Aluminum Anodizing/

Clear Anodizing

Clear anodizing is an anodizing process that produces a uniform clear film on the surface of various metals, typically aluminum, which provides the metal with increased corrosion and wear resistance. Utilizing the process of electrolytic passivation, this film is an oxide coating, meaning a hard non-reactive surface, which typically has a thickness of less than .0010”.

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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

Clear Anodizing

Clear anodizing is typically a sulfuric acid anodizing process, and as a result, offers better wear resistance than chromic acid anodizing and comparable corrosion resistance. Used in a variety of applications, clear anodizing benefits diverse industries including: architecture, for use in window and door frames, railings and siding; automotive, for use in trim and housings for various exposed parts; printing, for use as commercial photolithography plates; and industrial manufacturing, for sheet metal and various extrusions such as profiles and cases for additional surface protection. Additionally, clear anodizing can be colored by means such as organic dyes and metallic salts to create colors such as red, yellow, blue and green for decorative applications such as jewelry or artwork. Some further benefits of clear anodizing include decreased part maintenance, reduced metal weight, being environmentally-friendly and increased production efficiency.

The clear anodizing process is basically identical to the Type II sulfuric acid anodizing process. A commonly used anodizing process, Type II sulfuric acid requires the metal to be fully immersed into sulfuric acid, a highly corrosive and oil-like acid that is formed from sulfur dioxide. When the metal is immersed in the acid an electric current, generally direct current, is sent through the sulfuric acid and reacts with anodes on the surface of the material. The reaction of the current and the anodes creates the hard outer film of oxidation. After the material is removed from the sulfuric acid bath, it is then sealed through the use of hot water in order to enhance the corrosion-resistant properties of the film. If a color is going to be added, then the dye or salt must be introduced after immersion in the sulfuric acid bath but before sealing, so that when sealed, the color will become locked in. While the addition of color can be eye-catching, clear anodizing allows the natural luster of the metal to shine through. Although aluminum is the most common material used in clear anodizing, other metals may be anodized as well including: titanium, magnesium, zinc, niobium and tantalum.