What Is Anodized Process B

What Is Anodized Process B

What Is Anodized Process

1

Anodizing is an electrolytic passivation process used to thicken the natural oxide layer on the surface of metal parts.

Type III anodizing, also known as hard anodizing,

is used where higher wear and corrosion resistance is required and consists of a 25-nanometer thick oxide layer.

Anodizing involves an electrochemical process that turns the outer surface of a metal part into a durable,

corrosion- and scratch-resistant layer. Anodizing uses a base metal (an aluminum alloy) to form a thin,

extremely durable, and corrosion-resistant coating.

The anode coating is formed from the base metal and therefore consists of the same composition as aluminum.

The anodized surface is very hard, so it protects and prolongs the life of aluminum products.

Unlike other finishes, anodizing allows aluminum to retain its metallic appearance.

Anodizing gives aluminum a deeper, richer metallic appearance than organic coatings.

Type II anodizing uses sulfuric acid to create a thicker surface layer on aluminum parts.

Cleaning aluminum parts is important to remove impurities that may interfere with anodizing.

The aluminum is anodized along with the product, so it must be cleaned after every use.

2

To prepare aluminum for anodizing, first thoroughly clean and wash the surface, then place it in a bath of electrolytes such as sulfuric acid.

Oxygen ions are released from the electrolyte and bind to the aluminum atoms on the surface of the anodized part.

The aluminum parts are anodes (hence the name “anodizing”),

and an electric current passes between them and the cathode (usually a flat aluminum rod)

through the aforementioned electrolyte (most commonly sulfuric acid).

Electricity is passed through the electrolyte, and the aluminum becomes the anode in this cell; the water reservoir is the cathode.

In the electrolytic process, the components to be treated are converted into an anode in a dilute acid solution.

The anodizing process takes place in an electrochemical cell, in which the anodized part is the anode,

and the cathode is a plate/rod made of chemically inert material in an acidic electrolyte (carbon, stainless steel, nickel).

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