Epoxy zinc-rich coating is a heavy-duty anti-corrosion coating with excellent corrosion resistance, which has been widely used in various fields of industrial anti-corrosion. The article "Research on Anticorrosion Performance of Epoxy Zinc-rich Coatings for Containers" introduces that the author screened out the basic formula of zinc powder coatings through the salt spray corrosion resistance test of epoxy zinc-rich coatings, and then according to the supporting outdoor anti-corrosion tracking and IICL certification tests The optimized formula was studied, and the epoxy zinc-rich heavy-duty anti-corrosion coating with excellent anti-corrosion function suitable for container matching requirements was prepared. Among them, the effects of zinc powder content, epoxy-modified polyamide curing agent on the salt spray resistance of the coating film, and the effect of the equivalent ratio on the IICL test results were analyzed for the anticorrosion test results.
The manufacturing process of epoxy zinc-rich coatings: Weigh epoxy resin, additives and mixed solvent according to the formula, disperse evenly, add zinc powder, disperse at high speed for 30 minutes, adjust the viscosity to 120KU (Stormer viscosity), filter and discharge. The prepared coating component and curing agent component are formulated into an epoxy zinc-rich anticorrosion primer in a ratio (mass ratio) of 12:1.
Conclusion: When an epoxy-modified polyamide is selected as the curing agent in the epoxy zinc-rich coating formula and the equivalent ratio is set to 0.8, the cohesion of the coating film is improved, and the crosslinking density and glass transition temperature of the coating film are increased. Thereby greatly improving the salt spray corrosion resistance of the coating. When the PVC value of the epoxy zinc-rich coating film is 42% and the zinc powder content in the dry coating film is 82%, the epoxy zinc-rich coating has good mechanical properties and salt spray corrosion resistance. The corrosion test time can reach 1 000 h, and the supporting outdoor anti-corrosion can guarantee the box paint warranty period of more than 5 years, and meet the requirements of IICL certification indicators, successfully passed the IICL certification, and exhibit excellent comprehensive performance.
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