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中文摘要：
研究了铸态和挤压态AM60镁合金在太原地区的大气腐蚀行为。试验结果表明铸态合金的腐蚀速率高于挤压态合金。铸态合金中的共晶组织比α-Mg更具耐大气腐蚀能力,但是这导致了共晶相周围的α-Mg相腐蚀严重,且腐蚀产物膜也不均匀,保护性差。挤压态合金的最大腐蚀深度要远小于铸态合金。挤压态合金的显微组织比铸态更加均匀,而且不含有共晶组织,导致挤压态合金表面的腐蚀产物膜更加致密也更具有保护性。挤压变形不会引起AM60镁合金大气腐蚀性能的下降。
英文摘要：
Atmospheric corrosion behavior of cast AM60 Mg alloy and as-extruded AM60 Mg alloy was studied in Taiyuan city of China. The results show that the corrosion rate of the cast alloy is higher than that of the as-extruded alloy. α-Mg-Mg17Al12 eutectics in the cast alloy has better corrosion resistance than α-Mg phase in outdoor atmospheric environment, which causes more serious corrosion of the α-Mg phase nearby eutectics. Besides, the corrosion film on the as-extruded alloy is not uniform with a poor protective effect. The maximum depth of corrosion pit in the as-extruded alloy is smaller than that in the cast alloy. The as-extruded alloy has much uniform microstructures than the cast alloy and does not contain eutectics, which gives rise to a better protection effect of the corrosion film on the surface of the as-extruded alloy. Therefore, extruding process can not lead to a decrease in atmospheric corrosion resistance of AM60 Mg alloy.
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