观察了挤压Mg合金AM60在pH值分别为3，7和12的3.5%NaCl 溶液中的腐蚀形貌，测量了蚀坑的数目和尺寸，讨论了pH值对AM60腐蚀的影响和AlMn相粒子在腐蚀中的作用，提出了AM60的点蚀模型. 实验表明，在溶液pH值为酸性和中性 (pH=3或pH=7)时，AM60产生点蚀，它萌生于与AlMn相粒子相邻的α相；pH值为碱性(pH=12)时，产生高Al区(如：AlMn 相和β相)的均匀腐蚀，呈现蜂窝状腐蚀形貌. pH=7时，点蚀坑数目最多.
The corrosion morphologies of as-extruded magnesium alloy AM60 in 3.5%NaCl aqueous solutions with pH 3，7 and 12 were observed, and the number and size of corrosion pits were measured. The effect of pH values on corrosion of AM60 and the role of AlMn particles in corrosion were discussed. A corrosion model of AM60 was put forward. The experimental results indicate that the pitting corrosion occurred in an acidic or neutral 3.5%NaCl aqueous solution, the pits initiated in the α matrix around AlMn particles, whereas Al element was dissolved in the rich-Al areas such as AlMn particles and β phase, and the honeycomb morphology was formed on the surface in alkaline solutions. The number of corrosion pits is most at pH 7.
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