In the present study, the effect of alloying AZ91 magnesium alloy with 0.4 wt.% silver as well as chilled casting on the corrosion response of different casting conditions was investigated. Scanning electron microscopy (SEM), x-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP) tests were carried out to analyze the effect of silver and chilled solidification on the corrosion performance of AZ91 alloy. The silver-containing samples showed better corrosion resistance, mainly due to its effect on the microstructure modification of the alloy by altering the morphology of the β-Mg₁₇Al₁₂ phase. As a result, corrosion current density of silver-containing samples was lower than the original AZ91 Mg alloy down to 4 times. The corrosion rate of to the AZ91 alloy with 0.4 wt.% silver and pouring temperature of 750 °C was 0.256 mm.y^-1. More uniform microstructure of the β phase due to the addition of silver could facilitate the uniform growth of corrosion products, which led to the lower corrosion rate of the AZ91 alloy.

在本研究中，研究了将AZ91镁合金与0.4 wt。％的银合金化以及冷铸件对不同铸造条件下腐蚀响应的影响。进行了扫描电子显微镜（SEM），X射线衍射（XRD），电化学阻抗谱（EIS）和电势极化（PDP）测试，以分析银和冷凝固对AZ91合金腐蚀性能的影响。含银的样品通过改变的形态表现出更好的耐腐蚀性，主要是由于其对合金的微观结构改性效果β-Mg系₁₇的Al ₁₂相。结果，含银样品的腐蚀电流密度比原始AZ91 Mg合金低4倍。银对0.4重量％的银和浇注温度为750℃的AZ91合金的腐蚀率为0.256mm.y ^-1。由于添加了银，β相的微观结构更加均匀，可以促进腐蚀产物的均匀生长，从而降低了AZ91合金的腐蚀速率。