| LU Ji,SHI Yan.Microcosmic Appearance of Mechanical Zinc Coatings and Superficial Organic Silicon Pore Sealing and Anticorrosion Treatment[J],36(6):36-38 |
| Microcosmic Appearance of Mechanical Zinc Coatings and Superficial Organic Silicon Pore Sealing and Anticorrosion Treatment |
| Received:August 16, 2007 Revised:December 10, 2007 |
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| DOI： |
| KeyWord:Mechanical plating zinc coating Methyl hydrogen silicone fluid Titanium isopropoxide Benzinum Solidifying reaction |
| Author | Institution |
| LU Ji |
School of Resources and Environmental Engineering, Shandong University of Science and Technology,Zib0 55049, China |
| SHI Yan |
Zibo Boiler & Pressure Vessel Inspection Institute, Zib0 , China |
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| Abstract: |
| By using SnS04 water solution to activate global granular Zn powders of 325 screen mesh, Zn-Sn composite coverage is formed under the action of mechanical impact of the tiny glass beads and work pieces for protecting parent metal. On account of the increasingly thick plating coat processed in acid environment, acid liquor is unavoidably occluded under the plating coat. Acid liquor will react with metal basal body and coats, and hydrogen gas is bound to emit from the pathway and form micro pores. In addition, there are bond areas between the new and the primary coverage because of the growing up of the plating coat, which may lead to the emergence of micro crack on the coating owing to such causes as too big or uneven impact during plating process, little distortion of global granular zinc dust inside the plating coat, less tight coalescence of the zinc dust flecks. These problems can be confirmed by SEM scanning coating surface and cross section pictures of plating coat. In our study, methyl hydrogen silicone fluid, titanium isopropoxide and benzinum are used as the basal components. This compound has better osmosis for micro pores and cracks formed in the process of dual coverage. Through tests, the weight percentage of the methyl hydrogen silicone fluid to the compound is determined separately as 11 percents, the titanium isopropoxide as 10 percents, and the benzinum( 90 ~ 120 centigrade degree) as 79 percents. Salt fog test indicates that when the coating thickness is 0. 2 micron, the emergence time of white corrosion on the plating coat doubles, accordingly, that of red rust prolongs, which shows that the anticorrosion of the coverage can be significantly improved through superficial pore sealing in zinc plating coat. |
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