不锈钢表面热浸镀铝工艺及表面形貌  

Hot Dip Aluminizing Process and Surface Morphology on Stainless Steel Surface

作　　者：于思荣[1] 徐淑苗 邢海瑞 

机构地区：[1]中国石油大学(华东)机电工程学院,山东青岛266580

出　　处：《热加工工艺》2015年第10期153-156,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51075184);教育部中央高校基本科研业务费专项资金资助资助项目(11CX05003A);山东省自然科学基金资助项目(ZR2011EMM015);高等学校博士学科点专项科研基金资助课题(20110133110003)

摘　　要：通过控制浸镀液成分、热浸镀温度、热浸镀时间以及助镀剂等工艺因素,对304不锈钢进行热浸镀铝处理。采用金相显微镜观察热浸镀处理后试样表面质量,选出较优的热浸镀工艺参数。结果表明:采用不同的铝合金镀液,需要不同的助镀剂、浸镀温度及浸镀时间与之匹配。在纯铝液中,采用助镀剂NH4Cl+Zn Cl2,在750℃热浸镀10 min,试样表面组织较致密均匀,质量较好。采用Al-2%Si合金液作为镀液时,镀层表面粗糙度普遍较小。其中采用助镀剂NH4Cl+Zn Cl2时,在700℃下热浸镀15 min,试样表面粗糙度最小,表面较平坦。在Al-1.5%RE合金液中,采用助镀剂Cr2O3时,在750℃下热浸镀15 min,试样表面质量较好。不锈钢表面热浸镀铝层表面质量与其分形维数有密切关系,分形维数越大,表面微细结构越复杂,表面微观质量就越好。The hot dip al uminizing treatment of 304 stainless steel was carried out through controlling the dip bath composition,hot-dip temperature,hot-dip time and fluxing agent.The surface quality of the samples after hot-dipping treat ment was observed using optical microscope.The optimum process parameters were determined.The results show that the application of different aluminum alloy dip bathes needs the matching of different fluxing agent,hot-dip temperature,and hot-dip time.When NH4Cl＋Zn Cl2 is used as the fluxing agent,if the stainless steel sample is hot-dipped in pure aluminum melt at 750 ℃ for 10 min,the sample surface structure is dense,uniform,and better in quality.When Al-2%Si alloy melt is served as the dip bath,the coating surface roughness is generally small.When NH4 Cl ＋Zn Cl2 is used as the fluxing agent,if the stainless steel sample is hot-dipped in Al-2%Si alloy melt at 700 ℃ for 15 min,the sample surface roughness is minimum,and the surface is flat.When Cr2O3 is used as the fluxing agent,if the stainless steel sample is hot-dipped in Al-1.5%RE alloy melt at 750 ℃ for 15 min,the specimen surface quality is better.There is a close relationship between the surface quality of stainless steel hot-dip aluminizing coating and its fractal dimension.The bigger the fractal dimension is,the more complex the surface structure is,and the better the surface quality is.

关 键 词：热浸镀铝 不锈钢 表面质量 分形维数 

分 类 号：TG174[金属学及工艺—金属表面处理]