Study on the Performance of Anti - Corrosive Coating Containing Flaky Zn - Al - Mg - Ce Alloy Based on Water - Borne Epoxy Resin Latex
In order to obtain environmentally - friendly water - borne epoxy anti - corrosive coatings with high corrosion resistance at lower volume of alloy powder, water - borne epoxy resin emulsion was used as the main film - forming material, and 3 spherical or scale like Zn - Al based alloy powders were...
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| Format: | Article |
| Language: | zho |
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Editorial Department of Materials Protection
2021-03-01
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| Series: | Cailiao Baohu |
| Subjects: | |
| Online Access: | http://www.mat-pro.com/fileup/1001-1560/PDF/20210319.pdf |
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| Summary: | In order to obtain environmentally - friendly water - borne epoxy anti - corrosive coatings with high corrosion resistance at lower volume of alloy powder, water - borne epoxy resin emulsion was used as the main film - forming material, and 3 spherical or scale like Zn - Al based alloy powders were used as anti - corrosive pigments to prepare water - borne epoxy anti - corrosive coatings. The effects of the type of anti - corrosive pigments, pigment volume concentration (PVC), silane coupling agent and dispersant on corrosion resistant, hardness and adhesion of coating were investigated. Furthermore, optimal coating ingredients were formulated after comparing their overall performances. Results showed that the coating with flaky Zn - Al - Mg - Ce alloy powder as corrosion inhibitor exhibited better corrosive resistance than that with spherical and lamellar Zn - Al alloy, and at PVC of 28% the coating had the better overall performances. Besides, the usage of silane coupling agent (KH - 560) could improve the corrosive resistance of the coating, the proper amount of wetting dispersant could ensure satisfactory disperse of pigment and filler. The coating containing 12.0% flaky Zn - Al - Mg - Ce alloy, 28%PVC, 3.2% silane coupling agent and 1.5% wetting dispersant, showed adhesion grade 1, hardness 4H, neutral salt spray test lasted for 600 h, the corrosive current density of Tafel curve showed that the corrosion rate decreased to 0.064% of that of substrate. The water resistance test lasted for 780 h without foaming or falling off. |
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| ISSN: | 1001-1560 |