The Difference Between Chem Film vs. Anodize, Part 3: Applications & Industries

Read Part 1 and Part 2 of our three-part series The Difference Between Chem Film vs. Anodize here!

In the final part of our series on the difference between chem film vs. anodize, we delve into the practical applications and industries that benefit from these metal finishing techniques. Both chem film and anodizing offer unique advantages, making them suitable for a variety of uses across numerous sectors. From aerospace and automotive to electronics and consumer goods, the choice between chem film and anodize can significantly impact the performance and longevity of metal components. This blog will explore specific examples highlighting how each finishing method is employed in different industries. 

Chem Film vs. Anodized Finishing 

While chem film uses only a chemical process, anodization entails the use of electricity as well as chemicals. Chem film finishing usually entails just submerging aluminum components into a chemical bath at room temperature, though the chemical solution can instead be brushed or sprayed onto components. After a few minutes, these chemicals create a thin protective layer on metal surfaces made up mainly of chromium oxide, after which components are rinsed and dried. Though soft initially, the chem film finish becomes harder as it dries. However, chem film finishes won’t ever be as strong as anodized ones. Though these finishes have their place, especially in applications requiring electrical conductivity, chem film coatings have their limitations.

When comparing chem film vs. anodized metal coatings: 

• Color: Though really just an aesthetic issue, the differences between chem film vs. anodized coatings for decorative applications also give the latter treatment an advantage. Though both treatments allow clear finishes, non-transparent chem film coatings can only be made in a sort of copperish color. While chem film treatments accept paint or powder coatings well, this entails an additional process. Anodized finishes can be dyed in all sorts of different shades.
• Durability: Comparisons between chem film vs. anodized finishes prove the former to be much less durable. Chem film’s relatively soft and thinner coatings are easily scratched or otherwise damaged, which is why it’s often considered an impermanent finish. Chem film finishing is commonly done for prototypes rather than mass-produced parts that must withstand wear or abrasion. Anodized coatings protect surfaces better as they’re harder and thicker.   
• Lubricity: One of the significant differences between chem film vs. anodized coatings involves friction. Chem film finishes enable better adhesion to the surface, while anodized surfaces slide more easily, a plus for parts designed to interact with other parts. For this reason, most mechanical components will have anodized rather than chem film finishes. Additionally, fewer contaminants will adhere to anodized surfaces as they have better lubricity, making them easier to clean than those finished via chem film.

For manufacturers looking to finish their components themselves, chem film is the better option, as it’s quicker, easier, and less costly. Anodization is a complex process that requires considerable expertise and extra infrastructure, often done by specialist third-party providers. Yet, chem film may be the better option as an intermediary step for finishing or for temporary protection, as is the case with prototypes. For components needing tight tolerances, chem film coatings are thinner, so it may be more desirable as they won’t change a part’s dimensions, as anodized finishes are generally thicker.

Industries That Use Chem Film & Anodized Metals

Both chem film and anodized finishes are used across almost all industries for nonferrous metal components. These two techniques are sometimes even used for the same types of products, though the unique qualities each gives to metals often make one method better for specific applications. 

The following industries use chem film and/or anodized metal finishes: 

• Aerospace: Anodized components are used to ensure enduring durability and resistance to corrosion, while anodization also reduces friction between moving parts; chem film finishes are used for parts that are less exposed to the elements but require greater precision as chem film layers are slightly thinner. 
• Architectural: Due to its superior aesthetics, anodized aluminum makes a better fit than chem film for such applications, which is often used to protect decorative architecture against exposure to the elements.
• Automotive: Anodizing is often used for both aesthetic and durable finishes for vehicles, especially exterior components.
• Defense: For military equipment, both processes reduce the shininess of aluminum, keeping items from standing out on the battlefield; however, when comparing chem film vs. anodized coatings, the latter offers better corrosion resistance on its own than chem film coatings, which would require secondary coatings for similar protection. 
• Electronics: Both chem film and anodization finishes are helpful for electronic products, the former when electrical conductivity is needed and the latter when electrical insulation is required.
• Marine: Since anodization withstands corrosive conditions better, anodized finishes are more durable for saltwater applications than chem film finishes.

When considering chem film vs. anodized coatings for parts or products, these are some of the most vital factors to consider. In a nutshell, anodization is generally the better option as a longer-lasting finish, due to its better corrosion and wear resistance. However, parts undergoing a secondary treatment like painting or powder coating may be better suited to chem film coatings. Additionally, chem film finishes offer better electrical and thermal conductivity, while anodized ones provide better insulation against electricity and heat.

To learn more about our metal finishing and plating solutions, including chem film and anodizing, contact the experts at Silvex, Inc. today!