The synergistic effect of cavitation erosion and corrosion of nickel-aluminum copper surface layer on nickel-aluminum bronze alloy
The synergistic effect of cavitation erosion and corrosion of nickel-aluminum copper surface layer on nickel-aluminum bronze alloy
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镍铝铜表层空蚀与腐蚀对镍铝青铜合金的协同作用
DOI：
10.1016/j.jallcom.2018.03.103
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发表时间：
2018-05-30
影响因子：
6.2
通讯作者：
Hu, Wenbin
中科院分区：
文献类型：
--
作者：
Luo, Qin;Zhang, Qi;Hu, Wenbin
采用热扩散工艺在镍铝青铜（NAB）基体上获得了完整的镍铝铜（Ni-Al-Cu）共渗层。NAB合金在空蚀试验过程中的累积质量损失分别是Ni-Al-Cu层在蒸馏水和3.5wt%氯化钠（NaCl）中的累积质量损失的6.4倍和5.5倍。通过静态和空蚀条件下的电化学测试，研究了空蚀和腐蚀的协同效应。结果表明，NAB合金和Ni-Al-Cu镀层的协同作用对空蚀腐蚀过程均有一定的影响。空蚀成分中W-E和W-CIE的贡献率总和超过80%，其中W-E所占比例最大。因此，Ni-Al-Cu层抗空蚀性能的提高主要是由于机械因素，这意味着均匀和细化的组织和硬化Ni 3Al相的形成。(C)2018 Elsevier B. V.版权所有。
A completely nickel-aluminum-copper (Ni-Al-Cu) layer was obtained through thermal diffusion process on a nickel-aluminum-bronze (NAB) substrate. The cumulative mass loss of the NAB alloy during the cavitation erosion tests was about 6.4 times and 5.5 times as large as that of the Ni-Al-Cu layer in distilled water and 3.5 wt% sodium chloride (NaCl), respectively. Electrochemical measurements under quiescence and cavitation erosion conditions were conducted to investigate the synergistic effects of cavitation erosion and corrosion. The results showed that the synergism had measurable effect on the cavitation erosion-corrosion process for both the NAB alloy and the Ni-Al-Cu layer. The total contribution of the cavitation erosion component including W-E and W-CIE was more than 80% and W-E occupied the largest percentage. Thus, the improved cavitation erosion resistance of the Ni-Al-Cu layer was mainly due to mechanical factors, which implied a homogeneous and refined microstructure and the formation of hardened Ni3Al phase. (C) 2018 Elsevier B.V. All rights reserved.