MIGRATION OF I~- INTO CRACKS AND ITS EFFECTS ON OCCLUDED CELL CORROSION

J Chin Soc Corr Pro

1992, Vol. 12

Issue (4): 365-370 DOI:

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MIGRATION OF I~- INTO CRACKS AND ITS EFFECTS ON OCCLUDED CELL CORROSION

Liu Youping; Zhou Ming; Zuo Jingyi and Jin Zhiqiang(Beijing Institute of Chemical Technology)

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Abstract Simulated occluded cell(0C) was used to study the chemical and electrochemical changes within stress corrosion cracks for the system sensitized AISI304 steel/Cl~- with addition of different concentrations of I~-. The respective number of equivalents of migrated I~- as well as Cl~- was proportional to the quantity of electricity passing through the occluded cell. The ratio of migration rate of Cl~-/I~- was the same as that of the concentrations of those ions in bulk solution. The pH value inside occluded cell was independent of I~- migration, but the occcluded potential moved more positively than that without I~-. It was shown by potentiostatie weight loss method using simulated occluded solutions with different I~- concentrations that the migation of I~- from outside inhibited the occluded cell corrosion. The inhibition efficiency of 0C was more than 98％ when the concentration of I~- in bulk solution was only 0.01mol/L. So the iodide was an effective inhibitor of stress corrosion cracking for austenitic stainless steel in chloride solutions.

Received: 25 August 1992

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Liu Youping; Zhou Ming; Zuo Jingyi and Jin Zhiqiang(Beijing Institute of Chemical Technology). MIGRATION OF I~- INTO CRACKS AND ITS EFFECTS ON OCCLUDED CELL CORROSION. J Chin Soc Corr Pro, 1992, 12(4): 365-370.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1992/V12/I4/365

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