Zinc electroplating is one of the most cost effective methods of corrosion resistance for iron or steel. Zinc coating lays a thin film of zinc over the surface to provide sacrificial protection to the underlying substrate. The term sacrificial refers to the way the zinc corrodes in preference to the substrate. A layer of zinc coating provides the added benefit that when steel is exposed at cut or abraded areas it will not easily rust.
Zinc coating finishes are normally enhanced by a post-plating conversion coating. This is more commonly known as a passivate, and applies a thin coating onto the surface of the zinc.
Traditionally, passivate coatings contain hexavalent chrome. However, due to the End of Life of Vehicles (ELV) Directives and Legislation such as Registration, Evaluation and Authorisation of Chemicals (REACH), Anochrome Group has now replaced all passivates with hexavalent chromium-free coatings. Generally these fall into two categories of trivalent passivate – lightweight or heavyweight. This is dependent on the finish performance or specification required.
Extra coatings can be added to further improve various performance, such as salt spray resistance. We can also work to modify the lubricity of the component or fastener by the addition of top coat torque modifiers. These are available in a range of values to suit the majority of automotive specifications.
Anochrome offers an extensive range of passivates, tops coats and torque modifiers. This includes the following: Lanthane Passivate, Finigard 105, Magni B18, JS500, ELV1500 LT, ELV3000, ELV 5105, ELV Blue, Deltacol GZ, TnT 08, TnT 11, TnT, 12, TnT 15, Gleitmo, A3 Wax.
BARREL
The barrel process involves placing the items for zinc coating in a perforated barrel-shaped cage made from nonconductive material. The barrel is then submerged into a series of tanks containing the appropriate chemical solutions, while a slow tumbling action is used to begin the zinc plating action. This is a very cost effective method but is more suited to small parts rather than large or complex parts.
RACK
The rack plating process involves locating the items for zinc coating on an electrically conductive jig / rack. The rack is then submerged into a series of tanks containing the appropriate chemical solutions, to begin the plating process. This is a more costly option than barrel platings but may be more suitable for large or complex parts.
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