《BS-EN-13811-2003.pdf》由会员分享,可在线阅读,更多相关《BS-EN-13811-2003.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 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
2、 BS EN 13811:2003 This British Standard was published under the authority of the Standards Policy and Strategy 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 pr
3、eparation was entrusted to Technical Committee STI/41, Specification and methods of test for mechanical coatings, 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
4、 international or European publications referred to in this document may be found in the BSI Catalogue under 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 no
5、t purport to include all the necessary provisions of a contract. Users are responsible for its correct application. 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 co
6、mmittee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; 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 t
7、o 12, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:20 GMT+00:00 2006, Uncontrolled Copy, (c)
8、 BSI 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 diffusion de zinc sur les produits ferreux - Spcifications Sherardisieren - Zink-Diffusio
9、nsberzge 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 conditions for giving this European Standard the status of a national standard without any alter
10、ation. 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 official versions (English, French, German). A version in any other language made by translat
11、ion 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, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Irela
12、nd, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of expl
13、oitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13811:2003 E Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13811:2003 (E) 2 Contents Foreword3 1Scope 4 2Normative references 4 3Terms and de
14、finitions4 4General 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)
15、Information to be 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
16、 (informative) General 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 Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:20 GMT+00:
17、00 2006, Uncontrolled Copy, (c) BSI EN 13811:2003 (E) 3 Foreword This document EN 13811:2003 has been prepared by Technical 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
18、, either by publication of an identical text or by endorsement, at the latest by October 2003, and conflicting national standards 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/CENEL
19、EC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slo
20、vak Republic, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13811:2003 (E) 4 1 Scope This European Standard specifies minimum thickness requirements for three classes of zinc coating ap
21、plied 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 standard does not specify any requirements for the surface condition (finish o
22、r 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 reference, provisions from other publications. These normative references ar
23、e 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 incorporated in it by amendment or revision. For undated references the latest
24、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 determination of the mass per unit area (ISO 1460:1992). EN ISO 2178, Non-magn
25、etic 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 purposes of this European Standard, the following terms and definitions a
26、pply. 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 sherardizing process, and subsequently passivated NOTESherardized coating is r
27、eferred 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, expressed in micrometres, m Licensed Copy: sheffieldun sheffieldun, na, Sun O
28、ct 29 10:11:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 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 requi
29、rements ISO 2064:1996, definition 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
30、of coating thickness obtained from 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 singl
31、e order or a single delivery load 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 a
32、nd total impurities (other than zinc 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 inspecti
33、on lot (3.10) selected for testing. 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 she
34、rardizers custody, unless otherwise specified at the time of ordering by the purchaser. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13811:2003 (E) 6 Table 1 Control sample size related to batch size Number of articles in the batch Min
35、imum 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 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 ap
36、plied by sherardizing are designed to protect ferrous products against corrosion and abrasion. The service life of such coatings in a given environment is approximately proportional to the coating thickness. NOTE 2When thicker coatings than those specified in this European Standard are required for
37、extremely aggressive conditions and/or when an exceptionally long service life is required, their specification should be the subject of agreement between the sherardizer and the purchaser. Table 2 Coating thickness Class of coatingLocal coating thickness (minimum value) / m Class 1515 Class 3030 Cl
38、ass 4545 NOTE 1The three classes of coating thickness given in Table 2 should be suitable for the majority of applications. Guidance on the 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.
39、 The purchaser should seek the advice of the sherardizer in such cases. NOTE 3 The local coating thickness should only be determined in relation 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
40、 magnetic method (EN ISO 2178) or the gravimetric method (EN ISO 1460). The magnetic method is generally more appropriate for routine quality control. NOTEAnnex B provides additional information on the determination of thickness. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 10:11:20 GMT+00
41、:00 2006, Uncontrolled Copy, (c) BSI 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 obtain a result as representative as possible of average
42、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 articles with a significant surface area of less than 1 000 mm
43、2, 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 multiplied by the total number of articles in a control samp
44、le, 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, and representative of, those which would have been chosen
45、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 15 %) than the values for the local thickness. This is i
46、rrelevant 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 the original number of articles (or all the articles, if
47、 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 grounds for rejection of the batch. If the batch is rejected
48、, 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 significant surface exists. If such a suitable area does not exis
49、t, 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. 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 t
链接地址:https://www.31doc.com/p-3740139.html