Synergistic effects of cavitation erosion and corrosion for nickel aluminium bronze with oxide film in 3.5% NaCl solution
Synergistic effects of cavitation erosion and corrosion for nickel aluminium bronze with oxide film in 3.5% NaCl solution
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DOI：
10.1016/j.wear.2017.01.047
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发表时间：
2017-04-15
期刊：
影响因子：
5
通讯作者：
Wood, R. J. K.
中科院分区：
文献类型：
--
作者：
Basumatary, J.;Wood, R. J. K.
用19.5 kHz间接超声振动系统在3.5%NaCl溶液中以80（+/-0.2）μ m的峰-峰振幅进行了在两种不同条件下形成氧化膜的镍铝青铜的空蚀-腐蚀试验，氧化膜在空气中形成1周，氧化膜在3.5%NaCl溶液中浸泡3个月。空蚀和腐蚀之间的协同相互作用通过包括三个不同测试的实验来确定：在蒸馏水中的纯空蚀试验，使用开路电位（OCP）和极化扫描的纯原位电化学腐蚀试验，空蚀-腐蚀复合体保持在3.5%的OCP NaCl溶液中的空蚀磨损试验，以了解空蚀磨损与腐蚀之间存在的整体协同作用。然后使用质量损失分析对结果进行分析和比较。扫描电子显微镜被用来分析空化样品表面的微观结构特征，以及表面特征的横截面。可以看出，与空气形成的膜相比，具有水形成的膜的样品表现出高的协同作用，并且更容易受到选择性相攻击和相边界侵蚀。(C)2017爱思唯尔B. V.保留所有权利。
Cavitation erosion-corrosion of nickel aluminium bronze with oxide films formed under two different conditions, oxide formed in air for 1 week and oxide formed after 3 months immersion in 3.5% NaCl solution, was conducted using a 19.5 kHz indirect ultrasonic vibratory system at a peak-to-peak amplitude of 80 (+/- 0.2) mu m in 3.5% NaCl solution. The synergistic interactions between the cavitation erosion and corrosion were determined via experiment comprising of three different tests: pure cavitation erosion test in distilled water, pure in-situ electrochemical corrosion tests using open circuit potentials (OCP) and polarization scanning, and a combination of cavitation erosion-corrosion kept at OCP in 3.5% NaCl solution to understand the overall synergism existing between cavitation wear and corrosion. The results were then analysed and compared using mass loss analysis. Scanning electron microscopy was used to analyse microstructural characteristics of the cavitated sample surfaces, as well as the transverse sections of the surface features. It was seen that samples with water formed film exhibited high synergy and was more susceptible to selective phase attack and phase boundary erosion in comparison to air formed film. (C) 2017 Elsevier B.V. All rights reserved.