Abstract The effect of Sr addition on corrosion behaviour of AZ31 was investigated. The corrosion properties were characterized by immersion, electrochemical, scanning Kelvin probe microscopy and microstructural experiments. With increasing Sr concentration, the Vf of Al-Sr precipitates increases. Furthermore, SKPFM results show that Al-Sr and Al-Mn precipitates are cathodic compared to the base Mg matrix. Consequently, more micro-galvanic cells are formed by more precipitates resulting in severe corrosion attack. Corrosion starts at regions close to the precipitates and proceeds through the inter-precipitate region. Nyquist plots indicate that the stability of hydroxide/oxide protective film decreased with increasing Sr concentration.

中文翻译：

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含不同量锶的AZ31镁合金的腐蚀行为

摘要 研究了Sr添加量对AZ31腐蚀行为的影响。通过浸泡、电化学、扫描开尔文探针显微镜和微观结构实验来表征腐蚀特性。随着 Sr 浓度的增加，Al-Sr 析出物的 Vf 增加。此外，SKPFM 结果表明，与基体 Mg 基体相比，Al-Sr 和 Al-Mn 沉淀物是阴极。因此，更多的微原电池由更多的沉淀物形成，导致严重的腐蚀攻击。腐蚀从靠近沉淀物的区域开始，并通过沉淀间区域进行。Nyquist 图表明氢氧化物/氧化物保护膜的稳定性随着 Sr 浓度的增加而降低。