Road vehicles -- Brake lining friction materials -- Evaluation of corrosion effects on painted backing plates and brake shoes

ISO 27667:2011 defines the methods for testing 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 ISO 27667:2011 are part of the specification/validation phases of the product and the series production monitoring 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 ISO 27667:2011.

Véhicules routiers -- Matériaux de friction pour garnitures de freins -- Évaluation des effets de la corrosion sur plateaux de freins peints et segments de freins peints

General Information

Status
Published
Publication Date
17-Jul-2011
Current Stage
6060 - International Standard published
Start Date
22-Jun-2011
Completion Date
18-Jul-2011
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ISO 27667:2011 - Road vehicles -- Brake lining friction materials -- Evaluation of corrosion effects on painted backing plates and brake shoes
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INTERNATIONAL ISO
STANDARD 27667
First edition
2011-07-15
Road vehicles — Brake lining friction
materials — Evaluation of corrosion effects
on painted backing plates and brake shoes
Véhicules routiers — Matériaux de friction pour garnitures de freins —
Évaluation des effets de la corrosion sur plateaux de freins peints et
segments de freins peints
Reference number
ISO 27667:2011(E)
ISO 2011
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ISO 27667:2011(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2011

All rights reserved. Unless otherwise 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 ISO’s

member body in the country of the requester.
ISO copyright office
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Tel. + 41 22 749 01 11
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Published in Switzerland
ii © ISO 2011 – All rights reserved
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ISO 27667:2011(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards 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 organizations, 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 the 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 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 vehicles, Subcommittee SC 2, Braking

systems and equipment.
© ISO 2011 – All rights reserved iii
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ISO 27667:2011(E)
Introduction

Corrosion issues and testing are varied and costly to assess, diagnose, and correct. This International

Standard is used in conjunction with other standards which provide 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 testing.

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

material’s adequacy for use in a certain application, market or vehicle platform. 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 actual 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 corrosion 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 cases 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,

drying 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 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-testing 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 Standard.
iv © ISO 2011 – All rights reserved
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INTERNATIONAL STANDARD ISO 27667:2011(E)
Road vehicles — Brake lining friction materials — Evaluation of
corrosion effects on painted backing plates and brake shoes
1 Scope

This International Standard defines the methods for testing 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 monitoring 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 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.
ISO 2409, Paints and varnishes — Cross-cut test

ISO 2812-1, Paint and varnishes — Determination of resistance to liquids — Part 1: Immersion in liquids

other than water

ISO 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 system

ISO 4628-2, Paints and varnishes — 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 blistering

ISO 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 rusting

ISO 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 cracking

ISO 8044, Corrosion of metals and alloys — Basic terms and definitions
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests

ISO 15484:2008, Road vehicles — Brake lining friction materials — Product definition and quality assurance

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 8044, ISO 15484 and the following apply.

3.1
atmospheric corrosion
corrosion process that takes place in a film of moisture on the metal surface
NOTE The moisture film may be invisible to the naked eye.
3.2
artificial aging

aging above room temperature to accelerate or change a certain condition on a component

© ISO 2011 – All rights reserved 1
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ISO 27667:2011(E)
3.3
chalking
development of loose removable powder a
...

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