The role of phosphonates as transporters of Zn2+ ions in the inhibition of carbon steel in neutral solutions containing chlorides
Author:
Rajendran S.,Apparao B.V.,Palaniswamy N.,Amalraj A.J.,Sundaravadivelu M.
Abstract
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.
Subject
General Materials Science,General Chemical Engineering
Reference12 articles.
1. Chiesa, W., Cigna, R., Di Simone, I.S., Gusmano, G. and Mazzani, G.F. (1985), Proc. 6th Europ. Symp. Corrosion Inhibitors, University of Ferrara, Italy, Vol. 2, p. 1295. 2. Dupart, M., Lafont, M.C. and Dabosi, F. (1985), Electrochimica Acta, Vol. 30 No. 3, p. 961. 3. Fang, J.L., Li, Y., Ye, X.R., Wang, Z.W. and Liu, Q. (1993), Corrosion, Vol. 49 No. 4, p. 266. 4. Felhosi, I., Keresztes, Zs., Karman, F.H., Mohai, M., Bertoti, I. and Kalman, E. (1999), J. Electrochem. Soc., Vol. 146 No. 3, p. 961. 5. Gonzalez, Y., Lafont, M.C. and Pebere, N. (1996), J. Applied Electrochem., Vol. 26, p. 1259.
Cited by
16 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|