论文部分内容阅读
通过电偶电流测试和腐蚀形貌观察等方法,研究了5383铝合金分别与907钢和铝青铜组成的两种电偶体系的早期电偶腐蚀平面分布。研究结果发现,两种电偶对中5383铝合金为阳极,907钢和铝青铜则始终为阴极受到保护;5383铝合金的腐蚀形貌有亚稳点蚀、不规则点蚀和类丝状腐蚀;电偶电流随时间变化规律相似,即腐蚀初期电流迅速降低,之后趋于稳定;与偶接点的距离增大,电偶电流降低,且远端的电流分布较为均匀;5383铝合金与907钢偶接时比与铝青铜偶接时大部分区域电流密度更小,但电偶腐蚀更加集中于2 mm内的区域。
The galvanic corrosion patterns of two galvanic couples of 5383 aluminum alloy with 907 steel and aluminum bronze, respectively, were studied by means of galvanic current test and corrosion morphology observation. The results show that the 5383 aluminum alloy in the two galvanic couples is the anode, the 907 steel and the aluminum bronze are always protected by the cathode. The corrosion morphology of the 5383 aluminum alloy is metastable pitting, irregular pitting and filiform corrosion ; Galvanic current changes with time similar to the law, that is, the rapid decline in the initial corrosion current, and then tend to be stable; with the coupling point of the distance increases, the galvanic current decreases, and the far current distribution is more uniform; 5383 aluminum and 907 steel In the coupled case, the current density is smaller in most areas than in the case of aluminum bronze, but the galvanic corrosion is more concentrated in the area within 2 mm.