ISO-4521-1985.pdf
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1、International Standard ,NTERNAT,ONAL ORGAN,ZAT,ON FOR STANDARDIZATION.MEXYHAPOAHAR OPTAHM3ALblA fl0 CTAHAAPTH3ALMH.ORGANlSATlON INTERNATIONALE DE NORMALISATION Metallic coatings - Electrodeposited silver and silver alloy coatings for engineering purposes RewZtements m b) galling (cold welding) will
2、occur when two similar silver surfaces (for example two “bright” or two “dull” coatings) are used in sliding contact. Attention is also drawn to the expression in certain contexts of silver contents in terms of parts per thousand (by mass), also known as “thousandths” (milliemes) or “fineness“. In t
3、his International Standard, percentages by mass to one decimal place are used. 1 Scope and field of application This International Standard specifies requirements for elec- trodeposited coatings of silver and its alloys for electrical, electronic and other engineering applications on metallic and no
4、n-metallic materials. Such coatings may or may not be subject to subsequent machining. It does not apply to coatings on screw threads see IS0 4642, Threaded components - Electroplated coatings components (at present at the stage of draft) or to coatings on sheet or strip in the unfabricated form. 2
5、References IS0 1463, Metallic and oxide coatings - Measurement of coating thickness - Microscopical method. IS0 2964, Metallic and other non-organic coatings - Defi- nitions and conventions concerning the measurement of thickness. IS0 2177, Metallic coatings - Measurement of coating thickness - Coul
6、ometric method by anodic dissolution. 1) IS0 4516, Metallic and related coatings - Vickers and Knoop microhardness tests. I SO 4519, Electrodeposited metallic coatings and related finishes - Sampling procedures for inspection by attributes. IS0 4522, Metallic coatings - Test methods for elec- trodep
7、osited silver and silver alloy coatings - Part 7 : Determination of coating thickness. Part 2 : Adhesion tests. Part 3 : Residual salts test. 2) IS0 4599, Metallic coatings - Thioacetamide corrosion test I TAA test). 1) At present at the stage of draft. (Revision of IS0 2177-1972.) 2) At present at
8、the stage of draft. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 21:29:26 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 4521-1985 (E) IEC Publi
9、cation 68-2-20, Basic environmental testing pro- cedures - Test T : Soldering. h) any requirements for anti-tarnish treatment, the type of treatment and methods of test to be applied; j) requirements for solderability and the method of test to be used (see 11.8); 3 Definitions For the purpose of thi
10、s International Standard, the definitions of IS0 2064, especially the following, apply. k) any requirements for freedom from contamination of the finished product (see 11 .lO). significant surface : The part of the article covered or to be covered by the coating and for which the coating is essentia
11、l for serviceability and/or appearance. 5 Basis material This International Standard specifies no requirements for the condition, finish or surface roughness of the basis material prior to electroplating. However, it should be recognized that the surface roughness of the coating will be dependent on
12、 the initial surface roughness of the basis material and this shall not, therefore, be a cause for rejection of the silver or silver alloy coating. 4 Information to be supplied by the purchaser to the electroplater 4.1 Essential information The following information shall be supplied by the purchase
13、r to the electroplater : a) the number of this International Standard (IS0 4521); 6 Pretreatment b) the classification number of the coating required (see clause 8 and 11.2); 6.1 Mercury compounds shall not be used in the pretreat- ment of basis materials. c) the significant surface of the article t
14、o be electroplated indicated, for example, on drawings or by the provision of suitably marked samples; 6.2 To avoid poor adhesion, it is usual to use a silver strike to prevent the chemical deposition of silver and silver alloys on to the basis material. For electroplating certain alloys, a gold str
15、ike may be preferable. d) the surface appearance (see 11 .l); e) the method(s) of adhesion testing to be employed (see 11.5); 7 Sampling f) the sampling procedure to be adopted (see clause 7). A random sample of the size required by IS0 4519 shall be selected from the inspection lot. The articles in
16、 the sample shall be inspected for conformance to the requirements of this Inter- national Standard and the lot shall be classified as conforming or not conforming to each requirement according to the criteria of the sampling plans in IS0 4519. 4.2 Additional information The following additional inf
17、ormation may be required and, if so, shall be specified by the purchaser : a) the minimum silver content of the coating see 8 cl1 and details of any intentional alloying elements (see 11.4); 8 Classification number b) the nature of the basis material, its surface condition and roughness (see clause
18、5); The classification number comprises : c) any requirements for stress relief before electroplating and/or hydrogen embrittlement relief after electroplating (see clause 9); a) the chemical symbol for the basis metal or for the prin- cipal metal, if an alloy, or in the case of non-metallic materia
19、ls the letters NM followed by an oblique stroke; d) any special requirements, including the thickness, for undercoats (see clauses 6 and 10); b) if appropriate, the chemical symbol(s) for the undercoat metal(s), as shown by the examples given in table 1, follow- ed by an oblique stroke; e) any requi
20、rements for corrosion resistance and/or porosity testing and the methods of test to be used (see 11.3); c) the chemical symbol for silver, Ag, followed if required by a number in parentheses representing the minimum silver content, expressed as a percentage by mass, of the silver coating to one deci
21、mal place; f) the electrical properties of the coating and the methods of test to be used (see 11.6); d) a number indicating the minimum thickness, in micrometres, of the silver or silver alloy coating on the significant surface. g) the microhardness of the coating and the test method from IS0 4516
22、to be used (see 11.7); 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 21:29:26 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 4521-1985 (E) Tabl
23、e 1 - Symbols Examples of complete classification numbers are - a silver coating, having a thickness of 20 pm (mini- mum), on brass, has the classification number Cu/Ag 20 - a 99,9 % silver coating, having a thickness of 10 pm (minimum), on steel, using a nickel undercoat, has the classification num
24、ber Fe/Ni/Ag(99,9) 10. 9 Heat treatment of steels 9.1 General Heat treatment as specified in 9.3 and 9.4 shall be performed on certain basis metals to reduce the risk of damage by hydrogen embrittlement. In all cases, the duration of heat treatment shall commence from the time at which the whole of
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