(1. 福州大学 材料科学与工程学院, 福州 350002;
2. 福州大学 机械工程及自动化学院, 福州 350002)
摘 要: 通过热喷涂的方法制备了添加稀土组分和适量铜组元的RE-Fe基合金涂层。 采用液态浸渍法、 电化学测试、 盐雾实验以及涂层表面腐蚀形貌SEM观察等方法对不同成分、 不同喷后处理工艺的RE-Fe基合金涂层的耐腐蚀性能进行研究。 结果表明: 添加适量的稀土组分和铜组元, 使Fe基合金涂层的自腐蚀电位正移, 维钝电流密度和致钝电流密度下降, 明显地提高了Fe基合金(Fe-Cr-Ni-B-Si)涂层在酸类腐蚀介质中的耐腐蚀性能; 同时也有效地提高了涂层抗盐雾气氛腐蚀的能力; 其中以添加2% RE氧化物(质量分数) 涂层(封孔后)的综合效果最佳。
关键字: 铁基合金涂层; 耐腐蚀性能; 热喷涂; 稀土
( 1. College of Materials Science and Engineering,
Fuzhou University, Fuzhou 350002, China;
2. College of Mechanical Engineering, Fuzhou University, Fuzhou 350002, China)
Abstract: Through adding different kinds of rare earth(RE) compositions and moderate amount of copper constituent , RE-Fe based alloy coatings were prepared by thermal spraying(THSP).The corrosion resistance of RE-Fe based alloy coatings with different compositions and post-spraying treatments were investigated systematically by maceration corrosion test, electrochemical test, NSS test and scanning electron microscopy. The results show that the addition of moderate amount of rare-earth compositions and copper constituent can increase remarkably the corrosion resistance of iron-based alloy (Fe-Cr-Ni-B-Si) coating in the acid and salt corrosion media, and the coating with 2% RE oxide composition (mass fraction) possesses the best comprehensive effects.
Key words: iron-based alloy coating; corrosion resistance; thermal spraying; rare earths