ISO INTERNATIONAL STANDARD 3160-2 Fourth edition 2015-12-15 Watch-cases and accessories Gold alloy coverings - Part 2: Determination of fineness, thickness, corrosion resistance and adhesion Boites de montres et leurs accessoires - Revetements d'alliage d'or - Partie 2: Détermination du titre, de I'épaisseur, de la résistance a la corrosion et de I'adhérence Reference number IS0 3160-2:2015(E) SO International Organization for Standardization @ IS0 2015 HEJIANG INST OF STANDARDIZATION C1 5956617 ed without license from IHS IS0 3160-2:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS02015,PublishedinSwitzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. IsOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel.+41 22 749 0111 Fax+41227490947 [email protected] www.iso.org Intenationai br PrganizationforStandardization icensee-ZHEJIANG INST.OF STANDARDIZoISQ s1.5 - All rights reserved I by IHS unde Not for Resale, 2016/3/29 05:05:25 etworking permitted without license from IHS IS0 3160-2:2015(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 General. ..2 5 Determination of gold fineness .2 5.1 General .2 5.2 Methods of gold fineness determination ..2 6 Determination ofthickness ..3 7 Determination of the corrosion resistance .3 7.1 Forms of corrosion .3 7.2 Sampling and preparation. .4 7.2.1 General ..4 7.2.2 Test of finished items (ready-for-use condition) 7.2.3 Test of coating process (without passivation treatment) 4 7.2.4 Non-significant surfaces. ..4 7.3 Continuity of the covering (porosity test) 4 7.3.1 General .4 7.3.2 Test for a copper-containing base metal with or without nickel, and die- cast zinc-based alloys ..4 7.3.3 Test a ferrous base metal .5 7.3.4 Non-determination of base metal 6 7.3.5 Testing with nitric acid vapour. .6 7.4 Synthetic perspiration test .6 7.4.1 Testvessel 7.4.2 Test solution .6 7.4.3 Position of the sample .6 7.4.4 Temperature during the test. .6 7.4.5 Duration of the test. .6 7.5 Neutral saline mist test. .7 7.5.1 General .7 7.5.2 Criteria .7 7.6 Test of the effects of agents containing sulfur .7 7.6.1 Thioacetamide test. 7.6.2 Flowers of sulfur test in a moist atmosphere 8 Adhesion test ..7 Annex A (normative) Method of obtaining a sample of gold alloy covering .8 Annex B (normative) Implementation of the reference methods for the determination of gold alloy coating fineness .10 Annex C (normative) Description of the main tests for determination of the thickness of gold alloy coverings .12 Bibliography ..14 iii NotforResale,2016/3/2905:05:2 See=ZHEJIANG INSTOFSTANDARDIZATION C15956617 ed without license from IHS