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Oral presentation

The Effect of [Cu(EDTA)]$$^{2-}$$ on crevice corrosion of type 316L stainless steel

Aoyama, Takahito; Kato, Chiaki

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Alloyed Cu is known to inhibit the growth of pitting corrosion on stainless steels after pitting initiation. The Cu$$^{2+}$$ dissolved from the stainless steel matrix acts as an inhibitor in acidic chloride environments which is formed in pits. The Cu$$^{2+}$$ suppresses active dissolution rate inside the pits$${1}$$. This suppression effect is supposed to be also effective for active dissolution which promotes crevice corrosion. Therefore, if it is possible to introduce Cu$$^{2+}$$ to the inside of a crevice from the outside, introduced Cu$$^{2+}$$ is supposed to inhibit crevice corrosion on stainless steel. However, diffusion of ions between inside and outside of the crevice is restricted by its geometry, and Cu$$^{2+}$$ does not migrate to inside of a crevice according to the electroneutrality principle. [Cu (EDTA (ethylenediaminetetraacetic acid))]$$^{2-}$$ is a chelated Cu$$^{2+}$$ which has negative charge, and is expected to migrate to inside of a crevice from the outside by electrochemical migration. In addition, it is reported that Cu$$^{2+}$$ in [Cu(EDTA)]$$^{2-}$$ could be easily substituted by Fe$$^{2+}$$ in low pH$$^{2}$$. Therefore, Cu$$^{2+}$$ is considered to be introduced to the inside of the crevice as [Cu(EDTA)]$$^{2-}$$, and to affect crevice corrosion of stainless steel. In this study, in situ observation of an inside of the crevice$$^{3}$$ was performed to analyze the effect of [Cu(EDTA)]$$^{2-}$$ on crevice corrosion.

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