【摘要】 选用非晶态的Mg0.9Ti0.1Ni0.85Co0.15合金粉末与石墨粉及镍粉进行球磨表面包覆。SEM分析结果表明,己包覆石墨和镍粉的合金表面上吸附着一层小的颗粒,形成薄层将原来的合金表面包覆起来。使用XPS分析了合金表面元素。结果表明,包覆石墨粉后,合金表面碳元素的质量分数和原子分数均增加,Mg的质量分数从22.74%减小至22.23%,原子分数从36.43%减小到32.94%,从而减小了Mg在碱液中的腐蚀几率,提高合金的抗腐蚀性能;包覆镍粉后,合金表面Ni的质量分数由59.89%增加到60.04%,原子分数由40.63%增加到41.02%,形成合金表面富Ni的保护层,提高了合金的抗腐蚀性能。充放电循环测试表明,循环30周后,包覆石墨粉的合金电极容量保持率为32.05%,包覆镍粉的合金电极容量保持率为41.26%,而未包覆的电极容量保持率仅为17.88%。合金电极极化曲线测试结果表明,石墨或镍粉的包覆提高了Mg0.9Ti0.1Ni0.85Co0.15合金电极的循环稳定性和在KOH碱液中的抗腐蚀性能。更多还原

【Abstract】 Amorphous Mg0.9Ti0.1Ni0.85Co0.15 alloy was coated with graphite and nickel powder by ball milling.SEM indicated that there was a graphite or nickel thin layer on the surface of the alloy.X-ray energy spectrum analysis showed that after coated with graphite powder,the C content at the surface of the alloy increased,and the mass and atomic contents of Mg decreased from 22.74% to 22.23%,and from 36.43% to 32.94%,respectively,which decreased the corrosion probability of Mg in alkali solution;after coated with nickel powder,the mass and atomic contents of Ni at the surface of the alloy increased from 59.89% to 60.04%,and from 40.63% to 41.02%,respectively, which indicted that a nickel-riched layer was formed.This nickel-riched layer can protect the alloy from corrosion in alkali solution.Charge-discharge cycle tests showed that after 30 charge-discharge cycles,the capacity retained for the graphite coated alloy,the nickel coated alloy,and the uncoated alloy was 32.05%,41.26% and 17.88%,respectively.This indicates the graphite coating and the nickel powder coating can increase the cycle stability.Polarization curves showed the antico-rrosion characteristic of the Mg0.9Ti0.1Ni0.85Co0.15 alloy electrode in KOH solution was improved by graphite or nickel coated.更多还原