【摘要】：采用熔煉鑄造和塑性變形方法制備Mg-Al-Pb-La鎂合金。采用掃描電鏡和X射線衍射等方法研究軋制對(duì)Mg-Al-Pb-La鎂合金顯微組織的影響,采用動(dòng)電位極化和恒電流放電等方法研究軋制對(duì)Mg-Al-Pb-La鎂合金腐蝕電化學(xué)行為的影響。結(jié)果表明:軋制使Mg-Al-Pb-La鎂合金的晶粒細(xì)化、第二相破碎、再結(jié)晶程度降低、Mg-Al-Pb-La鎂合金的放電活性增強(qiáng)、耐蝕性變差和陽極效率降低;當(dāng)軋制變形量為40%時(shí),鎂合金的綜合放電性能優(yōu)良,在電流密度180 m A/cm~2下平均放電電位和陽極效率分別為-1.749 V(vs SCE)和(82.9±0.2)%。
[Abstract]:Mg-Al-Pb-La magnesium alloys were prepared by melting casting and plastic deformation. The effect of rolling on the microstructure of Mg-Al-Pb-La magnesium alloy was studied by means of scanning electron microscope (SEM) and X-ray diffraction (XRD). The effect of rolling on corrosion electrochemical behavior of Mg-Al-Pb-La magnesium alloy was studied by means of potentiodynamic polarization and constant current discharge. The results show that the grain size of Mg-Al-Pb-La magnesium alloy is refined, the second phase is broken, the degree of recrystallization is decreased, the discharge activity of Mg-Al-Pb-La magnesium alloy is decreased, the corrosion resistance of Mg-Al-Pb-La magnesium alloy is improved, and the anode efficiency is decreased when the rolling deformation is 40%. The average discharge potential and anodic efficiency at the current density of 180m A/cm~2 are -1.749 V (vs SCE) and (82.9 鹵0.2), respectively.
【作者單位】： 中南大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：湖南省自然科學(xué)基金資助項(xiàng)目(2016JJ2147)~~
【分類號(hào)】：TG178;TG339
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本文編號(hào)：2231753