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Abstract
The effect of nickel on the corrosion behaviour of high-strength low alloy steel reinforcement was investigated by electrochemical measurement techniques, X-ray photoelectron spectroscopy, and auger electron spectroscopy. The results demonstrate that 3 wt% of nickel addition reduced the corrosion rate to 17 nA/cm2 compared to 730 nA/cm2 of carbon steel in the contaminated concrete condition. The enhancement of corrosion resistance for nickel-bearing steel was attributed to the formation of protective oxide film. The oxide film exhibited n-type semiconductivity in which oxygen vacancy was the main defect. The involvement of nickel in the formation process of oxide film changed its structure and composition. Nickel was enriched in the oxide film, simultaneously decreasing the defects density and the whole thickness of oxide film, and together with the increase of the Fe2+/Fe3+ ratio and the inner barrier oxide film thickness. The protective inner barrier layer of oxide film on the nickel-bearing steel can strongly inhibited the corrosive attack.
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