1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 27667:2011Road vehicles Brake liningfriction materials Evaluationof corrosion effects on paintedbacking plates and brake shoesBS ISO 27667:2011 BRITISH STANDARDNational fo
2、rewordThis British Standard is the UK implementation of ISO 27667:2011.The UK participation in its preparation was entrusted to TechnicalCommittee AUE/11, Braking systems.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purpor
3、t to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 74318 4ICS 43.040.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards
4、 Policy and Strategy Committee on 31 August 2011.Amendments issued since publicationDate Text affectedBS ISO 27667:2011Road vehicles Brake lining friction materials Evaluation of corrosion effects on painted backing plates and brake shoesVhicules routiers Matriaux de friction pour garnitures de frei
5、ns valuation des effets de la corrosion sur plateaux de freins peints et segments de freins peints ISO 2011Reference numberISO 27667:2011(E)First edition2011-07-15ISO27667INTERNATIONAL STANDARDBS ISO 27667:2011ISO 27667:2011(E)COPYRIGHT PROTECTED DOCUMENT ISO 2011All rights reserved. Unless otherwis
6、e specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright off
7、iceCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in Switzerlandii ISO 2011 All rights reservedBS ISO 27667:2011ForewordISO (the International Organization for Standardization) is a worldwide federation of national standard
8、s bodies (ISO member 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 organiz
9、ations, governmental 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 t
10、he ISO/IEC Directives, 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
11、the member bodies 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 27667 was prepared by Technical Committee ISO/TC 22, Road vehicle
12、s, Subcommittee SC 2, Braking systems and equipment.ISO 27667:2011(E) ISO 2011 All rights reserved iiiBS ISO 27667:2011IntroductionCorrosion issues and testing are varied and costly to assess, diagnose, and correct. This International Standard is used in conjunction with other standards which provid
13、e specific test methods, description of sample preparation and testing apparatus, evaluation criteria, and test reports. Emphasis is placed on the evaluation methods to ensure a definite set of international standards for reporting the different phenomena observed during and at the completion of tes
14、ting.This International Standard is intended for use in conjunction with other applicable standards or test procedures (ASTM, ISO, SAE, JASO, and other project or company-specific testing programs) to fully assess a friction materials adequacy for use in a certain application, market or vehicle plat
15、form. This International Standard does not include performance requirements related to durability, cosmetic appearance, or function under different vehicle conditions of temperature, mechanical stresses, environments, contamination, and operating conditions of the braking system as observed during a
16、ctual vehicle operation.Brake pads and brake shoes are key components in the vehicle braking system. Corrosion and its effects can generate warranty issues or costly repairs during the life-cycle of the vehicle. Since brakes are part of the under-body components, a detailed evaluation related to cor
17、rosion requires a comprehensive approach that provides a uniform set of laboratory test procedures and assessment criteria. Since corrosion-related phenomena are complex, this International Standard provides harmonization with other available international standards.Previous experience in similar ca
18、ses is a useful way to support the selection of a paint system for a specific application. The brake pad or shoe lining durability under corrosive environments depends heavily on factors such as working environment, system design, paint thickness and composition, surface preparation, application, dr
19、ying and handling. Of primary interest are the chemical and physical characteristics of the binder and the dry-film thickness. Artificial-aging tests are useful to evaluate these characteristics. These tests include: resistance to moisture; resistance to fog; resistance to chemicals.Exercise caution
20、 when analysing artificial-aging test results. Artificial exposure will not necessarily have the same effect as natural exposure. Not all factors occurring on the vehicle application are able to accelerate or replicate in the proper way. When feasible, plan and conduct natural-exposure or field-test
21、ing so that, in the long term, such abnormalities are resolved.Since there are no models widely accepted by the industry to predict in-service life based on laboratory corrosion testing, estimation of actual durability for a given application or environment is beyond the scope of this International
22、Standard.ISO 27667:2011(E)iv ISO 2011 All rights reservedBS ISO 27667:2011INTERNATIONAL STANDARD ISO 27667:2011(E)Road vehicles Brake lining friction materials Evaluation of corrosion effects on painted backing plates and brake shoes1 ScopeThis International Standard defines the methods for testing
23、and assessing the corrosion effects on painted backing plates used on disc brakes and painted brake shoes used on drum brakes.The methods and assessment criteria indicated in this International Standard are part of the specification/validation phases of the product and the series production monitori
24、ng from ISO 15484.The test procedures indicated include only laboratory performance testing, whether static or cyclic. Field surveys or proving grounds test protocols are beyond the scope of this International Standard.2 Normative referencesThe following referenced documents are indispensable for th
25、e 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.ISO 2409, Paints and varnishes Cross-cut testISO 2812-1, Paint and varnishes Determination of resistance to l
26、iquids Part 1: Immersion in liquids other than waterISO 4628-1, 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 systemISO 4628-2, Paints and varnishe
27、s Evaluation of degradation of coatings Designation of quantity and size of defects, 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
28、intensity of uniform changes in appearance Part 3: Assessment of degree of rustingISO 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 8044, Co
29、rrosion of metals and alloys Basic terms and definitionsISO 9227, Corrosion tests in artificial atmospheres Salt spray testsISO 15484:2008, Road vehicles Brake lining friction materials Product definition and quality assurance3 Terms and definitionsFor the purposes of this document, the terms and de
30、finitions given in ISO 8044, ISO 15484 and the following apply.3.1atmospheric corrosioncorrosion process that takes place in a film of moisture on the metal surfaceNOTE The moisture film may be invisible to the naked eye.3.2artificial agingaging above room temperature to accelerate or change a certa
31、in condition on a component ISO 2011 All rights reserved 1BS ISO 27667:20113.3chalkingdevelopment of loose removable powder at the surface of an organic coating, usually caused by weathering3.4corrosionphysicochemical interaction between a metal and its environment which results in changes in its pr
32、operties and which may lead to impairment or deterioration of the function or the system of which these form a part3.5corrosion acceleration factorratio of the corrosion rate during a given test to the corrosion rate in the actual field application or useNOTE The accurate calculation of this factor
33、requires detailed and extensive testing and field surveys.3.6corrosion ratecorrosion effect measured on a metal per unit of timeNOTE The type of corrosion rate used depends on the technical system and on the type of corrosion effect.3.7corrosion stressesenvironmental factors which promote corrosion3
34、.8corrosivityvisible or measurable ability of an environment to cause corrosion effects on a given corrosion system3.9crackingbreaks in a coating that extends through to the underlying surface3.10lot-rotcorrosion generated when a component is exposed to long periods of atmospheric corrosion3.11macro
35、-environmentweather conditions prevailing at a given location or area where the vehicle normally operatesNOTE The macro-environment is the combination of the climate and the corrosion stresses or atmosphere in the vehicle surrounding area, as established statistically by meteorological parameters re
36、corded over a prolonged period of time.3.12micro-environmentenvironment at the interface between the component and its surroundingsNOTE For this International Standard, the micro-environment is part of the vehicle underbody area near the brake corner.3.13control samplesample used to evaluate the act
37、ual performance of the test equipment and to validate the test techniqueNOTE Unless otherwise specified, two control samples of steel complying with ISO 1514 or ANSI-SAE equivalent of 150 mm 100 mm 0,7 1,25 mm in size.3.14reference samplepainted part, of known corrosion resistance performance on the
38、 actual or similar applicationNOTE Other brands or internal brake pads or brake shoes using other coating systems are suitable as reference samples. The reference sample should be as similar as possible in size and condition to the test sample.ISO 27667:2011(E)2 ISO 2011 All rights reservedBS ISO 27
39、667:20113.15time of wetnessperiod during which a film of electrolyte covers a metal surface and is capable of causing atmospheric corrosionNOTE Guidance values can be calculated from temperature and relative humidity by adding up the hours during which the relative humidity is above 80 % and, at the
40、 same time, the temperature is above 0 C. In brake systems application, the heat coming from the brake can bring the micro-environment temperature at the backing plate or brake shoe well above this temperature even during cold weather.4 Sampling4.1 Test samples, unless otherwise specified by the req
41、uestor, shall have been tested in accordance with ISO 15484:2008, 5.3.4.2 Control and reference samples, unless otherwise specified by the requestor, shall have been conducted in accordance with the applicable international standard used for the test.5 Test methods5.1 GeneralThe actual tests that sh
42、all be performed will depend upon the phase during the product life-cycle. This International Standard focuses on phases 5 and 6 (product specification/validation) of ISO 15484:2008. Product specification/validation requires a more thorough analysis of the different corrosion effects. Regular series
43、 monitoring requires a simple yet reliable test procedure to ensure the process conditions and the protective paint coating are both within the limits agreed upon during the previous phases. Table 1 defines the scope and applicability of the two test methods specified in 5.2 that are used to determi
44、ne the resistance of paints to corrosion, the results of which are evaluated and reported in accordance with the methods specified in 5.3.The test method shall be chosen in accordance with the working environment to which the material will be subjected.Prior to the start of testing, the following sh
45、all be defined, as agreed with the customer:a) test procedures to be conducted;b) sampling plan;c) duration for each test or number of cycles;d) expected failure modes; ande) assessment criteria.5.2 Corrosion test methodsFor the purposes of this International Standard, the test methods specified in
46、the following two international standards shall apply:a) the test methods specified in ISO 9227 shall be used to characterize the effectiveness of corrosion protection systems and to detect defects quickly when material is exposed to moisture or fog ambient;b) the test methods specified in ISO 2812-
47、1 shall be used to determine the resistance of paint when it is submitted to the action of chemical liquids, e.g. lubricating oil or brake fluid.Table 1 provides a simplified description of both test methods specified in this subclause.ISO 27667:2011(E) ISO 2011 All rights reserved 3BS ISO 27667:201
48、1Table 1 Test methods for laboratory corrosion evaluationInternational StandardScope and application Test cycle Typical durationISO 9227 Specifies apparatus, reagent and procedure for neutral salt spray-NSS-test and others.Assessment of corrosion resistance of metallic materials with and without coa
49、ting.Test results should not be regarded as a direct guide to the corrosion resistance in service.Gives means of checking comparative quality of a metallic material with or without coating.Cabinet temperature 35 C 2 C.Sodium chloride concentration 50 g/l 5 g/l and pH 6,5 to 7,2.Average rate of fog collection over 24 h of 1 ml/h to 2 ml/h over 80 cm2.2 h;6 h;24 h;48 h;96 h recommended for disc brake pads and drum brake shoes.ISO 2812-1 Determination of paint and varnish resistance to liquids
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