AC-HVAF制备FeB/Co金属陶瓷涂层及其耐液锌的腐蚀性能  

Corrosion resistance of liquid zinc of FeB/Co cermet coating deposited by AC-HVAF

作　　者：叶平 尹付成 刘烨[1,2,3] 欧阳雪枚 谢小龙[1,2] YE Ping1,2, YIN Fu-cheng1,2, LIU Ye1,2,3, OUYANG Xue-mei1,2,XIE Xiao-long1,2(1. School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China; 2. Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan 411105, China; 3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, Chin)

机构地区：[1]湘潭大学材料科学与工程学院,湘潭411105 [2]湘潭大学材料设计及制备技术湖南省重点实验室,湘潭411105 [3]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2018年第4期782-791,共10页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51471141)~~

摘　　要：采用烧结破碎法制备了FeB/Co金属陶瓷粉末,探讨活性燃烧高速燃气喷涂(AC-HVAF)制备的FeB/Co涂层中Co含量对FeB/Co涂层孔隙率、硬度、结合强度、抗热震性能和磨粒磨损性能等的影响,研究FeB/Co涂层在熔融锌液中的腐蚀情况,分析FeB/Co涂层在锌液中的失效机理。结果表明:随着粘结相Co含量的提高,涂层致密度提高;当Co含量由8%增加到17%(质量分数)时,涂层的孔隙率降低,涂层硬度先提高后降低,涂层结合强度提高,涂层抗热震性能先提高后降低。与316L不锈钢基底材料相比,FeB/Co涂层具有更优异的耐锌液腐蚀性能及耐磨粒磨损性能;FeB/Co涂层在锌液中的润湿性很差,相比Co含量为8%和17%的涂层,Co含量为12%的涂层具有最佳的耐蚀性能。随着腐蚀的进行,涂层局部出现宏观裂纹,腐蚀沿着裂纹进行并形成脆性(Fe,Co)Zn_(13)相,导致涂层剥落并漂移到锌液中,从而使涂层失效。FeB/Co cermet powder was prepared by the sintered and crushed process. The effects of Co on the porosity, hardness, adhesion, thermal shock resistance and the abrasive wear persistance of the FeB/Co coating deposited by AC-HVAF were investigated. Both the corrosion condition and failure mechanism of FeB/Co coating in the molten zinc were studied detailedly. The results show that the powder density increases with increasing Co content. With Co content ranging from 8% to 17%（mass fraction）, the porosity of the coating reduces while the adhesive strength is improved, both the hardness and the shock resistance firstly increase and then decrease. In addition, compared with the base material of 316 L stainless steel, the FeB/Co coating shows excellent corrosion resistance in liquid zinc and abrasive wear property. Because the wetting property of FeB/Co coating in liquid zinc is poor, FeB/Co coating shows high durability in it. Also, the coating with 12% Co has the best corrosion resistance compared with those coatings with 8% Co and 17% Co, the macroscopic crack emerges with the passage of time, which results in the formation of brittleness（Fe,Co）Zn13 phase, and liquid zinc will lead to peeling the coating and then drifting into the liquid zinc, as a result, the coating is failed.

关 键 词：AC-HVAF FeB/Co 涂层 锌液腐蚀 

分 类 号：TG174.442[金属学及工艺—金属表面处理]