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A Study on the Initiation of Pitting Corrosion of Fe-17Cr Alloy Using Micro-Droplet Cell Technique  

Kim, Jae-Jung (School of Advanced Materials Engineering, Kookmin University)
Lee, Jae-Bong (School of Advanced Materials Engineering, Kookmin University)
Publication Information
Korean Journal of Metals and Materials / v.46, no.12, 2008 , pp. 809-816 More about this Journal
Abstract
The influences of various parameters such as inclusions, surface roughness, exposed areas and chloride ion concentrations on the initiation of pitting of Fe-17Cr alloy were investigated, using micro-droplet cell technique. Micro-droplet cell allows one to align the micro-electrode to the desired spot of the working electrode and measure directly local currents with the potentiodynamic polarization. Micro electrochemical tests were carried out at the inclusions after EDX analysis of inclusion. EDX analysis identified inclusions as Cr-oxides. It was found that some active inclusions among Cr-oxide inclusions acted as initiation sites for pitting corrosion. In addition, the rougher surface and the denser chloride ion concentration offered easier pit initiation sites, causing the more susceptible to pitting corrosion.
Keywords
micro potentiodynamic polarization; micro-droplet cell; pitting corrosion; inclusion; surface roughness; chloride ion concentration;
Citations & Related Records
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Times Cited By Web Of Science : 2  (Related Records In Web of Science)
Times Cited By SCOPUS : 3
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