Rajendran, S. and Apparao, B.V. and Palaniswamy, N. and Periasamy, V. and Karthikeyan, G. (2001) Corrosion inhibition by stainless complexes. Corrosion Science, 43 (7). pp. 1345-1354. ISSN 0010-938X

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Abstract

Introduction of a methylene group in the Carbon chain of carboxymethyl phosphonic acid (CMPA) results in 2-carboxyethyl phosphonic acid (2-CEPA). The inhibition efficiency(IE) of these two phosphonic acids, in the absence and presence of Zn2+, in controlling corrosion of carbon steel immersed in a neutral acqeous environment, containing 60 ppm Cl- has been evaluated by weight loss method. The IEs are measured as a function of immersed period and compared. The protective film has been analysed X-ray diffraction, Fourier transform infrared and luminescence spectra. A suitable mechanism of corrosion inhibition is proposed based on the results of weight loss study and various surface analysis techniques. The 2-CEPA-Zn2+ is found to offer better IE than the CEPA-Zn2+ system. This is due to the facts. (i) 2-CEPA keeps Zn+ in a more solubilised form , (ii) large size of Fe2+-2-CEPA complex, which is more relaxed, stainless and more stable than Fe2+ -CMPA complex. The protective film is found to consist of Fe2+-phosphonate complex and Zn(OH)2; it is found to be luminescent.

Item Type:	Article
Uncontrolled Keywords:	Carboxymethyl phosphonic acid; 2-Carboxyethyl phosphonic acid; Corrosion inhibitors; Carbon steel; Structure-inhibition correlation
Subjects:	Corrosion Science and Engineering
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	06 Apr 2012 15:48
Last Modified:	06 Apr 2012 15:48
URI:	http://cecri.csircentral.net/id/eprint/1087

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