1、BRITISH STANDARD Corrosion of metals and alloys - Guidelines for exposing and evaluating metals and alloys in surface sea water The European Standard EN IS0 11306 : 1998 has the status of a British Standard ICs 77.060 BS EN IS0 11306:1998 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPY
2、RIGKT LAW STD=BSI BS EN IS0 L130b-ENGL 1998 m 1624bb9 Ob93131 9q5 m BS EN IS0 11306:1998 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 April 1998 National foreword
3、This British Standard reproduces verbatim EN IS0 11306:1998. It is identical with IS0 113W1998. The UK participation in its preparation was entrusted to Technical Committee ISE/NFE/8, Corrosion of metals and ailoys, which has the responsibility to: . ). - aid enquirers to understand the text; - pres
4、ent to the responsible internationaUEuropean committee any enquiries on the interpretation, or proposais for change, and keep the UK interests informed - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can b
5、e obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC standards normaiiy include an annex which lists normative references to international publications with their corresponding European publications. The British Sandards which implement interna
6、tional or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitied “Inteniational Standards Correspondence Index“, or by using the “Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include
7、 all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN I
8、S0 titie page, the EN IS0 foreword page, the IS0 title page, pages ii, pages 1 to 4, an inside back cover and a back cover. Amendments issued since publication Amd. No. I Date I Text affected O BSI 1998 ISBN O 680 29666 3 STDmBSI BS EN IS0 11306-ENGL 1998 = 3b24bb9 Ob93332 881 EUROPEAN STANDARD NORM
9、E EUROPENNE EUROPISCHE NORM EN IS0 11306 February 1998 - ICs Descriptors: see IS0 document English version Corrosion of metals and alloys - Guidelines for exposing and evaluating metals and alloys in surface sea water (IS0 1 1 306: 1 998) Corrosion de mtaux et alliages - Lignes directrices pour lexp
10、osition et lvaluation des mtaux et alliages la surface de Ieau de mer (IS0 11306:1998) Korrosion von Metallen und Legierungen - Richtlinien fr die Auslagerung von Metallen und Legierungen in oberflchennahem - Meerwasser und fr die Auswertung (IS0 11306:1998) This European Standard was approved by CE
11、N on 12 January 1998. CEN members are bound to comply with the CEWCENELEC Internal Regulations which stipulate the condiuons 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
12、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 other language made by translation under the responsibility of a CEN member into its own language and notified to the C
13、entral Secretariat has the same status as the official CEN members are the national standards bodies of Austria, Belgium, Czech Republic. Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands. Noway, Portugal, Spain, Sweden, Switzerland and United Kingdom. - II
14、- i - I versions. m - * * EUROPEAN COMMTTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FOR NORMUNG Central Secretariat: rue de Stassart, 36 8-1050 Brussels O 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Re
15、f. No. EN IS0 11306:1998 E STD-BSI BS EN IS0 L130b-ENGL 1998 m 1b24bb9 Ob93133 718 m EN IS0 11306:1998 Foreword The text of the Intemational Standard IS0 11 306:1998 has been prepared by Technical Committee ISOTTC 156 “Corrosion of metals and alloys“ in collaboration with Technical Committee CENTTC
16、262 “Metallic and other inorganic coatings“, the secretariat of which is held by DIN. 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 1998, and conflicting national standards shall be withd
17、rawn at the latest by August 1998. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Lu
18、xembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard IS0 11306:1998 was approved by CEN as a European Standard without any modification. STD.BSI ES EN IS0 3330b-ENGL 3998 m 3b24bb9 Ob93334 b54 m EN IS0 1
19、1306:1998 INTERNATIONAL STANDARD IS0 11 306 First edition 1998-02-15 Corrosion of metals and alloys - Guidelines for exposing and evaluating metals and alloys in surface sea water Corrosion des mtaux et alliages - Lignes directrices pour lexposition et lvaluation des mtaux et alliages a la surface d
20、e Veau de mer Reference number IS0 1 1306: 1 998(E) STD.BSI BS EN IS0 1130b-ENGL 1998 = 1b24bb9 Ob93L3.5 590 EN IS0 11306:1998 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing Internati
21、onal Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non- governmental, in liaison with I
22、SO, also take pari in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an In
23、ternational Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 1 1306 was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys. Descriptors: metal products, alloys, corrosion, sea water corrosion, tests, corrosion tests,
24、testing conditions, test specimens, rules (instructions). i - STD.BSI BS EN IS0 lL306-ENGL 3998 1624669 Ob93336 423 EN IS0 11306:1998 Corrosion of metals and alloys - GLcidelines for exposing and evaluating metals and alloys in surface sea water 1 Scope 1.1 This International Standard gives guidance
25、 on the conditions and procedures to be followed when conducting exposures of metals and alloys to surface sea water such that meaningful comparisons may be made for different locations. This International Standard applies to exposure areas from above water level which are wet for a significant peri
26、od (splash and tidal zones) down to a depth at which the composition of the sea water is similar to that at the surface. 1.2 This practice gives guidance on procedures for the evaluation of the effects of sea water on metals and alloys. 1.3 Because of the variability and complexity of sea water, exp
27、osures over a minimum period of one year are considered necessary to minimize the influence of these variable factors. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publica
28、tion, 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 IS0 maintain register
29、s of currently valid International Standards. IS0 8407:1991, Corrosion of metals and alloys - Removal of corrosion products from corrosion test specimens. IS0 1 1463:1995, Corrosion of metals and alloys - Evaluation of pitting corrosion. 3 Control specimens It is prudent, because of the inherent var
30、iability in processing conditions, that control specimens be used in corrosion tests. Two kinds of control specimens are needed as follows. A specimen for which performance is well established in the given environment and which actually does corrode (for example, mild steel). Its corrosion rate will
31、 help to determine the length of the test period. A specimen that is known to be normally resistant in the given environment (for example, copper). The purpose of this specimen is to make sure that no unusual conditions, such as chemical pollution, were encountered during the test period. In the cas
32、e of evaluations of aluminium alloys, care should be exercised in the location of these copper specimens (see 6.2). 1 _ STD-BSI BS EN IS0 11306-ENGL 1998 m lb2qbb9 Ob93137 3b3 m EN IS0 11306:1998 4 Test sites 4.1 Test sites shall be chosen at locations representative of natural seawater environments
33、 where the metals or alloys to be tested may be used. Ideally, a natural seawater test site shall be in a protected location where all necessary conditions required for such tests (splash, tidal and full immersion) may be encountered. Unless the intent is to determine the corrosion due to pollution,
34、 the site shall have clean, uncontaminated sea water. Reference shall be made to tropical versus other conditions, and seasonal variations in temperature and in deposition of marine growth on the test panels with a defined “fouling season”. Climatic and atmospheric characteristics may also be import
35、ant in selecting a site where tidal or splash and spray exposures may be conducted. 4.2 Observations of critical water parameters shall be made and reported; depending on the experiment, these typically include water temperature, salinity, conductivity, pH, oxygen content, other compositional parame
36、ters (e.g. ammonia, hydrogen, sulfides, carbon dioxide, heavy metals) and tidal flow (velocity). The periodicity of measurement of water parameters will be a function of the length of exposure and the expected time variation in these parameters. A mean value of the seawater conditions on a monthly b
37、asis is normal. 5 Exposure racks 5.1 Test racks shall be constructed of a material that will remain intact for the entire proposed period of exposure. Monel nickel-copper alloy 400 (UNS No. N04400) has been found to be an excellent material for racks, but is not recommended for holding aluminium spe
38、cimens. Coated aluminium racks (6061 -T6 or 5086-H32) also have given satisfactory service when used with strip insulators (such as polyethylene) and nylon bolts and nuts to mount the specimens. Nonmetallic racks may be used, provided that they have no effect on the corrosion of the specimens. Reinf
39、orced plastic racks may be used. Treated wood is not appropriate for test racks as the preservative may leach out and affect corrosion of the test materials. 5.2 Specimens shall be mounted in the racks so that they are supported by porcelain or plastic insulators and do not make electrical contact w
40、ith each other or with the supporting racks. Rack charts shall be maintained showing the positions of all specimens and exposure data. 5.3 Spacing of the mounted specimens can be important, therefore it is desirable to have sufficient space between surfaces of test specimens to ensure that adequate
41、water flows between them and that with long exposures the accumulated fouling will not block off the surface to the presence of the seawater environment. 5.4 Racks may be suspended by such materials as nylon, polyester or polypropylene rope depending on prevailing conditions. Steel wire rope shall n
42、ot be used. 5.5 Exposure racks shall be suspended so that attached specimens will be oriented vertically and subjected to the full effects of the sea water but free of galvanic contact with other specimens and with minimal sedimentation of silt and debris on the specimen. 6 Specimens 6.1 When the ma
43、terial to be tested is in sheet form, a nominal specimen size of 100 mm by 300 mm is recommended. Specimens may be larger or smaller to suit a particular test. 6.2 If testing of materials in odd shapes (bolts, nuts, pipes, etc.) is desired, it is essential that a means of supporting them in the test
44、 racks be devised. It is important that the specimens be electrically insulated from their respective supports and from each other to prevent formation of galvanic corrosion cells unless this is part of the study. In some instances it is not sufficient to isolate specimens electrically to prevent co
45、rrosion of one material. For example, it is essential to exercise great care with aluminium specimens or racks so that they will not be 2 STD-BSI BS EN IS0 113Ob-ENGL 1798 Lb24bb9 Ob73138 2TT EN IS0 11306:1998 contaminated by copper, which will cause accelerated corrosion of the aluminium. A galvani
46、c couple is not necessary to accelerate the corrosion of aluminium by copper. Copper or alloys containing copper physically located in the vicinity of aluminium may corrode sufficiently so that accelerated corrosion of the aluminium may be caused by copper deposition on the aluminium (see clause 3).
47、 6.3 The total number of test specimens required shall be determined from a knowledge of the duration of the test and the planned removals of the specimens for intermediate evaluations. There is seldom reason to remove and evaluate specimens exposed less than 6 months. For reliable results, a suffic
48、ient number of replicate specimens should be used for removal at each exposure period. Triplicate specimens for each exposure period will usually satisfy this requirement. A suitable removal schedule might be 0,5 y, 1 y, 2 y, 5 y, 10 y and 20 y. In case of uncertainty as to an alloys corrosion resis
49、tance, shorter intervals might be appropriate and corrosion rate data may be used to establish more appropriate exposure periods. In addition, yearly inspections shall be made to ensure that the specimens are intact. 6.4 Unexposed replicate specimens shall be considered for use where comparisons of exposed and unexposed material will be made such as for corrosion effects on mechanical properties or appearance. 7 Preparation of specimens 7.1 Specimens shall be marked in a manner that will ensure identification for the life o
