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By: Cameron Melvin
The biggest plus point of type III anodizing is the toughness of hard-coat anodizing procedure, which is designed to form an extremely rigid, scratch resistant, non-porous coating on different aluminum substances and produces. It is very much suitable and recommended for applications whereas one needs real hardness, oxide thickness and non-abrasive finish of aluminum goods including industries like aluminum cookware, fire products, military supplies and its equivalent.

Typical Setting of Type III Anodizing

Whereas, the overall treatment procedure is relatively matching to all categories of anodizing, the difference is found in solidify of the process. Type III anodizing is executed by submerging aluminum elements in sulfuric acid containing 180-210 grams acid a liter. The bath container is especially designed which can operate temperature at the level of 28 to 32 degree or slightly higher than that. Current density can range between 24 to 40 amps ASF as per necessity.

Hard-coat or type III anodizing uses highly advanced class of electrolytic process designed to produce harder and thicker coat of aluminum oxide both on the exterior and interior part of aluminum surface. Opposed to normal anodizing standards, type III anodizing typically produce 1 - 3 mils (0.001 - 0.003) thickness to get the desired wear resistance capacity, long functionality, and high corrosion resistance in materials produced from them.

Key Properties of Type III Anodizing

 Color dying is a unique property, which can be offered from brown to black tint apart from pure aluminum coating. Apart from endurance, color coating makes aluminum parts extremely non-porous, thicker even up to 0.005 and enhances product look.

 Type III anodizing increases exterior surface roughness equally with enhancement of coating thickness typically ranging between 10 - 20 micro-inches and 50-100 micro-inches for wrought alloys and aluminum casting respectively.

 When it comes to electrical properties, hard-coat anodized coating works as a super-class electrical insulators and exhibits very strong electrical resistance on varied materials. Type III anodized aluminum coating makes produces 10 times more wear-resistance to general category anodizing.

 Heat resistance capacity of anodized coated aluminum parts is likely to withstand exposure to high temperature, which makes them ideal for producing cookware items. With minimal exposure, they can even work with temperatures up to the level of 2000 degree C.

The Great Benefits of Type III Anodizing

Coatings are even harder than tool steels;

Thicker surfaces make anodized products repairable;

Color dying is an excellent potential of hard coat anodizing;

Extremely resistant to electricity conductivity;

Highly improved product surface with super finishing;

Wear resistance capacity is considerably high to general procedures;

Optimize corrosion resistance;

Superior in the midst of all its counterparts:

Environmentally friendly procedure;

Global standard solution; is one of the leading metal finishing companies offering a wide range of services such as metal polishing, aluminum anodizing, chromate conversion coating, electroless nickel plating, citric acid passivation, CNC machining, vapor degreasing, powder coating, type iii anodizing ( ), hardcoat anodizing, tumble polishing, black nickel plating, silver plating, gold plating etc. To know more, visit
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