2004, Vol. 24

Issue (3): 174-178 DOI:

Research Report

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Jingmao Zhao

北京化工大学材料科学与工程学院23信箱

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Abstract The effects of molybdate,phosphate and dichromate anions on pit propagation of mild steel in aHCO3-NaCl solution were investigated by electrochemical measurements.MoO2-4 and PO3-4 ions suppressed both pit ucleation and propagation.Cr2O2-7 ion suppressed pit nucleation,but stimulated pit growth.The further study showed that the different effects of the three anions on pit propagation could be explained by their effects on pH value within pits.The pH value increased after adding molybdate or phosphate in the pit simulated solution as a result of polymerization of MoO2-4 or the hydrolysis of PO3-4,while pH value decreased after adding dichromate anions due to hydrolysis of Fe3+and Cr3+ which were the produ cts of oxide-reducing reactions between Cr2O2-7 and Fe2+ions.

Key words: anions corriosion inhibitior pitting corrosion carbon steel NaHCO3-NaCl solution

Received: 08 October 2002

ZTFLH:

TG174.42

Corresponding Authors: Jingmao Zhao E-mail: jingmaozhao@sohu.com

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Cite this article:

Jingmao Zhao. . J Chin Soc Corr Pro, 2004, 24(3): 174-178 .

URL:

https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2004/V24/I3/174

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