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Adsorption orientation of sodium of polyaspartic acid effect on anodic films formed on magnesium alloy

机译：聚天冬氨酸钠的吸附取向对镁合金阳极氧化膜的影响

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摘要

We previously reported organic addition agent in improving the performance of anodic film formed on magnesium alloy. Here we report that the environment-friendly electrolyte with sodium of polyaspartic acid (PASP) affects the anodizing process including the microstructure, phase constituents and corrosion performance. We have used SEM, XRD, XPS and polarization curve to study in detail the electrolyte impact. Our results show that the anodic film in electrolyte with 19.2-28.8 g/L PASP is compact, smooth and high corrosion resistant. And also, increasing the PASP concentration ranging from 9.6 to 28.8 g/L results in enhancing the cell voltage, thickness and the content of compound including MgO and Mg_2Si0_4 in anodic film. Interestingly, the anodic film is non-stoichiometric oxide. Comparing with Tafel curves of the anodic film to the addition of PASP or not to, the corrosion current density is 1-2 magnitudes less than the later. Furthermore, a plausible model we propose that the anodizing process is regulated by two main plausible adsorption orientations of PASP at the surface anode. With the increasing of PASP content, the adsorption orientation may transit from "end-on" to "flat-on". This research using organic addition agent PASP may further broaden applications of organic additive in the anti-corrosion engineering and electrochemical surface treatment of magnesium alloy.
机译：我们先前曾报道有机添加剂可改善在镁合金上形成的阳极膜的性能。在这里我们报告说，聚天冬氨酸钠（PASP）与环境友好的电解质会影响阳极氧化过程，包括微观结构，相组成和腐蚀性能。我们已经使用SEM，XRD，XPS和极化曲线来详细研究电解质的影响。我们的结果表明，PASP为19.2-28.8 g / L的电解质中的阳极膜致密，光滑且具有高耐腐蚀性。而且，将PASP浓度从9.6增加到28.8g / L会导致电池电压，厚度和阳极膜中包括MgO和Mg_2SiO_4的化合物的含量增加。有趣的是，阳极膜是非化学计量的氧化物。与添加或不添加PASP的阳极膜的Tafel曲线相比，腐蚀电流密度比后者低1-2个数量级。此外，我们提出了一个可行的模型，即阳极氧化过程受表面阳极PASP的两个主要可能的吸附方向控制。随着PASP含量的增加，吸附方向可能会从“端到端”过渡到“端到端”。这项使用有机添加剂PASP的研究可以进一步拓宽有机添加剂在镁合金的防腐工程和电化学表面处理中的应用。

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  • 来源
    《Applied Surface Science》 |2011年第17期|p.7579-7585|共7页
  • 作者

    YuPing Liu; Dingfei Zhang; Changguo Chen; Jiangang Zhang; libo Cui;

  • 作者单位

    National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, PR China,College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China,College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China;

    National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, PR China,College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China;

    College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China;

    College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China;

    National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, PR China,College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    pasp; magnesium alloy; anodizing; corrosion; adsorption orientation;

    机译：asp镁合金阳极氧化腐蚀;吸附取向;

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