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This study investigates the effect of ultraviolet (UV) illumination on the corrosion resistance of 304 stainless steel in molybdate-containing solution. The UV illumination was found to reduce the passivation and pitting resistance of the passive films. In addition, the passive film exhibited n-type semiconductor characteristics. Under UV illumination, the content of Cr2O3within the passive film decreased. Moreover, the formation of a built-in electric field inhibited the absorption of MoO42−on the substrate surface, thereby weakening the corrosion inhibition of Na2MoO4. This leads to a reduction in the corrosion resistance of the passive film.

In this paper, we studied the initiation of crevice corrosion of hydrogen-charged 2507 and investigated the effect of different Na2MoO4concentrations on crevice corrosion. It was found that Na2MoO4inhibits the adverse effect of hydrogen and enhances the inhibition of crevice corrosion. In addition, hydrogen-charged 2507 crevice corrosion initiates in the austenite phase. While Na2MoO4improves the crevice corrosion resistance of both phases, crevice corrosion initiation sites changed in reverse, initiating in the ferrite phase.