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通过球磨晶态Ti2Ni合金制备非晶态Ti2Ni合金,采用X射线衍射、充放电测试、阳极极化曲线对不同结构的Ti2Ni储氢合金的充放电特性及腐蚀行为进行研究。结果表明:晶态Ti2Ni合金的首次电化学充氢容量可达480mAh/g,但首次放氢量仅为充氢量的一半,合金内形成了大量不可逆氢化物相。随后的充放电循环中几乎没有不可逆相的形成。非晶相能够有效抑制充氢过程中不可逆相的形成,且充放氢使非晶合金间隙发生了弹性变形。此外,非晶结构使合金在碱性电解液中的自腐蚀电位升高、腐蚀电流降低,显著提高了合金的耐蚀能力。
The amorphous Ti2Ni alloy was prepared by ball milling of crystalline Ti2Ni alloy. The charge-discharge characteristics and corrosion behavior of Ti2Ni hydrogen storage alloys with different structures were investigated by X-ray diffraction, charge-discharge test and anodic polarization curves. The results show that the first electrochemical hydrogen storage capacity of crystalline Ti2Ni alloy can reach 480mAh / g, but the first hydrogen release capacity is only half of the hydrogen charging capacity, and a large amount of irreversible hydride phase is formed in the alloy. Subsequent charge and discharge cycles have almost no irreversible phase formation. The amorphous phase can effectively inhibit the formation of irreversible phase during hydrogen charging, and the amorphous alloy gap is elastically deformed by the charge-discharge of hydrogen. In addition, the amorphous structure of the alloy in the alkaline electrolyte in the corrosion potential increases, the corrosion current decreases, significantly improving the corrosion resistance of the alloy.