발간논문

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Vol.23, No.9, 870 ~ 879, 1985
Title
The Effect of Precipitated Carbides on the Pitting Corrosion of 304 Stainless Steel
곽재현Jai Hyun Kwak, 김관휴Kwan Hyu Kim
Abstract
In order to investigate the relation between the pitting corrosion and precipitated carbides, the heat treatment of specimens was carried out in two ways: Solution treatment and carbides precipitation treatment. The experiment was focused on the polarization curves of specimens immersed in HCl solution and on the microscopic analysis of the corroded specimens through a potentiodynamic method. It was Found out that the intergranular and pitting corrosion occurred remarkably in 0.1N and 1N HCl solution when carbides were precipitated around the grain boundary of the 304 stainless steel. The intergranular corrosion was noticed in the region of passivation and the pitting was prominent in the region of passivation break-down. The distribution of pits on solution treated 304 stainless steel was random, while that of pits on carbides precipitated specimen was concentrated around the grainboundary in 0.1N and 1n HCl solution. It was ascertained that the pitting resistance of the solution treated 304 stainless steel was better than that of carbidds precipitated specimen.
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