BS 4292-2-1989 Method for specifying electroplated coatings of gold and gold alloys Gold and gold alloys for decorative and protective purposes《金和金合金电镀层规定方法 第2部分 装饰或保护用金和金合金》.pdf
《BS 4292-2-1989 Method for specifying electroplated coatings of gold and gold alloys Gold and gold alloys for decorative and protective purposes《金和金合金电镀层规定方法 第2部分 装饰或保护用金和金合金》.pdf》由会员分享,可在线阅读,更多相关《BS 4292-2-1989 Method for specifying electroplated coatings of gold and gold alloys Gold and gold alloys for decorative and protective purposes《金和金合金电镀层规定方法 第2部分 装饰或保护用金和金合金》.pdf(12页珍藏版)》请在麦多课文档分享上搜索。
1、BRITISH STANDARD BS 4292-2: 1989 Method for specifying Electroplated coatings of gold and gold alloys Part2: Gold and gold alloys for decorative and protective purposes UDC669.21:621.357.7.002.2:001.4BS 4292-2:1989 This British Standard, having been prepared under the directionof the Surface Coating
2、s(other than Paints) Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 31August1989 BSI03-1999 First published March1968 First revision August1989 The following BSI references relate to the work on this standard: Committee referenceSRC/5 Draft for comm
3、ent86/55015DC ISBN0580171728 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Surface Coatings (other than Paints) Standards Committee (SRC/-) to Technical CommitteeSRC/5, upon which the following bodies were represented: British Coal Cor
4、poration 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 Assay Offices of G
5、reat Britain Metal Finishing Association Ministry of Defence National Association of Goldsmiths of Great Britain and Ireland Telecommunication Engineering and Manufacturing Association (TEMA) Amendments issued since publication Amd. No. Date of issue CommentsBS 4292-2:1989 BSI 03-1999 i Contents Pag
6、e 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 3 6 Undercoats 3 7 Coatings 3 Table 1 Summary of information required 2 Table 2 Appropriate undercoa
7、ts for use with gold and gold alloy decorative and protective coatings 4 Publications referred to Inside back coverBS 4292-2:1989 ii BSI 03-1999 Foreword This Part of BS4292has been prepared under the direction of the Surface Coatings (other than Paints) Standards Policy Committee. BS4292was first p
8、ublished in1968.This revision differs from the previous edition in that it has been drafted as a method for specifying requirements for electroplated gold and gold alloy coatings, i.e.it is based on requirements to be agreed between the interested parties. It is not intended to replace the requireme
9、nts specified in British Standards for particular articles. It also differs in that coatings for engineering and for decorative purposes are dealt with in separate Parts, and by the introduction of a minimum mass of1mg of gold per square centimetre of surface area. It no longer describes methods of
10、test, previously included in appendices, which are now published separately together with additional tests as BS6670-1toBS6670-6. This Part of BS4292together with Part1, which covers coatings of gold and gold alloys for engineering purposes and is published simultaneously, supersede BS4292:1968, whi
11、ch is withdrawn. As this standard is based on requirements to be agreed between the interested parties, it is not appropriate for any claim to be made that a coating complies with BS4292-2. This Part of BS4292describes a method for specifying electroplated coatings of gold, including gold alloys, fo
12、r use for general decorative purposes and for specialized applications where relatively thick coatings, to withstand continuous wear over considerable periods, are required. Decorative purposes are those for which the appearance of the finished article is of prime importance, while engineering purpo
13、ses are those for which the coating has to fulfil primarily functional tasks, although protection against corrosion may be a requirement in both cases. This Part of BS4292defines gold coatings as pure gold or gold alloy coatings having a pure gold content of at least1mg of gold per square centimetre
14、 of surface area. Where gold alloys are to be specified they contain a minimum of58.5% pure gold and, in the case of multilayer coatings, a minimum of58.5% pure gold in each layer. Attention is drawn to the provisions in Section1and Schedule1of the Hallmarking Act1973in so far as they relate to the
15、description applied to an article that has a coating specified in accordance with this Part of BS4292. According to these provisions it is an offence in the course of a trade or business to apply to an unhallmarked article a description indicating that it is made partly of gold, unless the descripti
16、on is “rolled gold” or “gold plated”. The description “rolled gold” is not appropriate in the case of an electroplated coating. Attention is also drawn to the expression in certain contexts of gold contents in terms of parts per thousand (by mass), also known as “thousandths” (millimes) or “fineness
17、”. 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. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer im
18、munity 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 back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the a
19、mendment table on theinside front cover.BS4292-2:1989 BSI 03-1999 1 1 Scope This Part of BS4292describes a method for specifying requirements for electrodeposited coatings (single-layer, double-layer or multilayer) of gold and its alloys on metallic and non-metallic materials for general decorative
20、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) gold alloy coatings containing less than58.5% by mass of pure gold; or d) coatings containing less than1mg of gold per square centimetre of
21、 surface area. In the case of double-layer and multilayer coatings, the thickness requirements apply to the total gold coating, but the requirements for gold content apply to each layer (see7.1). NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 D
22、efinitions For the purposes of this Part of BS4292,the definitions given in BS5411-1apply together with the following. 2.1 significant 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 gold or gold
23、alloy coating an electrodeposited coating of gold or gold alloy containing at least1mg of gold per square centimetre of surface area and, in addition, a pure gold content not less than58.5% by mass NOTEThe minimum thickness of a pure gold coating satisfying this requirement is0.54m. To meet this min
24、imum mass per unit area, single-layer gold alloy coatings will be necessarily thicker than0.54m. This minimum thickness applies only to gold electrodeposits of greater than98% gold content by mass. 2.3 double-layer gold or gold alloy coating a gold or gold alloy coating consisting of two discrete la
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