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 BS EN ISO 10270:2008 This British Standard was published under the authority of the Standards
2、 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, incorporating corrigendum July 1997. It supersedes BS ISO 10270:1995 which is withdrawn. The UK
3、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 secretary. This publication does not purport to include all the necessary provisions of a contract.
4、 Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication Date Comments 30 September 2008 Implementation of corrigendum renumbering BS ISO 10270:1995 as BS EN ISO 10270:2008. Im
5、plementation of ISO corrigendum July 1997. Equation modified in 14.3.2.1EUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO10270 April2008 ICS77.060;27.120.10 EnglishVersion CorrosionofmetalsandalloysAqueouscorrosiontestingof zirconiumalloysforuseinnuclearpowerreactors(ISO 10270:1995/Cor1:1997) Cor
6、rosiondesmtauxetalliagesEssaisdecorrosion aqueusedesalliagesdezirconiumutilissdansles racteursnuclaires(ISO10270:1995/Cor1:1997) KorrosionvonMetallenundLegierungen KorrosionsprfunginwssrigenLsungenfrin KernreaktorenangewendeteZirkoniumlegierungen(ISO 10270:1995/Cor1:1997) ThisEuropeanStandardwasappr
7、ovedbyCENon21March2008. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheC
8、ENManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCENManagementCentrehasthesamestatusas the officialversions. CENmembersarethena
9、tionalstandardsbodiesofAustria,Belgium,Bulgaria,Cyprus,CzechRepublic,Denmark,Estonia,Finland, France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,P ortugal, Romania,Slovakia,Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITT
10、EEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2008CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO10270:2008:EForeword The text of ISO 10270:1995/Cor 1:1997 has been pr
11、epared by Technical Committee ISO/TC 156 “Corrosion of metals and alloys” of the International 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 E
12、uropean Standard shall be given the status of a national standard, either by publication 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
13、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. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement thi
14、s European Standard: 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, Slovakia, Slovenia, Spain, Sweden, Switzerland and the
15、United Kingdom. Endorsement notice The text of ISO 10270:1995/Cor 1:1997 has been approved by CEN as a EN ISO 10270:2008 without any modification. BSI 2008 BSEN ISO10270:2008 iiContents Page 1 Scope 1 2 Normative references 1 3 Definitions 1 3.1 etching 1 3.2 control coupons 1 3.3 high mass gain cou
16、pons 1 4 Principle 1 5 Significance 1 6 Interference 1 7 Reagents and materials 1 8 Apparatus 2 8.1 General 2 9 Hazards 2 10 Sampling, test specimens and test units 2 11 Preparation of apparatus 2 12 Calibration and standardization 3 12.1 High mass gain coupon preparation 3 12.2 Autoclaves 3 12.3 Us
17、e of control coupons 3 12.4 Calibration 4 13 Conditioning 4 13.1 Test water quality 4 13.2 Autoclave load restrictions 4 13.3 Test conditions 4 13.3.1 Temperature 4 13.3.2 Pressure 4 13.3.3 Time 4 13.3.4 Tests 4 13.4 Specimen preparation 4 13.4.1 Etched specimens 4 13.4.2 As-manufacturer specimens 4
18、 14 Procedure 4 14.1 Inspection of specimens 4 14.2 Dimensions, weight and inspection 4 14.3 Autoclaving 5 14.3.1 Placing of test specimens 5 14.3.2 Venting method A 5 14.3.3 Venting method B 5 14.3.4 Closed system method C 5 14.3.5 Refreshed autoclaving, method D 6 14.4 Post-test measurements and i
19、nspection 6 15 Calculation or interpretation of results 6 15.1 Calculation of mass gain 6 15.2 Visual interpretation of surface appearance 6 15.3 Invalid tests 6 16 Test report 7 BSI 2008 BSEN ISO10270:2008 iiiPage Annex A (informative) Guide to specimen preparation 8 A.1 Tubes with a second materia
20、l clad on inner diameter 8 A.2 Cleaning 8 A.3 Etching 8 A.4 Preliminary rinse 8 A.5 Final rinse 9 A.6 Drying 9 Annex B (informative) Bibliography 10 Figure 1 Control coupon and high mass gain coupon positioning for establishingmass gain mean and standard deviation 7 Table 1 6 BSI 2008 BSEN ISO10270:
21、2008 iv1 WARNING This International Standard may involve the use of hazardous materials, operations and equipment (see clause9). It is the responsibility of whoever uses this International Standard to consult and establish appropriate safety and health practices and determine the applicability of re
22、gulatory 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 tested in water at360C or in steam at or above 400C; c) that the tests in steam shall be performed at1
23、0,3MPa (1500psi). 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 alloys, heat treating practices and for the evaluation of welding techniques, and should be utilized in it
24、s 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 provisions which, through reference in this text, constitute provisions of this International Standard. At the time
25、 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 possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO mainta
26、in registers of currently valid International Standards. ISO 5813:1983, Water quality Determination of dissolved oxygen Iodometric method. ISO 5814:1990, Water quality Determination of dissolved oxygen Electrochemical probe method. 3 Definitions For the purposes of this International Standard, the f
27、ollowing 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 validity of the test 3.3 high mass gain coupons zirconium alloy specimens that have been specially heat-tr
28、eated 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 zirconium or its alloys are exposed to high-pressure water or steam at elevated temperatures for 72h or 336h.
29、 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 measurements are either impractical to make or are not required. When so specified, the appearance of the sp
30、ecimen shall be the sole criterion for acceptance. The test pressure in steam shall be 10,3MPa (1500psi). 5 Significance 5.1 Specimens are normally tested after careful etching and rinsing. Specimens with as-manufactured surfaces may also be tested without further surface removal. 5.2 When tubing wi
31、th 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 oxidation may, by contamination of the environment, affect results of other specimens in the autoclave. 7 Reagents a
32、nd materials During the test, unless otherwise stated, only reagents of recognized analytical grade and only water as described in7.4 or 7.5 shall be used. 7.1 Argon gas, welding grade. 7.2 Nitrogen gas for purging or controlling oxygen content. 7.3 Argon-hydrogen mixture for purging to remove oxyge
33、n. 7.4 Grade A water purified water having an electrical resistivity of not less than 1MWcm at25C as measured before the start of the test. BSI 2008 BSEN ISO10270:20082 7.5 Grade B water deionized or demineralized water having an electrical resistivity of not less than0,5MWcm at 25C. Grade A water c
34、an be used instead of grade B water. 7.6 Detergents and solvents for specimen cleaning including ethanol and acetone. 7.7 Concentrated hydrofluoric acid (HF). 7.8 Concentrated nitric acid (HNO 3 ). 7.9 Concentrated sulfuric acid (H 2 SO 4 ). 7.10 Control coupons, as defined in3.2. 7.11 High mass gai
35、n coupons, as defined in3.3. 8 Apparatus 8.1 General The apparatus shall consist of equipment 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
36、the water or steam corrosion tests at elevated temperatures and pressures. 8.2 Etching equipment, 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 fee
37、d for running water rinses. Specimen hangers are generally made of type 300 series stainless 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
38、or N06690 and manufactured to conform to government regulations governing unfired pressure vessels. 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
39、the requirements of this International Standard. Sample holders and other internal accessories are also constructed of type 300 or type 400 series stainless steel, or nickel-base alloys such as UNSgrade N06600 or N06690. 8.4 Specimen size measuring equipment, accurate to50m. 8.5 Analytical balance,
40、accurate to 0,1mg. 9 Hazards 9.1 The chemicals used in preparing specimens for this test 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
41、operation must be in accordance with government regulations and manufacturers instructions. 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 aut
42、oclave vessel in order to accelerate cooling upon the completion of testing. 10 Sampling, 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 b
43、y agreement between the purchaser and the seller as stated in the purchase contract. Total surface area for each specimen shall be a minimum 10cm 2 . 10.2 Each specimen and control coupon shall be individually identified. 11 Preparation of apparatus 11.1 General requirements for new or reworked auto
44、claves (8.3) and parts of autoclaves previously used for testing materials other than in accordance 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 t
45、est specimen, clean the apparatus thoroughly, wipe with ethanol or acetone (7.6), and rinse 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 sh
46、ould be no visible contamination, such as lubricant, residues, dust or dirt, loose oxides or rust, or an oil or grease film on the water surface, internal surface, gasket or head surfaces. BSI 2008 BSEN ISO10270:20083 11.1.2 Clean all new and reworked fixtures and jigs to be used in the autoclave an
47、d rinse in hot grade B water. Autoclave the fixtures and jigs for at least1day at 400C in steam at 10,3 MPa or, preferably, at360C in water. Inspect the parts for corrosion products. If corrosion products are found or electrical resistivity of the residual water after the test measures less than 0,1
48、MWcm, clean and autoclave the parts again. 11.2 General requirements for autoclaves and parts in continuous use for corrosion testing under this International Standard are as follows. All autoclaves, fixtures, parts and jigs that have been in continuous use and have shown satisfactory behaviour in prior tests shall be rinsed with grade B water. The fixtures and jigs for corrosion products shall be inspected after each test and items showing loose corrosion products, shall be r
