304不锈钢热浸镀铝/铝硅镀层的微观结构  

Microstructure of Hot-dip Al/Al-Si Coating on 304 Stainless Steel

作　　者：熊玮[1,2] 周雷[1] 贾涓 穆晓彪[1] 毕学工 周进东[1,2] XIONG Wei;ZHOU Lei;JIA Juan;MU Xiaobiao;BI Xuegong;ZHOU Jindong(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;Key Laboratory of New Technology of Iron and Steel Metallurgy in Hubei Province,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]武汉科技大学钢铁冶金新工艺湖北省重点实验室,湖北武汉430081

出　　处：《热加工工艺》2022年第8期79-82,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51604199);湖北省教育厅科学技术研究计划青年人才项目(Q20151106)。

摘　　要：为了提高热浸镀铝304不锈钢的使用温度,分别采用镀铝、镀铝硅和镀铝-铝硅(镀铝后再镀铝硅)3种方式进行了热浸镀试验,采用SEM和EDS分别对镀层的微观结构和成分进行了比较分析。结果表明,镀铝硅和镀铝-铝硅会形成3层甚至4层复杂的合金层结构,由于扩散不均匀,合金层内存在花纹状的明暗区域。镀液中添加Si元素能有效阻碍铁铝之间的扩散,使表层的Fe元素含量降低,Al元素含量增加,能够形成致密的氧化层。通过镀铝-铝硅方式形成的合金层较厚,达到了222μm,有利于提高镀层的抗高温氧化性能。In order to improve the use temperature of the hot-dip aluminized 304 stainless steel,the hot-dip coating was carried out in three ways,namely aluminizing,aluminum-plated silicon and aluminizing-aluminum-silicon(aluminized and then-aluminized silicon).The microstructure and composition of the coating were compared and analyzed by SEM and EDS,respectively.The results show that the Al-Al-Si and Al-Al-Si can form a three-layer or even four layer complex alloy layer structure.Due to the uneven diffusion,there is a pattern-like light and dark region in the alloy layer.The addition of the Si element in the plating solution can effectively block the diffusion between the iron and aluminum.Fe element content of the surface layer is reduced,the content of the Al element is increased,and a compact oxide layer can be formed.The alloy layer formed by aluminum-silicon plating is thicker and reaches 222μm,which is beneficial to improve the oxidation resistance of the coating at high temperature.

关 键 词：镀铝硅 304不锈钢 微观结构 抗高温氧化 

分 类 号：TG174.443[金属学及工艺—金属表面处理]