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Author Rajendran, S. ♦ Joany, R. M. ♦ Apparao, B. V. ♦ Palaniswamy, N.
Source CSIR-Central Electrochemical Research Institute
Content type Text
Publisher Central Electrochemical Research Institute
File Format PDF
Copyright Year ©2002
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations
Subject Keyword Corrosion Science and Engineering
Abstract Influence of carboxymethyl cellulose (CMC) on the inhibition efficiency of 1-hydroxyethanole-1,1-diphosphonic acid (HEDP)- Zn2+ system in controlling corrosion of mild steel immersed in a neutral aqueous environment containing 60 ppm Cl- has been evaluated by weight loss study. The formulation consisting of 10 ppm Zn2+ and 300 ppm HEDP has 40% inhibition efficiency (IE). Addition of 10 ppm CMC improves the IE from 40% to 50%, addition of 50 ppm CMC improves the IE to 80%. Further, addition of CMC (= 700 ppm) lowers the IE, since the resistance to the rate of diffusion of the inhibitors from the bulk of the solution towards the metal surface increases. The protective film has been analyzed by X ray diffraction (XRD) and FTIR. The protective film consists of Fe2+ - HEDP complex, Fe2+ - CMC complex and Zn(OH)2. A suitable mechanism of corrosion inhibition is proposed based on the results obtained from polarization study, XRD and FTIR spectra
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2002-01-01
Journal PeerReviewed