Abstract Actively propagating localized corrosion fronts on pure Mg, Mg-Zn-Ca-Mn, and Mg-Y alloys in NaCl aqueous solutions were investigated by site-specific characterization techniques. Regardless of alloy microstructure and polarization conditions, rising streams of hydrogen bubbles were observed predominantly at the propagating corrosion fronts. Localized corrosion propagated inside the alloys, underneath a surface corrosion film, and exhibited a finger-like morphology at the corrosion region/alloy interface. Hydrogen evolution was found to be related to the formation of corrosion products and followed local anodic dissolution of Mg. Localized corrosion morphology strongly varied with the underlying Mg alloy microstructure and chemistry.

中文翻译：

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镁合金局部腐蚀前沿的显微组织及其与析氢的关系

摘要 通过特定位点表征技术研究了纯 Mg、Mg-Zn-Ca-Mn 和 Mg-Y 合金在 NaCl 水溶液中局部腐蚀前沿的主动传播。无论合金微观结构和极化条件如何，主要在腐蚀传播前沿观察到上升的氢气泡流。局部腐蚀在合金内部、表面腐蚀膜下方传播，并在腐蚀区域/合金界面处呈现手指状形态。发现析氢与腐蚀产物的形成有关，并伴随着 Mg 的局部阳极溶解。局部腐蚀形态随底层镁合金微观结构和化学性质的不同而变化很大。