Aluminum Anodizing/

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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Fort Wayne Anodizing
Fort Wayne, IN
800-347-1030
Fort Wayne Anodizing offers a variety of anodizing services, including aluminum anodizing, hard coat anodizing, conventional anodizing & impregnating services. All laboratory testing, research and development is produced in-house to ensure a high level of quality control. As one of the most sophisticated finishers nationwide & environmentally conscious, we meet the demands of numerous industries.
 
Profile Precision Extrusions
Phoenix, AZ
623-936-5599
Profile Precision Extrusions consistently provides the highest quality anodized aluminum extrusions, shapes and tubing. Coating options include clear or color anodizing, sulfuric anodizing, hard coat anodizing and chemical film (clear & gold). Discover the benefits of our aluminum anodizing processes, extending the life of aluminum and enhancing the cosmetic look of aluminum fabricated components.
 
Mid-States Aluminum Corp.
Fond Du Lac, WI
920-922-7207
Mid-States Aluminum has made a commitment to in-house anodizing services because we understand the added value we can provide our customers by keeping this process a part of our full-service approach to aluminum fabrications. We also understand the importance of managing our process and quality control, as we strive to be an eco-minded partner to our customers and our community. Call us today.
 
Tompkins Metal Finishing, Inc.
Batavia, NY
800-234-2116
At Tompkins Metal Finishing, we offer mid to high volume sulfuric acid anodizing. We do pre-cleaning, etching, deoxidizng, anodizing, dyeing & sealing. We can achieve a wide range of surface finishes from bright to dull matte in clear, black, gold, blue & red. Hard coat anodizing is also available with consideration of aluminum alloy, coating thickness, masking requirements & racking instructions.
 
Hillock Anodizing, Inc.
Philadelphia, PA
215-535-8090
Hillock Anodizing provides the finest precision metal finishing to industry. Our production engineering, quality & management staff are aware of the stringent quality & tolerance requirements your parts must adhere to. We welcome your questions and challenges. Our anodizing processes include hard, clear, color (custom and standard), sulfuric, chromic, hard coat with Teflon® & others.
 
Hardcoatings, Inc.
Charlotte, NC
704-377-2996
From start to finish, we do the job right at Hardcoatings. We are the anodizing specialists. We offer aluminum anodizing, clear anodizing, color anodizing, hard coat anodizing and other metal finishes. We provide friendly assistance to determine exactly what you need among our various services.
 
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Industry Information

Hard Anodizing

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. 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. 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.

 

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