(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 對鎂合金熱軋板材在不同溫度進(jìn)行退火處理，采用恒電流掃描法、動電位極化掃描法和浸泡法研究不同退火溫度對其在3.5%(質(zhì)量分?jǐn)?shù))NaCl中的電化學(xué)性能和自腐蝕性能的影響；采用光學(xué)顯微鏡、掃描電鏡和X射線衍射儀對其顯微組織和腐蝕形貌進(jìn)行觀察。結(jié)果表明：鎂合金陽極板材在退火過程中發(fā)生靜態(tài)再結(jié)晶，經(jīng)250 ℃、300 ℃退火1 h，合金板材發(fā)生完全再結(jié)晶；經(jīng)300 ℃退火1 h后，鎂合金陽極板材的電化學(xué)活性最好，放電穩(wěn)定電位達(dá)−1.654 V(vs SCE)，但其耐蝕性能最差，腐蝕電流密度為180.38 μA/cm2。
關(guān)鍵字: 鎂合金陽極；熱軋；退火；微觀組織；電化學(xué)性能
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Annealing treatment was carried out on the hot-rolled magnesium alloy anode sheet at different temperatures. The effects of different annealing temperatures on the electrochemical and self-corrosion behavior of magnesium alloy anode were investigated by galvanostatic tests, potentiodynamic plorization and immersion tests in 3.5% (mass fraction) NaCl. The microstructure and the corroded surface of the experimental specimens were observed by optical microscopy, scanning electron microscopy and X-ray diffractometry. The results show that static recrystallization occurs during the annealing treatment, the magnesium alloy sheet shows completely recrystallized microstructure after being annealed at 250 and 300 ℃ for 1 h. After being annealed 300 ℃ for 1 h, the magnesium alloy sheet has the best electrochemical activity, whose discharge electrode potential can be up to −1.654 V(vs SCE), but its corrosion resistance is the worst and the corrosion current density is 180.38 μA/cm2.
Key words: magnesium alloy anode; hot rolling; annealing; microstructure; electrochemical property
