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| EFFECTS OF THE REDUCTANT ON THE ZINC-BASED WATERBORNE ANTICORROSIVE COATING |
| LI Tao; ZHAO Maiqun; ZHAO Yang; GUO Jia |
| College of Materials Science and Engineering; Xi’an University of Technology; Xi’an 710048 |
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Abstract The effects of four kinds of reductants, acrylic acid, succinic acid, glycerol, glucose, and their contents on the bonding strength and anticorrosion of zinc-based waterborne anticorrosive coatings were studied through adhesive tape test, ammonium nitrate solution accelerated corrosion method, electrochemical measurement, thermogravimetric and comparison with zinc plating. The experimental results indicate that variety and content of the reductants had markedly influenced on the bonding strength and corrosion resistance of coatings. Using acrylic acid as the reductant the coatings had high bonding strength in a large adding range, and it can hold high bonding strength when the other reductants had low content. The corrosion resistance time increases firstly, and then decreases with the increment of reductant content. The coatings with acrylic acid or glycerol as reductant had good comprehensive properties, optimal dosage were 60 g/L and 20 g/L respectively. The coatings are composed of multilayer flake zinc powder and cement substance, and the corrosion resistance performances are obviously superior to zinc plating under different environmental conditions. Moreover, the formation mechanism of coatings is analyzed, thermodynamical calculation shows that all the cure reactions using these reductants can proceed automatically at solidifying temperature.
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Received: 19 November 2007
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