用金相法、电阻法等研究了ＬＹ１２铝合金板材在ＥＸＣＯ溶液中的剥蚀行为。该合金的剥蚀是从点蚀发展到晶间腐蚀，并在内应力的协同作用下产生层状开裂与剥落。腐蚀深度与浸泡时间的对数呈直线关系，但分成有不同斜率的两个阶段。峰值时效合金的剥蚀敏感性比自然时效合金高。
The exfoliation behaviour of LY12 alloy in the EXCO solution was studied by metallography and electrical resistance methods.The main experimental results are as follows. During the exfoliation development,pitting occurred at first,then followed by intergranular corrosion.Exfoliation took place as a result of the combination of corrosion and tensile stress.A logarithmic relationship between corrosion depth and immersion duration was observed. However,the first and the second steps have different slopes.The peak aged LY12 alloy was found more susceptible to exfoliation than the naturally aged alloy.
参考文献
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