表面扩散合金化对ZM5镁合金冲蚀磨损性能的影响

摘要

Specimens of ZM5 magnesium alloy were dipped into the mixed powder of Al and Zn at (390±5) ℃ for 8 h in argon gas protective environment and subjected to surface diffusion alloying processing (SDAP).The erosion wear behaviors of ZM5magnesium alloy before and after SDAP were investigated in two different erosion wear environments:oil and quartz environment;tap water and quartz environment.The surfaces of erosion wear specimens exhibited cutting scratch grooves in the oil and quartz environment.Corrosive attack was weak and cutting wear mechanism was responsible for the mass loss.When the erosion wear medium was changed to tap water and quartz environment, corrosion pits and cracks were obviously observed after erosion wear test.The corrosion from tap water and the scour from quartz intensified mass losses.Compared with the untreated specimens,the application of SDAP improved the erosion wear resistance in the same environment.%将ZM5镁合金置入铝、锌混合粉末中,在氩气保护下,于温度(390±5)℃保温8h进行表面固态扩渗合金化处理.研究表面固态扩渗合金化处理前和处理后ZM5镁合金在两种不同冲蚀磨损环境中(油和石英砂,水和石英砂)的冲蚀磨损行为.结果表明:当冲蚀磨损介质为油和石英砂时,冲蚀磨损表面形貌为切削沟痕.油对试样的腐蚀很弱,切削磨损是主要的磨损机制.当冲蚀介质为水和石英砂时,冲蚀磨损试样表面为腐蚀坑和裂纹.水的腐蚀和石英砂的冲刷作用加剧试样的磨损质量损失.在相同的冲蚀介质中,经过表面固态扩渗合金化处理的试样的耐冲蚀磨损性能均比未经过表面固态扩渗合金化处理的试样好.