镁合金表面316不锈钢涂层HVOF沉积特性及耐蚀性  

HVOF deposition characteristics and corrosion resistance of 316 stainless steel coating on magnesium alloy surface

作　　者：李旭强 李文生[1,2] 张哲云 崔帅 邵磊[2] 翟海民 LI Xuqiang;LI Wensheng;ZHANG Zheyun;CUI Shuai;SHAO Lei;ZHAI Haimin(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,Shandong,China)

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050 [2]山东科技大学材料科学与工程学院,山东青岛266590

出　　处：《材料工程》2024年第11期175-185,共11页Journal of Materials Engineering

基　　金：国家自然科学基金(52265024,52075234);甘肃省青年科技人才托举工程(GXH20220530-15);甘肃省教育厅高等学校产业支撑计划(2020C-11);山东省重大基础研究项目(ZR2022ZD13);国家重点研发计划(2022YFE0121900);“111”计划(D21032)。

摘　　要：利用超音速火焰喷涂技术(HVOF)在镁合金表面沉积四种不同厚度的316不锈钢涂层(SSC2,SSC4,SSC7,SSC10),研究涂层的微观结构、沉积特性、残余应力和浸泡腐蚀特性。结果表明:因镁合金较低的熔点和硬度,喷涂颗粒易侵入基体并使其表面熔化,造成粒子的逃逸或飞溅,沉积效率较低;沉积较薄涂层(SSC2和SSC4)后,沉积颗粒逃逸或飞溅行为显著减少,沉积效率增加;沉积厚度增加至SSC7及以上时,沉积表面温度升高,粒子飞溅逐渐增多,涂层表面孔隙率和氧化物增加。随涂层厚度的增加,涂层残余压应力减小,应力分布均匀性提高,涂层中穿透性孔隙大幅降低并接近于零。SSC2和SSC4涂层内部存在穿透性孔隙,有效防护时间极短;厚涂层(SSC7级以上)在3.5%(质量分数)NaCl溶液中浸泡720 h后仍具防护作用。The 316 stainless steel coatings with different thicknesses(SSC2,SSC4,SSC7,SSC10)were deposited on the magnesium alloy surface by using the HVOF method.The microstructures,deposition characteristics,residual stresses and immersion corrosion characteristics of the coating were investigated.The results reveal that due to the lower melting point and hardness of magnesium alloy,spray particles are prone to invade the substrate and melt its surface,causing particle escape or splashing,resulting in lower deposition efficiency;after depositing thinner coatings(SSC2 and SSC4),the escape or splashing behavior of deposited particles reduces significantly,and the deposition efficiency increases;when the deposition thickness increases to SSC7 or above,the surface temperature of the deposition increases,particle splashing gradually increases,and the porosity and oxide content of the coating surface increase.Furthermore,as the coating thickness increases,the residual compressive stress of the coating decreases,the stress distribution becomes more uniform,and the number of penetrating pores in the coating decreases significantly,approaching zero.There are penetrating pores inside the SSC2 and SSC4 coatings,and the effective protection time is extremely short.The thick coatings(SSC7 and above)still have a protective effect after soaking in 3.5%(mass fraction)NaCl solution for 720 h.

关 键 词：镁合金 316不锈钢涂层 HVOF 残余应力 耐蚀性 

分 类 号：TG147[一般工业技术—材料科学与工程] TB31[金属学及工艺—金属材料]