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1、BRITISH STANDARD BS EN ISO 10270:2008 Incorporating corrigendum July 1997 Corrosion of metals and alloys Aqueous corrosion testing of zirconium alloys for use in nuclear power reactors ICS 27.120.10; 77.060 ? Licensed CopyChinese University of Hong Kong, 21/10/2008 07:49, Uncontrolled Copy, (c) BSI
2、BS EN ISO 10270:2008 This British Standard was published under the authority of the Standards Board and comes into effect on 15 October 1996 BSI 2008 ISBN 978 0 580 60532 1 National foreword This British Standard is the UK implementation of EN ISO 10270:2008. It is identical with ISO 10270:1995, inc
3、orporating corrigendum July 1997. It supersedes BS ISO 10270:1995 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ISE/NFE/8, Corrosion of metals and alloys. A list of organizations represented on this committee can be obtained on request to its secret
4、ary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication DateComments 30 September
5、2008Implementation of corrigendum renumbering BS ISO 10270:1995 as BS EN ISO 10270:2008. Implementation of ISO corrigendum July 1997. Equation modified in 14.3.2.1 Licensed CopyChinese University of Hong Kong, 21/10/2008 07:49, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE
6、NORM EN ISO 10270 April 2008 ICS 77.060; 27.120.10 English Version Corrosion of metals and alloys - Aqueous corrosion testing of zirconium alloys for use in nuclear power reactors (ISO 10270:1995/Cor 1:1997) Corrosion des mtaux et alliages - Essais de corrosion aqueuse des alliages de zirconium util
7、iss dans les racteurs nuclaires (ISO 10270:1995/Cor 1:1997) Korrosion von Metallen und Legierungen - Korrosionsprfung in wssrigen Lsungen fr in Kernreaktoren angewendete Zirkoniumlegierungen (ISO 10270:1995/Cor 1:1997) This European Standard was approved by CEN on 21 March 2008. CEN members are boun
8、d 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 be obtained on application to the CE
9、N 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 to the CEN Management Centre has the same stat
10、us as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania
11、, Slovakia, Slovenia, 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 2008 CENAll rights of exploitation in any form and by any means reserved wo
12、rldwide for CEN national Members. Ref. No. EN ISO 10270:2008: E Licensed CopyChinese University of Hong Kong, 21/10/2008 07:49, Uncontrolled Copy, (c) BSI Foreword The text of ISO 10270:1995/Cor 1:1997 has been prepared by Technical Committee ISO/TC 156 “Corrosion of metals and alloys” of the Intern
13、ational Organization for Standardization (ISO) and has been taken over as EN ISO 10270:2008 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, either by publicatio
14、n of an identical text or by endorsement, at the latest by October 2008, and conflicting national standards shall be withdrawn at the latest by October 2008. 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
15、 not 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, Cyprus, Czech Republic, Denmark, Eston
16、ia, 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. Endorsement notice The text of ISO 10270:1995/Cor 1:1997 has been appro
17、ved by CEN as a EN ISO 10270:2008 without any modification. BSI 2008 BS EN ISO 10270:2008 ii Licensed CopyChinese University of Hong Kong, 21/10/2008 07:49, Uncontrolled Copy, (c) BSI Contents Page 1Scope1 2Normative references1 3Definitions1 3.1etching1 3.2control coupons1 3.3high mass gain coupons
18、1 4Principle1 5Significance1 6Interference1 7Reagents and materials1 8Apparatus2 8.1General2 9Hazards2 10Sampling, test specimens and test units2 11Preparation of apparatus2 12Calibration and standardization3 12.1High mass gain coupon preparation3 12.2Autoclaves3 12.3Use of control coupons3 12.4Cali
19、bration4 13Conditioning4 13.1Test water quality4 13.2Autoclave load restrictions4 13.3Test conditions4 13.3.1 Temperature4 13.3.2 Pressure4 13.3.3 Time4 13.3.4 Tests4 13.4Specimen preparation4 13.4.1 Etched specimens4 13.4.2 As-manufacturer specimens4 14Procedure4 14.1Inspection of specimens4 14.2Di
20、mensions, weight and inspection4 14.3Autoclaving5 14.3.1 Placing of test specimens5 14.3.2 Venting method A5 14.3.3 Venting method B5 14.3.4 Closed system method C5 14.3.5 Refreshed autoclaving, method D6 14.4Post-test measurements and inspection6 15Calculation or interpretation of results6 15.1Calc
21、ulation of mass gain6 15.2Visual interpretation of surface appearance6 15.3Invalid tests6 16Test report7 BSI 2008 BS EN ISO 10270:2008 iii Licensed CopyChinese University of Hong Kong, 21/10/2008 07:49, Uncontrolled Copy, (c) BSI Page Annex A (informative) Guide to specimen preparation8 A.1Tubes wit
22、h a second material clad on inner diameter8 A.2Cleaning8 A.3Etching8 A.4Preliminary rinse8 A.5Final rinse9 A.6Drying9 Annex B (informative) Bibliography10 Figure 1 Control coupon and high mass gain coupon positioning for establishing mass gain mean and standard deviation7 Table 16 BSI 2008 BS EN ISO
23、 10270:2008 iv Licensed CopyChinese University of Hong Kong, 21/10/2008 07:49, Uncontrolled Copy, (c) BSI 1 WARNING This International Standard may involve the use of hazardous materials, operations and equipment (see clause 9). It is the responsibility of whoever uses this International Standard to
24、 consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1 Scope This International Standard specifies: a) the determination of mass gain; b) the surface inspection of products of zirconium and its alloys when corrosion te
25、sted in water at 360 C or in steam at or above 400 C; c) that the tests in steam shall be performed at 10,3 MPa (1 500 psi). This International Standard is applicable to wrought products, castings, powder metallurgy products and weld metals. This method has been widely used in the development of new
26、 alloys, heat treating practices and for the evaluation of welding techniques, and should be utilized in its entirety to the extent specified for a product acceptance test, rather than merely a means of assessing performance in service. 2 Normative references The following standards contain provisio
27、ns which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possi
28、bility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 5813:1983, Water quality Determination of dissolved oxygen Iodometric method. ISO 5814:1990, Water quality Determination of dissolve
29、d oxygen Electrochemical probe method. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 etching a process for removal of surface metal by action of acids in water 3.2 control coupons zirconium alloy specimens of known performance used to monitor the
30、 validity of the test 3.3 high mass gain coupons zirconium alloy specimens that have been specially heat-treated to produce a mass gain higher than the maximum given in materials acceptance specifications and which are used for verifying the severity of the test procedure 4 Principle Specimens of zi
31、rconium or its alloys are exposed to high-pressure water or steam at elevated temperatures for 72 h or 336 h. The corrosion is normally measured by the gain in mass of the specimens and by the appearance of an oxide film on the specimen surfaces. In some instances, such as weld evaluation, mass gain
32、 measurements are either impractical to make or are not required. When so specified, the appearance of the specimen shall be the sole criterion for acceptance. The test pressure in steam shall be 10,3 MPa (1 500 psi). 5 Significance 5.1 Specimens are normally tested after careful etching and rinsing
33、. Specimens with as-manufactured surfaces may also be tested without further surface removal. 5.2 When tubing with a second material clad on the surface is to be tested, the cladding shall be removed prior to the test. 6 Interference Autoclave loads that have one or more specimens showing gross oxid
34、ation may, by contamination of the environment, affect results of other specimens in the autoclave. 7 Reagents and materials During the test, unless otherwise stated, only reagents of recognized analytical grade and only water as described in 7.4 or 7.5 shall be used. 7.1 Argon gas, welding grade. 7
35、.2 Nitrogen gas for purging or controlling oxygen content. 7.3 Argon-hydrogen mixture for purging to remove oxygen. 7.4 Grade A water purified water having an electrical resistivity of not less than 1 Mcm at 25 C as measured before the start of the test. BSI 2008 BS EN ISO 10270:2008 Licensed CopyCh
36、inese University of Hong Kong, 21/10/2008 07:49, Uncontrolled Copy, (c) BSI 2 7.5 Grade B water deionized or demineralized water having an electrical resistivity of not less than 0,5 Mcm at 25 C. Grade A water can be used instead of grade B water. 7.6 Detergents and solvents for specimen cleaning in
37、cluding ethanol and acetone. 7.7 Concentrated hydrofluoric acid (HF). 7.8 Concentrated nitric acid (HNO3). 7.9 Concentrated sulfuric acid (H2SO4). 7.10 Control coupons, as defined in 3.2. 7.11 High mass gain coupons, as defined in 3.3. 8 Apparatus 8.1 General The apparatus shall consist of equipment
38、 for a) etching the specimens when required; b) measuring the specimens, surface area and mass, the water resistivity and pH, the test temperature and pressure, the etch and rinse temperature; c) performing the water or steam corrosion tests at elevated temperatures and pressures. 8.2 Etching equipm
39、ent, comprising an acid bath, a running water rinse and a deionized water rinse needed for proper metal removal and stain-free rinsing. Polyethylene or polypropylene tanks are commonly used with a bottom feed for running water rinses. Specimen hangers are generally made of type 300 series stainless
40、steel. When many specimens are processed, a mechanical dipper for the etching process is useful. 8.3 Autoclaves, constructed of type 300 series stainless steel or nickel base alloys such as UNS grade N06600 or N06690 and manufactured to conform to government regulations governing unfired pressure ve
41、ssels. The autoclave is fitted with devices for measurement and control of pressure and temperature, safety devices and venting valves. Control systems for pressure and temperature shall be adequate to meet the requirements of this International Standard. Sample holders and other internal accessorie
42、s are also constructed of type 300 or type 400 series stainless steel, or nickel-base alloys such as UNS grade N06600 or N06690. 8.4 Specimen size measuring equipment, accurate to 50 m. 8.5 Analytical balance, accurate to 0,1 mg. 9 Hazards 9.1 The chemicals used in preparing specimens for this test
43、are hazardous. Detailed information on safe handling of organic compounds, acids and products of zirconium and its alloys should be obtained from competent sources. 9.2 High-temperature, high-pressure autoclave operation must be in accordance with government regulations and manufacturers instruction
44、s. 9.3 Hydrogen gas used for addition to the autoclave steam supply must be handled in accordance with guidelines for explosives and inflammable substances. 9.4 Cold water should not be added directly to the autoclave vessel in order to accelerate cooling upon the completion of testing. 10 Sampling,
45、 test specimens and test units 10.1 The size and the quantity of the test specimens, the method of selection, surface preparation and test acceptance criteria shall be specified in the product specification or by agreement between the purchaser and the seller as stated in the purchase contract. Tota
46、l surface area for each specimen shall be a minimum 10 cm2. 10.2 Each specimen and control coupon shall be individually identified. 11 Preparation of apparatus 11.1 General requirements for new or reworked autoclaves (8.3) and parts of autoclaves previously used for testing materials other than in a
47、ccordance with this International Standard are as follows. 11.1.1 Before specimens are tested in a new or re-worked autoclave, or in one having new valves, tubing, gaskets, etc., which are in contact with the test specimen, clean the apparatus thoroughly, wipe with ethanol or acetone (7.6), and rins
48、e twice with grade B water (7.5). Dry the autoclave or auxiliary equipment by vacuum cleaning or drain and wipe with a clean, lint-free cloth and inspect carefully to ensure freedom from contamination. There should be no visible contamination, such as lubricant, residues, dust or dirt, loose oxides
49、or rust, or an oil or grease film on the water surface, internal surface, gasket or head surfaces. BSI 2008 BS EN ISO 10270:2008 Licensed CopyChinese University of Hong Kong, 21/10/2008 07:49, Uncontrolled Copy, (c) BSI 3 11.1.2 Clean all new and reworked fixtures and jigs to be used in the autoclave and rinse in hot grade B water. Autoclave the fixtures and jigs for at least 1 day at 400 C in steam at 10,3 MPa or, preferably, at 360 C in water. Inspect the p