【摘要】 目的研究涂层组织形貌对涂层性能的影响。方法采用低压等离子喷涂方法制备316L不锈钢涂层,通过改变喷涂条件以及热处理工艺分别得到颗粒堆积、层片状和等轴晶三种不同组织的涂层。利用金相显微镜、X射线衍射、显微硬度计和浸泡实验,分析其金相组织、相结构、显微硬度和耐腐蚀性,对比分析三种不同涂层的性能。结果等轴晶涂层只含奥氏体相,而颗粒状和层片状涂层除奥氏体相外,还有?铁素体相。层片状涂层显微硬度最高(为262 HV0.3),颗粒状涂层次之(为243 HV0.3),等轴晶涂层硬度最低(为118 HV0.3)。在浓盐酸中浸泡1、2、3 h,层片状涂层质量损失分别为0.0110、0.0262、0.0445 mg/cm~2,颗粒状涂层质量损失分别为0.0078、0.0128、0.0262 mg/cm~2,等轴晶涂层质量损失分别为0.0071、0.0100、0.0126mg/cm~2。结论层片状涂层有最高的显微硬度和最差的耐腐蚀性,等轴晶涂层则有最好的耐腐蚀性和最低的显微硬度,颗粒状涂层介于两者之间。更多还原

【Abstract】 The work aims to study effects of coating microstructure on coating properties 316 L stainless steel coatings were deposited in the method of low pressure plasma spraying. Three different coatings with granular stacked, lamellar and equiaxed grain microstructures, respectively were obtained by changing spraying conditions and heat treatment process. Metallographic structure, phase composition, microhardness and corrosion resistance of the coatings were investigated with metallographic microscope, X-ray diffractometer(XRD), microhardness tester and by performing immersion test. Contrastive analysis was applied to properties of the three coatings. The equiaxed grains coating contained austenite phase only, while the granular and laminar coatings contained delta ferritic phase in addition to austenite phase. Microhardness of the laminar coating was the highest(262 HV0.3), followed by that of granular coating(243 HV0.3), and equiaxed grain coating the least(118 HV0.3). Mass loss of laminar coating soaked in concentrated hydrochloric acid per hour was 0.0110, 0.0262, 0.0445 mg/cm~2, respectively in 3 hours; that of granular coating 0.0078, 0.0128, 0.0262 mg/cm~2, respectively; and that of equiaxed grain coating 0.0071, 0.0100, 0.0126 mg/cm~2, respectively. Lamellar coating has the highest microhardness and worst corrosion resistance, equiaxed coating has the best corrosion resistance and the lowest microhardness, and granular coating is in between.更多还原