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Microstructure design to improve the corrosion and cavitation corrosion resistance of a nickel-aluminum bronze

Microstructure evolution of the nickel-aluminum bronze alloy was studied by heat treatment, including annealing, normalizing, quenching and aging. The microstructure was refined and homogenized after quenching or quenching/aging at 450 ?, which can eliminate selective phase corrosion effectively. Compared with the current production process, static corrosion rate reduced about 50%, due to the rapid formation of a protective film. In addition, cavitation corrosion rate reduced by a factor of 4.9 and 7.9 for the quenched and quenched/aged at 450?? samples, respectively. This can be attributed to the improved hardness and weakened synergy between corrosion and mechanical attack.

» Author: Zhenbo Qin, Qi Zhang, Qin Luo, Zhong Wu, Bin Shen, Lei Liu, Wenbin Hu

» Reference: Corrosion Science, Volume 139

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