| WU Feng-jing,LIU Xiao-juan,XIAO Xin.Process of Silane-Zirconium Pretreatment for Carbon Steel[J],47(2):243-248 |
| Process of Silane-Zirconium Pretreatment for Carbon Steel |
| Received:July 27, 2017 Revised:February 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.02.038 |
| KeyWord:carbon steel silanization zirconium treatment composite conversion films environmental-friendly pretreatment corrosion resistance |
| Author | Institution |
| WU Feng-jing |
School of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan , China |
| LIU Xiao-juan |
School of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan , China |
| XIAO Xin |
School of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan , China |
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| Abstract: |
| The work aims to solve problems of high energy consumption and serious environmental pollution caused by conventional pretreatment process, develop a silane-zirconium metallic pretreatment process combining silanization and zirconium treatment and exhibiting excellent performing by further adjusting technological parameters based upon the silanized and zirconium-treated formula developed in early stage. Corrosion resistance of conversion films was tested by performing copper sulfate dropping experiment, saline immersion experiment and electrochemical polarization curve. Coating adhesion to metallic surface was tested by performing pull-off test, and microstructure of the conversion films was characterized with scanning electron microscope (SEM). The optimal process parameters were: pH=3.5, treatment temperature as 20 ℃ and treatment time as 10 min. Polarization curves results showed that corrosion current density of carbon steel treated with silane-zirconium was about 1/40 of that of untreated carbon steel. The films exhibited excellent corrosion resistance, coating adhesion to the substrate was approximately 11.48 MPa in the pull-off test, which completely met general requirement of pretreatment process. Microstructure analysis showed that the silane-zirconium films were nano-sized homogeneous, uniform and compact conversion ones which could provide effective protection for metallic surface. Silane-zirconium composite films exhibiting good properties can be prepared by adjusting pretreament technological parameters and combining silanization and zirconium treatment. The conversion films exhibit good corrosion resistance and adhesion to coatings, and meet requirement of pretreatment process. |
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