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저니켈 스테인리스강의 화학적 부동태막 형성에 산화제가 미치는 영향
최종범(Jong-Beom Choi),이경황(Kyung-Hwang Lee),윤용섭(Yong-Sup Yun) 한국표면공학회 2018 한국표면공학회지 Vol.51 No.3
In this paper, effects of potassium permanganate, pottasium dichromate, sodium molybdate on lean duplex stainless steel were studied by GDOES, OCP, potentiodynamic curves. The stainless steels were chemically passivated in each nitric acid solutions containing 4wt.% oxidants for 1 hour. As a result, when potassium dichromate or sodium molybdate was added, content of Fe was decreased and content of Cr was increased. Consequently, corrosion resistance of passive film was increased. But in case of potassium permanganate was added, contrastively, content of Fe was increased and content of Cr was decreased. So corrosion resistance was decreased. Adding sodium molybdate in nitric acid for chemical surface treatment process was the most effective among oxidants and also it showed the most stable anti-corrosion in SST.