(1. 浙江大學(xué) 材料系, 杭州 310027;
2. 大連海事大學(xué) 金屬材料工藝所, 大連116026)
摘 要: 通過(guò)電化學(xué)實(shí)驗(yàn)方法以及Miedema理論模型計(jì)算分別獲得了MgNi非晶合金的吸氫形成焓ΔH，兩者對(duì)比較為接近，說(shuō)明該模型可被用于估算非晶合金的吸氫形成焓。對(duì)形成焓隨Ni含量的變化趨勢(shì)進(jìn)行了研究，結(jié)果表明，當(dāng)Ni含量(摩爾分?jǐn)?shù))高于55%時(shí)，合金吸氫穩(wěn)定性隨Ni含量的增加而升高；而當(dāng)Ni含量低于55%時(shí)，穩(wěn)定性的改變恰好相反。此外還分析了這種變化趨勢(shì)對(duì)MgNi非晶合金電極的自放電特性的影響，結(jié)果表明，吸氫形成焓越負(fù)的合金，其自放電效應(yīng)越弱。
關(guān)鍵字: MgNi非晶合金； 吸氫形成焓；自放電特性
（1. Department of Materials Science， Zhejiang University，Hangzhou 310027, P.R.China;
2. Institute of Materials Science and Technology， Dalian Maritime University，Dalian 116026, P.R.China）
Abstract:The hydrogen absorption enthalpies of MgNi amorphous alloys were determined by means of electrochemical test and compared with those obtained by mathematical evaluation according to Miedema's model. The values werefound agreed well. The result demonstrates that the model can be used in theevaluation of the hydrogen absorption enthalpies of amorphous alloys. Through investigating the enthalpies varied with Ni content， it can be concluded that thealloys hydrogen absorption stability increases with the Ni content increasing when Ni content(mole fraction) is higher than 55%， and the change is on the contrary when Ni content(mole fraction) is less than 55%. The effect of Ni content on the selfdischarge properties of amorphous MgNi electrodes was also examined. The result shows that the more negative the ΔH value is， the less the selfdischarge.
Key words: MgNi amorphous alloys； hydrogen absorption enthalpy; selfdischarge property
