| Condition: | New |
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| Certification: | RoHS, ISO9001 |
| Standard: | ASTM, GB |
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What is DACROMET
DACROMET® is an aqueous solution comprising zinc in flake phase, aluminium metal powder and inorganic compound. It is normally treated by dip and spin coating of this aqueous solution followed by heat-treatment at a relatively high, that is, about 300°C temperature. As a result, 7-8 μm thick coating is formed by drying and curing during the hot air drying process. Metal zinc and aluminium, which constitute the coated film, can protect steel via self-sacrificing, namely, by inhibiting the corrosion of a given steel due to the electric activity of highly ionisable metal zinc. Here, the chromic acid in a polymerized state can control and inhibit the self-sacrificing of metal zinc thus serving the role of a binder while also establishing the passivation of coating, which then leads to inhibition of chemical reaction between zinc and iron and accordingly reduces the speed of corrosive progress, thus exhibiting high corrosion resistance. In addition, the zinc, aluminium flake and metal oxide, which are of multi-layered structures, can protect the surface of iron alternatively thus functioning as a barrier against external corrosive factors thereby exhibiting superiority in corrosion resistance.
1. Superior corrosion resistance: The thickness of the Dacromet film is only 4-8μm, but its rust-preventing effect is 7-10 times higher than that of traditional electro-galvanizing, hot-dip galvanizing or coating. The standard parts and pipe fittings treated by the Dacromet coating process have not experienced red rust after more than 1200 hours of smoke resistance test;
2. High heat resistance: Dacromet's heat-resistant temperature can reach above 300 °C, but the traditional galvanizing process, when the temperature reaches 100 °C, has been scrapped;3. Good permeability: Due to the electrostatic shielding effect, it is difficult to plate zinc on the deep holes, slits, and inner walls of the pipe, so that the above parts of the workpiece cannot be protected by electroplating. And Dacromet can enter these parts of the workpiece to form a Dacromet coating
4. No pollution: During the whole process of production and processing and workpiece coating, Dacromet will not produce environmentally polluted wastewater and waste gas, and it will not require three wastes to be treated, which will reduce the treatment cost.
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