含铈半固态ZL105合金组织及耐腐蚀性能研究  

Study on the Microstructure and Corrosion Resistance of Semi-Solid ZL105 Alloy Containing Ce

作　　者：马路路 张莉 张南洋 MA Lu-lu;ZHANG Li;ZHANG Nan-yang(School of Mechanical Engineering,Jiangsu College of Safety Technology,Xuzhou 221000,Jiangsu,China)

机构地区：[1]江苏安全技术职业学院机械工程学院,江苏徐州221000

出　　处：《铸造》2024年第7期955-961,共7页Foundry

摘　　要：通过光学显微镜、扫描电子显微镜、能谱分析仪、显微硬度测试、盐溶液浸泡腐蚀及电化学工作站等分析测试方法研究了不同稀土铈添加量对半固态ZL105合金微观组织形貌及耐腐蚀性能的影响。研究结果表明:随着稀土铈含量的不断提高,ZL105合金组织内的初生α-Al相的尺寸逐渐缩小;当铈的含量为0.6%时,合金中初生α-Al相晶粒尺寸为65.77μm,晶粒平均形状因子为0.74,与不添加稀土铈的ZL105合金相比α-Al相晶粒尺寸(115.37μm)降低了42.99%,晶粒平均形状因子(0.42)提高了76.19%。与不含稀土铈的ZL105合金相比,添加了0.6%稀土铈的合金维氏硬度提高了31.64%。稀土铈的添加也大幅提高了合金的耐腐蚀性能,铈的含量为0.6%时合金的失重腐蚀速率为10.85 mg·cm^(-2)·d^(-1),相比于不含稀土铈的合金降低了50.93%,合金的腐蚀电位有所增大并且腐蚀电流密度有所减小。通过腐蚀表面形貌观察可知添加稀土铈的合金的腐蚀凹坑及腐蚀裂纹明显减少,腐蚀表面逐渐变得平整且光滑,腐蚀形貌得到了极好的改善。The effects of different amounts of rare earth cerium on the microstructure and corrosion resistance of semi-solid ZL105 alloy were investigated by optical microscope,scanning electron microscope,energy spectrum analyzer,microhardness test,salt solution immersion corrosion and electrochemical workstation.The results showed that:with the increasing of the content of rare earth and cerium,the sizes of the primaryα-Al phases in ZL105 alloy decreased gradually.When the content of cerium was 0.6%,the grain size of the primaryα-Al phase in ZL105 alloy was 65.77μm and the average grain shape factor was 0.74.Compared with ZL105 alloy without Ce,the grain size(115.37μm)of theα-Al phase decreased by 42.99%,and the average grain shape factor increased by 76.19%(0.42).Compared with ZL105 alloy without cerium,the hardness of ZL105 alloy with 0.6%cerium increased by 31.64%.The addition of rare earth cerium also greatly improved the corrosion resistance of the alloy.When the content of cerium was 0.6%,the corrosion rate of the alloy was 10.85 mg·cm^(-2)·d^(-1),which was 50.93%lower than that of the alloy without rare earth cerium.The corrosion potential of the alloy was increased and the corrosion current density was decreased.According to the observation of the corrosion surface morphology,the corrosion pits and cracks of the alloy added with rare earth cerium were obviously reduced,and the corrosion surface gradually became flat and smooth,and the corrosion morphology was greatly improved.

关 键 词：稀土铈 半固态ZL105合金 微观组织 显微硬度 耐腐蚀性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]