We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What Is an Anodized Finish?

By Lori Kilchermann
Updated May 17, 2024
Our promise to you
About Mechanics is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At About Mechanics, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

An anodized finish is a clear or colored finish that is chemically applied to the surface of many metals. Used for a variety of purposes, from reducing thread galling on some fasteners to preventing corrosion on others, an anodized finish adds not only protection to the surface of the metal, it adds strength as well. The color of the anodized finish is not always created by colors or dyes, rather the colors are often directly related to the amount of time the piece was left exposed to the anodizing chemicals. There are, however, a large number of dyes that make it possible to create nearly any color on an anodized product.

Softer metals, such as aluminum, can often benefit from the protective properties of an anodized finish. On surfaces that will be removed and replaced in excess, the anodized finish allows lubricants to be infused into the surface of the threads, adding to the ease of installation. A small amount of dye can be introduced into the chemicals in order to give the appearance of something special to an anodized part, and most anodized parts can be anodized into any color desired. The anodizing film is thick enough that it can require a screw hole to be opened up before attempting to drive the screw into the hole.

Any holes that may be machined into the component being anodized should be bored or machined slightly oversize to take into consideration the anodized finish adding slightly to the inside dimensions of the hole. Failure to do this could result in a hole that is too tight to allow the pin or component into the hole once the part is assembled. For anodized surfaces that are not critical to any lubrication properties, sealing is often required for the surface once the anodizing has been completed. Immersion in very hot water is usually all that is required to close the small holes left in the surface of the anodized metal.

By placing the aluminum into a bath of liquid chemicals that are often nothing more than acetone and applying an electrical current through the aluminum component, a chemical reaction occurs that is similar to a type of rust forming on the aluminum. This rust-like material is the anodized finish and actually works to increase the strength of the aluminum's surface. Similar to gold or silver plating, the color of the anodized finish is dependent on the types of metal sheets immersed into the liquid chemicals.

About Mechanics is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Link to Sources
Discussion Comments
About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.

About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.