電鍍鋅鋼板的複合型三價鉻鈍化處理

楊育銓

doi:10.6342/NTU.2012.01573

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電鍍鋅鋼板的複合型三價鉻鈍化處理

Composite Trivalent Chromium Conversion Coating on Electrogalvanized Sheet Steel

楊育銓 , Masters　　Advisor：林招松　　

繁體中文 DOI： 10.6342/NTU.2012.01573

電鍍鋅鋼件；六價鉻鈍化；複合型三價鉻鈍化；鹽霧試驗；交流阻抗；極化曲線； electrogalvanized steel ； hexavalent chromium passivation ； composite trivalent chromium passivation ； salt spray test ； EIS ； potentiodynamic polarization curves

Abstract │ Reference (111) │ Altmetrics

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Electrogalvanized zinc has been widely used to improve the corrosion resistance of steel, but its active chemical property may cause other corrosion problems although the steel beneath is protected. Hexavalent chromium passivation treatment has generally been used to further improve the corrosion resistance of the electrogalvanized steel and the adhesion between the substrate and painting layer. However, hexavalent chromium is highly toxic and severely endangers ecological environment and operators’ health. Since several international regulations have limited the use of hexavalent chromium, the development of alternatives to the hexavalent chromium passivation treatment is now an urgent necessity. Trivalent chromium compounds possess chemical properties similar to hexavalent chromium ones and are not toxic, so recently they have been used as one of the alternatives for the passivation treatment on electrogalvanized steel. In this study, hexafluorosilicic acid, which can dissociate into silicon dioxide nanoparticles in the solution, is added in a trivalent chromium conversion bath to form the composite trivalent chromium conversion coating. Chemical compositions, microstructure characterization, and corrosion resistance of the composite trivalent chromium conversion coating are discussed firstly. Experimental results showed that the composite trivalent chromium coating consisted of trivalent chromium and zinc oxide/hydroxides, silicon dioxide, trivalent chromium fluoride, and zinc fluoride. From the cross-sectional TEM observation, the composite trivalent chromium conversion coating was denser than the traditional trivalent chromium conversion coating. Especially, the coating fabricated by adding 2.5×10-2 M hexafluorosilicic acid in the conversion bath presented a double-layer structure with enhanced compactness. After 168 h of the salt spray test, the conversion coating formed in the bath with the addition of 2.5×10-2 M hexafluorosilicic acid showed the best corrosion resistance. Moreover, the electrochemical analyses, including EIS and potentiodynamic polarization curves, also indicated that the presence of hexafluorosilicic acid in the trivalent chromium bath indeed improved the corrosion resistance of the composite trivalent chromium conversion coating.

Reference ( 111 ) 〈TOP〉

[2] G. D. Wilcox, “Replacing Chromates for the Passivation of Zinc Surfaces,” Transactions of the Institute of Metal Finishing 81, (2003) B13.
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[3] W. F. Finney, E. Wilson, A. Callender, M. D. Morris, L. W. Beck, “Reexamination of Hexafluorosilicate Hydrolysis by 19F NMR and pH Measurement,” Environ. Sci. Technol., 40, (2006) 2572.
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[4] E. T. Urbansky, “Fate of Fluorosilicate Drinking Water Additives,” Chem. Rev. 102, (2002) 2837.
連結：
[5] A. Hensge, J. Acker, “Chemical Analysis of Acidic Silicon Etch Solutions I. Titrimetric Determination of HNO3, HF, and H2SiF6,” Talanta 73, (2007) 220.
連結：
[6] J. Acker, A. Hensge, “Chemical Analysis of Acidic Silicon Etch Solutions II. Determination of HNO3, HF, and H2DiF6 by Ion Chromatography,” Talanta 72, (2007) 1540.
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