Hard Anodizing

A reliable source for Aluminum Anodizing information and leading Aluminum Anodizing Companies.

Unlike the regular process of sulfuric acid anodizing, hard anodizing involves a special electrolysis process that creates a thick layer of aluminum oxide both on and in the surface. This process protects metals and alloys from deterioration, which is why depending on the application it is intended for, this process is preferred. Read More…

Hard Anodizing Hard anodizing is a variant of anodizing. It produces similar results to standard anodized surfaces, but its thicker and denser hard anodic film limits the coloring results to dark tones.

Leading Manufacturers

Westbrook, ME  |  207-761-0392

Silver and gold. Got your attention? We do silver and gold plating as well as aluminum anodizing. As a matter of fact, we also perform copper, gold, nickel and tin plating. We are full-service people. Rack chromic, sulfuric and hardcoat anodizing are some of our processes. FAA, AS 9100 approved.

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Silvex Surface Technology $$$

Chatham, ON  |  877-556-9191

Dajcor Aluminum is the leading Canadian supplier of extruded, fabricated/machined and anodized components and assemblies to the automotive, renewable energy, transportation, building trades, military, recreation, and consumer-product industries. Dajcor is an aluminum extrusion company, with complete value added in-house capabilities – your ‘One-Stop’ extrusion supplier!

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Dajcor Aluminum Ltd. $$$

Dexter, MI  |  734-426-2855

Since 1976 Alpha Metal Finishing has been a trusted leader in anodizing, hardcoat and chemical film (chromate conversion) services. In addition, Alpha now provides stainless steel passivation. We are passionate about providing superior quality, rapid turnaround, and friendly, responsive service. Alpha is ISO 9001:2015 certified. Call us today for your finishing needs!

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Alpha Metal Finishing Company $$$

Syracuse, NY  |  315-471-6143

For over 40 years, Anoplate Corporation has offered high-quality metal finishing services—titanium and aluminum anodizing; anodizing of components; electroless nickel PTFE finishing; plus impregnating services. Our anodizing processes include chromic, sulfuric and hard coat anodizing.

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Anoplate Corporation $$$

Burbank, CA  |  800-497-5569

For over 50 years, K&L Anodizing has provided metal finishing services for manufacturers, machine shops, tool & die, aerospace, medical, government & commercial industries. We provide multicolor anodizing; anodizing per Mil-8625—types I, II, III—dyed & non-dyed; & a variety of related services.

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K & L Anodizing Corporation $$$
placeholder image Silvex Surface Technology Dajcor Aluminum Ltd. Alpha Metal Finishing Company Anoplate Corporation K & L Anodizing Corporation

The sulfuric method of anodizing involves a vat of sulfuric acid that a metal is dipped into while an electrical current is being sent through the vat. The combination of the acid bath and the electrical current is what changes the body chemistry of the metal. Hard anodizing simply cools the acid to the temperature of freezing water and significantly increases the electrical current running through the acid.

Type III Hard Coat Anodized Aluminum Cookware Hard Anodizing - Extrude-A-Trim

This process is usually utilized with aluminum. The process is easier then using regular anodizing treatments on tougher metals, and also costs less and produces a metal that is tough but lightweight. Hard anodizing allows the positive characteristics of aluminum to be utilized. These include low density, exceptional thermal conductivity and electrical resistance, and good pliability.

Hard anodizing is preferred by many industries, for a variety of applications. The automotive industry often uses the process to create internal car parts that will be non-conductive and heat resistant. Cookware used by industrial food processing plants or bakeries are often hard anodized, again because of the thickness and strength that is its trademark.

Also Teflon, which is a non-stick element popular in cookware, adheres to hard anodized metal better then it does to others. Because blood can be so corrosive of metal parts, the medical field commonly uses products put through the hard anodization process for its prosthetic joints and limbs. Another reason this type of metal is preferred is because of its appearance.

Hard anodized aluminum is less porous then aluminum anodized by sulfuric acid. Therefore aesthetically it is a smoother and sleeker end product that is more pleasing to the eye. The colors can not be as bright and vibrant though, because the pore size of the surface will not support them. Therefore, dark brown and black shades are most common, although darker shades of other colors can also be created.

Hard Anodizing Informational Video