Coatings on metal fasteners Specifications for electroplated zinc coatings

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-08-2009

Publisher

British Standards Institution

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.

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.

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	BS 7371-3:1993

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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BS 7371-3:2009

Current

Table of Contents

Abstract

Scope

General Product Information

Standards Referencing This Book

Category

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