Etching

Definition: Caustic etching is an immersion process that is used for cleaning and removing oxides which provides a consistent, uniform matte finish. The finish is commonly used for deburring, and preparing parts for paint, powder, anodizing, chromating and other metal finishes.

Acid etching is a mild form of cleaning aluminum. The acid etching process JMD follows does not remove material which makes it a great candidate for machined parts with tight tolerance holes. This finish will not dull the material but will remove oxidation from the surface of aluminum.

Passivate

Definition: Passivation is the removal of exogenous iron or iron compounds from the surface of stainless steel by means of a chemical dissolution. The passivation removes contamination left behind from machining and fabricating processes. Contaminants left on the part could result in corrosion and deterioration of the stainless steel.

AMS-2700 (Supersedes AMS-QQ-P-35 & QQ-P-35)

  • Method 1 Nitric Acid
    • Type 6 Low-Temperature Nitric Acid
    • Type 7 Medium-Temperature Nitric Acid
  • Method 2 Citric Acid

ASTM A967 (Supersedes QQ-P-35)

  • Nitric 2
  • Citric 3

Available Processes:

  • Hand-line

Note: Passivate is a RoHS compliant finish.
JMD offers copper sulfate testing as the primary corrosion test.