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Hard Anodizing

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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.
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Leading Manufacturers

Dayton, OH  |  937-228-2191

Our standard aluminum anodizing is sure to please! We are able to provide this service to you from our state of the art facility in Dayton, Ohio. We have proven time and time again that we are able to provide many diverse products, and have become known as one of the most versatile companies in the industry. Our capabilities and expertise are what allow us to be able to complete any finishing application with ease. Contact our staff to learn more today!

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Hohman Plating & Manufacturing, Inc. $$$

Jackson, MI  |  517-782-8161

In the world's school, we are at the head of the class. At Elm Plating, we offer world-class services such as aluminum anodizing. Our hardcoat anodizing is of the highest quality and we have fast turnaround times. Constant improvement and quality are each employee's responsibility.

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Elm Plating Company $$$

Seattle, WA  |  206-634-2080

For more than 50 years, the Asko Group of companies has provided a complete range of high-quality services to plate, paint, repair or recondition metal parts for aerospace, electronics and industrial applications. Providing a full range of metal finishing for all shapes and sizes of fabricated and precision-machined parts for aerospace, electronics and industrial customers for more than 30 years. The Asko Group consists of five companies working together to meet your needs.

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The Asko Group $$$

Chatham, ON, Chavies, KY  |  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.

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Dajcor Aluminum Ltd. $$$

Houston, TX  |  713-666-1375

Our company offers outstanding aluminum anodizing services. We will work with you to design the most cost efficient product for your exact applications. These beneficial items are integrated with the best finishing processes. We aim to exceed your expectations and you can count on us to be your one-stop-shop for all of your aluminum anodizing needs. If you have any questions please give one of our representatives a call today!

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Turn-Key Coatings, Inc. $$$
placeholder image Hohman Plating & Manufacturing, Inc. Elm Plating Company The Asko Group Dajcor Aluminum Ltd. Turn-Key Coatings, Inc.

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