304不锈钢热浸镀铝工艺及镀层的耐冲蚀性能  

Hot Dip Aluminizing Process and Erosion Corrosion Resistance of 304 Stainless Steel

作　　者：姜峰[1] 张志浩[1] 王毅坚[1] 王海洋 JIANG Feng;ZHANG Zhi-hao;WANG Yi-jian;WANG Hai-yang(College of Mechanical and Electrical Engineering,Jilin Institute of Chemical Technology,Jilin 132022,China)

机构地区：[1]吉林化工学院机电工程学院

出　　处：《材料保护》2019年第5期83-85,110,共4页Materials Protection

基　　金：吉林化工学院一般项目(2017034);吉林化工学院重大项目(2018034)资助

摘　　要：为提高304不锈钢在实际工况中应用时的耐腐蚀性能,采用熔剂法对304不锈钢热浸镀铝,并对镀铝层进行扩散退火处理,通过厚度测试,形貌观察及成分分析优选了热浸镀工艺及扩散退火工艺,并采用冲刷腐蚀试验研究了最佳工艺制备的镀层的冲蚀性能。结果表明:304不锈钢热浸镀Al-3.0%Si-0.5%RE,在740℃左右浸镀15min时,镀层厚度为100μm左右;在820℃扩渗4 h,获得了较好的扩渗层,其厚度约为115μm;冲蚀时间达到120 h时,经最佳条件热浸镀铝+扩散退火处理后镀层的冲蚀失重速率最小,为0.092 g/(h·m2),未热浸镀铝及扩散退火处理的304钢原始试样的冲蚀失重速度相对较快,其冲蚀腐蚀速率为0.121 g/(h·m^2),约为热浸镀铝试样的1.32倍。Hot dip aluminizing of 304 stainless steel was carried out by flux method,which was then followed by diffusion annealing. Through thickness measurement,morphology observation and composition analysis,the hot dip galvanizing technology and diffusion annealing process were optimized. The erosion corrosion resistance of the specimens in 3. 5% NaCl aqueous solution was studied by erosion corrosion method.Results showed that the average thickness of Al-3.0%Si-0.5%RE hot-dip coating on 304 stainless steel was about 100 μm at 740 ℃ for 15 min,and at 820 ℃ for 4 h the diffusion layer was better and its average thickness was 115 μm. Moreover,the erosion time reached 120 h,the weight loss rate of 304 steel by hot dip aluminizing and diffusion annealing was the slowest,which was 0.092 g/( h·m^2). The weight loss rate of non-hot-dipped aluminum sample was relatively fast [0.121 g/( h·m^2) ],which was 1.32 times that of the hot-dip aluminizing sample.

关 键 词：304不锈钢 热浸镀铝 Al-3.0%Si-0.5%RE 耐冲蚀性能 

分 类 号：TG174.443[金属学及工艺—金属表面处理]