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http://dx.doi.org/10.5916/jkosme.2010.34.5.678

An Electrochemical Evaluation on Corrosion Properties of Welding Zone of Stainless Steel by GTAW  

Moon, Kyung-Man (한국해양대학교 공과대학 조선기자재공학부)
Lee, Kyu-Hwan (한국해양수산연수원 운항훈련처)
Kim, Jin-Gyeong (한국해양수산연수원 교육연구처)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.34, no.5, 2010 , pp. 678-685 More about this Journal
Abstract
GTAW was carried out to the austenitic 304(STS 304) and 22 APU stainless steels. In this case, difference of the corrosion characteristics of welded zone with STS 304 and 22APU mentioned above was investigated with electrochemical methods. Vickers hardness of weld metal in case of STS 304 (Hv-250) showed a relatively higher value than this of 22 APU(Hv-217). The corrosion current densities of weld metal of 22APU and heat affected zone of STS 304 were observed at the highest value compared to those of other welding zone respectively. This is probably because chromium depletion field due to chromium carbide formed to weld metal of 22APU and to heat affected zone of STS 304 can preferentially easily be corroded with more active anode than other fields. Consequently it is thought that application of the other welding methods like as laser welding or using of the optimum filler metals is necessary to improve the corrosion resistance of welding parts of these steels.
Keywords
GTAW; Corrosion potential; Weld metal; Heat affected zone; Polarization curve; Chromium depletion field; Corrosion current density;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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