ISO 24020:2022
(Main)Corrosion of metals and alloys — Standard test method for particle-free erosion corrosion of metallic materials by jet-in-slit
Corrosion of metals and alloys — Standard test method for particle-free erosion corrosion of metallic materials by jet-in-slit
This document specifies a test method for particle-free erosion corrosion of metallic materials by use of jet-in-slit which is flow induced corrosion in single phase flowing liquids. The test method can be used for ranking materials performance, selecting candidate materials and testing the effects of corrosion inhibitors.
Corrosion des métaux et alliages — Méthode d'essai normalisée de corrosion-érosion en l'absence de particules par jet issu d'une fente
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INTERNATIONAL ISO
STANDARD 24020
First edition
2022-02
Corrosion of metals and alloys —
Standard test method for particle-
free erosion corrosion of metallic
materials by jet-in-slit
Corrosion des métaux et alliages — Méthode d'essai normalisée de
corrosion-érosion en l'absence de particules par jet issu d'une fente
Reference number
ISO 24020:2022(E)
© ISO 2022
---------------------- Page: 1 ----------------------
ISO 24020:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
© ISO 2022 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 24020:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principles . 1
4.1 Schematic of jet-in-slit test . 1
4.2 Hydrodynamic conditions on the specimen . 2
4.3 Typical damage pattern . 3
4.4 Material and solution . 3
5 Apparatus . 4
5.1 Nozzle and specimen . 4
5.2 Test chamber . 5
5.3 Test solution circuit . 6
6 Test conditions and procedure .7
7 Test report . 8
Annex A (informative) Recommended practice for copper alloys by jet-in-slit test .9
Bibliography .11
iii
© ISO 2022 – All rights reserved
---------------------- Page: 3 ----------------------
ISO 24020:2022(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
© ISO 2022 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 24020:2022(E)
Introduction
Particle-free erosion corrosion is a major problem in metallic materials of industries which handle
liquids flowing rapidly that are corrosive. Specifically, the metallic materials include copper, copper
alloys and steels, and the liquids are various types of liquids such as seawater, tap water, industrial
water, chemical water (e.g. acid and alkali aqueous solution), waste water, etc. Particle-free erosion
corrosion usually leads to rapid metal loss with possibly catastrophic consequences. In order to either
prevent, mitigate or control, or all, the problems, it is important to determine the particle-free erosion
corrosion behaviour of materials for plant construction. This can be achieved by standardizing the test
methods which can reproduce the specific mode of corrosion in those materials. This test method can
be applied to various types of metallic materials by choosing appropriate test solutions and conditions.
v
© ISO 2022 – All rights reserved
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 24020:2022(E)
Corrosion of metals and alloys — Standard test method for
particle-free erosion corrosion of metallic materials by jet-
in-slit
1 Scope
This document specifies a test method for particle-free erosion corrosion of metallic materials by use of
jet-in-slit which is flow induced corrosion in single phase flowing liquids. The test method can be used
for ranking materials performance, selecting candidate materials and testing the effects of corrosion
inhibitors.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 8044, Corrosion of metals and alloys — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8044 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
erosion
progressive loss of original material from a solid surface due to mechanical interaction between that
surface and a fluid, a multicomponent fluid, an impinging liquid or solid particles
Note 1 to entry: For more details, see Reference [1].
3.2
erosion corrosion
process involving conjoint corrosion and erosion (3.1)
3.3
particle-free erosion corrosion
erosion corrosion (3.2) of metallic materials in single phase flowing liquids free of solid particles and
gas bubbles
4 Principles
4.1 Schematic of jet-in-slit test
The schematic of jet-in-slit test can be seen in Figure 1. Two circular discs with the same dimensions are
set face-to-face to form a narrow gap (slit) between them. A bore hole is drilled-through at the centre
of the upper disc to make a nozzle. A jet of test solution from the nozzle impinges at a right angle to the
specimen and then to flow in a radial direction through the slit.
1
© ISO 2022 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 24020:2022(E)
Key
1 nozzle
2 specimen
a
Solution flow.
Figure 1 — Schematic of jet-in-slit test
4.2 Hydrodynamic conditions on the specimen
The hydrodynamic conditions of jet flow on the specimen surface in the nozzle and slit are shown in
[2]
Figures 2 a) and b) . The vertical flow velocity (see Figure 2, Key 7) is highest at the centre (see Figure 2,
Key 3) of the nozzle (see Figure 2, Key 2), or the specimen (see Figure 2, Key 1), but is reciprocally
the highest (reverse direction) at the location approximately 1,5 mm from the centre, in the jet flow
(see Figure 2, Key 5). The flow reb
...
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 24020
ISO/TC 156
Corrosion of metals and alloys —
Secretariat: SAC
Standard test method for particle-
Voting begins on:
2021-10-20 free erosion corrosion of metallic
materials by jet-in-slit
Voting terminates on:
2021-12-15
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 24020:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2021
---------------------- Page: 1 ----------------------
ISO/FDIS 24020:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
© ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 24020:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principles . 1
4.1 Schematic of jet-in-slit test . 1
4.2 Hydrodynamic conditions on the specimen . 2
4.3 Typical damage pattern . 3
4.4 Material and solution . 3
5 Apparatus . 4
5.1 Nozzle and specimen . 4
5.2 Test chamber . 5
5.3 Test solution circuit . 6
6 Test conditions and procedure .7
7 Test report . 8
Annex A (informative) Recommended practice for copper alloys by jet-in-slit test .9
Bibliography .11
iii
© ISO 2021 – All rights reserved
---------------------- Page: 3 ----------------------
ISO/FDIS 24020:2021(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
© ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/FDIS 24020:2021(E)
Introduction
Particle-free erosion corrosion is a major problem in metallic materials of industries handling liquids
flowing rapidly which are corrosive. Specifically, the metallic materials include copper, copper alloys
and steels, and the liquids are various types of liquids such as seawater, tap water, industrial water,
chemical water (e.g. acid and alkali aqueous solution), waste water. Particle-free erosion corrosion
usually leads to rapid metal loss with possibly catastrophic consequences. In order to prevent, either
mitigate or control, or both, the problems, it is important to determine the particle-free erosion
corrosion behaviour of materials for plant construction. This can be achieved by standardization of
the test methods which can reproduce the specific mode of corrosion in those materials. This test
method can be applied to various types of metallic materials by choosing appropriate test solutions and
conditions.
v
© ISO 2021 – All rights reserved
---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 24020:2021(E)
Corrosion of metals and alloys — Standard test method for
particle-free erosion corrosion of metallic materials by jet-
in-slit
1 Scope
This document specifies a test method for particle-free erosion corrosion of metallic materials by use of
jet-in-slit which is flow induced corrosion in single phase flowing liquids. The test method can be used
for ranking materials performance, selecting candidate materials and testing the effects of corrosion
inhibitors.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 8044, Corrosion of metals and alloys — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8044 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
erosion
progressive loss of original material from a solid surface due to mechanical interaction between that
surface and a fluid, a multicomponent fluid, or an impinging liquid or solid particles
Note 1 to entry: For more details, see Reference [1].
3.2
erosion corrosion
process involving conjoint corrosion and erosion (3.1)
3.3
particle-free erosion corrosion
erosion corrosion (3.2) of metallic materials in single phase flowing liquids free of solid particles and
gas bubbles
4 Principles
4.1 Schematic of jet-in-slit test
The schematic of jet-in-slit test can be seen in Figure 1. Two circular discs with the same dimensions are
set face-to-face to form a narrow gap (slit) between them. A bore hole is drilled-through at the centre
of the upper disc to make a nozzle. A jet of test solution from the nozzle impinges at a right angle to the
specimen and then to flow in radial direction through the slit.
1
© ISO 2021 – All rights reserved
---------------------- Page: 6 ----------------------
ISO/FDIS 24020:2021(E)
Key
1 nozzle
2 specimen
a
Solution flow.
Figure 1 — Schematic of jet-in-slit test
4.2 Hydrodynamic conditions on the specimen
Th
...
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