About

Mil-A-8625, Type II, Cl 1 and 2, AMS 2471, AMS 2472, SCGPS 06026 .

Anodizing is an electrolytic oxidation process. It is an artificial thickening of a thin native oxide film that is always present on aluminum exposed to the atmosphere. The principal functions of anodic coatings are to provide hard, wear and scratch-resistant surfaces on aluminum parts to protect the metal surface from corrosion and staining and to achieve and maintain specific decorative texture, color, and appearance effects. Additional functions include maintaining high reflectivity, controlling thermal properties, and providing electrical insulation. Anodic coatings also find use as a base for organic coatings, adhesives, and lubricants. This oxide coating can be dyed to a variety of colors such as black, green, red, violet, gold, brown, blue, and gray.

Key Benefits

Black, Blue, Brown, Clear, Dichromate, Gold, Gray, Green, Orange, Purple, Red.

Colors

Black, Blue, Brown, Clear, Dichromate, Gold, Gray, Green, Orange, Purple, Red .

Mil-C-5541, Mil-DTL-5541; Mil-DTL-81706; Cl 1A and 3, AMS 2473, AMS 2474; AMS 2477 .

Chemical Film, also known as chromate conversion coatings on aluminum, are used to retard and prevent corrosion, as a base for paint and as a protective surface having lower electrical contact resistance than anodized coatings. The coating generally provides protection in proportion to film thickness. It provides good protection against marine and humid environments. The hexavalent chromium compounds in chromate conversion films have self-healing characteristics on minor abraded or scratched surfaces. Corrosion properties are best under 160 deg. f.

Key Benefits

Corrosion Protection, Base for Painting, Low Electrical Contact Resistance.

AMS-QQ-P-35, Type II, VI, VII, VIII; ASTM A-967; ASTM A380; MIL-STD-5002.

Intended to improve the corrosion resistance of parts made from austenitic, ferritic, and martensitic corrosion-resistant steels of the 200, 300, and 400 series and precipitation hardened corrosion-resistant steels. 440C grades may be exempt from passivation treatments at the discretion of the procuring activity.

Key Benefits

Improve Corrosion Protection on Stainless Steel.

AMS-C 26074, Cl 1,2,3,4 Grades A, B, C; AMS 2404; AMS 2405; SCGPS 06025; ASTM B733; SCGPS 06013.

Electroless nickel is harder and more abrasion resistant than an electro-deposited nickel. Its main uses are hydraulic cylinders, rotating shafts, pistons, gears, thread guides, cutting tools, and dies. Deposit hardness as plated can range in Vickers hardness from about 500 to 600 HVk and can be increased to about 1000 HVk by heat treating. Most coatings contain a certain percentage of phosphorus which is what provides outstanding corrosion protection. Lower porosity makes the coating generally superior to electro-plated nickel in corrosion protection thickness for thickness and can be improved with heat treatment. Coating thickness is very uniform even in holes and recesses since no electricity is used in the process. The coating also has non-magnetic properties.

Key Benefits

Even Deposit Hardness, Corrosion Resistance, Non-Magnetic.

Mil-A-8625 Type III, Cl 1 and 2; AMS 2469.

Harder and thicker than conventional anodic coatings, hard anodize coatings for aluminum are chiefly used for their wear-resistant characteristics. Normally, appearance and to a lesser extent resistance to corrosion are secondary attributes. Normally, hard anodic coatings are not sealed because sealing can reduce abrasion resistance from 10 to 20 percent. Despite that fact, these coatings perform well in saline environments and will withstand prolonged salt spray exposure without failure. Hundreds of applications of hard anodize include gears, pistons, fan blades, gun scopes, guide tracks, missile components, and fuel nozzles to name a few. The buildup on each surface of an aluminum part will be about fifty percent of the total thickness of the anodic coating produced.

Key Benefits

Corrosion Resistance, Decorative, Paint Adhesion.