Materials Transactions Online

Materials Transactions, Vol.59 No.05 (2018) pp.779-786
© 2018 The Japan Institute of Metals and Materials

Corrosion Behavior of Sn-Bearing Steel under Wet/Dry Cyclic Environments Containing Cl

Kiyonobu Sugae1, Takayuki Kamimura1, Hideaki Miyuki2 and Takeo Kudo3

1Research & Development, Nippon Steel & Sumitomo Metal Corporation, Amagasaki 660-0891, Japan
2Formerly at Research & Development, Nippon Steel & Sumitomo Metal Corporation, Amagasaki 660-0891, Japan
3Formerly at Corporate Research & Development Laboratories, Sumitomo Metal Industries Ltd., Amagasaki 660-0891, Japan

The corrosion potential and corrosion rate of steel under wet/dry transitions were investigated using the Kelvin probe/pressure difference measurement system in order to elucidate the effect of Sn on the corrosion of steel covered by a thin electrolyte film in wet/dry environments containing chloride ions (Cl). The corrosion rate in the case of an electrolyte containing Cl during the drying stage was higher than that in the case of an electrolyte containing sulfate ions (SO42−). Cl accelerate the hydrolysis of Fe3+ and lead to the acidification of the anode site in the thin electrolyte film, while also contributing to corrosion during the drying stage. The Sn-bearing steel showed a lower corrosion rate during the drying stage than that of the mild steel. This was because the Sn ions from the steel can exist stably in the acidic thin electrolyte film and inhibit the anodic reaction during the drying stage. Thus, the superior corrosion resistance of the Sn-bearing steel under atmospheric conditions is attributable to the retardation of the anodic reaction during drying by Sn ions.

[doi:10.2320/matertrans.M2017417]

(Received 2017/12/27; Accepted 2018/02/13; Published 2018/04/25)

Keywords: steel, atmospheric corrosion, Kelvin probe, Sn

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