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Standards Development
This international standard specifies requirments relating to chromate conversion coatings on zinc and cadmium intended to give protection against corrosion and to provide alkaline-resistant,dark stainresistant, heat-resistant, etc.
It also includes test methods for measuring the trivalent or hexavalent chromium coating weight and the total Cromium coating weight.
Finishes for giving particular colours only or specifically to improve paint adhesion are not covered by this international standard.
Coatings of zinc and cadmium are chromate treated in order to retard the formation of corrosion products on the surfaces of coatings exposed in corrosive atmospheres.
Cromate conversion coatings are widely applied to enhance the surface properties of building materials and home appliances.
Chromate conversion coatings, with trivalent or hexavalent chromium ions, are particularly effective in retarding the formation of white corrosion products which form on zinc and cadmium coatings under certain conditions.
Thicknesses of electroplated coatings suitable for chromate treatment are covered by the relevant International Standards,i.e. IS0 2081 and IS0 2082.
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