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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

Cicero, IL  |  708-222-5300

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 Cicero, Illinois. 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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Saporito Finishing Co. $$$

Reading, PA  |  610-374-5107

Specializing in color anodizing and chemical brightening for over 60 years, US Anodize has wasted no time in perfecting our aluminum anodizing methods and manufacturing process. We offer aluminum anodizing, PERMODIZE®, chromate conversion, and laser engraving. We serve a variety of industries, including automotive, military, medical, and more. We are capable of completing custom orders in our 50,000 square foot facility through the use of both of our high-volume anodizing lines.

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US Anodize $$$

North Tonawanda, NY  |  716-694-5001

Val-Kro Industrial Plating Inc. is an ISO 9001-certified company specializing in Electroless Nickel Plating, Type II Anodizing, Type III Anodizing, Chromate Conversion, Abrasive Blasting, Passivation, and Superfinishing. We offer a diverse line of Electroless Nickel Coatings with rack, barrel, and wire plating capabilities and can accommodate both low and high-volume production requirements. Val-Kro also offers both Conventional and Hardcoat Anodizing using our proprietary anodizing line.

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Val-Kro, Inc. $$$

Hillside, IL  |  708-547-6680

If you are looking for a durable, aesthetically pleasing finish, look no further. We offer a large array of chemical finishing services. We offer Type II, bright dip anodizing, and hard coat anodizing, as well as an architectural anodizing process and powder coating. Since our inception over 50 years ago, Ace Anodizing has cultivated a reputation of providing quick turnaround times and superior services and products with reliable quality you can trust. Rush services available.

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Ace Anodizing $$$
placeholder image Saporito Finishing Co. US Anodize Val-Kro, Inc. Ace Anodizing

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