(1. 上海交通大學(xué) 材料科學(xué)與工程學(xué)院 上海市鎂材料及應(yīng)用工程技術(shù)研究中心，上海 200240；
2. 上海交通大學(xué) 材料科學(xué)與工程學(xué)院 金屬基復(fù)合材料國家重點(diǎn)實(shí)驗(yàn)室，上海 200240)
摘 要: 采用恒溫浸泡、交流阻抗和極化曲線法分別研究鑄態(tài)(F)和固溶態(tài)(T4)的NZ30K以及擠壓態(tài)AZ31鎂合金在不同濃度MgCl2、MgSO4、Mg(COOCH3)2、MgBr2溶液中的腐蝕行為和電化學(xué)性能。結(jié)果表明：隨著電解液中電解質(zhì)濃度的增加，3種鎂合金的自腐蝕速率均增大。F態(tài)和T4態(tài)的NZ30K合金在MgSO4溶液中腐蝕速率最快，在MgBr2溶液中耐蝕性能最好，而AZ31合金在MgCl2溶液中耐蝕性能最差，在MgSO4和Mg(COOCH3)2中具有較好的耐蝕性能。電化學(xué)阻抗譜(EIS)結(jié)果表明：在4種電解液中，鎂合金的高頻端容抗環(huán)半徑均隨著電解質(zhì)濃度的增加而減小，這與恒溫浸泡的實(shí)驗(yàn)結(jié)果相吻合。
關(guān)鍵字: AZ31合金；NZ30K合金；腐蝕行為；電化學(xué)性能
anode materials for magnesium battery
（1. Shanghai Engineering Research Centre of Magnesium Materials and Application,
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Key State Laboratory of Metal Matrix Composite, School of Materials Science and Engineering,
Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:The corrosion behavior and the electrochemical performance of NZ30K alloy of as-cast(F) and solution-treatment conditions(T4), and AZ31 alloy of as-extruded condition were investigated in MgCl2, MgSO4, Mg(COOCH3)2 and MgBr2 solution with different molar concentrations by means of immersion test at constant temperature, alternating current impedance and polarization curve. The results show that the corrosion rates of three kinds of Mg alloys increase with the increase of the electrolyte concentration. The corrosion rate of NZ30K alloy in F and T4 conditions in MgSO4 solution is the highest, and that in MgBr2 solution among the researched electrolytes is the lowest. Whereas, AZ31 alloy shows the worst corrosion resistance in MgCl2 solution and the best corrosion resistance in MgSO4 and Mg(COOCH3)2 solution. The results of electrochemical impedance spectroscopy(EIS) show that radius of high frequency capacitive loop of Mg alloys decreases with the increase of the electrolyte concentration, which is consistent with the results of immersion test at constant temperature.
Key words: AZ31 alloy; NZ30K alloy; corrosion behavior; electrochemical performance
