冲击载荷高应力条件下高铬铸铁湿态腐蚀磨损特性研究

WET CORROSIVE WEAR CHARACTERISTICS OF HIGH Cr CAST IRON SUBJECTED TO REPEATED IMPACT AND HIGH STRESS

在冲击载荷、高应力条件下,采用不同矿物组成,不同充气方式(N_2,空气、O_2)研究了高铬铸铁湿态腐蚀磨损特性。基本试验参数:冲击功1.47 J,矿浆浓度72％(矿石),矿浆温度28～30℃。本文讨论了磨料磨损与腐蚀磨损的定量关系,指出腐蚀磨损占总磨损的10～20％,湿磨硫化矿时,矿物中的硫化物促进了腐蚀磨损。探讨了高铬铸铁腐蚀磨损机理,指出碳化物周界腐蚀是碳化物早期剥落的根源所在,而碳化物的早期剥落是高铬铸铁湿态磨损增加的重要原因。

The corrosive wear characteristics of high Cr cast iron (HCCI) were studied under conditions of wet ore grinding. In this work the repeated impact and high stress were involved and different minerals and different modes of aeration(N2,Air, O2) were used. The principle test parameters were impact work of 1.47 J, slurry concentration of 72 % (ore) and slurry temperature of 28-30℃. The quantitative relationship between abrasive wear and corrosive wear was discussed. It is proposed that the corrosive wear is about 10-20 % of the total wear. The sulfide in mineral promotes corrosive wear in grinding sulfide ore. Finally, the corrosive wear mechanism of HCCI was investigated. It is pointed out that the corrosion of the carbide interface is the cause of carbide early spalling which is the main reason for wear increase of HCCI in wet ore grinding.