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Company News >> How Cosmetic Brush Manufacturers Methods of Aluminum Oxidation

Aluminum Oxidation by Cosmetic Brush Manufacturers

Methods of Aluminum oxidation consisit of natural oxidation, electrochemical oxidation, chemical oxidation, alkaline oxidation, acid oxidation, and anodization. 
Electrochemical oxidation
The thickness of the oxide film is about 5-20 microns (the thickness of the hard anodized film can reach 60-200 microns), the hardness is high, the heat resistance and insulation are good, the corrosion resistance is higher than that of the chemical oxide film, and it is porous. Good adsorption capacity.
Aluminum is a relatively active metal with a standard potential of -1.66v. It can naturally form an oxide film with a thickness of about 0.01-0.1 microns in air. This oxide film is amorphous, thin and porous, and has poor corrosion resistance. However, if aluminum and its alloys are placed in a suitable electrolyte, an aluminum product is used as an anode, and an oxide film is formed on the surface by an applied current. This method is called anodization.
Aluminum Oxidation by Cosmetic Brush Manufacturers
By selecting different types and concentrations of electrolytes and controlling the process conditions during oxidation, anodized films having different properties and thicknesses of about several tens to several hundreds of micrometers can be obtained, which have corrosion resistance, wear resistance and decorative properties. And so on, there are obvious improvements and improvements.

There are many methods for anodizing aluminum and its aluminum alloys. Commonly used by makeup brush manufacturers include sulfuric acid anodizing, chromic acid anodizing, oxalic acid anodizing, hard anodizing and porcelain anodizing.
aluminium anodizing process by makeup brush manufacturers
sulfuric acid
Aluminium and its alloys are anodized in a dilute sulfuric acid electrolyte by direct current and alternating current to obtain a colorless transparent oxide film having a thickness of 5 to 20 μm and good adsorptivity.
The sulfuric acid anodizing process is simple, the solution is stable, the operation is convenient, the impurity content range is wide, the electric energy consumption is small, the cost is low, and it can be applied to the processing of aluminum and various aluminum alloys, therefore it has been widely used in Chinese makeup brush manufacturers.

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