BS 7371-3:2009
Current
The latest, up-to-date edition.
Coatings on metal fasteners Specifications for electroplated zinc coatings
Hardcopy , PDF
English
31-08-2009
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Application and type of coating
5 Coating
6 Chromate treatment or topcoat
7 Suitability of coatings for components with parallel threads
8 Information to be documented and supplied to the coater
9 Identification
Annexes
Annex A (normative) - Coating thickness for threaded parts
Annex B (normative) - Measurement of coating thickness
Annex C (informative) - Guidance on procedures that may be
adopted to accommodate thick coatings
Bibliography
Describes requirements for coatings applied by the electrolysis of solutions of zinc.
| Committee |
FME/9
|
| DevelopmentNote |
Supersedes BS 7371-3(1993) and 08/30133820 DC. (08/2009)
|
| DocumentType |
Standard
|
| Pages |
20
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
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: the coating thickness; the type of conversion treatment or topcoat to be applied; quality assessment of the corrosion resistance of unused coated parts when subjected to neutral salt spray testing (for example BS EN ISO 9227); and an adhesion test. Zinc electroplated coatings covered by this Part of BS 7371 are for use on fasteners and accessories where the following apply: A coating giving galvanic protection is required for ferrous fasteners. A substrate is required to improve the corrosion resistance of subsequent coatings on ferrous fasteners, e.g. organic. The risk of hydrogen embrittlement of high tensile steel fasteners is acceptable.
| BS 7371-1:1991 | Coatings on metal fasteners Specification for general requirements and selection guidelines |
| BS 3643-1:2007 | ISO metric screw threads Principles and basic data |
| BS 4479-2:1990 | Design of articles that are to be coated Recommendations for electroplated and autocatalytic coatings |
| BS 1210:1963 | Specification for wood screws |
| BS EN ISO 3497:2001 | Metallic coatings. Measurement of coating thickness. X-ray spectrometric methods |
| BS 4479-1:1990 | Design of articles that are to be coated General recommendations |
| BS EN ISO 10683:2014 | Fasteners. Non-electrolytically applied zinc flake coatings |
| BS 7371-2:1993 | Coatings on metal fasteners Specification for torque/clamping force relationship |
| BS EN ISO 2177:2004 | Metallic coatings. Measurement of coating thickness. Coulometric method by anodic dissolution |
| BS EN ISO 9227:2017 | Corrosion tests in artificial atmospheres. Salt spray tests |
| BS 6338:1982 | Specification for chromate conversion coatings on electroplated zinc and cadmium coatings |
| BS EN ISO 2819:1995 | Metallic coatings on metallic substrates. Electrodeposited and chemically deposited coatings. Review of methods available for testing adhesion |
| BS EN ISO 3882:2003 | Metallic and other inorganic coatings. Review of methods of measurement of thickness |
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