汽车发动机用2A12合金的表面改性与耐蚀性能研究  

Surface Modification and Corrosion Resistance of 2A12 Alloy for Auto Engine

作　　者：王洪亮 李桂中[2] 

机构地区：[1]长春科技学院机械工程学院,吉林长春130600 [2]吉林大学材料学院,吉林长春130600

出　　处：《铸造技术》2016年第12期2587-2590,共4页Foundry Technology

摘　　要：对汽车发动机用2A12合金在不同浓度的锆盐溶液中进行了表面微弧氧化改性处理,研究了微弧氧化膜层的耐盐雾腐蚀性能、表面膜层显微组织。结果表明:微弧氧化膜层中主要含有AlMg_2O_4、Zr O_2、Zr_2O和Al_2O_3相;随着锆盐浓度增加,膜层的厚度和粗糙度逐渐增加;膜层的盐雾腐蚀速率与锆盐溶液浓度密切相关,盐雾腐蚀速率从低至高的锆盐溶液浓度依次为:10、5、0、15和20 g/L。Micro-arc oxidation modification treatment was conducted on 2A12 alloy for automobile engine in different concentrations of zirconium salt solutions, and the microstructure and salt spray corrosion resistance of the surface film were studied. The results show that the microstructure of the film consists of AlMg2O4, ZrO2, Zr2O and Al2O3. With the increase of zirconium salt concentration, the thickness and roughness of the film increase gradually; the salt spray corrosion rates of the film modified in different Concentrations of the zirconium salt solutions are different and in ascending order are 10, 5, 0, 15 and 20 g/L.

关 键 词：汽车发动机 2A12合金 锆盐溶液 膜层 腐蚀 

分 类 号：TG174.4[金属学及工艺—金属表面处理]