FAQ

Anodizing is an electrochemical process using an acid electrolyte bath and electrical currents that convert the metal surface into a durable, corrosion-resistant, anodic oxide finish.

Anodizing increases corrosion resistance, and the structure of the coating allows for coloring, improved lubrication, or improved adhesion. 

The most popular alloys used for anodizing are 2000, 5000, 6000, and 7000 series alloys. These alloys will provide consistently excellent quality finishes for hard coat and conventional anodizing.

The brightness degree depends on the alloy type and the surface finish. Hard-tempered alloys produce higher lusters. Aluminum alloys most suitable for bright finishes are 2000, 5357, 5457, 5557, 7016, and 7029. The higher purity alloys are highly recommended.

There are several benefits to anodizing aluminum, all of which are very important. Durability, aesthetics, reduced possibility of fading, corrosion resistance, and abrasion resistance decrease the risk of adhesive failure.

Although bulk anodizing is very beneficial, it’s best utilized when simultaneously anodizing hundreds or thousands of smaller parts. With racking, it allows for careful handling and precise anodizing of the alloy with a low risk of fall out, voids, or other quality issues.

Hard coat is applied by using a suitable electrolyte, typically sulfuric acid cooled to nearly freezing, and applied voltages upwards of 100 volts at an applied current density of 24-36 amps per square foot.

Anodizing provides a thin aluminum oxide layer, which will deteriorate over time. Depending on the thickness and quality of the coating – and the environment that the part is exposed to – the surface could last 10-20 years.

Every component being anodized is done so at different costs. Tooling, process, and equipment are considered when pricing each material job.

At LMC, we provide several specifications depending on customer requests. Mil-spec coatings are the most widely used and performed at LMC. We also offer specialized certifications for military and aerospace applications. (Examples: Nadcap, QAP testing, and product exact process control.)

Manganese phosphate is a type of conversion coating. This coating is produced by subjecting the part to a chemical process that changes the surface of the part. When applied to a steel part, it creates a heavy crystalline finish on the surface. This coating is insoluble, meaning that it can’t be dissolved by another material, thus increasing the part’s strength and wear resistance.

This coating primarily services automotive, defense and weapons, and marine equipment.

Benefits include maximum hardness, increased corrosion resistance, improved lubrication, and excellent adhesion.

Zinc phosphate is primarily used for paint pretreatment, and manganese phosphate for oil coating (great for storage protection, lubricity, and wear resistance).

Our chemistry is kept at proper and precise levels to ensure each step of the process yields the same results all day, every day. Our operators are well-trained and seasoned in every process to ensure positive and consistent results from beginning to end.

Yes, LMC takes very precautionary measures to ensure environmental safety for everyone inside and outside the building. 

LMC is well-rounded in custom metal finishing. With so many different styles of tooling, there’s almost nothing we can’t anodize.

Over 100 companies.

To provide people the tools and inspiration to live and work to their greatest potential, to do great things for themselves and others.

Light Metals Coloring is a privately owned company founded by David Yard in 1945 (Watertown, CT) giving the distinction of being one of the first anodizers in the US.

LMC has been in business for over 75 years.

 North America, Europe, and Mexico.

We provide a full range of skills needed to direct and deliver a successful manufacturing solution, assisting in your strategic direction, procurement planning, system design, security assessment, application development, and systems integration. We have developed a comprehensive, proven methodology based on thousands of transactions in a wide range of industries requiring metal finishing solutions. Our company offers more than 75 years of experience in helping over 100 customers improve their procurement processes and is continuously recognized for adding value to their finished products.