BS EN ISO 2081:2018,Metallic and other inorganic coatings – Electroplated coatings of zinc with supplementary treatments on iron or steel.
BS EN ISO 2081:2018 specifies requirements for electroplated coatings of zinc with supplementary treatments on iron or steel. It includes information to be supplied by the purchaser to the electroplater, and the requirements for heat treatment before and after electroplating.
BS EN ISO 2081:2018 does not specify requirements for the surface condition of the basis metal prior to electroplating with zinc. However, defects in the surface of the basis metal can adversely affect the appearance and performance of the coating.
The coating thickness that can be applied to threaded components can be limited by dimensional requirements, including class or fit.
Zinc coatings are applied to iron or steel articles for protective and decorative purposes by Electroplated, bright zinc coatings are popular and the processes for preparing bright zinc coatings are widely used.
The ability of a zinc coating to prevent corrosion is a function of its thickness and the type of service conditions to which it is exposed. For example, the rate of corrosion of zinc will generally be greater in industrial exposures than in rural ones. The type of service condition should, therefore, be taken into consideration when specifying the minimum coating thickness. Trivalent chromate conversation coatings and other supplementary treatments enhance the corrosion resistance of electrodeposited zinc coatings and are commonly applied after electroplating.
Due to the REACH Regulations the use of hexavalent chromium compounds will be banned in Europe rom September 2017 except where specifically authorized. Alternative conversion coatings or substitutes, can be used and are required to satisfy the corrosion requirements given in this document.
Standard designations for metals and alloys can be found in References [12] to [16].

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