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第二相Mg3Hg對Mg-5%Hg-1%Ga合金電化學(xué)性能的影響
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國防科工委資助項目（MKPT-02-181）


Influences of Secondary Phase Mg3Hg Compound on the Electrochemical Properties of the Mg-5%Hg-1%Ga Alloys
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    摘要:

    采用熔煉鑄造方法制備出Mg-5%Hg-1%Ga合金，在573~773 K時效不同時間，利用X射線物相檢測、掃描電鏡結(jié)合能譜分析第二相Mg3Hg的形貌和分布，用交流阻抗法等電化學(xué)方法研究Mg3Hg對Mg-5%Hg-1%Ga陽極在3.5%NaCl（質(zhì)量分?jǐn)?shù)）溶液中電化學(xué)性能的影響。結(jié)果表明：時效時間從15 min延長至200 h時，Mg-5%Hg-1%Ga合金中α-Mg和Mg3Hg的共晶組織轉(zhuǎn)變?yōu)棣?Mg基體中彌散分布Mg3Hg顆粒，這種轉(zhuǎn)變降低了濃差極化和法拉第反應(yīng)中電荷傳遞電阻，提高電化學(xué)活性。彌散分布的Mg3Hg顆粒使Mg-5%Hg-1%Ga合金組織均勻，提高了耐腐蝕性能。

    Abstract:

    The Mg-5%Hg-1%Ga alloy was prepared by melting-casting. Aging at 573-773 K for different time were carried out to ensure the fine dispersion of Mg3Hg compounds. Scanning electron microscopy (SEM), emission spectrometry (ESA) and X-ray diffraction (XRD) were employed to characterize the morphology and distribution of the secondary phase Ma3Hg. The electrochemical and corrosion behaviors of the alloy in 3.5wt% NaCl solution was studied by means of potentiodynamic, galvanostatic and electrochemical impedance spectroscopy (EIS) measurements. The relationship between the Mg3Hg compound and the electrochemical properties of the Mg-5%Hg-1%Ga alloy was discussed. The results demonstrate that when the aging time increases from 15 min to 200 h, the intergranular eutectic of α-Mg and Mg3Hg changes into dispersed Mg3Hg particles in α-Mg matrix. This transition increases electrochemical activity of Mg-5%Hg-1%Ga alloy due to the decreased concentration polarization and charge transfer resistance in the faradaic reaction. The electrochemical homogeneity of the microstructure increases the corrosion resistance of the Mg-5%Hg-1%Ga alloy.

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馮 艷,王日初,彭超群,王乃光.第二相Mg3Hg對Mg-5%Hg-1%Ga合金電化學(xué)性能的影響[J].稀有金屬材料與工程,2011,40(6):1010~1014.[Feng Yan, Wang Richu, Peng Chaoqun, Wang Naiguang. Influences of Secondary Phase Mg3Hg Compound on the Electrochemical Properties of the Mg-5%Hg-1%Ga Alloys[J]. Rare Metal Materials and Engineering,2011,40(6):1010~1014.]
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  • 收稿日期:2010-09-15
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