EXCO溶液与沿海大气环境中铝合金的剥蚀损伤等效关系模型

Equivalent Relationship Model of Exfoliation Corrosion Damage for Aluminum Alloy in EXCO Solution and Coastal Atmospheric Environment

为建立铝合金材料在沿海大气环境中的剥蚀损伤与实验室EXCO溶液加速剥蚀损伤之间的等效关系,在已有的万宁大气腐蚀研究基础上,对2A12-T4铝合金在EXCO溶液中的腐蚀特性开展了研究,对腐蚀过程中腐蚀液pH变化规律及不同腐蚀时间后试件最小剩余厚度分别进行了研究;在此基础上,讨论了2A12-T4铝合金在EXCO溶液中的腐蚀机理,建立了EXCO溶液与沿海大气环境中铝合金的剥蚀损伤等效关系模型;基于最小剩余厚度等效原则得到模型的具体参数值,模型的误差小于0.92%。

In order to study the equivalent relationship of exfoliation corrosion damage of aluminum alloy in EXCO solution and in coastal atmospheric environment,the corrosion characteristics of 2A12-T4 aluminum alloy in EXCO solution were studied on the basis of the existing Wanning atmospheric corrosion researches.The change law of the solution pH value in corrosion process and the minimum residual thickness of the test plates after corrosion for different times were studied.On the basis of this,the corrosion mechanism of 2A12-T4 aluminum alloy in EXCO solution was discussed,and the equivalent relation model of exfoliation corrosion damage in EXCO solution and in Wanning atmospheric environment was established.Based on the equivalent principle of minimum residual thickness,the equivalent model parameters were obtained respectively,and the error of the model was less than 0.92%.