The role of nickel in mechanical performance and corrosion behaviour of nickel-aluminium bronze in 3.5 wt.% NaCl solution

By F. Yang, Huijun Kang, E. Guo, Rengeng Li, Zongning Chen, Yanhua Zeng, Tongmin Wang. Corrosion Science, 2018

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Abstract The mechanical properties and corrosion behaviour in 3.5 wt.% NaCl solution of as-cast nickel-aluminium bronze (NAB) alloys with four Ni contents were investigated. The increase in Ni content leads to more precipitated κ phases, therefore improving the yield strength and hardness of the NAB alloys. Ni addition was found to significantly suppress the formation of corrodible β' phase and increase the Ni concentration in α solid solution. The electrochemical impedance spectroscopic and static immersion tests showed that the increase in Ni content (4.5–10 wt.%) improved the corrosion resistance of the NAB alloys in 3.5 wt.% NaCl solution.

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