ZM5镁合金表面高能微弧沉积ZL301铝合金的研究

Deposition of ZL301 Alloy on ZM5 Magnesium Alloy by High-Energy Micro-Arc Process

使用高能微弧火花沉积机在ZM 5镁合金表面上沉积ZL30 1合金。对沉积层进行了金相观察、线扫描分析、显微硬度测试、电化学测试和腐蚀形貌的观察。结果表明 ,沉积层和基材为冶金结合。XRD物相分析表明 ,镁合金基材主要由α Mg和 β Mg17Al12 组成 ,而沉积层由α Mg ,Al2 Mg和β Mg17Al12 组成 ,沉积层显微硬度最高可达 2 2 0HV。极化曲线测试出现 3个腐蚀电位 ,即活化区、钝化区和活化 钝化过渡区。结果说明高能微弧火花沉积显著提高了ZM 5镁合金的耐腐蚀性。

Deposition ZL301 on ZM5 magnesium alloy surface by high energy micro arc process was performed.The deposition zone was observed by optical microscope,linescanning by EPMA was carried out.Microhardness,electrochemical test and corroded surface morphology observation were also performed.The results show that the fusion zone is metallurgical bonding.XRD results indicate that ZM5 alloy substrate consists mainly of α Mg and β Mg 17 Al 12 ,while the deposition layer consists of α Mg,Al 2Mg and β Mg 17 Al 12 .The maximum microhardness of the deposition layer can be as high as 220HV.Three corrosion potential existed in polarization curve,including active zone,passive zone and active passive zone.The corrosion resistance of ZM5 alloy is remarkably enhanced by means of high energy micro arc deposition.