奥氏体不锈钢镀纯铁、氟化处理后低温气体渗碳层的硬度和耐蚀性能  

Hardness and Corrosion Resistance of Low-Temperature Gas-Phase Carburization Coatings on Austenitic Stainless Steel after Pretreatments of Iron Electroplating or Fluorination

作　　者：杨闽红[1] 李朋[1] 潘邻[1] 张良界[1] 董根成 

机构地区：[1]武汉材料保护研究所,湖北武汉430030 [2]武汉新世界制冷工业有限公司,湖北武汉430032

出　　处：《材料保护》2012年第7期60-61,76,共2页Materials Protection

基　　金：国家自然科学基金(50975210)资助

摘　　要：奥氏体不锈钢硬度低,使用寿命短,表面附着的钝化膜妨碍了其低温渗碳。采用电镀纯铁和氟化法对其表面进行处理,去除表面钝化膜后,500℃气体渗碳。结果表明:氟化处理比电镀纯铁去除钝化膜的效果好,2种前处理后低温气体渗碳层表面硬度均有明显提高,可满足构件硬度为600～800 HV的需求;渗碳层厚度均匀,耐蚀性略有提高。Austenitic stainless steel has low hardness and poor service life, and the passivation film on its surface makes it hard to be carburized. Thus pre-treatments of iron electroplating and fluorination were conducted for austenitic stainless steel subjected to carburizing. After the surface passivation film was removed by pretreatments, the stainless steel was gas-phase carburized at a lowered temperature of 500 ℃. The hardness and corrosion resistance of as-obtained carburizing coatings were analyzed. Results show that fluorination as a pretreatment is more effective than iron electroplating in removing the passivation film on the stainless steel surface. The carburizing coatings formed on the stainless steel substrates after two kinds of pretreatments both have significantly increased hardness, meeting with the requirement of surface hardness of stainless structures between 600~800 HV. Besides, the carburizing coatings in relation to two kinds of pretreatments are both uniform and possess slightly improved corrosion resistance than the steel substrate.

关 键 词：低温气体渗碳 奥氏体不锈钢 电镀纯铁 氟化处理 硬度 耐蚀性 

分 类 号：TG156.81[金属学及工艺—热处理]