In this galvanic process, a zinc coating is deposited onto the product surface by means of electrolysis. The electrolytic process uses an aqueous solution in combination with electrolysis to produce a solid zinc deposit. The result is a smooth and bright layer. The layer thickness varies from 5 – 40 µm and this is determined by the current density and the immersion time in the zinc bath. The galvanised layer is then treated with passivation solutions such as chromate or dichromate, which increase the corrosion resistance and gives a decorative appearance. The passivation layer is a thin zinc-chromium/zinc-oxide layer on top of the zinc coating. The zinc layer has a light blue translucent hue. This process comprises oxy-hydrogen gas, which, in the case of forged steel types, can be absorbed into the material structure. There is no risk of material deformation.
The presence of oxy-hydrogen gas may have adverse effects such as hydrogen embrittlement. Consequently, fractures or tears may occur. The higher the tensile strength class, the greater the risk is of this occurring. Certainly, with steel grades higher than 8.8, the hydrogen absorbed into the steel can result in significant loss in ductility, the so-called hydrogen embrittlement. The likelihood of hydrogen embrittlement cannot be ruled out. Stokvis Trading BV does not accept any liability whatsoever in this respect.
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