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http://dx.doi.org/10.5695/JKISE.2018.51.3.172

Study on the Effects of Oxidant on Chemical Passivation Treatment of Low Nickel Stainless Steel  

Choi, Jong-Beom (Department of Marine Engineering, Korea Maritime and Ocean University)
Lee, Kyung-Hwang (Research Institute of Industrial Science & Technology)
Yun, Yong-Sup (Department of Marine Engineering, Korea Maritime and Ocean University)
Publication Information
Journal of the Korean institute of surface engineering / v.51, no.3, 2018 , pp. 172-178 More about this Journal
Abstract
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.
Keywords
GDOES(Glow Discharge Optical Emission Spectroscopy); OCP(Open Circuit Potential); Potentiodynamic curves; Chemical surface treatment process; Oxidant; Salt Spray Test;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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