Phosphonates have shown synergistic effects in combination with Zn2+ ions in controlling the corrosion of carbon steel immersed in neutral aqueous environments containing 60‐ppm Cl‐. The role of phosphonates in the presence of Zn2+ ions has been investigated by polarisation tests and weight loss results. It was observed that the phosphonates functioned as transporters of Zn2+ ions from the bulk of the solution towards the metal surface. The phosphonate‐Zn2+ bond is sufficiently strong to carry Zn2+ ions from the bulk solution towards the metal surface, but is weak enough for them to break to form a phosphonate‐Fe2+ bond at anodic sites on the metal surface. Inhibition efficiency increases when the phosphonate‐Zn2+ complex remains in solution in soluble form. Inhibition efficiency decreased when the phosphonate‐Zn2+ complex was precipitated in the bulk of the solution.
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Research Article|
June 01 2002
The role of phosphonates as transporters of Zn2+ ions in the inhibition of carbon steel in neutral solutions containing chlorides
S. Rajendran;
S. Rajendran
Department of Chemistry, G.T.N. Arts College (Autonomous), Dindigul, Tamilnadu, India
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B.V. Apparao;
B.V. Apparao
Department of Chemistry, Regional Engineering College, Warangal, Andhrapradesh, India
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N. Palaniswamy;
N. Palaniswamy
Corrosion and Engineering Division, Central Electrochemical Research Institute, Karaikudi, Tamilnadu, India
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A.J. Amalraj;
A.J. Amalraj
Department of Chemistry, Gandhigram University, Tamilnadu, India
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M. Sundaravadivelu
M. Sundaravadivelu
Department of Chemistry, Gandhigram University, Tamilnadu, India
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Publisher: Emerald Publishing
Online ISSN: 1758-4221
Print ISSN: 0003-5599
© MCB UP Limited
2002
Anti-Corrosion Methods and Materials (2002) 49 (3): 205–209.
Citation
Rajendran S, Apparao B, Palaniswamy N, Amalraj A, Sundaravadivelu M (2002), "The role of phosphonates as transporters of Zn2+ ions in the inhibition of carbon steel in neutral solutions containing chlorides". Anti-Corrosion Methods and Materials, Vol. 49 No. 3 pp. 205–209, doi: https://doi.org/10.1108/00035590210426472
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