铜矿湿磨用球磨机合金钢衬板的腐蚀磨损失效分析

Corrosion-wear Failure Analysis of Wet-grinding Ball Mill Liner in the Slurry of Copper Mine

针对铜矿湿磨工况下球磨机衬板的失效行为进行了研究。采用光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)及显微硬度仪等分析了服役Cr合金钢衬板的组织形貌,结合电化学测试手段及拉伸、冲击试验,分析了其在该工况下的耐蚀性及力学性能,并讨论了在弱酸工况中的腐蚀磨损机理。结果表明,衬板材料在模拟铜矿浆中具有良好的耐蚀性,而服役工况下的动态冲击磨损会降低材料的耐蚀性能。切削犁沟、腐蚀坑和剥落坑是衬板损伤的主要形式,腐蚀磨损的交互作用是导致衬板失效的主要原因。

The failure behavior of ball mill liner in copper mine under wet grinding conditions was ana lyzed. The microstructure of failure lining plate was analyzed by optical microscope, scanning electron microscope, energy dispersive spectroscope, hardness tester and other analysis methods. The corrosion resistance, mechanical properties and corrosive wear mechanism of the Cr-alloy steel in weak acid condi- tion have also been characterized by electro-chemical polarization, tensile and impacting testing. The re- sult shows that the liner material presents the satisfied corrosion resistance in the static simulation cop- per slurry. However, the dynamic impact wear of copper mine slurry greatly reduces the corrosion re- sistance of the material. Failure modes of lining plates are characterized by cutting furrows, corrosion pits and peeling pits, and the interaction of corrosion and wear is responsible for liner failure.