ISO INTERNATIONAL STANDARD 27831-1 First edition 2008-10-15 Metallic and other inorganic coatings Cleaning and preparation of metal surfaces- Part 1: Ferrous metals and alloys Revetements metalliques et autres revetements inorganiques- Nettoyageetpreparationdes surfacesmetalliques Partie 1:Metaux ferreux et alliages Referencenumber ISO27831-1:2008(E) @ISO2008 Copyright Inte Standardization thISO No reproduction ornetworking permitedwithout licensefromIHS Not for Resale ISO27831-1:2008(E) PDFdisclaimer This PDF filemay contain embedded typefaces.In accordancewithAdobe's licensing policy,this file maybe printed orviewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing.In downloading this file,parties accept therein the responsibility of not infringing Adobe's licensing policy.The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In theunlikely event thata problemrelatingto it isfound,please inform the Central Secretariat attheaddressgivenbelow. COPYRIGHTPROTECTEDDOCUMENT ? ISO2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, IsO'smemberbodyinthecountryoftherequester. ISOcopyright office Casepostale56.CH-1211Geneva20 Tel. + 41 22 749 01 11 Fax+ 4122 7490947 E-mail [email protected] Web www.iso.org Published in Switzerland ISO2008-Allrightsreserved Noreproductionornetworkingpermitedwithout licensefromIHS Not for Resale ISO27831-1:2008(E) Contents Page Foreword.. vi Introduction.. vii 1 Scope... 2 Normative references ..... 3 Terms and definitions... 2 4 Essential information to be supplied by the purchaser to the processor ......... 5 Requirements.. 3 6 Standard cleaning methods.. 4 7 Non-corrosion-resisting steels,cast ironsand pure irons 7.1 Non-corrosion-resisting steels.... 5 7.1.1 Selection of method of cleaning .. 7.1.2 Stress relief heat treatment. 7.1.3 General degreasing and cleaning ... 5 7.1.3.1 Steelsoftensilestrengthupto1000MPa. 7.1.3.2 Steelsof tensilestrength intherange1000MPa to1400MPa 5 7.1.3.3 Steelsoftensilestrengthintherange1400MPato1800MPa 7.1.3.4 Steels of tensile strength over 1800 MPa... 7.1.4 Preparation prior to electroplating...... 7.1.5 Preparation prior to autocatalytic nickel plating.. 7.1.6 Preparation prior to phosphate treatment.... 7.1.7 Preparation prior to sherardizing... 7.1.8 Preparation prior to hot-dip galvanizing ... 7.1.8.1 Steel items other than castings... 8 7.1.8.2 Steel castings.... 7.1.9 Preparation prior to metal spraying.... 7.1.9.1 Sprayingforprotection against corrosion and high-temperature oxidation... 8 7.1.9.2 Spraying forreclamation (recycling)purposes... 7.1.10 Preparation prior to the application of diffusion coatings. 8 7.1.11 Preparation priorto vitreous enamelling. 9 7.1.11.1 Conventionalenamellingmethod. 7.1.11.2 Alternative enamelling method.. 9 7.1.12 Preparation prior to hot tinning.. 10 7.1.12.1 Preparationforordinarymild-steelsurfaces 10 7.1.12.2 Preparation of non-reactive mild-steel surfaces (TRI process).... 10 7.1.13Preparationpriortophysicalvapourdepositionof cadmiumandaluminium.. 10 7.2 10 7.2.1 Generai degreasing and cieaning .... 10 7.2.2 Preparation prior to electroplating.. 10 7.2.3 Preparation prior to autocatalytic nickel plating... 10 7.2.4 Preparationpriorto phosphatingand the application of other conversion coatings 7.2.5 Preparation prior to hot tinning............. 1 7.2.5.1 "Direct chloride" method (TRI process).. 11 7.2.5.2 Preparationpriortoelectroplatingwithareadilytin-platablemetal 7.2.6 Preparation prior to hot-dip galvanizing .... 7.2.7 Preparation p