engleski

Passivation of welded AISI 316L stainless steel

The paper deals with the results of passivation of welded AISI 316L austenitic stainless steel. The effectiveness of passivation in a 6.0 vol% HNO3 solution containing 2.0 wt.% CuSO4• 5H2O was tested by potentiodynamic polarization. Polarization was carried out in demineralized water before passivation and after it. At 80 °C demineralized water induced pitting corrosion and passivation was undertaken to protect the steel surface. As a result of passivation the pitting potential decreased. The satisfactory protective properties of the passive film on steel surface were found to agree with the high value of the pitting potential. After passivation, the presence of white dotty agglomerations of copper atoms was observed on the surface in the proximity of the melted zone.

stainless steel ; passivation ; pitting corrosion ; morphology

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