铸铁表面摩擦涂覆和感应加热扩散渗铝方法  

Method of Friction Coating and Induction Heating Aluminizing on Cast Iron Surface

作　　者：贺庆强[1] 许智彬 尹德聪 魏晓旋 汤硕 杨博雅 HE Qingqiang;XU Zhibin;YIN Decong;WEI Xiaoxuan;TANG Shuo;YANG Boya(College of Mechanical and Electrical Engineering,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)机电工程学院,青岛266580

出　　处：《中国表面工程》2022年第1期257-263,共7页China Surface Engineering

基　　金：山东省自然科学基金(ZR2019MEM038);中央高校基本科研业务费专项资金(18CX02090A)资助项目。

摘　　要：为了改善铸铁在恶劣环境下的腐蚀问题,采用涂覆渗铝的表面改性技术在铸铁表面进行铝涂层制备。以HT150为研究对象,对其进行摩擦涂覆渗铝处理,随后对涂层进行高频感应加热扩散和普通加热扩散处理。通过正交试验研究滚花量、扩散处理温度及保温时间对渗层厚度的影响,采用SEM和EDS定量分析渗层厚度变化。结果表明:滚花处理后进行摩擦涂覆可制备较大厚度的纯铝层,显著影响扩散处理后的渗铝层厚度;两种扩散退火处理均促使渗层厚度明显增大,但相同加热温度下,高频感应加热扩散比普通加热扩散的效率更高、效果更好。采用前者,铸铁试样在2~6 min内渗层厚20~160μm。采用滚花预处理与感应扩散相结合的涂覆方式制备的渗层厚度较常规涂覆方式明显增加,采用该方式可制备腐蚀性能较好的渗铝层。In order to improve the corrosion of cast iron in harsh environment,aluminum coating is prepared on cast iron by surface modification technology of aluminizing coating.HT150 is treated by friction coating and aluminizing,followed by high-frequency induction heating diffusion and ordinary heating diffusion.The effects of knurling amount,diffusion treatment temperature and holding time on the thickness of permeable layer are studied by orthogonal test,and the change of permeable layer thickness is quantitatively analyzed by SEM and EDS.The results show that the pure aluminum layer with larger thickness can be prepared by friction coating after knurling treatment,and the thickness of aluminizing layer after diffusion treatment is significantly affected.Both diffusion annealing treatments significantly increase the thickness of the permeable layer,but under the same heating temperature,the high frequency induction diffusion has higher efficiency and better effect than ordinary heating diffusion.With the former,the layer thickness of cast iron sample is 20-160μm in 2-6 min.The thickness of the aluminized layer prepared by knurling pretreatment combined with induction diffusion method is obviously increased compared with the conventional coating method.The aluminized layer with better corrosion performance can be prepared by using this method.

关 键 词：碳钢 摩擦涂覆 渗铝层 扩散退火 铁铝合金层 

分 类 号：TG174[金属学及工艺—金属表面处理]