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采用含稀土Ce盐的化学溶液浸泡工艺在石墨纤维增强铝基(Gr/Al)复合材料表面制备无毒、无污染稀土耐蚀膜层,并对不同时间稀土Ce盐在Gr/Al复合材料表面的成膜情况进行研究.铝基体和石墨纤维表面均覆盖稀土膜层,此类稀土膜呈现“干泥”状,覆盖于Gr/Al复合材料表面.EDS面扫描结果表明:Al、O、C、Si、Ce和Mg是组成膜的主要元素;成膜30 min,稀土Ce质量分数达14.44%;成膜120 min,稀土Ce质量分数增加到47.48%.通过对其成膜过程进行研究,提出了膜层微裂纹的形成机制,其电化学成膜机理符合“微阴极成膜机理”.由于稀土转化膜的存在,腐蚀过程中析氢和吸氧反应均受到抑制,同时还抑制阳极反应的发生.
The non-toxic and non-polluted rare earth corrosion resistant coating was prepared on the surface of graphite fiber reinforced aluminum (Gr / Al) composite by chemical solution immersion with rare earth Ce salt. The effect of rare earth cerium on the surface of Gr / Al composite The results of scanning electron microscopy (SEM) and scanning electron microscopy (SEM) show that Al, O , C, Si, Ce and Mg are the main elements of the film. The film formation of 30 min, rare earth Ce mass fraction of 14.44%; film 120 min, rare earth Ce mass fraction increased to 47.48% , The formation mechanism of film microcracks was proposed and its electrochemical film forming mechanism was in line with the “micro-cathode film forming mechanism.” Due to the existence of rare earth conversion film, both hydrogen evolution and oxygen uptake reaction during the etching process were suppressed, Anode reaction occurs.