in all environments. Current study can be considered as easy to use solution for corrosion prevention in different corrosive environments.
Electrodeposited Zn–TiO2 nanocomposite coatings and their corrosion behavior
Journal of Applied Electrochemistry, 2010
The present paper aims to investigate the electrodeposition on steel substrate and the corrosion behavior of Zn-TiO 2 nanocomposite coatings. Zn-TiO 2 composite coatings were electrodeposited on OL 37 steel from an electrolyte containing ZnCl 2 , KCl, HBO 3 (pH 5.7) brightening agents and dispersed nanosized TiO 2 . Corrosion measurements were performed in 0.2 g L -1 (NH 4 ) 2 SO 4 solution (pH 3) by using electrochemical methods (open-circuit potential measurements, polarization curves, electrochemical impedance spectroscopy). The results of electrochemical measurements were corroborated with those obtained by using non-electrochemical methods (X-ray diffraction, atomic force microscopy and scanning electron microscopy). The results indicate that the composite coatings exhibit higher corrosion resistance as compared to pure Zn coatings and a non-linear dependence of their polarization resistance on TiO 2 concentration in the plating bath was found. The importance of TiO 2 nature and concentration regarding the properties of the composite coatings was demonstrated.
Studia Universitatis Babeș-Bolyai. Chemia
Composite Zn-Ni coatings incorporating TiO2 nanoparticles were obtained by electrodeposition on steel from alkaline solution containing triethanolamine (TEA) as complexing agent for Ni2+ and polyethyleneglicol (PEG) in combination with vanillin, as leveling/brightening agents. The influence of TiO2 nanoparticles on phase composition and structure of Zn-Ni coatings were investigated by X-ray diffraction and SEM-EDAX methods. By using polarization measurements, the corrosion behaviour of the nanocomposite coatings was examined and the corrosion process on Zn-Ni-TiO2 composite coatings was found to be slower than on pure Zn-Ni surface.
Journal of The Electrochemical Society, 2012
Nanocomposite metallic coatings containing various reinforced nanoparticles to improve their tribological and mechanical properties enhance and improve their use in industry and have been developed in last few decades. The main purpose of the current work is to investigate mechanical and anti-corrosion properties of the electroplated nickel nanocomposite with a small percentage of titania nanoparticles. The surface morphology, hardness, wear and corrosion resistance were investigated in detail. The results showed the nanocomposite coatings have a smoother and more compact surface than the pure nickel layer, and have higher hardness and lower wear rate than the pure Ni coating. The preferred orientation of the nanocomposite coating changes from (200) crystal plane to (220) plane. The anti-corrosion property of nanocomposite coating was carried out in 3.5 % and 35 % NaCl solution, respectively. The results also showed that the nanocomposite coating improves the corrosion resistance significantly. This present work reveals that incorporation of titania nanoparticles in nickel nanocomposite coating can achieve much improved corrosion resistance and mechanical properties of both hardness and wear resistance performances, and the improvement becomes stronger as the content of titania is increased.
2008
The present paper aims to investigate the electrodeposition on steel substrate and the corrosion behavior of Zn-TiO 2 nanocomposite coatings. Zn-TiO 2 composite coatings were electrodeposited on OL 37 steel from an electrolyte containing ZnCl 2 , KCl, HBO 3 (pH 5.7) brightening agents and dispersed nanosized TiO 2 . Corrosion measurements were performed in 0.2 g L -1 (NH 4 ) 2 SO 4 solution (pH 3) by using electrochemical methods (open-circuit potential measurements, polarization curves, electrochemical impedance spectroscopy). The results of electrochemical measurements were corroborated with those obtained by using non-electrochemical methods (X-ray diffraction, atomic force microscopy and scanning electron microscopy). The results indicate that the composite coatings exhibit higher corrosion resistance as compared to pure Zn coatings and a non-linear dependence of their polarization resistance on TiO 2 concentration in the plating bath was found. The importance of TiO 2 nature and concentration regarding the properties of the composite coatings was demonstrated.