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大氣下純鎂表面擴(kuò)散鋅釔滲層組織和性能
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太原市明星專項(xiàng)基金 (09121002)；山西省青年科技研究基金 (2008021033)；山西省歸國留學(xué)基金 (2007-25)


Study of Microstructure and Property of Zinc-Yttrium Coating on Pure Magnesium by Atmosphere Solid Diffusion
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    大氣下采用固態(tài)擴(kuò)散鋅釔共滲的方法，在390 ℃對純鎂進(jìn)行表面合金化改性處理。采用OM、SEM、EDS、XRD和顯微硬度、電化學(xué)腐蝕極化曲線測試等方法分析滲層的組織結(jié)構(gòu)、顯微硬度和耐蝕性能。結(jié)果表明，經(jīng)表面合金化處理，在純鎂表面獲得了致密的滲層，厚約900 μm。滲層由過渡層和合金反應(yīng)層兩部分組成，過渡層是α-Mg固溶體，合金反應(yīng)層由大量的Mg7Zn3和α-Mg固溶體及α-Mg和MgZn片層狀共晶組織組成，材料表層的顯微硬度有很大提高，平均硬度約為純鎂的4倍，自腐蝕電位比純鎂正移87 mV，自腐蝕電流密度降低了約1個數(shù)量級，耐腐蝕性能明顯改善

    Abstract:

    The surface modification treatment on pure magnesium was conducted at 390 ℃ by atmosphere solid zinc-yttrium co-diffusing. The microstructure, the microhardness and the corrosion resistance of the diffusing layer were investigated with optical microscope, SEM, EDS, XRD, microhardness test and the electrochemical corrosion polarization curves test. The results show that the dense diffusing layer with an thickness of 900 μm has formed on the surface of pure magnesium after surface modification treatment. The diffusion layer contains a transition layer and an alloy reaction layer. The transition layer is α-Mg solid solution. The alloy reaction layer contains a plenty of Mg7Zn3, α-Mg solid solution and α-Mg+MgZn lamellar eutectic structure. The microhardness of the surface diffusion alloying layer increases significantly. The average microhardness is about 4 times higher than that of magnesium matrix. The open circuit potential of the alloyed specimen increases by 87 mV. The corrosion current density of alloyed specimen decreases by one order of magnitude. Its corrosion resistance is improved obviously

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郭玉玲,王紅霞,梁 偉,聶建航,趙興國.大氣下純鎂表面擴(kuò)散鋅釔滲層組織和性能[J].稀有金屬材料與工程,2012,41(4):623~626.[Guo Yuling, Wang Hongxia, Liang Wei, Nie Jianhang, Zhao Xingguo. Study of Microstructure and Property of Zinc-Yttrium Coating on Pure Magnesium by Atmosphere Solid Diffusion[J]. Rare Metal Materials and Engineering,2012,41(4):623~626.]
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  • 收稿日期:2011-04-01
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