车用轻质材料铝合金/CFRP在3.5% NaCl溶液中的腐蚀行为

Corrosion Behavior of Auto-used Aluminum Alloys/CFRP in NaCl Solution

采用浸泡失重法和极化曲线法研究了螺栓螺母紧固件连接的三种铝合金和碳纤维环氧树脂复合材料(CFRP)的腐蚀行为;利用光学显微镜和台阶仪分别表征了腐蚀形貌和蚀坑深度,研究了CFRP表面粗糙度对腐蚀行为的影响。结果表明,偶合样品中金属表面发生电偶腐蚀和缝隙腐蚀,铝合金的腐蚀程度与自身的耐蚀性成正比;随着复合材料表面粗糙度的增加,铝合金发生腐蚀的面积增大,腐蚀深度减小。

The corrosion behavior of the couples of carbon fiber refinforced polymer （CFRP） and three kinds of aluminum alloys was investigated through tafel curves and weight loss method. The morphology was observed by optical microscopy （OM）, and the corrosion depth was tested by step profiler. The effect of surface roughness of CFRP on corrosion behavior was studied. The results indicated that galvanic corrosion and crevice corrosion occured on the aluminum alloy＇s surface between the coupled materials. A proportional relation was found between the degree of corrosion measured and the own corrosion resistance of the aluminum alloys. As the surface roughness of CFRPs increased, the corrosion depth of aluminum alloys reduced and the corrosion area increased.