Who knows the formula of metallic iron room temperature blackening agent?

Formulation of environmental protection blackening liquid at room temperature;

Copper sulfate pentahydrate (reagent) 3.0-5.0g/L.

Potassium pyrophosphate (reagent) 0.8- 1.2g/L

Nickel sulfate tetrahydrate (reagent) 0.2g/L.

Ammonium molybdate (reagent) 0.2g/L.

Alkylphenol polyoxyethylene ether (OP- 10, reagent) 0.2g/L.

Composite additive ((CH20 1 1), various metal salts) 0.2g/L.

Add water to1.0l.

The PH value of the solution is 2.5-3.0, the blackening time is 5-7 minutes, and the use temperature is normal temperature.

The agent has the characteristics of strong adhesion to the substrate, corrosion resistance, simple production, normal temperature use and no environmental pollution, and is suitable for steel surface protection.