Abstract
The electrochemical conditions conductive to improving pitting susceptibility of Type 304 stainless steel using potentiostatic etching and passivation pretreatment in 1N H2SO4 solution at various temperatures have been investigated. Pitting susceptibility after pretreatment was evaluated by measuring pitting potential in 3.5mass% or 7.0mass% NaCl solutions. A combination of etching treatment at 333K, -0.07V (vs. SHE) and passivation treatment at 344K, 0.75V was found to give the most noble pitting potential. This optimum condition maximized to cause the Cr/Fe ratio in the passive film, and this was confirmed by the IMA analysis. The condition for Cr enrichment in the film was discussed in terms of a comparison of the polarization behavior of Type 304 stainless steel with that of the alloying elements of Fe, Cr and Ni.
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