Studbolts - Hot-Dip Galvanized - hex bolt

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Electroless Nickel Plated

Electroless nickel plating is an autocatalytic process whereby a hard and corrosion resistant alloy of nickel and phosphorous is deposited onto a metallic surface by a chemical reaction. Nickel is a yellowish coloured metal applied for a cosmetic finish and corrosion protection. To provide a good corrosion resistance, the nickel layer of the raw material has to be sealed off from the environment, and, therefore, be porous free. This means that the layer should be at least 20 µm (up to 40-50 µm) to guarantee a good corrosion resistance. If the material is peroxidised, this may result in a thinner nickel layer. The nickel layer can be applied in a matt, semi-bright or bright finish. After the product has undergone this process, it can then be chrome plated again, if necessary.

Mechanical Zinc Plated

Mechanical zinc plating is a tumbling barrel process whereby a 3 – 80 µm thick zinc coating is applied  to the pre-treated steel surface (degreasing/descaling) by tumbling the parts with a mixture of zinc dust and ballotini (tiny glass beads). After the tumbling process, the zinc surface will be passivated or lubricated. Unlike electrolytic plating, the mechanical plating process avoids hydrogen embrittlement and therefore no weakening of the material occurs.

Chromium Plating

Chromium is a bluish-white coloured metal and is applied for decorative finishes and corrosion protection.  With decorative chromium plating, a nickel layer is always applied first. The chromium layer that is applied over this nickel layer is thin and gives the product a different colour. To provide a good corrosion resistance, the nickel layer of the raw material has to be sealed off from the environment, and, therefore, be porous free. This means that the layer should be at least 20 µm (up to 40-50 µm) to guarantee a good corrosion resistance. If the material is peroxidised, this may result in a thinner nickel layer. With chromium plating, the nickel layer determines the shine.