Best blackening chemicals
1. Black Oxide for Steel and Iron:
-Sodium Hydroxide (Caustic Soda): Often used in hot black oxide processes for steel and iron. It reacts with the metal surface to form a black iron oxide layer.
-Sodium Nitrite: Used as an oxidizing agent in conjunction with sodium hydroxide to accelerate the blackening process and enhance corrosion resistance.
2. Black Oxide for Stainless Steel:
-Selenious Acid: Commonly used in the blackening of stainless steel parts. It creates a durable black oxide layer on the surface.
-Sodium Polysulfide: Another chemical used in conjunction with selenious acid for blackening stainless steel.
