稀土化合物缓蚀剂对Al2024铝合金防护的研究

Protection of Al2024 Aluminum Alloys by Rare Earth Compound Inhibitors

研究用于Ａｌ２０２４铝合金的稀土化合物缓蚀剂，用来代替铬酸盐化合物。应用铈或镧的化合物，将Ａｌ２０２４铝合金浸入醋酸铈或醋酸镧的溶液中，当Ｃｅ３＋或Ｌａ３＋浓度仅５０～１００×１０－６时，放置不同时间，电化学测试表明：浸泡稀土溶液的Ａｌ２０２４合金表面，具有良好的抗腐蚀性能，其结果与同浓度的ＣｒＯ３和Ｎａ２ＣｒＯ４溶液相当。稀土化合物对环境无害，有希望替代铬酸盐化合物作为铝合金的缓蚀剂。

The research has been focused on finding an alternative to chromiumbase compounds for use in Al2024 alloys inhibitor formulations These inhibitors for surface protection of aluminum alloys are various cerium or lanthanum salt solution, for Al2024 treated by immersion in cerium acetate or lanthanum acetate solution with different time, using DC electrochemical corrosion measurement technique, good corrosion resistance surface were found, the concentration of Ce3+ or La3+ is only 50～100×10-6, the results were also compared to CrO3 and Na2CrO4 solution at same concentration Since rare earth salts is environmentallycompliant and produces exceptional corrosion resistance, it should be considered as a candidate for the replacement of chromate inhibitors