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BSI BS 7371-3:2009

Coatings on metal fasteners -- Specifications for electroplated zinc coatings
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BSI BS 7371-3:2009

Coatings on metal fasteners -- Specifications for electroplated zinc coatings

PUBLISH DATE 2009
PAGES 20
BSI BS 7371-3:2009

This Part of BS 7371 specifies requirements for coatings applied by the electrolysis of solutions of zinc.

NOTE The coatings consist principally of zinc and can be lubricated to give controlled torque/clamping force properties when required (see, for example, BS 7371-2).

In addition to the requirements in this Part of BS 7371, the requirements in BS 7371-1 which are applicable to zinc electroplated coatings apply.

This Part of BS 7371 also specifies requirements for:

  1. the coating thickness;

  2. the type of conversion treatment or topcoat to be applied;

  3. quality assessment of the corrosion resistance of unused coated parts when subjected to neutral salt spray testing (for example BS EN ISO 9227); and

  4. an adhesion test.

Zinc electroplated coatings covered by this Part of BS 7371 are for use on fasteners and accessories where the following apply:

  1. A coating giving galvanic protection is required for ferrous fasteners.

  2. A substrate is required to improve the corrosion resistance of subsequent coatings on ferrous fasteners, e.g. organic.

  3. The risk of hydrogen embrittlement of high tensile steel fasteners is acceptable.

SDO BSI: British Standards Institution
Document Number 7371-3
Publication Date Aug. 31, 2009
Language en - English
Page Count 20
Revision Level
Supercedes
Committee FME/9
Publish Date Document Id Type View
Aug. 31, 2009 BS 7371-3:2009 Revision
Sept. 15, 1993 BS 7371-3:1993 Revision