分步锻压对汽车用AZ80镁合金耐蚀及耐磨性能的影响

Effect of step forging on corrosion resistance and wear resistance properties of AZ80 magnesium alloy for automobile

为了探究分步锻压对汽车用AZ80镁合金耐蚀及耐磨性能的影响,对均匀化处理后的AZ80镁合金分别进行了高应变速率(4×10^(-1)s^(-1))下的一次锻压处理、先低应变速率(4×10^(-3)s^(-1))后高应变速率(4×10^(-1)s^(-1))的分步锻压处理,并与锻压前试样进行了显微组织、耐蚀性能和耐磨性能的对比分析。结果表明:在组织细化、耐蚀及耐磨性能的改善方面,分步锻压的效果优于一次锻压。与锻压前试样相比,一次锻压可使腐蚀电位减小1.58%、腐蚀电流密度减小2.77%、500 N外加载荷条件下的磨损体积减小25.00%,分步锻压则可使腐蚀电位减小5.83%、腐蚀电流密度减小7.03%、500 N外加载荷下的磨损体积减小54.64%。分步锻压处理是改善汽车用AZ80镁合金耐蚀及耐磨性能的有效途径。

In order to explore the influences of step forging on the corrosion resistance and wear resistance properties of AZ80 magnesium alloy for automobile, the homogenized AZ80 magnesium alloys were processed by the one time forging treatment at a high strain rate of 4×10^(-1)s^(-1)and the step forging treatment first at a low strain rate of 4×10^(-3)s^(-1)and then at a high strain rate of 4×10^(-3)s^(-1). Then, compared with the samples before forging, the microstructure, corrosion resistance property and wear resistance property of samples were compared and analyzed. The results show that the effect of step forging is better than that of one-time forging in terms of microstructure refinement, corrosion resistance and wear resistance improvement. Compared with the sample before forging, the one-time forging can reduce the corrosion potential by 1.58%, the corrosion current density by 2.77%, and the wear volume under the applied load condition of 500 N by 25.00%. The step forging can reduce the corrosion potential by 5.83%, the corrosion current density by 7.03%, and the wear volume under the applied load condition of 500 N by 54.64%. Thus, the step forging treatment is an effective way to improve the corrosion resistance and wear resistance properties of AZ80 magnesium alloy for automobile.