表面处理对金具耐磨特性影响研究

借助现代材料表征手段,通过研究渗铝钢、镀锌钢及金具黑件在不同摩擦磨损环境下的失重率、磨损形貌、表面硬度和磨损产物,揭示渗铝金具的耐磨机理。结果表明,随着载荷增加,渗铝钢失重量的增加率明显低于镀锌铝和金具黑件;3种试样磨损形貌分别呈现出剥落状、剥落状与撕裂状混合及纯撕裂状;热浸铝试样扩散退火后表面硬度达到640 HV,渗铝层厚度约为150μm;渗铝钢表面磨损后硬度随加载力的增加,同时渗铝钢镀层内有大量的铁、铝及其氧化物分别以Fe_2O_3和Al_2O_3的形式存在,从而使得渗铝钢的耐磨性优于其他二者。

Effect of Surface Treatment on Wear Resistance of Steel Fittings

The weight loss rate, wearing morphology, surface hardness of the aluminized steel, galvanized aluminum and fitting under the different friction and wear conditions were studied to reveal the wear resistance mechanism of the aluminized fitting. The results show that the weight loss rate of aluminized steel is significantly lower than that of galvanized aluminum and fittings with the increase of loading force. The wear morphologies of the three samples are spalling, a small amount of spalling and a large number of tearing, and tearing, respectively. The surface hardness of the hot dipped aluminum specimen, with an aluminizing layer of 150 μm, reach 640 HV, and the surface hardness of the aluminized steel decrease with the increase of the loading force. There are a large number of irons, aluminum and their oxides in the form of Fe2O3 and Al2O3in the coating of aluminized steel after wearing, respectively. The higher abrasion resistance of the coating of aluminized steel fitting is due to the protective effect of the Fe-Al alloy layer than the others.