釩酸根對 AZ31 和 AZ91 鎂合金硝酸鈰化成皮膜結構與性質之影響

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doi:10.6342/NTU.2013.01382

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钒酸根对 AZ31 和 AZ91 镁合金硝酸铈化成皮膜结构与性质之影响

Influence of Vanadate Additive on the Structure and Properties of Cerium Conversion Coatings on AZ31 and AZ91 Magnesium Alloys

罗文昕 , 硕士　　导师：林招松　　

繁体中文 DOI： 10.6342/NTU.2013.01382

AZ31 镁合金； AZ91 镁合金；铈盐化成处理；钒酸盐化成处理；抗蚀性； AZ31 magnesium alloys ； AZ91 magnesium alloys ； cerium conversion coating ； vanadate conversion coating ； corrosion resistance

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摘要 │ 参考文献 (70) │ 国际计量

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Magnesium-based alloys have attracted many attentions these years because of their outstanding properties. However, the inadequate corrosion resistance limits the application of magnesium and its alloys. Many studies have established the feasibility of the conversion coating of rare earth metal salts on Mg alloys. Especially, the characteristic of inhibition of metal corrosion by cerium salt extends the research interest in the field of conversion coating. However, a long period of conversion time is necesssary to from a cerium conversion coating. Although adding H2O2 accelerates the conversion rate, the excess hydrogen evolution leads to the blisters on the coating, which has a blister area of 58 %. The present study adds metavanadate into cerium-based conversion solution in order to obtain a conversion coating with dense structure for improved adhesion and corrosion resistance. The analyses of microstructure observations, EIS and salt spray test are conducted to investigate the conversion coating on AZ31 and AZ91.
      The results indicate the conversion solution containing metavanadate produces a thin bilayered coating without blisters on Mg alloys. The corrosion resistance is improved significantly. Moreover, increasing the concentration of metavanadate promotes the influence of vanadate on the properties of the conversion coating. Furthermore, this work adjusts the pH value of metavanadate solution prior to the addition to the conversion solution, for improving the stability of conversion solution. Adding the solution of metavanadate with pH 2.8-2.9, the conversion coating exhibits good corrosion resistance within short conversion times. Meanwhile, the formation of defect is inhibited. The surface defects area can be reduced to 36 %, and the size of each blister becomes much smaller. The present study compares the different cerium-based conversion coatings with adding metavanadate. Finally, the mechanisms of conversion and defect formation are discussed in details.

参考文献 ( 70 ) 〈TOP〉

1. S. Mathieu, C. Rapin, J. Steinmetza and P. Steinmetz, “A Corrosion Study of the Main Constituent Phases of AZ91 Magnesium Alloys,” Corros. Sci., 45, 2741-2755 (2003)
连结：
2. C. H. Caceres, C. J. Davidson, J. R. Griffiths and C. L. Newton, “Effects of solidification rate and ageing on the microstructure and mechanical proper AZ91 alloy,” Mater. Sci. Eng., A325, 344-355 (2002)
连结：
3. J. E. Gray and B. Luan, “Protective Coatings on Magnesium and its alloys- a critical Review,” J. Alloys Compd., 336, 88-113 (2002)
连结：
4. Y. Kojima, “Project of plat form science and technology for advanced magnesium alloys,” Mater. Trans., 42, 1154-1159 (2001)
连结：
8. A. J. Bard and L. R. Faulkner, Electrochemical Methods, Fundamentals and Applications, 2nd ed, John Wiley & Sons, Inc. press, University of Texas at Austin, (2001)
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引用含有DOI的文献

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。 如想对DOI的使用与概念有进一步了解，请参考 （ ） 。

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。如想对DOI的使用与概念有进一步了解，请参考（）。