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Phosphate Coatings & Oil Coatings

zinc phosphate coating - zinc phosphatingClick to enlarge

Phosphate is a coating that is often used on steel parts in order to provide corrosion protection, lubricity, or as a pretreatment for further coatings such as paint or powder coating. Typically, once a part has been phosphated, a further coating of oil is applied which will further increase the corrosion protection of the part. The finish provided by the phosphate coating will be gray to black in appearance.

  • TT-C-490D - Also known as a "light" phosphate coating is used as a pretreatment for coatings such as CARC painting.
  • DOD-P-16232-F - This is known as a "heavy" phosphate which is used for corrosion protection, anti-galling, and for bonding of further paint applications.

Type M - Manganese Phosphate Coatings

  • Class 1: Supplementary preservative treatment or coating, as specified.
  • Class 2: Supplementary treatment with preservative conforming to MIL-PRF-16173, Grade 3 or MIL-PRF-3150.
  • Class 3: No supplementary treatment

Type Z - Zinc Black Phosphate Coatings

  • Class 1: Supplementary preservative treatment or coating, as specified.
  • Class 2: Supplementary treatment with preservative conforming to MIL-PRF-16173, Grade 3 or MIL-PRF-3150.
  • Class 3: No supplementary treatment

Base Materials that phosphate can be applied to are medium and low alloy steels for gray and black phosphate coatings.

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