EN 4171-2011 en Aerospace series - Paints and varnishes - Test method for determination of phosphoric acid index《航空航天系列 油漆和清漆试验方法测定》.pdf

《EN 4171-2011 en Aerospace series - Paints and varnishes - Test method for determination of phosphoric acid index《航空航天系列 油漆和清漆试验方法测定》.pdf》由会员分享，可在线阅读，更多相关《EN 4171-2011 en Aerospace series - Paints and varnishes - Test method for determination of phosphoric acid index《航空航天系列 油漆和清漆试验方法测定》.pdf（10页珍藏版）》请在麦多课文档分享上搜索。

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 4171:2011Aerospace series Paints andvarnishes Test method fordetermination of phosphoricacid indexBS EN 4171:2011 BRITISH STANDARDNational forewordThis British Standard is

2、the UK implementation of EN 4171:2011.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/65/-/3, Paints, Surface Finish and ProtectiveTreatments for Aerospace Purposes for Aerospace Purposes.A list of organizations represented on this committee can beobtained on request

3、to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012ISBN 978 0 580 75592 7ICS 49.040Compliance with a British Standard cannot confer immunity fromlegal obligat

4、ions.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2012.Amendments issued since publicationDate Text affectedBS EN 4171:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4171 December 2011 ICS 49.040 English Version Aerospa

5、ce series - Paints and varnishes - Test method for determination of phosphoric acid index Srie arospatiale - Peintures et vernis - Mthode dessai pour la dtermination de lindice dacide phosphorique Luft- und Raumfahrt - Beschichtungsstoffe - Prfverfahren zur Bestimmung des Phosphorsure-Index This Eur

6、opean Standard was approved by CEN on 27 August 2011. 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 alteration. Up-to-date lists and bibliographical references c

7、oncerning such national standards may be obtained on application to the CEN-CENELEC 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 translation under the responsibility of a CEN member

8、 into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, I

9、reland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marni

10、x 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4171:2011: EBS EN 4171:2011EN 4171:2011 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Principle 4 5 Apparat

11、us .4 6 Specimen 5 7 Procedure .5 8 Results 6 9 Designation 6 10 Test report 6 BS EN 4171:2011EN 4171:2011 (E) 3 Foreword This document (EN 4171:2011) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out i

12、n accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publica

13、tion of an identical text or by endorsement, at the latest by June 2012, and conflicting national standards shall be withdrawn at the latest by June 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall no

14、t be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark,

15、 Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 4171:2011EN 4171:2011 (E) 4 1 Scope This European test stan

16、dard specifies a method for the titration and determination of the phosphoric acid content of an hydroalcoholic solution for aerospace applications. This test method is relevant for the determination of total acidity and phosphoric acid content in a reactive thinner of a wash primer or in metal clea

17、ners. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 1513, Paints

18、and varnishes - Examination and preparation of test samples (ISO 1513) EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696) EN ISO 15528, Paints, varnishes and raw materials for paints and varnishes - Sampling (ISO 15528) 3 Terms and definitions For the purpos

19、es of this document, the following terms and definitions apply. 3.1 reactive thinner alcoholic phosphoric acid solution, which reacts with the metallic substrate and the base 3.2 metal cleaner aqueous phosphoric acid solution for the removal of slightly oxidic films on aluminium 4 Principle The phos

20、phoric acid content is determined by titration with aqueous solution of sodium or potassium hydroxide after ionisation of the phosphoric acid. Successive pH jumps allow the determination of: total acidity; phosphoric acid content. 5 Apparatus conical flasks: 250 ml; burette: 50 ml or 100 ml; PTFE co

21、ated magnetic stirrer; pipette: 10 ml; buffered solutions (pH = 4,5 and pH = 6,2); indicator solution (helianthine and phenolphtalein); automatic acid/base titrator or glass electrode (and SCE electrode); BS EN 4171:2011EN 4171:2011 (E) 5 1 N sodium or potassium hydroxide solution: (calibrate N usin

22、g phthalic acid). All chemicals are analytical reagent grade. Titration has to be carried out accordingly. 6 Specimen Test specimen shall be taken directly from the original container. See EN ISO 1513 and EN ISO 15528. 7 Procedure In the conical flask containing an accurate volume of 10 ml, (Vs), of

23、 the test specimen, add approximately 150 ml of fresh distilled water in accordance with EN ISO 3696; Introduce the magnetic stirring bar and put the erlenmeyer on the magnetic stirrer; Add few drops of both coloured indicators in case of manual procedure; Introduce the glass electrode and the SCE i

24、n case of pH-f (V) procedure; Using automatic or manual procedure add slowly the alkaline solution and record alkaline solution volume versus pH or colour change; Determine accurately the volume of alkali added to achieve the first and second end points indicated by observed jumps in pH using the po

25、tentiometric method or colour change in the case of the manual procedure. According to the pKa of the phosphoric acid (2,1, 7,2, 12,7) three main pH jumps are theoretically detected, but the two first jumps (pH 4,5 and 9) are detected with good accuracy (see Figure 1); Note V1and V2, the alkaline so

26、lution volume required to obtain these two pH jumps or colour change. Figure 1 Titration of phosphoric acid by a strong base. Typical curve CAUTION In case of solution containing phosphoric acid as only acidic material, theoretically V1 = V2 but due to carbonic acid dissolved in water V2 may be slig

27、htly higher than V1. BS EN 4171:2011EN 4171:2011 (E) 6 8 Results Acid normality: sVV )N(N11= H3PO4content: ()sVVVN3Na12= In order to avoid the contribution of the presence of any other strong acid in the test specimen, for the calculation of the phosphoric acid content only the difference (V2 V1) sh

28、all be used. 9 Designation EXAMPLE Description block PHOSPHORIC ACID INDEX Identity block EN4171 Number of this standard 10 Test report This test standard specifies a method for the titration and determination of the phosphoric acid content of an hydroalcoholic solution used in etch primer activator

29、s for aerospace applications. a) Reference to this European Standard (EN 4171); b) date; c) product designation; d) batch number; e) code number; f) N (Normality of sodium or potassium hydroxide solution); g) N1 (Acid normality); h) Na (H3PO4content); i) test procedure: coloured indicators, pH = f (

30、V). This page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other standards-related publications, information and services. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter.

31、British Standards Institution (BSI)raising standards worldwideBSI Group Headquarters389 Chiswick High Road London W4 4AL UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 Standards are updated by amendment or revision. Users of British Stan-dards should make sure that they possess the latest amendments o

32、r editions.It is the constant aim of BSI to improve the quality of our products and serv-ices. We would be grateful if anyone finding an inaccuracy or ambiguity whileusing this British Standard would inform the Secretary of the technical com-mittee responsible, the identity of which can be found on

33、the inside frontcover.Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001BSI offers Members an individual updating service called PLUS which ensuresthat subscribers automatically receive the latest editions of standards.Tel: +44 (0)20 8996 7669 Fax: +44 (0)20 8996 7001Email: Buying standardsYou may bu

34、y PDF and hard copy versions of standards directly using acredit card from the BSI Shop on the website addition all orders for BSI, international and foreign standards publicationscan be addressed to BSI Customer Services.Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001Email: In response to orders

35、 for international standards, it is BSI policy tosupply the BSI implementation of those that have been publishedas British Standards, unless otherwise requested.Information on standardsBSI provides a wide range of information on national, Europeanand international standards through its Knowledge Cen

36、tre.Tel: +44 (0)20 8996 7004 Fax: +44 (0)20 8996 7005Email: Various BSI electronic information services are also available whichgive details on all its products and services. Tel: +44 (0)20 8996 7111 Fax: +44 (0)20 8996 7048Email: BSI Subscribing Members are kept up to date with standardsdevelopment

37、s and receive substantial discounts on the purchase priceof standards. For details of these and other benefits contact Membership Ad-ministration. Tel: +44 (0)20 8996 7002 Fax: +44 (0)20 8996 7001 Email: Information regarding online access to British Standards via BritishStandards Online can be fou

38、nd at information about BSI is available on the BSI website at www.bsi- subsists in all BSI publications. BSI also holds the copyright,in the UK, of the publications of the international standardization bodies. Ex-cept as permitted under the Copyright, Designs and Patents Act 1988 no ex-tract may b

39、e reproduced, stored in a retrieval system or transmitted in anyform or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the freeuse, in the course of implementing the standard of necessary details such assymbols, and size, type or grade designations. If these details are to be usedfor any other purpose than implementation then the prior written permissionof BSI must be obtained. Details and advice can be obtained from the Copy-right & Licensing Manager.Tel: +44 (0)20 8996 7070Email: