Anodized color

The electrode is anodized metal or metal coated on the surface. The black oxide film or coating on the metal surface is colored by the action of electric field during electrolysis.

Anodic oxide film has a porosity of 20-30% (sulfuric acid film), so there is a huge surface area and chemical activity, dye molecules through the physical and chemical adsorption of oxide film deposited in the surface layer and color.

Chemical adsorption refers to the oxidation film and pigment through ionic bond, covalent bond or form a complex form of combination, adsorption is relatively strong. Compared with chemical adsorption, physical adsorption is weaker and more affected by temperature.

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