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Report No.

Decrease in pitting corrosion resistance of extra-high-purity type 316 stainless-steel by Cu$$^{2+}$$ in NaCl

Aoyama, Takahito  ; Ogawa, Hiroaki ; Kato, Chiaki  ; Ueno, Fumiyoshi  

The effect of Cu$$^{2+}$$ in bulk solution on pitting corrosion resistance of extra high purity type 316 stainless steel was investigated. Pitting occurred in 0.1 M NaCl-1 mM CuCl$$_2$$ whereas pitting was not initiated in 0.1 M NaCl. Although deposition of Cu$$^{2+}$$ on the surface occurred regardless of potential region in 0.1 M NaCl-1 mM CuCl$$_2$$, Cu$$^{2+}$$ in bulk solution had no influence on the passive film formation. The decrease in pitting corrosion resistance in 0.1 M NaCl-1 mM CuCl$$_2$$ resulted from the deposited Cu or Cu compound and continuous supply of Cu$${2+}$$ on the surface.



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Category:Materials Science, Multidisciplinary



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