DIN EN ISO 9226-2012 Corrosion of metals and alloys - Corrosivity of atmospheres - Determination of corrosion rate of standard specimens for the evaluation of corrosivity (ISO 9226.pdf

1、May 2012 Translation by DIN-Sprachendienst.English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 77.

2、060!$|$“1890197www.din.deDDIN EN ISO 9226Corrosion of metals and alloys Corrosivity of atmospheres Determination of corrosion rate of standard specimens for theevaluation of corrosivity (ISO 9226:2012)English translation of DIN EN ISO 9226:2012-05Korrosion von Metallen und Legierungen Korrosivitt vo

3、n Atmosphren Bestimmung der Korrosionsgeschwindigkeit von Standardproben zur Ermittlung derKorrosivitt (ISO 9226:2012)Englische bersetzung von DIN EN ISO 9226:2012-05Corrosion des mtaux et alliages Corrosivit des atmosphres Dtermination de la vitesse de corrosion dprouvettes de rfrence pour lvaluati

4、on dela corrosivit (ISO 9226:2012)Traduction anglaise de DIN EN ISO 9226:2012-05Together with DIN EN ISO9223:2012-05,DIN EN ISO 9224:2012-05 andDIN EN ISO 9225:2012-05supersedesDIN EN 12500:2000-12www.beuth.deDocument comprises 11 pagesIn case of doubt, the German-language original shall be consider

5、ed authoritative.04.12 DIN EN ISO 9226:2012-05 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee ISO/TC 156 “Corrosion of metals and alloys” (Secretariat: SAC, China) and has been adopted as EN ISO 9226:2012 by Technical Committee CEN/T

6、C 262 “Metallic and other inorganic coatings” (Secretariat: BSI, United Kingdom) within the scope of the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standa

7、rds Committee), Working Committee NA 062-01-71 AA Korrosion und Korrosionsschutz. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 8565 DIN EN ISO 8565 ISO 9223 DIN EN ISO 9223 ISO 9224 DIN EN ISO 9224 Amendments This standard differs fr

8、om DIN EN 12500:2000-12 as follows: a) the specifications are now given in four standards (DIN EN ISO 9223, DIN EN ISO 9224, DIN EN ISO 9225 and DIN EN ISO 9226); b) the chemical cleaning procedures for removal of corrosion products have been changed (see Annex A); c) the specifications have been up

9、dated to reflect the current state of technology; d) the standard has been editorially revised. Previous editions DIN EN 12500: 2000-12 National Annex NA (informative) Bibliography DIN EN ISO 8565, Metals and alloys Atmospheric corrosion testing General requirements DIN EN ISO 9223, Corrosion of met

10、als and alloys Corrosivity of atmospheres Classification, determination and estimation 1 DIN EN ISO 9224, Corrosion of metals and alloys Corrosivity of atmospheres Guiding values for the corrosivity categories EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9226 February 2012 ICS 77.060 Sup

11、ersedes EN 12500:2000English Version Corrosion of metals and alloys - Corrosivity of atmospheres - Determination of corrosion rate of standard specimens for the evaluation of corrosivity (ISO 9226:2012) Corrosion des mtaux et alliages - Corrosivit des atmosphres - Dtermination de la vitesse de corro

12、sion dprouvettes de rfrence pour lvaluation de la corrosivit (ISO 9226:2012) Korrosion von Metallen und Legierungen - Korrosivitt von Atmosphren - Bestimmung der Korrosionsgeschwindigkeit von Standardproben zur Ermittlung der Korrosivitt (ISO 9226:2012) This European Standard was approved by CEN on

13、22 January 2012. 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 concerning such national standards may

14、 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 into its own language and notified t

15、o 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, Ireland, Italy, Latvia, Lithuania, Lux

16、embourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CE

17、N All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 9226:2012: EContents Page Foreword . 3 Introduction . 4 1 Scope 5 2 Normative references 5 3 Principle . 5 4 Standard specimens . 6 5 Exposure of standard specimens 6 6 Expression o

18、f results 6 Annex A (informative) Chemical cleaning procedures for removal of corrosion products 8 Bibliography 9 EN ISO 9226:2012 (E) DIN EN ISO 9226:2012-05 2Foreword This document (EN ISO 9226:2012) has been prepared by Technical Committee ISO/TC 156 “Corrosion of metals and alloys“ in collaborat

19、ion with 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, either by publication of an identical text or by endorsement, at the latest by August 2012, and conflictin

20、g national standards shall be withdrawn at the latest by August 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 not be held responsible for identifying any or all such patent rights. This document su

21、persedes EN 12500:2000. 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, Estonia, Finland, France, Germany, Greece, H

22、ungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 9226:2012 has been approved by CEN as a EN ISO 9226:2012 without an

23、y modification. EN ISO 9226:2012 (E) DIN EN ISO 9226:2012-05 3 Introduction The characterization of an atmospheric corrosion test site or of a service location with respect to its corrosivity can be accomplished by determining the corrosion rate of standard specimens exposed for one year to the atmo

24、sphere at the respective location (corrosivity determination). The standard specimens are flat plate specimens of the four standard structural materials: aluminium, copper, steel and zinc. This method represents an economical way of evaluating corrosivity, taking into account all local environmental

25、 influences. EN ISO 9226:2012 (E) DIN EN ISO 9226:2012-05 4WARNING Some of the procedures included in this International Standard entail the use of potentially hazardous chemicals. lt is emphasized that all appropriate safety precautions should be taken. 1 Scope This International Standard specifies

26、 methods which can be used for the determination of corrosion rate with standard specimens. The values obtained from the measurements (corrosion rates for the first year of exposure) are intended to be used as classification criteria for the evaluation of atmospheric corrosivity according to ISO 922

27、3. They can also be used for informative evaluation of atmospheric corrosivity beyond the scope of ISO 9223. 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,

28、 the latest edition of the referenced document (including any amendments) applies. ISO 8407, Corrosion of metals and alloys Removal of corrosion products from corrosion test specimens ISO 8565, Metals and alloys Atmospheric corrosion testing General requirements ISO 9223, Corrosion of metals and all

29、oys Corrosivity of atmospheres Classification, determination and estimation ISO 9224, Corrosion of metals and alloys Corrosivity of atmospheres Guiding values for the corrosivity categories 3 Principle The corrosivity of the exposure locations or of industrial installation sites is deduced from the

30、corrosion rate, calculated from the loss of mass per unit area of standard specimens following the removal of corrosion products from the specimens after exposure periods of one year. In the case of alloys of iron, zinc and copper, mass loss is a proven measure of corrosion damage. In the case of al

31、uminium alloys, mass loss is a valid measure of corrosion. This International Standard describes only evaluation by mass loss and not corrosion penetration. Corrosion rates for the first year of exposure may be used for the calculation of corrosion rates for long-term exposures in accordance with IS

32、O 9224. EN ISO 9226:2012 (E) DIN EN ISO 9226:2012-05 5 4 Standard specimens The specimens are rectangular plates with dimensions of preferably 100 mm 150 mm, but at least 50 mm 100 mm, and a thickness of approximately 1 mm. The materials used to prepare the standard specimens are of current fabricat

33、ion, i.e. steel: unalloyed carbon steel (Cu 0,03 % to 0,10 %, P 0,07 %) zinc: 98,5 % min. copper: 99,5 % min. aluminium: 99,5 % min. Prior to exposure, all specimens shall be solvent degreased. The sample shall be free from oil and grease; in order to achieve this, it may be necessary to use differe

34、nt solvents in successive steps. Steel specimens with visible rust stains or corrosion products on their surfaces shall be polished with 120 grit abrasive paper prior to degreasing to remove these visible corrosion products. The cleaning of metal specimens by sand blasting can result in a surface th

35、at is more prone to corrosion and is therefore not recommended for the cleaning of the standard specimens for corrosivity classification in accordance with ISO 9223. Copper, zinc and aluminium specimens shall not be used if visible corrosion products are present before exposure. NOTE For details on

36、the quality of recommended metallic materials, see the Bibliography. 5 Exposure of standard specimens The exposure of the weighed and marked standard specimens shall be carried out in accordance with the specifications of ISO 8565. Three specimens of each metal shall be exposed for one year, startin

37、g at the beginning of the worst corrosive period of the year (e.g. spring or autumn). After exposure, the corrosion products formed on specimens shall be removed in accordance with the specifications of ISO 8407 and reweighed to the nearest 0,1 mg. The cleaning procedure shall be repeated several ti

38、mes in equal cleaning cycles. NOTE For procedures suitable for chemical cleaning, see Annex A. 6 Expression of results The corrosion rate, rcorr, for each metal, expressed as a mass loss per unit area over time, is given by Equation (1): corrmrA t(1) where rcorris the corrosion rate, expressed in gr

39、ams per square metre per year g/(m2 a); m is the mass loss, expressed in grams (g); A is the surface area, expressed in square metres (m2); t is the exposure time, expressed in years (a). EN ISO 9226:2012 (E) DIN EN ISO 9226:2012-05 6The corrosion rate can also be expressed as a thickness reduction

40、rate given by Equation (2): corrmrA t (2) where rcorris the corrosion rate, expressed in micrometres per year (m/a); is the density of the metal (Fe: 7,86 g/cm3; Zn: 7,14 g/cm3; Cu: 8,96 g/cm3; Al: 2,70 g/cm3); m is the mass loss, expressed in grams (g); A is the surface area, expressed in square me

41、tres (m2); t is the exposure time, expressed in years (a). The test report shall give all single values and their mean values. Any possible anomalies detected before, during and after exposure, which can have an influence of the mean result, shall be specified. EN ISO 9226:2012 (E) DIN EN ISO 9226:2

42、012-05 7 Annex A (informative) Chemical cleaning procedures for removal of corrosion products WARNING When working with dangerous substances (such as chromium trioxide), all necessary safety precautions shall be taken. Material Chemical Time Temperature Remarks Steel 500 ml of hydrochloric acid (HCl

43、 1,19 g/ml) 3,5 g hexamethylene tetramine Distilled water to make up to 1 000 ml 10 min 20 C to 25 C An increased number of pickling intervals or longer times may be required in certain circumstances. Zinc 250 g glycine (NH2CH2COOH) Distilled water to make up to 1 000 ml (saturated solution) 1 min

44、to 10 min 20 C to 25 C Copper 50 g of amidosulfonic acid (sulfamic acid) Distilled water to make up to 1 000 ml 5 min to 10 min 20 C to 25 C Aluminium 50 ml of phosphoric acid (H3PO4, 1,69 g/ml)20 g of chromium trioxide (CrO3) Distilled water to make up to 1 000 ml 5 min to 10 min 80 C If corrosion

45、products remain, follow the procedure below. Aluminium Nitric acid (HNO3, 1,42 g/ml) 1 min to 5 min 20 C to 25 C To avoid reactions that can result in excessive removal of basis metal, remove extraneous deposits and bulky corrosion products. EN ISO 9226:2012 (E) DIN EN ISO 9226:2012-05 8Bibliography

46、 1 EN 485-1, Aluminium and aluminium alloys Sheet, strip and plate Part 1: Technical conditions for inspection and delivery 2 EN 485-2, Aluminium and aluminium alloys Sheet, strip and plate Part 2: Mechanical properties 3 EN 1179, Zinc and zinc alloys Primary zinc 4 EN 1652, Copper and copper alloys Plate, sheet, strip and circles for general purposes 5 EN 10130, Cold rolled low carbon steel flat products for cold forming Technical delivery conditions EN ISO 9226:2012 (E) DIN EN ISO 9226:2012-05 9