Chengdu Brake Drum Painting Quote

For corrosion-resistant coatings on fastening bolts used outdoors over extended periods, hot-dip galvanizing or mechanical galvanizing is selected, with zinc content standardized for heavy-duty zinc coatings. Therefore, for long-term atmospheric corrosion protection in outdoor environments, the use of thick mechanically zinc-plated coatings on fasteners is more suitable than the application of Dacromet coatings. The process flow is: degreasing with neutral detergent → surface oxide layer treatment via shot blasting → multi-element alloy co-diffusion in a co-diffusion furnace → cooling → shot blasting → passivation → finished product. ● Dacromet is an abbreviation and transliteration of DACROMET. Specifically, it refers to a flake-like zinc-based chromate protective coating, representing a cutting-edge surface treatment technology worldwide. The DACROMET coating process involves mixing zinc flakes, chromic acid, and water-based additives into a solution. This solution is applied to the metal surface and sintered at 300°C to form a protective layer. Its key feature is resistance to saltwater corrosion, though its adhesion, mechanical strength, shear resistance, wear resistance, and hardness properties are generally average. The Dacromet process flow is: Degreasing with neutral detergent → Surface oxide layer removal via shot blasting → Immersion or spraying with Dacromet solution → Sintering and oxidation-reduction curing at approximately 300°C → Cooling → Finished product.