The Enplate Onyx mid-phosphorus electroless nickel process from Enthone is designed to provide an optimum black appearance on complex part geometries, including electrical connector components used in the commercial and military aerospace industries. The cadmium-free and lead-free process can be used on a range of substrates, including steel, stainless steel, titanium alloys, aluminum alloys, powdered metal products and copper alloys. It is RoHS, WEEE and ELV compliant.
The process includes a mid-phosphorus EN followed by a single immersion blackening step. The need for a post-dip sealant/topcoat is eliminated. Corrosion performance may be further optimized by using a duplex EN coating, the company says. Enplate is said to offer excellent solution stability and contaminant tolerance for an enhanced and consistent surface appearance.