The present invention provides a black, chrome-free, multilayer corrosion
protection finish designed to meet extended corrosion properties. This
corrosion-resistant finish is engineered to meet a minimum of 500 salt
spray testing hours to white corrosion, and 1500 salt spray testing hours
to red corrosion when tested to ASTM B117 standards. It is also designed
to comply with the European Union Directive on End of Life Vehicles. This
multilayer system is designed for use on automotive body sheet steel,
automotive underbody parts, automotive under-hood parts, and some
automotive interior parts specifying a gloss requirement greater than 4.
This chrome-free, multilayer finish is a combination of a zinc-iron
electroplated substrate, a non-electrolytic phosphate crystal conversion
layer using orthophosphoric acid, and a Xylan/Teflon fluorocarbon sealer
coating to form a three layer total corrosion protection system.