Coatings on metal fasteners - Specification for phosphate or phosphate and oil coatings

Coatings on metal fasteners - Specification for phosphate or phosphate and oil coatings

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1   Scope

This Part of BS 7371 specifies requirements for phosphate or phosphate and oil coatings on metal fasteners and accessories, applied by immersion or spraying.

NOTE 1 Phosphate coatings are primarily intended for application to ferrous, zinc or zinc alloy fasteners.

NOTE 2 Phosphate coatings can be used as an undercoat to improve the corrosion resistance and adhesion of a subsequently applied top coat (e.g. organic coating).

NOTE 3 Phosphate coatings can be used to impart a controlled torque/clamping force relationship to a threaded fastener (see BS 7371: Part 2: 1993).

This Part of BS 7371 should be read in conjuction with the requirements for phosphate and phosphate and oil coatings of BS 7371: Part 1General requirements and selection guidelines.
This Part of BS 7371 also specifies requirements for the following:
  1. a) athe minimum coating mass per unit area;
  2. b) assessment of the corrosion resistance of unused coated parts when subjected to neutral salt spray testing (see for example BS 7479:1991).