DIN EN ISO 6158:2011

Metallic and other inorganic coatings - Electrodeposited coatings of chromium for engineering purposes (ISO 6158:2011); German version EN ISO 6158:2011

This International Standard specifies requirements for electroplated coatings of hexavalent chromium, with or without undercoats, on ferrous and non-ferrous metals for engineering purposes. The coating designation provides a means of specifying the thickness of chromium appropriate for typical engineering applications.*Electrodeposited chromium coatings are frequently deposited from hexavalent chromium solutions similar to those used for decorative electroplating. Engineering chromium coatings, however, are generally thicker than decorative ones. Regular or conventional chromium is the type most frequently specified, but porous, cracked or specially profiled surfaces and duplex chromium are also applied to achieve oil-retaining or non-sticking surfaces, or to improve corrosion resistance. Electrodeposited chromium coatings for engineering applications are most often applied directly to the basis metal to increase wear and abrasion resistance and to increase fretting resistance. They are also used, however, to reduce static and kinetic friction, to reduce galling and seizing, to increase corrosion resistance, and to build up undersize or worn parts. For protection against severe corrosion, nickel or other metallic undercoats are applied prior to the electrodeposition of chromium, or the corrosion resistance of the chromium coating may be increased by alloying, for example, with molybdenum. This International Standard specifies requirements for electroplated coatings of hexavalent chromium, with or without undercoat(s), on ferrous and non-ferrous metals for engineering purposes. The coating designation provides a means of specifying the thickness of chromium appropriate for typical engineering applications. This document (EN ISO 6158:2011) has been prepared by Committee ISO/TC 107/SC 3 "Electrodeposited coatings and related finishes", the secretariat of which is held by KATS (South Korea), and has been adopted within the framework of the Vienna Agreement by CEN/TC 262 "Metallic and other inorganic coatings", the secretariat of which is held by BSI (United Kingdom). The responsible German standardization committee is NA 062-01-76 AA "Galvanische Überzüge" ("Electrodeposited coatings") at the Materials Testing Standards Committee (NMP).