ISO 24020:2022

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
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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

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ISO/FDIS 24020:2021(E)
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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
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ISO/FDIS 24020:2021(E)
Foreword
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This document was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.
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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.
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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.
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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
...