BS 4290-1989 Method for specifying electroplated coatings of silver and silver alloys for decorative and protective purposes《装饰或保护用银和银合金电镀层的规范方法》.pdf
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1、BRITISH STANDARD BS 4290:1989 Method for specifying Electroplated coatings of silver and silver alloys for decorative and protective purposes UDC 620.197.6:621.793.3:621.357.7:669.228.7BS4290:1989 This British Standard, having been prepared under the directionof the Surface Coatings (other than Pain
2、ts) Standards Policy Committee, was published under the authority of the Board ofBSI and comes into effect on 29 September 1989 BSI 07-1999 First published March 1968 First revision September 1989 The following BSI references relate to the work on this standard: Committee reference SRC/5 Draft for c
3、omment 86/55014 DC ISBN 0 580 17269 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Surface Coatings (other than Paints) Standards Policy Committee (SRC/-) to Technical Committee SRC/5, upon which the following bodies were represented:
4、 British Coal Corporation British Jewellers Association British Metal Finishing Suppliers Association British Telecommunications plc Cutlery and Silverware Association Electronic Engineering Association Institute of Metal Finishing Institution of Corrosion Science and Technology Joint Committee of A
5、ssay Offices of Great Britain Metal Finishing Association Ministry of Defence National Association of Goldsmiths of Great Britain and Ireland Telecommunications Engineering and Manufacturing Association Amendments issued since publication Amd. No. Date of issue CommentsBS4290:1989 BSI 07-1999 i Cont
6、ents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Information to be supplied by the purchaser to the electroplater 1 4 Basis material 2 5 Coating classification code 2 6 Undercoats 3 7 Coatings 3 8 Anti-tarnish treatments 5 Table 1 Summary of information req
7、uired 2 Table 2 Appropriate undercoats for use with silver and silver alloy decorative and protective coatings 4 Table 3 Recommended range of silver coatings 4 Publications referred to Inside back coverBS4290:1989 ii BSI 07-1999 Foreword This British Standard has been prepared under the direction of
8、 the Surface Coatings (other than Paints) Standards Policy Committee. It gives a method for specifying requirements for electroplated coatings of silver and silver alloys for general decorative purposes. It revises and supersedes BS4290:1968, which is withdrawn. As this standard is based on requirem
9、ents to be agreed between the interested parties, it is no longer appropriate for any claim to be made that a coating complies with BS4290. It is not intended to replace the requirements specified in British Standards for particular articles. In addition, this revision no longer includes appendices
10、containing methods of test as these are now published separately as Parts of BS6669. This British Standard describes methods for specifying electroplated coatings of silver, including silver alloys, for use for general decorative purposes. Decorative purposes are those for which the appearance of th
11、e finished article is of prime importance, while engineering purposes are those for which coating has to fulfil primarily functional tasks, although protection against corrosion may be a requirement in both cases. In contrast to many other coatings applied for decorative and protective purposes, e.g
12、. nickel/chromium coatings, silver coatings frequently have to give protection against considerable wear in service as well as against corrosion. Consequently, the thickness of the silver coating is chosen to give the required protection against wear. For this reason, the significant surfaces of sil
13、ver electroplated articles are often those that are subject to the greatest wear in service. Packaging materials such as paper and cardboard frequently contain small amounts of sulphur compounds which can cause excessive tarnishing of silver and silver alloy electrodeposited articles. Account should
14、 be taken of this when such articles are packed, stored and transported, and the packaging materials should be free from significant contamination of sulphur compounds. Anti-tarnish treatments can be applied to the coatings to prevent or delay tarnishing (see clause8). Attention is drawn to the expr
15、ession in certain contexts of silver contents in terms of parts per thousand (by mass), also known as thousandths (millimes) or “fineness”. In this standard, percentages by mass to one decimal place are used. A British Standard does not purport to include all the necessary provisions of a contract.
16、Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to6, an inside back cover and a
17、back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4290:1989 BSI 07-1999 1 1 Scope This British Standard describes a method for specifying requirements for electrodeposite
18、d coatings of silver and its alloys on metallic and non-metallic materials for decorative and/or protective purposes. This standard is not applicable to: a) coatings on screw threads; b) coatings applied on sheet or strip in the unfabricated form; c) coatings containing less than95% by mass of pure
19、silver; or d) coatings of minimum thickness less than24m. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard, the definitions given in BS5411-1 apply together with the following. 2.1 significant
20、 surface the part of the article covered or to be covered by the coating and for which the coating is essential for serviceability and/or appearance 2.2 silver electroplated the finished state of an article that has been given a coating of silver or silver alloy by electrodeposition having a minimum
21、 thickness of24m and a minimum purity of95% by mass 3 Information to be supplied by the purchaser to the electroplater NOTEA summary of clause references pertaining to this information is given inTable 1. 3.1 Essential information The information listed in a) to f) shall be supplied by the purchaser
22、 to the electroplater. a) The number of this British Standard, i.e. BS4290. b) A detailed indication of the significant surface, e.g. by drawings or by the provision of suitably marked samples and, in addition, the relevant details if the requirements for the finish differ for various parts of the s
23、ignificant surface (see7.3). c) The classification code of the coating required (see clause5) and the method to be used to determine the silver coating thickness, as agreed between the purchaser and the electroplater (see7.3). NOTEThe required silver coating thickness is contained within the coating
24、 classification code. d) The type (bright, matt, etc) of surface finish required indicated, for example, by the provision of a preliminary sample having the required finish supplied by the electroplater for approval by the purchaser (see7.2). NOTEThe final surface finish will be dependent on the ini
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