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1、International Standard ) 452211 0 1 4 4!l ,NTERNAT,ONAL ORGANIZATION FOR STANDARDIZATIONW.,EMI(nYHAPOHA,7 OPrAHH3AUHA OCTAHAAPTM3AUHM*ORGANlSATlON INTERNATIONALE DE NORMALlSATlON Metallic coatings - Test methods for electrodeposited silver and silver alloy coatings - Part 1 : Determination of coatin
2、g thickness Revgtements mt5talliques - Mkthodes dessai des dkpbts klectrolytiques dargent et dalliages dargent - Partie 1 : Determination de Ikpaisseur du dpbt First edition - 1985-03-15 UDC 669.228.7 : 531.717 Ref. No. IS0 4522/l-1985 (E) Descriptors : coatings, metal coatings, electrodeposited coa
3、tings, silver coatings, decorative coatings, protective coatings, tests, determinatiorl Price based on 2 paqes Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 19:05:45 MDTNo repr
4、oduction or networking permitted without license from IHS -,-,- Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical co
5、mmittees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards
6、adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 452
7、2/l was prepared by Technical Committee ISO/TC 107, Metallic and other non-organic coatings. 0 International Organization for Standardization, 1985 0 Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standar
8、ds 1/9972545001 Not for Resale, 04/25/2007 19:05:45 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 4522/l-1985 (El Metallic coatings - Test methods for electrodeposited silver and silver alloy coatings - Part 1 : Determination of coating thicknes
9、s 0 Introduction The methods given in this part of IS0 4522 are considered to have an adequate accuracy when properly used with test specimens suitable for the particular method. If a referee method is required, it shall be agreed between the parties concerned and shall be selected from the methods
10、given in clauses 3 to 9 for local thickness and 10 and 11 for average thickness. The method chosen shall be one which is expected to yield the most reliable results considering such factors as coating thickness, shape of component, size of component, coating material, basis material, etc. Those meth
11、ods requiring a value for the density of the electrodeposited coating can only be used if the true density of the silver or silver alloy is known. Other test methods may be used if it can be demonstrated that they have a measurement uncertainty of less than 10 %, or that they are as good as or bette
12、r than the methods given in this part of IS0 4522 for the particular application. 1 Scope and field of application This part of IS0 4522 specifies methods for the determination of the thickness of electrodeposited silver and silver alloy coatings for engineering, and decorative and protective pur- p
13、oses. 2 References IS0 1463, Metallic and oxide coatings - Measurement of coating thickness - Microscopical method. IS0 2177, Metallic coatings - Measurement of coating thickness - Coulometric method bv anodic disso1ution.l IS0 2178, Non-magnetic coatings on magnetic substrates - Measurement of coat
14、ing thickness - Magnetic method. IS0 3497, Metallic coatings - Measurement of coating thickness - X-ray spectrometric methods. IS0 3543, Metallic and non-metallic coatings - Measurement of thickness - Beta backscatter method. IS0 3868, Metallic and other non-organic coatings - Measure- ment of coati
15、ng thickness - Fizeau multiple-beam interferometry method. IS0 4518, Metallic coatings - Measurement of coating thickness - Profrlometric method. 3 Microscopical method Use the method specified in IS0 1463, paying particular atten- tion to the requirements for overplating and its limitations when me
16、asuring thin coatings. 4 Coulometric method Use the method specified in IS0 2177. NOTE - Certain addition agents may affect the accuracy of coulometric results. 5 Beta backscatter method Use the method specified in IS0 3543. 6 Magnetic method Use the method specified in IS0 2178. 7 X-ray spectrometr
17、ic method Use the method specified in IS0 3497. 1) At present at the stage of draft. (Revision of IS0 2177.1972.) 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 19:05:45 MDTNo
18、 reproduction or networking permitted without license from IHS -,-,- IS0 4522/l-1985 (E) 8 lnterferometric method Use the method specified in IS0 3868 9 Profilometric method Use the method specified in IS0 4518. 10 Gravimetric method 10.1 Principle Chemical or electrochemical dissolution of the silv
19、er or silver alloy coating (without attacking the substrate) and determina- tion of the mass of the coating. Calculation of the average thickness of the coating from its mass, area and density. 10.2 Stripping solution Use a solution capable of stripping, either chemically or elec- trochemicallv, the
20、 silver or silver alloy without attacking the substrate. NOTE - Silver can be stripped electrolytically from nickel and steel substrates in a solution containing per litre, 90 g of sodium cyanide and 15 g of sodium hydroxide. Carry out the dissolution at room temperature using steel cathodes, mainta
21、ining the voltage between 2 and 6 V. Silver can be stripped from copper or copper alloy substrates by im- mersion at 65 OC in a solution composed of 19 parts by volume of con- centrated sulfuric acid (Q = 164 g/ml) and 1 part by volume of con- centrated nitric acid (Q = 1.42 g/ml). The parts to be s
22、tripped should be thoroughly dry, and water should be kept out of the solution. Silver can be stripped electrolytically from tin alloys in 30 g/l sodium cyanide solution. Carry out the dissolution at room temperature, using steel cathodes, and maintain the voltage at 4 V. 10.3 Procedure Thoroughly d
23、egrease a sample of known area, rinse and dry, if necessary. Weigh the sample. Using the stripping solution (10.2) appropriate to the basis metal, completely remove the silver or silver alloy coating. Thoroughly rinse in running water. Dry and reweigh the sample. 10.4 Expression of results The avera
24、ge coating thickness, d, in micrometres, is given by the equation 10 m d=Ay where m is the loss in mass, in milligrams, of the sample; A is the surface area, in square centimetres, of the coating; Q is the density, in grams per cubic centimetre, of the coating (unless the true IO,6 g/cmashall be use
25、d). value is known, a value of 11 Chemical analysis 11.1 Procedure Dissolve the silver or silver alloy coating from a sample of known area in a suitable reagent (IO.21 and determine the mass of silver in the solution by a suitable analytical method. 11.2 Expression of results The average coating thi
26、ckness, d, in micrometres, is given by the equation 103m d = _- * wan where m is the mass, in milligrams, of the silver; A is the surface area, in square centimetres, of the coating; Q is the density, in grams per cubic centimetre, of the coating; wAg is the silver content, expressed as a percentage
27、 by mass, of the coating. 12 Direct measurement with a micrometer Coatings thicker than 50 pm can, if appropriate, be measured directly with a micrometer by measuring the part before and after electroplating. NOTE - The method is not necessarily valid if two layers of the coating are to be measured
28、and both are included between the platens of the micrometer. 13 Test report The test report shall include at least the following information : a) a reference to this part of IS0 4522, including an iden- tification of the specific method used; b) the result(s) of the test(s) carried out and the form
29、in which these are expressed: c) any unusual features noticed during the determination; d) any operation not included in this part of IS0 4522 or in the International Standards to which reference is made; e) any other relevant information requested by the pur- chaser. 7 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 19:05:45 MDTNo reproduction or networking permitted without license from IHS -,-,-