| Growth and corrosion resistance of molybdate modified zinc phosphate conversion coatings on hot-dip galvanized steel |
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| 作者姓名： | 林碧兰 卢锦堂 孔纲 刘军 |
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| 作者单位： | School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China |
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| 摘 要： | The modified zinc phosphate conversion coatings（ZPC） were formed on hot-dip galvanized（HDG） steel when 1.0 g/L sodium molybdate were added in a traditional zinc phosphate solution. The growth performance and corrosion resistance of the modified ZPC were investigated by SEM, open circuit potential（OCP）, mass gain, potentiodynamic polarization and electrochemical impedance spectroscopy（EIS） measurements and compared with those of the traditional ZPC. The results show that if sodium molybdate is added in a traditional zinc phosphate solution, the nucleation of zinc phosphate crystals is increased obviously; zinc phosphate crystals are changed from bulky acicular to fine flake and a more compact ZPC is obtained. Moreover, the mass gain and coverage of the modified ZPC are also boosted. The corrosion resistance of ZPC is increased with an increase in coverage, and thus the corrosion protection ability of the modified ZPC for HDG steel is more outstanding than that of the traditional ZPC.
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| 关 键 词： | 磷酸锌涂层 钼酸盐 生长性能 耐腐蚀性 热浸镀锌钢 |
| 收稿时间： | 17 October 2006 |
| 修稿时间： | 2006-10-172007-05-21 |
Growth and corrosion resistance of molybdate modified zinc phosphate conversion coatings on hot-dip galvanized steel |
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| LIN Bi-lan,LU Jin-tang,KONG Gang,LIU Jun.Growth and corrosion resistance of molybdate modified zinc phosphate conversion coatings on hot-dip galvanized steel[J].Transactions of Nonferrous Metals Society of China,2007,17(4):755-761. |
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| Authors: | LIN Bi-lan LU Jin-tang KONG Gang LIU Jun |
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| Affiliation: | School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | The modified zinc phosphate conversion coatings(ZPC) were formed on hot-dip galvanized(HDG) steel when 1.0 g/L sodium molybdate were added in a traditional zinc phosphate solution. The growth performance and corrosion resistance of the modified ZPC were investigated by SEM, open circuit potential(OCP), mass gain, potentiodynamic polarization and electrochemical impedance spectroscopy(EIS) measurements and compared with those of the traditional ZPC. The results show that if sodium molybdate is added in a traditional zinc phosphate solution, the nucleation of zinc phosphate crystals is increased obviously; zinc phosphate crystals are changed from bulky acicular to fine flake and a more compact ZPC is obtained. Moreover, the mass gain and coverage of the modified ZPC are also boosted. The corrosion resistance of ZPI is increased with an increase in coverage, and thus the corrosion protection ability of the modified ZPC for HDG steel is more outstanding than that of the traditional ZPC. |
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| Keywords: | zinc phosphate conversion coatings molybdate growth performance corrosion resistance |
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