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http://dx.doi.org/10.5916/jkosme.2009.33.8.1162

Electrochemical Evaluation on Corrosion Property of Welding Zone of 22APU Stainless Steel  

Moon, Kyung-Man (한국해양대학교 공과대학 조선기자재 공학부)
Kim, Yun-Hae (한국해양대학교 공과대학 조선기자재 공학부)
Lee, Sung-Yul (한국해양대학교 공과대학 조선기자재 공학부)
Kim, Jong-Do (한국해양대학교 해사대학 기관시스탬공학부)
Lee, Myung-Hoon (한국해양대학교 해사대학 기관시스탬공학부)
Kim, Jin-Gyeong (한국해양수산연수원 교육연구처)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.33, no.8, 2009 , pp. 1162-1169 More about this Journal
Abstract
Two kinds of welding methods were carried out for 22APU stainless steel, one is a Laser welding and the other is the TIG welding. In this case, difference of corrosion characteristics of welded zone with two welding methods mentioned above was investigated with electrochemical methods such as measurement of corrosion potential, polarization curves and cyclic voltammogram etc.. Vickers hardness of all welded zone (WM:Weld Metal, HAZ:Heat Affected Zone, BM:Base Metal)in the case of Laser welding showed a relatively higher value than those of TIG welding. Futhermore their corrosion current density in all welding zone were also observed with a lower value compared to TIG welding. In particular corrosion current density of BM regardless of welding method indicated the lowest value than those of other welding zone. Intergranular corrosion was not observed at the corroded surface of all welding zone in the case of Laser welding, however it was observed at WM and HAZ with TIG welding, which is suggested that chromiun depletion due to forming of chromium carbide appears to WM and HAZ which is in the range of sensitization temperature. Therefore their zone can easily be corroded with more active anode. Consequently we can see that corrosion resistance of all welding zone of 22APU stainless steel can apparently be improved by using of Laser welding.
Keywords
Laser welding; TIG welding; Corrosion potential; Weld metal; Heat affected zone; Polarization curves; Chromium depletion;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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