corrosion inhibition by sodium gluconate-zn2+-dtpmp system
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ID: 240478
2009
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Abstract
The inhibition efficiency of a phosphonic acid, Diethylene Triamine Pentamethylene Phosphonic acid (DTPMP) in controlling corrosion of carbon steel immersed in an aqueous solution containing 60 ppm of Cl- has been evaluated by weight loss method in the absence and presence of Zn2+. The formulation consisting of DTPMP and Zn2+ has excellent inhibition efficiency (IE). A synergistic effect is noticed between Zn2+ and DTPMP. Addition of sodium gluconate (SG) enhances the IE of Zn2+ and DTPMP system. The DTPMP-Zn2+-SG system function as a mixed inhibitor as revealed by polarization study. AC impedance spectrum, optical and atomic force micrographs reveal the formation of a protective film on the metal surface. FTIR spectra reveal that the protective film consists of Fe2+-DTPMP complex, Fe2+-SG complex and Zn(OH)2.
| Reference Key |
manjula2009e-journalcorrosion
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|---|---|
| Authors | ;P. Manjula |
| Journal | Journal of pharmaceutical and biomedical analysis |
| Year | 2009 |
| DOI |
10.1155/2009/859218
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