(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083；
2. 長(zhǎng)沙礦冶研究院，長(zhǎng)沙 410012)
摘 要: 采用感應(yīng)熔煉法制備Mg-6%Al-5%Pb(質(zhì)量分?jǐn)?shù))陽(yáng)極材料，采用電化學(xué)法和化學(xué)浸泡法研究熱處理對(duì)其電化學(xué)性能及腐蝕行為的影響，采用掃描電鏡對(duì)其不同熱處理狀態(tài)下陽(yáng)極材料的顯微組織及腐蝕表面形貌進(jìn)行觀察。結(jié)果表明：Mg-6%Al-5%Pb陽(yáng)極試樣經(jīng)100 ℃時(shí)效8 h處理后Al和Pb彌散分布在鎂基體中，其穩(wěn)定電位為−1.455 V(相對(duì)于標(biāo)準(zhǔn)氫電極)，腐蝕電流密度為0.063 mA/cm2，平均析氫速率為0.8 mL/(cm2·h)，表現(xiàn)出較好的綜合性能；Mg-6%Al-5%Pb陽(yáng)極的析氫在達(dá)到穩(wěn)態(tài)之前存在孕育期，在孕育期內(nèi)析氫速率較小，達(dá)到穩(wěn)態(tài)以后析氫速率增大，直至趨于恒定。
關(guān)鍵字: 鎂陽(yáng)極；熱處理；電化學(xué)性能；析氫行為
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Changsha Research Institute of Mining and Metallurgy, Changsha 410012, China）
Abstract:Mg-6%Al-5%Pb (mass fraction) anode material was prepared by the induction melting protected by argon. The electrochemical performances and corrosion behaviors of the anode specimens under different heat treatment conditions were studied by electrochemical measurements and immersion tests. The microstructures and the corroded surfaces of the anode specimens were examined by SEM. The results show that Mg-6%Al-5%Pb anode specimen aged at 100 ℃ for 8 h has the optimal performance with the stable potential of −1.455 V (vs SHE), corrosion current density of 0.063 mA/cm2 and average rate of hydrogen evolution of 0.8 mL/(cm2·h). There is an incubation period to the corrosion onset of Mg-6%Al-5%Pb anode, during which the hydrogen evolution rate is small. For long time immersion, the hydrogen evolution rate becomes linear and the process of corrosion achieves steady state.
Key words: magnesium anode; heat treatment; electrochemical performances; hydrogen evolution behavior
