1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 16539:2013Corrosion of metals andalloys Accelerated cycliccorrosion tests with exposureto synthetic ocean watersalt-deposition process “Dry“ and “wet“ conditions atconstan
2、t absolute humidityBS ISO 16539:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 16539:2013.The UK participation in its preparation was entrusted to TechnicalCommittee ISE/NFE/8, Corrosion of metals and alloys.A list of organizations represented on this com
3、mittee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 73640 7ICS 77.060Co
4、mpliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 28 February 2013.Amendments issued since publicationDate Text affectedBS ISO 16539:2013 ISO 2013Corrosion of metals a
5、nd alloys Accelerated cyclic corrosion tests with exposure to synthetic ocean water salt-deposition process “Dry” and “wet” conditions at constant absolute humidityCorrosion des mtaux et alliages Essais de corrosion cyclique acclre avec exposition leau de mer synthtique par procd de dpt de sel Condi
6、tions “sches” et conditions “humides” taux dhumidit absolue constantINTERNATIONAL STANDARDISO16539First edition2013-03-01Reference numberISO 16539:2013(E)BS ISO 16539:2013ISO 16539:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All rights reserved. Unless otherwise specif
7、ied, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO
8、s member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 16539:2013ISO 16539:2013(E) ISO 2013 All rights reserved iiiContents PageForeword ivIntro
9、duction v1 Scope . 12 Normative references 13 Test solution 23.1 Preparation of the mixed salt solution . 23.2 pH adjustment . 23.3 Preparation of the test solution 24 Apparatus . 34.1 Component protection . 34.2 Exposure cabinet . 34.3 Salt deposition device . 34.4 Temperature and humidity control
10、device . 34.5 Rinse treatment of specimens . 34.6 Types of apparatus 35 Test specimens 46 Salt deposition measurement method 47 Arrangement of the test specimens 48 Operating conditions and procedure 49 Treatment of specimens after test . 910 Continuity of tests . 911 Duration of tests 912 Evaluatio
11、n of results . 913 Test report . 9Annex A (informative) Combined cyclic test instrument with salt deposition unit (two cabinets) .11Annex B (informative) Combined cyclic test instrument with salt deposition unit (one cabinet) .12Annex C (informative) Salt deposition method by manual spraying 13Annex
12、 D (informative) Recommended periods of testing .15Annex E (informative) Methods for evaluation of corrosivity of test .17Bibliography .19BS ISO 16539:2013ISO 16539:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO mem
13、ber bodies). The work of preparing International Standards is normally carried out through ISO 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, governmen
14、tal and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Direct
15、ives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies
16、 casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 16539 was prepared by Technical Committee ISO/TC 156, Corrosion of metals and allo
17、ys.iv ISO 2013 All rights reservedBS ISO 16539:2013ISO 16539:2013(E)IntroductionCorrosion of metallic materials, with or without corrosion protection, is influenced by many environmental factors, the importance of which can vary with the type of metallic materials and with the type of environment. I
18、t is impossible, therefore, 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 most important factors, which enhance the corrosi
19、on of metallic materials.The accelerated corrosion tests described in this International Standard are designed to simulate and enhance the environmental influence on a metallic material of exposure to outdoor climates, where exposure to salt-contaminated conditions occurs and can promote corrosion.
20、It has been prepared by reference to technical papers and reports (see the Bibliography).The particular advantages of two tests described in this International Standard over conventional accelerated tests, such as the neutral salt spray test (NSS) as specified in ISO 9227 and the wet (salt fog)/dry/
21、humidity test as specified in ISO 14993, lies in their better ability to reproduce the corrosion that occurs in atmospheric environments which contain much sea salt.Accelerated corrosion tests to simulate atmospheric corrosion in such environments are intended/expected to include the following requi
22、rements.a) Constant absolute humidity: It is generally observed that temperature and relative humidity change under a constant absolute humidity in outdoor environments. The water absorption of deposited salts is an important factor affecting atmospheric corrosion behaviour. The same relationship, c
23、onstant absolute humidity, as an actual environment is intended/expected to exist for temperature and relative humidity during dry/wet cycles.b) Control of the amount of salt deposition: The amount of the salt deposition on test specimens is intended/expected to be changed according to the corrosivi
24、ty of the atmosphere in which the tested metallic material can be used. A salt-containing test solution is intended/expected to be diluted or the spraying time is intended/expected to be adjusted to provide the same yearly average amount of the salt deposition as an actual environment.Therefore, the
25、 tests described in this International Standard involve the salt deposition and cyclic dry/wet conditions under a constant absolute humidity.The results obtained do not permit far-reaching conclusions on the corrosion resistance of the tested metallic material under the whole range of environmental
26、conditions in which it can be used. Nevertheless, the tests provide valuable information on the relative performance of materials exposed to salt-contaminated environments similar to those used in the tests.The International Organization for Standardization (ISO) draws attention to the fact that it
27、is claimed that compliance with this International Standard can involve the use of a patent concerning the tests given in Clause 8, Table 3, and Figure 2.ISO takes no position concerning the evidence, validity, and scope of this patent right.The holder of this patent right has ensured the ISO that h
28、e/she is willing to negotiate licences under reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this respect, the statement of the holder of this patent right is registered with ISO. Information can be obtained from:JFE Steel Corporation2-2-3, Uchisaiwaic
29、ho, Chiyoda-ku, Tokyo 100-0011, JAPANAttention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. ISO shall not be held responsible for identifying any or all such patent rights. ISO 2013 All rights reserved v
30、BS ISO 16539:2013BS ISO 16539:2013Corrosion of metals and alloys Accelerated cyclic corrosion tests with exposure to synthetic ocean water salt-deposition process “Dry” and “wet” conditions at constant absolute humidity1 ScopeThis International Standard specifies two accelerated corrosion test proce
31、dures, Methods A and B, for the evaluation of corrosion behaviour of surface-treated metals and their alloys with and without paint on them in atmospheric environments. It also specifies the apparatus used. The two tests involve salt deposition and dry/wet conditions at a constant absolute humidity.
32、Method A applies to:metals and their alloys (including corrosion-resistance alloys)Method B applies to:metals and their alloysmetals and their alloys with coatings including metallic coatings (anodic or cathodic), organic coatings, and conversion coatings2 Normative referencesThe following documents
33、, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 4628-1, Paints and varnishe
34、s 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 systemISO 4628-2, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects
35、, and of intensity of uniform changes in appearance Part 2: Assessment of degree of blisteringISO 4628-3, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 3: Assessment of degree of rustingI
36、SO 4628-4, 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 crackingISO 4628-5, Paints and varnishes Evaluation of degradation of coatings Designation of quantity
37、and size of defects, and of intensity of uniform changes in appearance Part 5: Assessment of degree of flakingISO 8407, Corrosion of metals and alloys Removal of corrosion products from corrosion test specimensISO 8993, Anodizing of aluminium and its alloys Rating system for the evaluation of pittin
38、g corrosion Chart methodISO 9227, Corrosion tests in artificial atmospheres Salt spray testsISO 10289, Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates Rating of test specimens and manufactured articles subjected to corrosion testsINTERNATIONAL STANDARD I
39、SO 16539:2013(E) ISO 2013 All rights reserved 1BS ISO 16539:2013ISO 16539:2013(E)ISO 11130, Corrosion of metals and alloys Alternate immersion test in salt solutionISO 14993, Corrosion of metals and alloys Accelerated testing involving cyclic exposure to salt mist, “dry” and “wet” conditionsISO 1787
40、2, Paints and varnishes Guidelines for the introduction of scribe marks through coatings on metallic panels for corrosion testing3 Test solution3.1 Preparation of the mixed salt solutionThe mass of reagents shown in Table 1 shall be dissolved in distilled water or deionized water, with a conductivit
41、y of not higher than 20 S /cm at 25 C 2 C, to produce a mixed salt solution with a concentration of 36,0 g/l 3,6 g/l.The composition of the mixed salt solution is the same as typical synthetic ocean water shown in ISO 11130:2010, A.3 (test solution for simulating the corrosive effects of ocean water
42、).Table 1 Reagents and their concentrations of a mixed salt solutionReagents Concentration (g/l)NaCl 24,53MgCl25,20Na2SO44,09CaCl21,16KCl 0,695NaHCO30,201KBr 0,101H3BO30,027SrCl20,025NaF 0,003WARNING Handling of SrCl2and NaF can be hazardous and shall be restricted to use by skilled chemists or cond
43、ucted under their control.3.2 pH adjustmentTo adjust the pH of the solution, 5,0 g 0,5 g of NaOH shall be dissolved in water and diluted to total volume of 1 L to make 0,125 mol/l NaOH solution. It shall be added to the mixed salt solution to adjust the pH to 8,2 0,1 at 25 C 2 C.3.3 Preparation of t
44、he test solutionThe test solution shall be used as the mixed salt solution or shall be diluted by 1:10 and 1:100 to the mixed salt solution with a concentration of 36,0 g/l 3,6 g/l, 3,60 g/l 0,36 g/l, and 0,360 g/l 0,036 g/l. When not specified, the concentration shall be agreed by the interested pa
45、rties.2 ISO 2013 All rights reservedBS ISO 16539:2013ISO 16539:2013(E)4 Apparatus4.1 Component protectionAll components in contact with the test solution shall be made of, or lined with, materials resistant to corrosion by the test solution and which do not influence the corrosivity of the atomized
46、test solution. The apparatus shall include the components described in the following.4.2 Exposure cabinetIt is essential that temperature and humidity in exposure cabinet are controlled constantly.4.3 Salt deposition deviceThe atomizer shall be made of corrosion resistant materials, e.g. glass, plas
47、tic, or titanium. The atomized test solution shall be deposited homogeneously on specimens. The amount of deposited test solution shall be controlled. The diameter of the atomized test solution should be equal to or less than 100 m.The amount of deposited test solution can be controlled in the follo
48、wing manners:a) by controlling the test period with a continuous atomization;b) by controlling the amount of test solution, the atomized pressure, and the moving speed of the atomizer.The compressed air supplied to the atomizer shall be passed through a filter to remove all trace of oil or solid mat
49、ter.4.4 Temperature and humidity control deviceThe device shall be capable of detecting and controlling the temperature and humidity around specimens. In the transition period of temperature and humidity, the device shall be capable of controlling the dry bulb temperature linear to target value and test period. The device shall be capable of controlling the humidity by keeping the absolute humidity constant to dry bulb temperature at least in every minute.4.5 R
