Metal Prep & Finishing

We offer a wide range of chemical processes for multiple types of steel and aluminum. 

fine grain zinc

Fine-Grain Zinc

Fine-grain zinc offers moderate bare corrosion protection for steel and other metals prior to painting. This excellent pretreatment conversion coating method works on ferrous metals and zinc/zinc alloy coated metals before paint is applied, meeting U.S. federal specifications and military standards. Learn more →


This pretreatment for steel is a frequent requirement for military applications. Heavy-grain zinc coating often has a thicker and coarser consistency that creates more corrosion resistance by placing more sacrificial zinc on the surface. Learn more →

heavy-grain zinc

Manganese Phosphate

Manganese phosphate is used for its wear resistance and initial break-in properties. The heavy grain of the manganese has excellent oil retention that acts as a lube on moving parts and initial break-in and corrosion resistance. It can also be used as a base for military CARC painting. Learn more →


Iron phosphate acts as the base for painting or powder coating, providing greater adhesion for the paint/powder coat as well as excellent corrosion protection. Please note, Sub Source only offers iron phosphate as a complete paint or powder coat process. It is not available as a standalone dip process. Learn more →

Iron Phosphate
black oxide

Black Oxide

Black oxide is a conversion coating that reacts with the surface creating a black color that provides improved cosmetics compared to the original steel as well as some corrosion protection. The addition of a post treatment of oil will increase the corrosion protection, create a deeper color and can minimize abrasion during break in of mating parts. Learn more →


Passivation is a chemical finishing process that uses nitric or citric acid to remove free iron and other contaminants from stainless steel parts. Upon exposure to air, the chromium and nickel in the alloy forms a thin, protective oxide layer or film, giving the part increased corrosion resistance and longevity. Learn more →

chem film

Chem Film

Chem film, sometimes referred to as chemical conversion coating, chromate coating, or yellow chromate, is a chemical conversion coating used on aluminum parts to improve corrosion protection or to be used as a base for painting. Learn more →

Ultrasonic Cleaning

Ultrasonic cleaning is a cleaning method using high frequency sound waves in a solution. Ultrasonic cleaning is powerful enough to remove tough contaminants, yet gentle enough not to damage the substrate. It provides excellent penetration and cleaning in the smallest crevices and between tightly spaced parts in a cleaning tank. Learn more →

Ultrasonic Cleaning

Vapor Degreasing

Vapor degreasing is a solvent cleaning process in vapor form. The vapors can clean hard to reach areas and parts that are not able to be submerged in a fluid. Learn more →

Pickle and Oil

Pickle and oil uses an acid solution and rinse stage to remove rust or scale from ferrous metals. This provides superior surface preparation for powder coating or painting. Learn more →

pickle and oil
grit blasting

Grit Blasting

  • Aluminum Oxide
  • Garnet
  • Glass Bead
  • Steel Shot/Wheel Machine

Learn more →

Contact Sub Source, Inc. Today

Whether you are looking for more information or are ready to move forward on your project, contact the NADCAP accredited professionals at Sub Source today.

one-stop source

Let our dedicated team of experts coordinate all of your critical and secondary process needs. With our NADCAP accreditation and ISO certification, you can trust us to complete your project with the highest quality standards.