《BS EN 13811-2003 Sherardizing. Zinc diffusion coatings on ferrous products. Specification.pdf》由会员分享，可在线阅读，更多相关《BS EN 13811-2003 Sherardizing. Zinc diffusion coatings on ferrous products. Specification.pdf（16页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 13811:2003 Sherardizing Zinc diffusion coatings on ferrous products Specification The European Standard EN 13811:2003 has the status of a British Standard ICS 25.220.40 ? BS EN 13811:2003 This British Standard was published under the authority of the Standards Policy and Strat
2、egy Committee on 13 May 2003 BSI 13 May 2003 ISBN 0 580 41803 0 National foreword This British Standard is the official English language version of EN 13811:2003. The UK participation in its preparation was entrusted to Technical Committee STI/41, Specification and methods of test for mechanical coa
3、tings, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue unde
4、r the section entitled “ International Standards Correspondence Index” , or by using the “ Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct a
5、pplication. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed
6、; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates
7、 when the document was last issued. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13811 April 2003 ICS 25.220.40 English version Sherardizing - Zinc diffusion coatings on ferrous products - Specification Shrardisation - Revtements par
8、diffusion de zinc sur les produits ferreux - Spcifications Sherardisieren - Zink-Diffusionsberzge auf Eisenwerkstoffen - Anforderungen This European Standard was approved by CEN on 20 February 2003. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditi
9、ons for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three offi
10、cial versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Be
11、lgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR
12、NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13811:2003 E EN 13811:2003 (E) 2 Contents Foreword3 1Scope 4 2Normative references 4 3Terms and definitions4 4Genera
13、l requirements5 4.1Zinc dust.5 4.2Information to be supplied by the purchaser5 5Sampling.5 6Coating requirement6 6.1Thickness6 6.2Test methods6 6.2.1General6 6.2.2Reference areas .7 6.2.3Magnetic method .7 6.2.4Gravimetric method.7 7Certificate of conformity .7 Annex A (normative) Information to be
14、supplied by the purchaser to the sherardizer.8 A.1Essential information 8 A.2Additional information.8 Annex B (informative) Determination of thickness9 B.1General9 B.2Microscopic cross-section method .9 B.3Calculation of thickness from mass per unit area (reference method)9 Annex C (informative) Gen
15、eral information10 C.1Sherardizing process 10 C.2Basis material.10 C.3Appearance.10 C.4Adhesion.10 C.5After-treatments.10 C.6Coating thickness10 C.7Additional clearances for threaded fasteners.11 Bibliography12 ? EN 13811:2003 (E) 3 Foreword This document EN 13811:2003 has been prepared by Technical
16、 Committee CEN /TC 262, “Metallic and other inorganic coatings“, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2003, and conflicting national sta
17、ndards shall be withdrawn at the latest by October 2003. Annex A is normative. Annexes B and C are informative. This document includes a Bibliography. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europe
18、an Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland and the United Kingdom. ? EN 13811:2003 (E) 4 1 Scope This European Standard speci
19、fies minimum thickness requirements for three classes of zinc coating applied to ferrous products by the sherardizing process for the purpose of protection against corrosion and abrasion. It also specifies minimum requirements for the zinc dust to be used during the sherardizing process. This standa
20、rd does not specify any requirements for the surface condition (finish or roughness) of the basis material before sherardizing. After-treatments or overcoating of sherardized articles is not covered by this standard. 2 Normative references This European Standard incorporates by dated or undated refe
21、rence, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorpo
22、rated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 10204, Metallic products Types of inspection documents. EN ISO 1460, Metallic coatings Hot dip galvanized coatings on ferrous materials Gravimetric determ
23、ination of the mass per unit area (ISO 1460:1992). EN ISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coating thickness Magnetic method (ISO 2178:1982). EN ISO 3549, Zinc dust pigments for paints Specifications and test methods (ISO 3549:1995). 3 Terms and definitions For the p
24、urposes of this European Standard, the following terms and definitions apply. 3.1 sherardizing solid diffusion process in which articles are heated in close contact with zinc dust and an inert material such as sand 3.2 sherardized coating coating consisting of zinc/iron alloys obtained by the sherar
25、dizing process, and subsequently passivated NOTESherardized coating is referred to in this standard as coating. 3.3 coating mass total mass of zinc/iron alloys per unit area of surface, expressed in grams per square metre, g/m2 3.4 coating thickness total coating thickness of zinc/iron alloys, expre
26、ssed in micrometres, m ? EN 13811:2003 (E) 5 3.5 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 and where the coating must meet all of the specified requirements ISO 2064:1996, definition
27、 3.1 3.6 control sample article, or group of articles, from a lot which is selected for testing 3.7 reference area area within which a specified number of single measurements is required to be made ISO 2064:1996, definition 3.3 3.8 local coating thickness mean value of coating thickness obtained fro
28、m a number of measurements within a reference area in a magnetic or electro-magnetic test 3.9 local coating mass value of coating mass obtained from a single gravimetric test 3.10 inspection lot one or more articles of the same type and size comprising either a single order or a single delivery load
29、 or the number of articles identified as a lot by the sherardizer 4 General requirements 4.1 Zinc dust When determined in accordance with EN ISO 3549 the zinc dust used in the sherardizing process shall contain a mass fraction of not less than 94 % of metallic zinc and total impurities (other than z
30、inc oxide) of not more than 2% mass fraction. 4.2 Information to be supplied by the purchaser Information shall be supplied by the purchaser in accordance with annex A. 5 Sampling A control sample (3.6) for thickness testing shall be taken randomly from each inspection lot (3.10) selected for testin
31、g. The minimum number of articles to form the control sample shall be taken in accordance with Table 1. Alternatively, sampling procedures selected from ISO 2859-1 and ISO 2859-3 may be used. Acceptance inspection shall be undertaken before the products leave the sherardizers custody, unless otherwi
32、se specified at the time of ordering by the purchaser. ? EN 13811:2003 (E) 6 Table 1 Control sample size related to batch size Number of articles in the batch Minimum number of articles in the control sample 1 to 3All 4 to 5003 501 to 1 2005 1 201 to 3 2008 3 201 to 10 00013 Above 10 00020 6 Coating
33、 requirement 6.1 Thickness When tested in accordance with 6.2.3, the local coating thickness shall be not less than the values given in Table 2. NOTE 1Coatings applied by sherardizing are designed to protect ferrous products against corrosion and abrasion. The service life of such coatings in a give
34、n environment is approximately proportional to the coating thickness. NOTE 2When thicker coatings than those specified in this European Standard are required for extremely aggressive conditions and/or when an exceptionally long service life is required, their specification should be the subject of a
35、greement between the sherardizer and the purchaser. Table 2 Coating thickness Class of coatingLocal coating thickness (minimum value) / m Class 1515 Class 3030 Class 4545 NOTE 1The three classes of coating thickness given in Table 2 should be suitable for the majority of applications. Guidance on th
36、e selection of coating thickness is given in C.6. NOTE 2There can be a requirement for specific pre-treatment when thicker coatings, e.g. Class 45, are specified. The purchaser should seek the advice of the sherardizer in such cases. NOTE 3 The local coating thickness should only be determined in re
37、lation to reference areas selected in accordance with 6.2.2. 6.2 Test methods 6.2.1 General The local coating thickness shall be determined in accordance with the magnetic method (EN ISO 2178) or the gravimetric method (EN ISO 1460). The magnetic method is generally more appropriate for routine qual
38、ity control. NOTEAnnex B provides additional information on the determination of thickness. ? EN 13811:2003 (E) 7 6.2.2 Reference areas The number and position of reference areas and their sizes for the gravimetric test shall be chosen with regard to the shape and size of the article(s) in order to
39、obtain a result as representative as possible of average coating mass per unit area. For articles with a significant surface area greater than or equal to 1 000 mm2, there shall be at least one reference area on each article in the control sample. Control sample sizes are given in Table 1. For artic
40、les with a significant surface area of less than 1 000 mm2, there shall be enough articles grouped together to provide at least 1 000 mm2 surface for an individual reference area. Hence, the total number of articles tested shall equal the number of articles required to provide one reference area mul
41、tiplied by the total number of articles in a control sample, in accordance with Table 1 (or the total number of articles sherardized, if that is less). Alternatively, sampling procedures selected from ISO 2859-1 and ISO 2859-3 may be used. 6.2.3 Magnetic method The reference areas shall be within, a
42、nd representative of, those which would have been chosen for the gravimetric method. A minimum of five magnetic test readings shall be taken within each reference area. Because the area over which each measurement is made in this method is very small, individual figures may be lower (typically up to
43、 15 %) than the values for the local thickness. This is irrelevant as only the average value over the whole of each reference area is required to be equal to, or greater than, the local coating thickness minimum value. If the local coating thickness on a control sample does not conform to 6.1, twice
44、 the original number of articles (or all the articles, if that is the lower number) shall be taken from the batch and tested. If this larger control sample conforms to 6.1, the batch shall be deemed to conform. Failure of the larger control sample to meet the requirements of 6.1 shall constitute gro
45、unds for rejection of the batch. If the batch is rejected, individual articles may be submitted for re-testing. When more than five articles have to be taken to make up a reference area of at least 1 000 mm2, a single magnetic measurement shall be taken on each article if a suitable area of signific
46、ant surface exists. If such a suitable area does not exist, the gravimetric method given in EN ISO 1460 shall be used. If a sufficient number of measurements are made within the reference area, effectively the same coating thickness will be determined by the magnetic method as the gravimetric method
47、. 6.2.4 Gravimetric method The mass of sherardized coating per unit area shall be determined in accordance with EN ISO 1460 and the nominal density of the coating in grams per cubic centimetre (g/cm3). In case of dispute, this shall be the referee method. 7 Certificate of conformity When required, t
48、he sherardizer shall provide a certificate of conformity with the requirements of this European Standard (see EN 10204). ? EN 13811:2003 (E) 8 Annex A (normative) Information to be supplied by the purchaser to the sherardizer A.1 Essential information The purchaser shall provide the following inform
49、ation on all relevant documents: a) the number of this European Standard, i.e. EN 13811:200X; b) the class of coating or, alternatively, the minimum coating thickness required (see Table 2). A.2 Additional information The following information may be required for particular purposes and, if so, shall be specified by the purchaser: a) identification of significant surfaces, for example, by drawings or by t