Inhibition of corrosion of carbon steel by heptane sulphonic acid – Zn 2+ system (original) (raw)
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Surface Protection of Carbon Steel by Hexanesulphonic Acid-Zinc Ion System
ISRN Corrosion, 2014
Inhibition of corrosion of carbon steel in dam water by hexanesulphonic acid as its sodium salt C6H13SO3Na (SHXS) in the absence and presence of a bivalent cation zinc ion (Zn2þ) has been investigated using weight loss method. Results of weight loss method indicate that inhibition efficiency (IE) increased with increase of inhibitor concentration. Polarization study reveals that SHXS-Zn2+system controls the cathodic reaction predominantly. AC impedance spectra reveal that a protective film is formed on the metal surface. The nature of the metal surface has been analysed by Fourier Transform Infrared Spectroscopy (FTIR) and Atomic Force Microscopy (AFM).
Corrosion Inhibition by an Ion Pair Reagent-Zn2+ System
benthamscience.com
Inhibition of corrosion of carbon steel in dam water (Tamil Nadu, India) by Pentane sulphonicacid as its sodium salt (SPS)-Zinc ion system has been studied using weight-loss and potentiodynamic polarization methods. Results of weight loss method indicated that inhibition efficiency (IE) increased with increasing inhibitor concentration. Polarization study reveals that SPS-Zn 2+ system functions as a cathodic inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. The nature of protective film formed on the metal surface has been analysed by FTIR spectra and AFM analysis. From the results of above studies a suitable mechanism for corrosion inhibition is proposed.
Mutual Influence of HEDP and SDS -Zn 2+ System on Corrosion Inhibition of Carbon Steel
Rain water running down from the terrace was stored in concrete tanks and used for the study. The inhibition efficiency (IE) of sodium dodecyl sulphate (SDS) in controlling corrosion of carbon steel immersed in rain water in the presence of Zn 2+ and 1-hydroxyethane-1,1-diphosphonic acid (HEDP) has been evaluated by weight loss method. SDS accelerates the corrosion rate. SDS-Zn 2+ system also accelerates the corrosion rate. Interestingly the SDS-Zn 2+ -HEDP system shows excellent IE. The SDS (150 ppm) -Zn 2+ (50 ppm) system is corrosive. When 50 ppm HEDP is added the IE becomes 80% The HEDP (100 ppm) -Zn 2+ (50 ppm) system has only 65% IE. When 100 ppm of SDS is added, IE increases to 93%. The protective film consists of Fe 2+ -SDS complex, Fe 2+ -HEDP complex and Zn(OH) 2 as revealed by FTIR spectra. The HEDP-Zn 2+ system shows good IE. The protective film consists of Fe 2+ -HEDP complex and Zn(OH) 2 . Rain water along with these formulations may be used in cooling water systems in...
Anti-Corrosion Methods and Materials, 2005
Purpose -The aim of the present work was to study the synergistic effect of HEDP and zinc on inhibition of the corrosion of carbon steel in neutral oxygen-containing chloride solutions, and to investigate the effect of zinc-HEDP molar ratio on the effectiveness of the zinc-HEDP inhibitive mixtures. Design/methodology/approach -The inhibition of the corrosion of carbon steel by zinc-HEDP mixtures in neutral oxygen-containing solutions was investigated in the presence of 0.003 M (106 ppm) chloride. Findings -It was shown that the inhibition by these mixtures depended not only on the zinc/HEDP molar ratio but also on the concentration of both zinc and HEDP. HEDP concentration appeared to be crucial where good inhibition was not achieved at low concentrations and aggressive nature is observed at high HEDP levels. The effectiveness of the zinc-HEDP mixtures enhanced inhibition by increasing the zinc content of the mixture, but the mechanism was only effective to a certain level, above which the inhibition effect declined. The predominant corrosion control mechanism of the zinc-HEDP mixture was on the anodic (metal dissolution) reaction, but it also affected the rate and mechanism of the oxygen reduction reaction. Originality/value -Demonstrates how the effectiveness of the zinc-HEDP mixtures can enhance inhibition by increasing the zinc content of the mixture.
Anti-Corrosion Methods and Materials, 2005
Purpose -The aim of the present work was to study the synergistic effect of HEDP and zinc on inhibition of the corrosion of carbon steel in neutral oxygen-containing chloride solutions, and to investigate the effect of zinc-HEDP molar ratio on the effectiveness of the zinc-HEDP inhibitive mixtures. Design/methodology/approach -The inhibition of the corrosion of carbon steel by zinc-HEDP mixtures in neutral oxygen-containing solutions was investigated in the presence of 0.003 M (106 ppm) chloride. Findings -It was shown that the inhibition by these mixtures depended not only on the zinc/HEDP molar ratio but also on the concentration of both zinc and HEDP. HEDP concentration appeared to be crucial where good inhibition was not achieved at low concentrations and aggressive nature is observed at high HEDP levels. The effectiveness of the zinc-HEDP mixtures enhanced inhibition by increasing the zinc content of the mixture, but the mechanism was only effective to a certain level, above which the inhibition effect declined. The predominant corrosion control mechanism of the zinc-HEDP mixture was on the anodic (metal dissolution) reaction, but it also affected the rate and mechanism of the oxygen reduction reaction. Originality/value -Demonstrates how the effectiveness of the zinc-HEDP mixtures can enhance inhibition by increasing the zinc content of the mixture.
Inhibition of Corrosion of Carbon Steel in Sea Water by Sodium Gluconate - Zn2+ System
Portugaliae Electrochimica Acta, 2013
The inhibition efficiency of sodium gluconate (SG)-Zn 2+ system in controlling corrosion of carbon steel in sea water has been evaluated by weight-loss method. The formulation consisting of 250 ppm of SG and 75 ppm of Zn 2+ has 98% IE. Influence of duration of immersion on the IE of SG-Zn 2+ has been evaluated. The mechanistic aspects of corrosion inhibition have been investigated by polarization study and AC impedance spectra. The protective film has been analysed by FTIR and luminescence spectra. The surface morphology and the roughness of the metal surface have been analysed by atomic force microscopy. The protective film consists of Fe 2+-SG complex and Zn(OH) 2. It is found to be UV-fluorescent.
European Chemical Bulletin, 2013
The corrosion inhibition efficiency of Isonicotinamide (ISN) in controlling the corrosion of carbon steel in one normal(1N) hydrochloric acid solution(HCl) in absence and presence of Zn 2+ has been studied by weight loss method. Weight Loss study reveals that the formulation consisting of 10 ppm of ISN and 10 ppm of Zn 2+ has 78% inhibition efficiency. The results of polarisation study shows that the formulation function controls the anodic reaction predominantly. The AC impedance spectra reveal that a protective film formed on the metal surface. FTIR spectrum reveal that the protective film consists of Fe 2+ -ISN complex on the anodic sites of metal surface and Zn(OH) 2 formed on cathodic sites of metal surface.
Corrosion, 2004
This paper presents an electrochemical study of the effect of calcium salts on the corrosion inhibition of mild steel by zinc-1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) mixtures and compares the effect of calcium and zinc additions on the effectiveness of HEDP. The results are considered in terms of the nature, concentration, and stability of the solution species present, especially the metal-HEDP complex anions. Calcium addition showed some inhibition for the corrosion of mild steel, but it is much lower than for zinc. This is associated with the low stability of calcium complexes compared with ferrous complexes, which facilitates the displacement of calcium ions from their complexes by ferrous ions forming soluble, unprotective, ferrous complexes. The zinc-HEDP mixtures give effective inhibition at a zinc:HEDP molar ratio of 2:1 and are attributed to anodic inhibition by the 2:1 complex anion, Zn 2 H -1 L -. This inhibition is signifi cantly affected by the presence of suffi cient-free phosphonate, which is considered an aggressive anion. However, the presence of free phosphonate is not detrimental if calcium is present in the solution. Both work together to eliminate the negative effect of free phosphonate and the hardness salt, the presence of which could affect the performance of zinc-HEDP mixtures or contribute to scaling problems.
Rasayan Journal of Chemistry, 2019
The inhibition of corrosion of Sodium Dodecyl Sulphate and the synergistic effect with Zn 2+ taking place on the surface of carbon steel in well water medium were studied using mass reduction technique, cyclic voltammetry (CV), Atomic Force Microscopy (AFM), FTIR and Contact Angle measurement. The effects showed that there is a protective layer formed on the surface of carbon steel and also that the protective layer is stable even in presence of 3.5% sodium chloride solution. This confirms that there was a formation of self-assembled monolayer on the surface of the carbon steel and there was a synergistic effect occurs among Zn 2+ and Sodium Dodecyl Sulphate.
Corrosion inhibition of carbon steel by adipic acid - Zn2+ system
Indian Journal of Chemical Technology, 2005
The inhibition efficiency (IE) of adipic acid (AA)-Zn 2+ system in controlling corrosion of carbon steel immersed in well water has been evaluated by weight-loss method. The formulation consisting of 50 ppm of AA and 50 ppm of Zn 2+ has 95% IE. At lower pH value(pH=6) IE decreases and in alkaline medium (pH=8) IE increases. Polarization study reveals that AA-Zn 2+ system functions as a mixed inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. FTIR spectra reveal that the protective film consists of Fe 2+-AA complex and Zn(OH) 2 .