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GW93鎂合金表面錫酸鹽化學轉(zhuǎn)化膜工藝研究
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國家自然科學基金（51201120）；陜西省光電功能材料與器件重點實驗室開放基金（ZSKJ201304）；西安工業(yè)大學校長基金（XAGDXJJ2010008）


Stannate Chemical Conversion Coating on the Surface of GW93 Magnesium Alloy
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    摘要:

    以錫酸鈉為轉(zhuǎn)化液主要成分對Mg-8.8Gd-3.1Y-0.6Zn-0.5Zr (GW93) 鎂合金進行無鉻化學轉(zhuǎn)化表面處理，通過全浸法評價轉(zhuǎn)化膜在pH為中性的3.5%NaCl（質(zhì)量分數(shù)）溶液中的腐蝕性能，利用光學顯微鏡、X射線衍射儀和掃描電子顯微鏡分析轉(zhuǎn)化膜的微觀形貌和相組成。結(jié)果表明，適用于GW93鎂合金的錫酸鹽轉(zhuǎn)化膜的最佳工藝條件為：錫酸鈉50 g/L，焦磷酸鈉50 g/L，乙酸鈉15 g/L，氫氧化鈉5 g/L，檸檬酸3 g/L，碳酸鈉20 g/L，轉(zhuǎn)化溫度80 ℃，轉(zhuǎn)化時間15 min。轉(zhuǎn)化膜主要組成為MgSnO3·3H2O。該工藝下形成的膜層為細小的、近球狀顆粒堆積而成，表面均勻平整。腐蝕性能評價結(jié)果表明，未經(jīng)錫酸鹽化學轉(zhuǎn)化的鎂合金的平均腐蝕速率為6.1083 g·a-1·cm-2，經(jīng)最佳化學轉(zhuǎn)化成膜工藝處理后，該鎂合金的平均腐蝕速率為0.1264 g·a-1·cm-2。抗腐蝕性能被提高了97.9%，說明該錫酸鹽化學轉(zhuǎn)化膜層可以有效地提高鎂合金的耐腐蝕性能。

    Abstract:

    A chrome-free chemical conversion process using sodium stannate as the main component was investigated for corrosion protection of Mg-8.8Gd-3.1Y-0.6Zn-0.5Zr magnesium alloy (GW93). Corrosion property of the specimens with and without chemical conversion film was evaluated by full immersion test in neutral 3.5wt% NaCl solution. The microstructure and phase composition of the chemical conversion film were analyzed by optical microscope, X-ray diffraction meter and scanning electron microscope. The results show that the optimum chemical conversion processing for GW93 magnesium alloy is Na2SnO3 50 g/L, Na4P2O7 50 g/L, NaOH 5 g/L, CH3COONa 15 g/L, citric acid 3 g/L and sodium carbonate 20 g/L at 80 oC for 15 min. Mg-8.8Gd-3.1Y-0.6Zn-0.5Zr is covered by uniform chemical conversion coating composed of MgSnO3·3H2O. The immersion test shows that the average corrosion rate of the specimen without chemical conversion treatment is 6.1083 g·a-1·cm-2, and that of the specimens with chemical conversion treatment is 0.1264 g·a-1·cm-2. Corrosion resistance is improved by 97.9%, which suggests that stannate chemical conversion treatment could provide effective corrosion protection for GW93 magnesium alloy.

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王建利,王 萍,郭永春,楊 忠,李建平. GW93鎂合金表面錫酸鹽化學轉(zhuǎn)化膜工藝研究[J].稀有金屬材料與工程,2014,43(6):1397~1402.[Wang Jianli, Wang Ping, Guo Yongchun, Yang Zhong, Li Jianping. Stannate Chemical Conversion Coating on the Surface of GW93 Magnesium Alloy[J]. Rare Metal Materials and Engineering,2014,43(6):1397~1402.]
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  • 收稿日期:2013-10-21
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  • 在線發(fā)布日期: 2014-11-13
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