BS EN ISO 4541-1979 Metallic and other non-organic coatings - Corrodkote test (CORR test)《金属和其它无机物覆层 涂膏耐蚀试验(CORR试验)》.pdf

1、BRITISH STANDARD BS EN ISO 4541:1995 Incorporating Amendment No. 1 Metallic and other non-organic coatings Corrodkote test (CORRtest) The European Standard EN ISO 4541:1994 has the status of a British StandardBSENISO4541:1995 This British Standard, having been prepared under the directionof the Surf

2、ace Coatings (other than Paints) Standards Committee, was published underthe authority of the Executive Board on 31January1979 BSI 04-2000 The following BSI references relate to the work on this standard: Committee references SRC/15 Draft for comment 76/54497 DC ISBN 0 580 10502 4 Cooperating organi

3、zations The Surface Coatings (other than Paints) Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government department and scientific and industrial organizations: Aluminium Federation* Assay Offices Committee of Great Bri

4、tain Association of Metal Sprayers British Industrial Fasteners Federation* British Jewellery and Giftware Federation Ltd. British Metal Finishing Suppliers Association BNF Metals Technology Centre* British Steel Industry Chemical Industries Association Copper Development Association Electricity Sup

5、ply Industry in England and Wales Electronic Engineering Association* Engineering Equipment Users Association Greater London Council Institute of Metal Finishing* Institute of Sheet Metal Engineers Institute of Vitreous Enamellers Metal Finishing Association* Ministry of Defence* Motor Cycle Associa

6、tion of Great Britain Ltd. Society of Motor Manufacturers and Traders Ltd.* Vitreous Enamel Development Council Zinc Development Association* The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the prepar

7、ation of this British Standard: Association of Manufacturers of Domestic Electrical Appliances British Anodising Association City of London Polytechnic Motor Industry Research Association Non-Destructive Testing Trade Association Telecommunication Engineering and Manufacturing Association Individual

8、 company Amendments issued since publication Amd. No. Date of issue Comments 8509 April 1995 Indicated by a sideline in the marginBSENISO4541:1995 BSI 04-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 0 Introduction 3 1 Scope and field of applicatio

9、n 3 2 References 3 3 Principle 3 4 Corrodkote slurry 3 5 Apparatus 3 6 Test specimens 3 7 Position of test specimens during test 4 8 Conditions in the humidity chamber 4 9 Test cycle 4 10 Period of test 4 11 Treatment of ten specimens after test 4 12 Evaluation of results 4 13 Test report 5 Annex ZA

10、 (normative) Normative references to international publications with their relevant European publications 6 Publications referred to Inside back coverBSENISO4541:1995 ii BSI 04-2000 National foreword This Part of BS5466 is published under the direction of the Surface Coatings (other than Paints) Sta

11、ndards Committee. It is identical with ISO4541:1978 “Metallic coatings Corrodkote corrosion test (CORR test)” which has been prepared, with the active participation and approval of the United Kingdom, by Sub-committee7, Corrosion tests, of Technical Committee107, Metallic and other non-organic coati

12、ngs, of the International Organization for Standardization (ISO). It is intended to publish further Parts as the international work progresses. In 1994 the European Committee for Standardization (CEN) accepted ISO4541:1978 as European Standard ENISO4541:1994. As a consequence of implementing the Eur

13、opean Standard this British Standard is renumbered as BSEN4541 and any reference to BS5466-5 should be read as a reference to BSENISO4541. Terminology and conventions. The text of the International Standard has been approved as suitable for publication, without deviation, as a British Standard. Some

14、 terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker.

15、Where the words “International Standard” appear, referring to this publication, they should be interpreted as “British Standard”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compl

16、iance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard ISO 1462:1973 BS 3745:1970 The evaluation of results of accelerated corrosion tests on metallic coatings (Technically equivalent) ISO 3768:1

17、976 BS 5466 Methods for corrosion testing of metallic coatings Part 1:1977 Neutral salt spray test (NSS test) (Identical) Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN ISO title page, pages2 to6, an inside back cover and a back cover. This standar

18、d has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4541 October 1994 ICS 25.220.30;25.220.40 Descriptors: Metal coatings, chromium coatings,

19、 decorative coatings, corrosion tests, corrodkote tests English version Metallic and other non organic coatings Corrodkote corrosion test (CORR test) (ISO 4541:1978) Revtements mtalliques et autres revtements non organiques Essai de corrosion Corrodkote (Essai CORR) (ISO 4541:1978) Metallische und a

20、ndere anorganische berzge Corrodkote-Korrosionsprfung (CORR-Test) (ISO 4541:1978) This European Standard was approved by CEN on 1994-10-26. 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 natio

21、nal standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any

22、 other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Icela

23、nd, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to C

24、EN members Ref. No. EN ISO 4541:1994 EENISO4541:1994 BSI 04-2000 2 Foreword This European Standard was taken over by the Technical Committee CEN/TC262, Protection of metallic materials against corrosion, from the work of ISO/TC107, Metallic and other inorganic coatings, of the International Organiza

25、tion for Standardization (ISO). CEN/TC262 has decided to submit the final draft for formal vote. The result was positive. 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 April1995, and conflicting

26、 national standards shall be withdrawn at the latest by April1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands,

27、Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. NOTENormative references to international publications are listed inAnnex ZA (normative).ENISO4541:1994 BSI 04-2000 3 0 Introduction In many instances, there is no direct relation between the results of an accelerated corrosion test and t

28、he resistance to corrosion in other media, because several factors which influence the progress of corrosion, such as the formation of protective films, vary greatly with the conditions encountered. The results obtained in the test should not, therefore, be regarded as a direct guide to the corrosio

29、n resistance of the tested materials in all environments where these materials may be used. Furthermore, performance of different materials in the test cannot always be taken as a direct guide to the relative corrosion resistance of these materials in service. 1 Scope and field of application This I

30、nternational Standard specifies the reagent, the apparatus and the procedure for assessment of the quality of metallic and related coatings by the Corrodkote procedure. The method is primarily applicable to copper-nickel-chromium or nickel-chromium electroplated parts. 2 References ISO 1462, Metalli

31、c coatings Coatings other than those anodic to the basis metal Accelerated corrosion tests Method for evaluation of the results. ISO 3768, Metallic coatings Neutral salt spray test (NSS test). 3 Principle Application of a slurry containing corrosive salts to test specimens, allowing the slurry to dr

32、y, and exposure of the coated specimens to a high relative humidity for a specified period of time. 4 Corrodkote slurry Prepare the Corrodkote slurry in a glass beaker by dissolving 0,035g of reagent grade copper(II) nitrate trihydrate Cu(NO 3 ) 2 .3H 2 O, 0,165g of reagent grade iron(III) chloride

33、hexahydrate (FeCl 3 .6H 2 O), and 1,0g of reagent grade ammonium chloride (NH 4 Cl) in 50,0ml of distilled water and stirring into the solution 30,0g of water-washed ceramic grade kaolin. Mix the slurry thoroughly with a glass stirring rod and allow it to stand for about2 min so that the kaolin beco

34、mes saturated. Mix the slurry thoroughly with a glass stirring rod just before using. NOTE 1An alternative method of preparing the Corrodkote slurry is as follows: Weigh2,50g of copper(II) nitrate trihydrate Cu(NO 3 ) 2 .3H 2 O and dilute with distilled water to the mark in a500ml one-mark volumetri

35、c flask. Weigh2,50g of iron(III) chloride hexahydrate (FeCl 3 .6H 2 O), and dilute with distilled water to the mark in a 500ml one-mark volumetric flask. Weigh50,0g of ammonium chloride (NH 4 Cl) and dilute with distilled water to the mark in a 500ml one-mark volumetric flask. Then transfer exactly7

36、,0ml of the copper(II) nitrate solution,33,0ml of the iron(III) chloride solution and 10,0ml of the ammonium chloride solution to a beaker and add30,0g of kaolin. Stir with a glass stirring rod. NOTE 2Keep the iron(III) chloride solution in the dark in a flask fitted with a rubber or glass stopper.

37、The iron(III) chloride solution shall not be more than2 weeks old, since older solutions become unstable. 5 Apparatus 5.1 The apparatus shall consist of a humidity chamber, specimen supports, provision for heating the chamber and provision for air circulation in the chamber. 5.2 The design shall be

38、such that drops of moisture which might accumulate on the roof or walls of the chamber, or on the specimen supports, do not fall on the test specimens. 5.3 The materials of construction shall be such as not to affect the test. 6 Test specimens 6.1 Select the type and number of test specimens to be u

39、sed, as well as the criteria for evaluation of the test results, according to the specification for the coating or products being tested. 6.2 The test specimens may be solvent cleaned prior to testing, using a suitable solvent such as ethanol, diethyl ether, acetone or light petroleum. Do not use so

40、lvents that are corrosive or that deposit protective films. 6.3 Apply the Corrodkote slurry to the test specimens using a clean (paint) brush. Dip the brush in the Corrodkote slurry and, with a circular motion, completely cover the test specimen. Then smooth out the coating by brushing lightly in on

41、e direction. The wet film thickness shall be not less than0,08mm and not more than0,2mm. Allow the test specimens to dry at ambient temperature and at a relative humidity lower than50% for1h before placing them in the humidity chamber. 6.4 If the test specimens are cut from a larger coated article,

42、carry out the cutting in such a way that the coating is not damaged, especially in the area adjacent to the cut. Take care to avoid contamination by swarf during cutting. Unless otherwise specified, protect the cut edges adequately by coating them with a suitable medium that is stable under the cond

43、itions of the test, such as paint, varnish, wax or adhesive tape.ENISO4541:1994 4 BSI 04-2000 7 Position of test specimens during test The position of the test specimens in the humidity chamber during the test is not critical provided that they do not touch each other or the walls, and the supports

44、do not touch the test areas that have been coated with the Corrodkote slurry. 8 Conditions in the humidity chamber Maintain exposure zone of the humidity chamber at38 1 C. Maintain relative humidity of the exposure zone of the chamber between80 and90% and so that condensation is not produced on any

45、of the test specimens. Condensation is permitted on the roof and walls of the chamber if it does not reduce the humidity in the chamber below the minimum80%. NOTEA fan or blower may be used in the chamber to maintain uniform temperature and humidity. Determine the amount of air circulation in the ch

46、amber necessary to maintain these conditions for each chamber. 9 Test cycle 9.1 Unless otherwise specified for the coating or product being tested, the exposure in the humidity chamber shall be continuous for periods up to16h. A single test period up to16h shall be considered as one cycle. Continuou

47、s operation implies that the humidity chamber be closed and operated continuously except for the short interruptions necessary to place or remove test specimens. Schedule operations so that these interruptions are kept to a minimum. 9.2 If more than one test cycle of16h or less is specified, treat t

48、he test specimen as specified in11.1 and11.2 after each test cycle. Apply fresh slurry for each succeeding cycle. After the last test cycle, treat the test specimen as specified in11.1, 11.2 and 11.3. 10 Period of test The period of each test cycle, as well as the number of test cycles required, sha

49、ll be as stated in the specification for the coating or product being tested. 11 Treatment of test specimens after test 11.1 Unless otherwise specified for the material being tested, treat the test specimen after each test cycle as specified in11.2. After the last test cycle, and if the test specimen is to be inspected between test cycles, treat the test specimen as specified in11.2 and11.3. 11.2 Remove the test specimen from the humidity chamber. Examine the test specimens with the slurry intact. Clean the test specimen using fresh running w