Hexavalent passivation is a traditional chromium plating method that is classified as a special process due to its toxic nature. It is used to coat items with a thin layer that protects the material from abrasion and corrosion. It can be used to achieve a decorative finish and is also applied for functional purposes. As hexavalent passivation is regarded as a toxic process, many people choose trivalent passivation as a suitable alternative.
It offers an excellent degree of corrosion protection and provides either a clear film, yellow/red iridescent film or drab olive green film. Corrosion protection is approximately 72 hours to 5% white corrosion. It also has self-healing properties that enhance its corrosion protection.
The hexavalent chromium-based passivation process is used to protect metal sub-surfaces from corrosion. It also adds a flawless decorative finish. It can be applied to a range of metals including stainless steel, zinc, aluminium and copper.
It is a popular choice for all types of components such as fasteners and electrical components and has traditionally been used in automotive restoration. However due to the ELV, WEEE and RoHS Directives, hexavalent passivates can no longer be applied to parts used in electronic devices and the automotive industries. We offer alternative electroplating methods such as trivalent passivation and a range of topcoats that provide a similar level of corrosion protection and aesthetic, so speak to us to find out more.