ステンレス合金における孔食発生過程の電流振動解析

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  • An Analysis of the Current Fluctuations during Pit Initiation in Stainless Alloys
  • ステンレス ゴウキン ニ オケル コウショク ハッセイ カテイ ノ デンリュウ

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抄録

Noise analysis has become an important method for studying localized corrosion such as pitting corrosion on stainless alloys. The noise observed from anodic polarized stainless alloys is in the form of current fluctuations caused by the localized breakdown and repassivation of passive film. In this study, the current fluctuations from anodic polarized SUS 304 stainless steels and Fe-Cr-Si-B amorphous stainless alloys in 3% NaCl solution are measured. The shape, size, and other characteristics of each current fluctuation are analyzed.<br>The results are as follows. Passive film breakdown, pit growth and repassivation processes include a great random factor. Also both the pit growth rate and the repassivation rate become higher with potential rise. Amorphous stainless alloys indicate an extremely high repassivation rate which is related to a high pitting potential.

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