Construction machinery with high strength bolts for corrosion is generally plated surfaces of zinc or bluing treatment, disadvantage of this process is that the difference between the corrosion resistance of the bolt surface, rust, galvanized bolts and further care in hydrogen embrittlement.
For the above, we can use one of metal surface treatment of the latest technology in the world today - zinc chromate coating film.
Zinc-chromium film is also known as DACROMET, Darok, Dickon. The process is finished, skim - Shot - coating - curing - cooling the workpiece surface to form a sheet of zinc powder, silver coated aluminum corrosion gray powder and chromium metal salts thereof.
Compared with galvanized or blue-treated bolts, the bolts with zinc-chromium coating have the following advantages: corrosion resistance is improved by 7 to 10 times, anti-corrosion film can resist high temperature of about 300 degrees Celsius, no hydrogen embrittlement, permeability Extremely strong, it can also be recoated in a zinc-chromium film. In addition, the Dacromet-treated bolts are more economical than the electroplated or bluish-treated bolts.
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