低碳WC-12Co涂层制备工艺参数优化及熔锌腐蚀性能研究  

Optimization of Preparation Process Parameters of Low Carbon WC-12Co Coatings and Study on Corrosion Resistance in Molten Zinc Bath

作　　者：王韶毅 邱晓来 王群[4] WANG Shaoyi;QIU Xiaolai;WANG Qun(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China;Chongyi Zhangyuan Tungsten Industry Co.,Ltd.,Chongyi 341300,China;ChaoDa Valve Group Co.,Ltd.,Wenzhou 325105,China;College of Materials Science and Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]江西理工大学材料冶金化学学部,江西赣州341000 [2]崇义章源钨业股份有限公司,江西崇义341300 [3]超达阀门集团股份有限公司,浙江温州325105 [4]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《材料保护》2023年第11期63-68,共6页Materials Protection

基　　金：湖南省自然科学基金面上项目(2023JJ30153);赣州市重点研发计划重点项目(202101074491)资助。

摘　　要：为优化镀锌沉没辊表面涂层的抗熔锌腐蚀性能,采用超音速火焰喷涂技术在316L不锈钢基体上制备了低碳WC-12Co涂层,并设计了4因素3水平[L9(3^(4))]正交试验对喷涂工艺进行了优化,分别对低碳WC-12Co涂层的相结构、显微组织、孔隙率、结合强度和抗熔锌腐蚀性能进行了测试。结果表明:喷涂工艺参数的变化对涂层的相结构的影响很小,但对涂层的孔隙率影响显著,喷涂工艺参数中各因素对涂层孔隙率的影响按从大到小排列顺序为:煤油流量>喷涂距离>送粉率>氧气流量。获得最低孔隙率WC-12Co涂层喷涂工艺参数如下:煤油流量为26.5 L/h,氧气流量为55.2 m^(3)/h,送粉率为60 g/min,喷涂距离为326 mm,在这一参数下制备的高致密度的低碳WC-12Co涂层对熔融的锌液能起到很好的隔离作用,适合用于镀锌沉没辊的表面防护。To optimize the corrosion resistance in molten zinc of the surface coating of the galvanized sinking roll,the low carbon WC-12Co coatings were prepared on 316L stainless steel substratre using supersonic flame spraying technology,and a kind of four factors and three levels(L9(34))orthogonal experiment was designed to optimize the spraying process.Subsequently,the phase structure,microstructure,porosity,bonding strength and resistance to molten zinc corrosion of low carbon WC-12Co coatings were evaluated.Results showed that the change of spraying process parameters had little effect on the phase composition of the coatings,but had a significant effect on their porosities.The influ-ence of various factors in the spraying process parameters on the porosity of the coating was arranged in descending order:kerosene flow rate>spraying distance>powder feeding rate>oxygen flow rate.Moreover,the spraying process parameters that could obtain the lowest porosity WC-12Co coating were the kerosene flow of 26.5 L/h,the oxygen flow of 55.2 m^(3)/h,the powder feeding rate of 60 g/min,and the spraying distance of 326 mm.The high-density low carbon WC-12Co coating with high compact microstructure prepared under these parameters could effectively isolate the molten zinc,which was suitable for the surface protection of galvanized sink rolls.

关 键 词：超音速火焰喷涂 低碳WC-12Co涂层 工艺参数 孔隙率 沉没辊 熔锌腐蚀抗力 

分 类 号：TG174[金属学及工艺—金属表面处理]