Dacromet" is a new type of structural and performance protective layer, which is formed by coating the surface of the part with a coating solution composed of flaky zinc powder, aluminum powder, chromium-containing metal salt and binder. English is called It is "Dacromet". The relevant standard in China is called "Zinc-Chromium Coating".
1, Good corrosion resistance. Dacromet film thickness is only 4~8μm, but its antirust effect is 7~10 times higher than traditional electro-galvanized, hot-dip galvanized or coating. Dacromet coating ratio is the same Other coatings (plating) layers with a higher thickness have better corrosion resistance. The Dacromet film only corrodes 1 μm after the salt spray test for 100 hours. After the salt spray test for more than 1200 hours, the standard parts and pipe joint parts treated by Dacromet No red rust appeared.
2. The thickness of the coating is under 8.6μm, and there is no red rust after 1000h. Dacromet coating is mainly used to treat steel parts to improve the corrosion resistance and lubricity of the parts. The main component is zinc chromium. Improved Zn- Al dacromet coating has better corrosion resistance than conventional dacromet coating, and it remains intact after 2100 hours of salt spray corrosion.
3, High heat resistance. The Dacromet coating is formed by sintering at 300 degrees Celsius, which can meet the long-term use in high temperature environments and maintain good appearance and corrosion resistance. Even at 500 degrees Celsius, up to The Crow film still maintains its good stability and thermal corrosion resistance.
3. No hydrogen embrittlement. Hydrogen embrittlement is a problem in traditional electroplating anticorrosion technology. In Dacromet process, there is no need for pickling, and there is no electrolytic process. It should be cured at a high temperature of 300 degrees Celsius to reduce all possible corrosion of the steel matrix. H plus corrosion. path, so there is no hydrogen embrittlement in the dacromet coating. Therefore, it is especially suitable for high-strength parts sensitive to hydrogen, such as bolts and springs.