固溶处理对体育器材用(La+Yb)/ZL105合金耐腐蚀性能的影响

Effect of Solution Treatment on Corrosion Resistance of(La+Yb)/ZL105 Alloy for Sports Equipment

为提升体育器材用铝合金耐腐蚀性能,通过固溶处理制备了(La+Yb)/ZL105合金,利用OM、SEM、EDS、腐蚀失重和电化学测试技术研究分析了固溶温度对(La+Yb)/ZL105合金微观组织和耐腐蚀性能的影响。结果显示,固溶处理和混合稀土La+Yb的加入均能改善合金的微观组织,稀土相呈现不连续的针状。当固溶温度为520℃时,(La+Yb)/ZL105合金微观组织细化更明显,Si相呈现为颗粒状,富铁相呈现为小块状或颗粒状,腐蚀失重速率最小,腐蚀电位最大,腐蚀电流密度最小。当固溶温度过高时,合金组织粗化,发生过烧,出现微裂纹,使合金耐腐蚀性能降低。固溶处理(La+Yb)/ZL105合金耐腐蚀提升机理是细晶强化的作用。

In order to improve the corrosion resistance of aluminum alloy for sports equipment,the(La+Yb)/ZL105 alloy was prepared by solution treatment.The effects of solution temperature on the microstructure and corrosion resistance of the(La+Yb)/ZL105 alloy were studied and analyzed by OM,SEM,EDS,corrosion weight loss and electrochemical testing techniques.The results show that the solution treatment and the addition of mixed rare earth La+Yb can improve the microstructure of the alloy,and the rare earth phase presents discontinuous acicular shape.When the solution temperature was 520℃,the microstructure of the(La+Yb)/ZL105 alloy was refined more obviously,and the Si phase was granular,the Fe-rich phase was small or granular,the corrosion loss rate was the smallest,the corrosion potential was the largest,and the corrosion current density was the smallest.When the solution temperature was too high,the microstructure of the alloy was coarsened,overburning occurs,micro-cracks appear,and the corrosion resistance of the alloy was reduced.The mechanism of improving the corrosion resistance of the solution treated(La+Yb)/ZL105 alloy was the effect of fine grain strengthening.