1、BRITISH STANDARDBS EN ISO 16151:2008Corrosion of metals and alloys Accelerated cyclic tests with exposure to acidified salt spray, “dry” and “wet” conditionsICS 77.060g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g5
2、3g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 16151:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 12 January 2006 BSI 2008ISBN 978 0 580 60539 0National forewordThis British Standard is the UK implementati
3、on of EN ISO 16151:2008. It is identical with ISO 16151:2005. It supersedes BS ISO 16151:2005, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee ISE/NFE/8, Corrosion of metals and alloys.A list of organizations represented on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 obtain
4、ed on request to its secretary.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 publicationDa
5、te Comments30 June 2008 This corrigendum renumbers BS ISO 16151:2005 as BS EN ISO 16151:2008EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 16151April 2008ICS 77.060English VersionCorrosion of metals and alloys - Accelerated cyclic tests withexposure to acidified salt spray, dry and wet condit
6、ions (ISO16151:2005)Corrosion des mtaux et alliages - Essais cycliquesacclrs avec exposition au brouillard salin acidifi, enconditions sches et en conditions humides (ISO16151:2005)Korrosion von Metallen und Legierungen -Schnellprfungen unter wechselnder Einwirkung vonsaurem Salzsprhnebel, trockenen
7、 und feuchtenBedingungen (ISO 16151:2007)This European Standard was approved by CEN on 21 March 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-
8、to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder
9、 the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hung
10、ary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: ru
11、e de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 16151:2008: EForeword The text of ISO 16151:2005 has been prepared by Technical Committee ISO/TC 156 “Corrosion of metals and alloys” of the I
12、nternational Organization for Standardization (ISO) and has been taken over as EN ISO 16151:2008 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 publi
13、cation 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
14、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 this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark,
15、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 United Kingdom. Endorsement notice The text of ISO 16151:2005 has been approved by
16、 CEN as a EN ISO 16151:2008 without any modification. BS EN ISO 16151:2008iiiContents Page Introduction v 1 Scope . 1 2 Normative references . 1 3 Test solution 2 3.1 Method A 2 3.1.1 Preparation of acidic 5 % sodium chloride solution . 2 3.2 Method B 3 3.2.1 Preparation of the mixed salt solution .
17、 3 3.2.2 Preparation of the acidic solution. 3 3.2.3 Preparation of the acidified-salt solution . 3 4 Apparatus 4 4.1 Exposure cabinet 4 4.2 Humidity and temperature control 4 4.3 Spraying device 4 4.4 Air saturator 4 4.5 Collecting devices 4 4.6 Air dryer . 5 4.7 Exhaust system. 5 4.8 Drain system
18、. 5 5 Test specimens . 5 6 Arrangement of the test specimens 5 7 Operating conditions 6 8 Continuity of tests 8 9 Duration of tests . 8 10 Treatment of specimens after test 8 11 Evaluation of results. 8 12 Test report . 9 Annex A (informative) Relationship between amount of acidic stock solution add
19、ed to mixed salt solution and pH of the resulting acidified-salt solution . 10 Annex B (informative) Typical apparatus for accelerated cyclic tests with exposure to acidified salt spray, “dry” and “wet” conditions. 11 Annex C (informative) Method of evaluation of the corrosivity of the chamber 13 Bi
20、bliography . 15 BS EN ISO 16151:2008blankvIntroduction Corrosion of metallic materials, with or without corrosion protection, is influenced by many environmental factors, the importance of which may vary with the type of metallic material and with the type of environment. It is impossible, therefore
21、, to design accelerated laboratory corrosion tests in such a way that all environmental factors influencing resistance to corrosion are taken into account. Laboratory tests are, therefore, designed to simulate the effects of the most important factors, which enhance the corrosion of metallic materia
22、ls. The accelerated corrosion-test methods described in this International Standard are designed to simulate and enhance the environmental influence on a metallic material to outdoor climates, where exposure to acid rain and to salt-contaminated conditions occur and may promote corrosion. It has bee
23、n prepared by reference to technical papers and reports (see the Bibliography). The test methods involve cyclic exposure of test specimens to a mist of acidified-salt solution, to drying conditions, and to periods of high humidity. However, the methods are mainly intended for comparative testing and
24、 the results obtained do not permit far-reaching conclusions on the corrosion resistance of the tested metallic material under the whole range of environmental conditions in which they may be used. Nevertheless, the methods provide valuable information on the relative performance of materials expose
25、d to salt/acid rain environments similar to those employed in the test. BS EN ISO 16151:2008blank1Corrosion of metals and alloys Accelerated cyclic tests with exposure to acidified salt spray, “dry” and “wet” conditions 1 Scope This International Standard specifies two accelerated corrosion-test pro
26、cedures, Methods A and B, for the comparative evaluation of metallic materials with or without permanent corrosion protection or temporary corrosion protection in outdoor salt/acid rain environments. It also specifies the apparatus used. The two tests involve cyclic exposure of the specimens to acid
27、ified salt spray, “dry” and “wet” conditions. The particular advantages of the two tests over conventional accelerated tests, such as the neutral salt spray test (NSS) as specified in ISO 9227 lie in their better ability to reproduce the corrosion that occurs in outdoor salt/acid rain environments.
28、They are also useful for evaluating cosmetic corrosion. Method A applies to metals and their alloys, metallic coatings (cathodic), anodic oxide coatings, and organic coatings on metallic materials. Method B applies to steel coated with anodic coatings, and steel coated with anodic coatings covered w
29、ith conversion coatings. 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, the latest edition of the referenced document (including any amendments) applies. I
30、SO 4628-1:2003, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 1: General introduction and designation system ISO 4628-2:2003, Paints and varnishes Evaluation of degradation of coatings De
31、signation of quantity and size of defects, and of intensity of uniform changes in appearance Part 2: Assessment of degree of blistering ISO 4628-3:2003, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appe
32、arance Part 3: Assessment of degree of rusting BS EN ISO 16151:20082 ISO 4628-4:2003, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 4: Assessment of degree of cracking ISO 4628-5:2003, Pa
33、ints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 5: Assessment of degree of flaking ISO 8407:19911), Corrosion of metals and alloys Removal of corrosion products from corrosion test specimens
34、ISO 8993:1989, Anodized aluminium and aluminium alloys Rating system for the evaluation of pitting corrosion Chart method ISO 9227:19901), Corrosion tests in artificial atmospheres Salt spray tests ISO 10289:1999, Method for corrosion testing of metallic and other inorganic coatings on metallic subs
35、trate Rating of test specimens and manufactured articles subjected to corrosion tests ISO 11130:1999, Corrosion of metals and alloys Alternate immersion test in salt solution 3 Test solution The following clauses give instructions for the preparation and use of the solutions used in Methods A and B.
36、 3.1 Method A 3.1.1 Preparation of acidic 5 % sodium chloride solution 3.1.1.1 Neutral 5 % sodium chloride solution A sufficient mass of sodium chloride shall be dissolved in distilled or deionized water, with a conductivity not higher than 20 S/cm at 25 C 2 C, to produce a concentration of 50 g/l 5
37、 g/l. The specific gravity range for a 50 g/l 5 g/l solution shall be 1,029 to 1,036 at 25 C. The sodium chloride shall contain less than 0,001 % mass fraction of copper and less than 0,001 % mass fraction of nickel, as determined by atomic absorption spectrophotometry or another analytical method o
38、f similar sensitivity. It shall not contain more than 0,1 % mass fraction of sodium iodide, or more than a mass fraction of total impurities of 0,5 % calculated for dry salt. If the pH of the prepared solution, measured at 25 C 2 C, is outside the range 6,0 to 7,0, investigate the presence of undesi
39、rable impurities in the salt and/or the water. 3.1.1.2 Acidification The pH of the solution shall be adjusted to a value of 3,5 0,1 at 25 C 2 C, by adding the following reagents to 10 litres of the prepared neutral 5 % sodium chloride solution as follows: 12 ml of nitric acid (HNO3, = 1,42 g/ml); 17
40、,3 ml of sulfuric acid (H2SO4, = 1,84 g/ml); a sufficient quantity of 10 % mass fraction of sodium hydroxide (NaOH) solution, to adjust the pH of the solution to 3,5 0,1 (about 300 ml will be required). 1) Under revision. BS EN ISO 16151:200833.2 Method B 3.2.1 Preparation of the mixed salt solution
41、 The mass of reagent shown in Table 1 shall be dissolved in distilled or deionized water, with a conductivity not higher than 20 S/cm at 25 C 2 C, to produce a stock solution with a concentration of 36 g/l 3,6 g/l. It shall be diluted by 1:6 to produce a mixed salt solution with a concentration of 6
42、,0 g/l 0,6 g/l. The composition of the stock solution is the same as a typical synthetic ocean water shown in ISO 11130:1999, Annex A, A.3 Test solution for simulating the corrosive effects of ocean water. Table 1 Composition and concentration of a stock solution for a mixed salt solution Reagents C
43、oncentration g/l NaCl MgCl2Na2SO4CaCl2KCl NaHCO3KBr H3BO3SrCl2NaF 24,53 5,20 4,09 1,16 0,695 0,201 0,101 0,027 0,025 0,003 WARNING Handling of SrCl2and NaF can be hazardous and shall be resticted to skilled chemists or conducted under their control. 3.2.2 Preparation of the acidic solution To prepar
44、e the acidic solution, 16,2 g of concentrated nitric acid (HNO3, = 1,40 g/ml, with a mass fraction of HNO3equal to 0,65) and 42,5 g of sulfuric acid (H2SO4, = 1,84 g/ml, with a mass fraction of H2SO4equal to 0,96) shall be dissolved in water and diluted to a total volume of 1 litre to make 1 N acid
45、solution with respect to nitric acid and sulfuric acid at an equivalent ratio of NO3/SO42 of 0,4. 3.2.3 Preparation of the acidified-salt solution The prepared acidic solution from 3.2.2 shall be added to the mixed salt solution from 3.2.1 to adjust the pH to 2,5 0,1 at 25 C 2 C. NOTE The relationsh
46、ip between the amount of mixed acidic solution from 3.2.2 and the pH of the acidified-salt solution is shown in Annex A. This solution, with pH value near to 2,5, would have a no-buffering action. BS EN ISO 16151:20084 4 Apparatus All components in contact with the spray or the test solution shall b
47、e made of, or lined with, materials which are resistant to corrosion by the test solution and which do not influence the corrosivity of the sprayed test solution. The apparatus shall include the components described in the following subclauses. 4.1 Exposure cabinet The exposure cabinet shall have a
48、minimum capacity of 0,4 m3. For large-capacity cabinets, during periods of exposure to acidified salt spray, it shall be ensured that the necessary condition of homogeneity and distribution of spray are met. The upper parts of the cabinet shall be designed so that drops of sprayed solution formed on
49、 its surface do not fall on the specimens being tested. The size and shape of the cabinet shall be such that, during periods of exposure to salt mist spray, the rate of collection of solution in the cabinet is within the limits specified in 7.2. NOTE A schematic diagram of one possible design of exposure cabinet and associated apparatus for accelerated cyclic tests with exposure to acidified salt spray, “dry” and “wet” conditions is s
