超音速火焰喷涂鉄基粉末涂层取代硬镀铬在印刷行业的应用

目前,在印刷行业采用HVOF喷涂铁基合金涂层取代硬镀铬处理印刷辊成为必然的趋势。首先,采用喷涂AISI316L材料在此应用领域基本上可满足其抗腐蚀条件。不过,AISI316L材料的耐磨损性能却不能满足其应用环境。采用GTV公司的K2喷涂系统,使用两种不同的高铬含量和高硼含量硬合金材料可以达到更高的耐腐蚀性能和同等的抗磨损效果。当然,喷涂参数以及喷涂颗粒的状况和涂层的显微组织结构都需要进行优化。下文中对本涂层的耐磨和抗腐蚀性能与AISI316L材料和硬质合金材料进行了比较。新开发的铁基硬合金材料涂层的平均硬度可达850HV0.3。与传统的AISI316L涂层相比,在进行盐雾试验和摩擦磨损试验中,铁基合金材料涂层的耐腐蚀和抗磨损性能要高得多。试验结果得到证实,并且在目前全球顶尖的印刷设备生产商开始正式的投用。

Hard Chrome Replacement by Iron Based HVOF Coatings in Printing Industries

Cost advantageous iron based alloys are sprayed by HVOF on offset printing machine rollers in order to replace formerly applied hard chromium platings. First AISI 316L coatings were sprayed in this application field and could provide a basically required corrosion resistance of respective rollers. However,wear resistance of AISI 316L coatings is rather poor leading to improvable coating lifetime. Two types of iron based hard alloy coatings with high content of chromium and boron are sprayed by kerosene fuel...