用恒电流试验、表面溶解形态、腐蚀产物X-ray衍射分析、 扫描电镜和能谱分析，对南海油田某海底输油管道的在役铝合金牺牲阳极的使用状况进行 了分析测试.结果证实，该阳极提前失效的原因是由于其组织结构存在缺陷，晶间偏析严重 导致晶间腐蚀所致.
This paper studied the present situation of WP alum inum alloy sacrificial anodes of sea bed oil-carrying pipelines in the oil field of south China sea.According to the results of potentiostatic test of anode,mic roanalysis of anode surface dissolution morphology,X-ray diffraction of anode co rrosion products,chemical analysis and SEM & EDS analysis,WP anode did not fit f or the long-term protection of ocean bottom oil-carrying pipelines.Moreover,it i s confirmed that the invalidity ahead of time mainly results from the structure defects.Solute segregation in crystal boundary results in intergr anular corrosion very seriously.
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