海洋环境下7B04铝合金腐蚀损伤演化规律研究

根据某海域的环境数据编制了当量加速腐蚀试验谱,实验室条件下腐蚀约8 d与海洋环境下腐蚀1 a相当,对7804铝合金材料进行了不同当量腐蚀年限的盐雾腐蚀试验;采用三维显微镜对腐蚀损伤进行观察和测量,采用腐蚀深度、截面积和无量纲参数等参数作为腐蚀损伤的表征量,分析了不同腐蚀时间的腐蚀坑的微观形貌特征,研究了各表征量的分布特性及随腐蚀时间的变化规律。

RESEARCH ON CORROSION DAMAGE EVOLVEMENT RULE OF 7B04 ALUMINUM ALLOY UNDER OCEAN ENVIRONMENT

According to the data of a certain sea area,the equivalent accelerated corrosion testing spectrum was compiled,in which the corrosion damage of accelerating corrosion testing for 8 d is equivalent to that of the ocean environment for 1 a.The accelerated slat spray testing in different equivalent corrosion duration of 7B04 aluminum alloy was performed.The corrosion damage is measured by optical microscope.And corrosion depths cross section area and area-box parameter are obtained.Pitting morphology varied with corrosion time was analyzed.The probability among these parameters and the variations of the corrosion damage with time were studied.