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Effect of Sodium Silicate Sealing on Corrosion Resistance of TiO2Conversion Film on Hot-dip Galvanized |
Delin LAI,Gang KONG(),Chunshan CHE |
1. Material Science and Engineering, South China University of Technology, Guangzhou 510640, China |
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Abstract TiO2conversion film was prepared on the surface of hot-dip galvanized (HDG) carbon steel Q235 in Ti(SO4)2solution with hydrogen peroxide H2O2as chelating agent. Then the prepared TiO2conversion film was further sealed via immersion in sodium silicate solution. The effect of conversion treatment time on the morphology and corrosion resistance of the TiO2conversion film was studied. While the morphology, composition and corrosion resistance of the sodium silicate sealed TiO2conversion film were characterized by means of SEM with EDS, XRD, XPS and electrochemical measurements. The results show that the conversion film consists of a large amount of TiO2nanospheres, which formed on surface of the HDG steel after a short-time immersion, and then with the increasing immersion time, the nanospheres are gradually covered by reaction product ZnO/Zn(OH)2and crack appears on the conversion film, correspondingly the corrosion resistance of the HDG steel first increases and then decreases. A complete and dense TiO2conversion film shows better corrosion resistance, but cracks on the film can cause pitting corrosion. After sealing treatment, a sodium silicate film may further cover the pre-formed TiO2conversion film, however, there are a large number of cracks in micron scale on the surface of such complex film. In general, after sodium silicate sealing treatment, the corrosion resistance of the short-time formed conversion film decreases, in the contrary, the corrosion resistance of long-time formed conversion film increases.
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Received: 22 November 2017
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Fund: Supported by National Natural Science Foundation of China(21103053);Supported by National Natural Science Foundation of China(91023002) |
Corresponding Authors:
Gang KONG
E-mail: konggang@scut.edu.con.
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