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AZ31鎂合金表面聚吡咯-鉬酸鹽膜的腐蝕性能
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超輕材料與表面技術(shù)教育部重點(diǎn)實(shí)驗(yàn),超輕材料與表面技術(shù)教育部重點(diǎn)實(shí)驗(yàn),超輕材料與表面技術(shù)教育部重點(diǎn)實(shí)驗(yàn),超輕材料與表面技術(shù)教育部重點(diǎn)實(shí)驗(yàn)

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國(guó)家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）（51305090, 51479037），黑龍江省自然科學(xué)基金B(yǎng)201317


Corrosion Properties of the Polypyrrole-molybdate Film Electro-polymerized on the AZ31 Mg Alloy
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Key Laboratory of Superlight Materials Surface Technology,Ministry of Education,Harbin Engineering University,Harbin,150001,Key Laboratory of Superlight Materials Surface Technology,Ministry of Education,Harbin Engineering University,Harbin,150001,Key Laboratory of Superlight Materials Surface Technology,Ministry of Education,Harbin Engineering University,Harbin,150001,Key Laboratory of Superlight Materials Surface Technology,Ministry of Education,Harbin Engineering University,Harbin,150001

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    摘要:

    在水楊酸鈉溶液中采用循環(huán)伏安法在AZ31鎂合金表面分別電聚合聚吡咯(PPy)膜和聚吡咯-鉬酸根膜(PPy-MoO42-)。利用掃描電子顯微鏡（SEM）觀測(cè)PPy膜和PPy-MoO42-膜層腐蝕前后的表面形貌，衰減全反射紅外光譜（ATR-IR）反映了PPy膜和PPy-MoO42-膜的特征吸收峰，研究了MoO42-的存在對(duì)PPy特征吸收峰的影響。使用四探針?lè)y(cè)量薄膜的表面電阻；采用開路電位（OCP），電化學(xué)交流阻抗譜（EIS）和動(dòng)電位極化曲線測(cè)試PPy膜和PPy-MoO42-膜在3.5%NaCl溶液中浸泡12h后的耐腐蝕性能。結(jié)果顯示，PPy-MoO42-膜層更緊湊，PPy-MoO42-膜層的腐蝕電流密度比PPy膜的低三個(gè)數(shù)量級(jí)。鉬酸根的存在使得PPy-MoO42-膜的表面電阻比PPy膜小，且PPy-MoO42-膜的耐腐蝕性能較好。

    Abstract:

    The polypyrrole (PPy) coating and polypyrrole-molybdate (PPy-MoO42-) coating were electro-polymerized in sodium salicylate solution by using cyclic voltammetry (CV) on the AZ31 Mg alloy surface. Surface morphology of PPy coating and PPy-MoO42- coating on Mg alloy surface before and after being corrupted was observed by scanning electron microscopy (SEM). Attenuated total reflection-infrared (ATR-IR) spectra showed the characteristic ring stretching peaks of the PPy coating and PPy-MoO42- coating, and also revealed the influence of MoO42- on the characteristic ring stretching peaks for PPy. The surface resistance was measured by four-point probe method. The open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization analyzed the corrosion resistance performance of PPy coating and PPy-MoO42- coating on the Mg alloy surface in 3.5 % NaCl solution for 12 h. The results showed that the surface morphology of PPy-MoO42- coating is compact. And the corrosion current density of PPy-MoO42- coating is three orders lower than the PPy coating, the PPy-MoO42- coating on the Mg alloy surface had better corrosion resistance and smaller surface resistance than the PPy coating because of the existence of the molybdate ion.

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王桂香,曹娜娜,喬英杰,張曉紅. AZ31鎂合金表面聚吡咯-鉬酸鹽膜的腐蝕性能[J].稀有金屬材料與工程,2017,46(6):1480~1485.[Guixiang Wang, Nana Cao, Yingjie Qiao, Xiaohong Zhang. Corrosion Properties of the Polypyrrole-molybdate Film Electro-polymerized on the AZ31 Mg Alloy[J]. Rare Metal Materials and Engineering,2017,46(6):1480~1485.]
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  • 收稿日期:2015-04-02
  • 最后修改日期:2016-02-04
  • 錄用日期:2016-03-30
  • 在線發(fā)布日期: 2017-11-07
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