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首页> 外文期刊>Coatings >Galvanic Corrosion Performance of an Al–BN Abradable Seal Coating System in Chloride Solution
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Galvanic Corrosion Performance of an Al–BN Abradable Seal Coating System in Chloride Solution

机译：氯化物溶液中Al-BN可磨损密封涂层系统的电流腐蚀性能

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摘要

In this study, we investigated the galvanic corrosion performance of an Aluminum–Boron Nitride (Al–BN) abradable seal coating system (with a Ni5Al bond layer and a 0Cr17Ni4Cu4Nb substrate) in chloride solution by electrochemical methods. The results indicated a three-stage process occurred during the anodic dissolution of the coupled coating system, consisting of a spontaneous pitting stage I under charge transfer control with a decreasing rate, a corrosion developing stage II under mass transfer control with an increasing rate, and a final steady stage III. Precipitation of Al(OH)3 restricts the oxygen transport process to the cathode and induces localized acidification of the occluded pores of the Al–BN layer, which was the mechanism that could explain the changes of corrosion performance during the three immersion stages of Al–BN coating system. The study suggests that galvanic corrosion of the porous multi-layer Al–BN abradable coating system is mostly influenced by its corrosion product deposition.
机译：在本研究中，我们通过电化学方法研究了铝 - 氮化铝 - 氮化铝（Al-BN）磨损的密封涂层系统（用Ni5Al粘结层和0Cr17Ni 4Cu4NB基底）的电抗腐蚀性。结果表明，在偶联涂层系统的阳极溶解期间发生了三阶段的方法，其由在电荷转移控制下的自发性点倾级I组成，随着速度的增加，传质控制下的腐蚀发展阶段II，最后稳定的阶段III。 Al（OH）3的沉淀将氧气转运过程限制在阴极上，并诱导Al-BN层的闭塞孔的局部酸化，这是可以解释AL-的三个浸没阶段的腐蚀性能变化的机制BN涂层系统。该研究表明，多孔多层Al-BN可磨损涂层系统的电流腐蚀主要受其腐蚀产品沉积的影响。

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