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Phosphate coatings are applied to the surface of ferrous substrates to prevent galling, they provide continued wear protection after initial break-in. The coating is formed via immersion in a dilute phosphoric acid solution and is dark grey in appearance.

The standard measurement method for phosphate coatings is by coating weight, as determined by customer specification. By itself, the phosphate coating offers minimal corrosion protection—the heavier the coating weight the higher the degree of protection, but this protection is significantly enhanced by the application of an oil. Phosphate may also serve as a base for Teflon, Xylan, or paint.

Phosphate is also known by the trade name Parco Lubrite, is sometimes called Parkerizing.

South West Metal Finishing offer both Manganese and Zinc phosphating options.

Phosphate Capabilities

  • Various Coating weights
  • Military certifications
  • Abrasive blasting and phosphate coating performed at a single facility
  • Masking for selective coating application
  • Bulk or rack processing

Example Specifications

  • Defence Standards (Def-Stan)
  • British Standards (BS-EN)

Applications Phosphate Coatings

  • Oil & Gas Industry: couplings, fittings, oil rig components
  • Aerospace: actuator components, fastening systems, and to improve paint adhesion
  • Gears & Bearings: break-in and lubricity
  • Automotive, used in engine components
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