Chemical Changes Within Occluded Cell for Localized Corrosion of Iron Artifacts in Chloride Solution

J Chin Soc Corr Pro

2004, Vol. 24

Issue (6): 364-367 DOI:

Research Report

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Chemical Changes Within Occluded Cell for Localized Corrosion of Iron Artifacts in Chloride Solution

北京化工大学材料科学与工程学院

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Abstract The changes of chemical state for localized corrosion of iron artifacts in 3.5% NaCl solution were studied within a simulated occluded cell. As anodic currents passed the cell a series of changes took place, the most important ones were pH fall and Cl- migration within the occluded cell. It was found that as anodic currents passing the cell, the pH value fell quickly at the beginning while slowly after it about 5, which was proportional to the logarithm of quantity of passing electricity. Meanwhile the Cl- migrated into occluded cell. The quantity of Cl- migration and enrichment multiples increased with the time of current flowing. As a rule, a linear relationship existed between the amount of Cl- migration and quantity of electricity passing. Consequently, Cl- concentration was a function of pH in occluded cell.

Key words: iron artifacts occluded cell localized corrosion

Received: 30 June 2003

ZTFLH:

TG172.5

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. Chemical Changes Within Occluded Cell for Localized Corrosion of Iron Artifacts in Chloride Solution. J Chin Soc Corr Pro, 2004, 24(6): 364-367 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2004/V24/I6/364

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