The main ingredient of the black chrome plating additive analysis

Black chrome plating management simple, direct plating over nickel, bronze, copper, iron, stainless steel, chrome base, coating is shiny black, uniform color, and good adhesion substrate, corrosion resistance and discoloration resistance pole good, especially for the automotive, appliance parts plating and solar panels. First, the main ingredient of the black chromium plating bath additive composition analysis of the bath composition and process conditions the scope of the standard content of chromic acid 350 ~ 450g / L 400g / L of trivalent chromium 4 ~ 10g / L 6g / L black chrome additive 8 ~ 15g / L 13g / L cathode current density 10 ~ 70A / dm2 30A / dm2 Temperature 15 ~ 25 ℃ 20 ℃ plating time 1 ~ 10min 3min special chromium plating anodes Anode Anode: Cathode 1.2 to 2: 1