Journal
CORROSION SCIENCE
Volume 51, Issue 8, Pages 1671-1674Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2009.04.015
Keywords
Steel; Electrochemical noise; XPS; Neutral inhibition
Funding
- Petrochemical Research & Technology Company (NPC-RT) of Iran
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A variety of approaches have been proposed to achieve an enhancement regarding inhibitive performance of zinc phosphate (ZP) anticorrosion pigment. This work attempts to study behavior of zinc aluminum polyphosphate (ZAPP) representing modified zinc phosphate pigment through electrochemical techniques along with surface analysis. Analysis of the data obtained from electrochemical noise method revealed superiority of ZAPP compared to ZP. The amplitude of the current noise fluctuation and trend of noise resistance variation as well as shot noise theory suggested precipitation of a protective layer in the presence of ZAPP, restricting access of the aggressive species to the steel surface. X-ray photoelectron spectroscopy (XPS) was employed to analyze the sample surface exposed to 3.5% NaCl solution containing modified pigment extract. (C) 2009 Elsevier Ltd. All rights reserved.
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