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Anodizing Type II, Class 1 (Un-Dyed) & Class 2 (Dyed)
Sulfuric acid anodizing
In general, anodizing refers to conversion coating of the surface of aluminium and its alloys to porous aluminium oxide. The process derives its name from the fact that the aluminium part to be coated becomes the anode in an electrolytic cell.
This differentiates it from electroplating, in which the part is made the cathode. Whereas anodizing is typically associated with aluminium, similar processes are used for other base metals, including magnesium, titanium and zinc.
On most aluminium alloys, the sulfuric acid anodic coating is colourless and transparent. Alloys containing high manganese and silicon levels tend to give greyish or brownish coloured coatings. The transparency of the coating decreases with increasing coating thickness.
(HARD COAT) Hard Anodizing Type III, Class 1 (Un-Dyed) & Class 2 (Dyed)
The primary differences between the sulfuric acid and hard anodizing processes are the operating temperature, the use of additional agents, and the voltage and current density at which anodizing is accomplished. Hard anodizing, also referred to as hard coat or type III anodizing, produces a considerably heavier coating then conventional sulfuric acid anodizing in a given length of time.
Typical operating temperatures of the bath range from 0°C to 10°C current density ranges between 2 and 3.6 a/dm². However, some hard anodizing processes operated at high temperature may result in the formation of soft and more porous outer layers of the anodic coating. This change in coating characteristics reduces wear resistance significantly and tends to limit coating thickness.
Chemical Conversion Coatings Type II
Also known as Chem Film, Irridite, Alodine, Chem Treat.
Chemical conversion coatings are intended to prevent corrosion, improve adhesion of paint finish or other coatings, and for improved electrical and electronic applications where low resistance contacts are required.