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Effects of Ultrasonic Surface Rolling on the Localized Corrosion Behavior of 7B50-T7751 Aluminum Alloy

机译：超声波表面轧制对7B50-T7751铝合金局部腐蚀行为的影响

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摘要

The effects of an ultrasonic surface rolling process (USRP) on the localized corrosion behavior of 7B50-T7751 aluminum alloy in a sodium chloride + hydrogen peroxide solution were investigated through microstructural observation, immersion testing, and electrochemical measurements. The results revealed that this alloy is prone to pitting. However, the localized corrosion resistance can be significantly improved via both one-pass USRP and 12-pass USRP treatment. Furthermore, in the test solution, the thickness and the acceptor density of the passivation film were affected by the USRP treatment. The improved corrosion resistance of one-pass USRP-treated samples resulted mainly from the introduced compressive residual stress. However, this stress played a secondary role in the considerable enhancement observed for the corrosion resistance of the 12-pass USRP-treated samples. This enhancement is attributed primarily to the nanocrystalline surface and homogeneous surface microstructure induced by the multiple-pass USRP treatment.
机译：通过微观结构观察，浸没测试和电化学测量，研究了超声波表面轧制工艺（USRP）对7B50-T7751铝合金在氯化钠+过氧化氢溶液中局部腐蚀行为的影响。结果表明，这种合金容易出现点蚀。但是，通过单次通过USRP和12次通过USRP处理可以显着提高局部耐腐蚀性。此外，在测试溶液中，钝化膜的厚度和受体密度受USRP处理的影响。单次通过USRP处理的样品改善的耐腐蚀性主要归因于引入的压缩残余应力。但是，这种应力在观察到的经过12道USRP处理的样品的耐蚀性显着提高中起次要作用。这种增强主要归因于多次通过USRP处理所诱导的纳米晶体表面和均匀的表面微观结构。

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