ISO 9813:2023

INTERNATIONAL ISO
STANDARD 9813
First edition
2023-10
Corrosion of metals and alloys —
Performance test method for
corrosion inhibitors used in chemical
cleaning of industry equipment
Corrosion des métaux et des alliages — Méthode d'essai de
performance pour les inhibiteurs de corrosion utilisés dans le
nettoyage chimique des équipements industriels
Reference number
© ISO 2023
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 2
4.1 Container used in the static test below 100 °C . 2
4.2 Container used in the static test above 100 °C . 2
4.3 Dynamic test device . 2
4.4 Specimen suspending device . 3
4.5 Constant temperature device . 3
4.6 Oven. 3
4.7 Analytical balance . 4
4.8 Vernier caliper . 4
4.9 Magnifier . 4
4.10 Colorimetric tube . 4
4.11 Pipette . 4
5 Reagents and materials . 4
5.1 Experimental water . 4
5.2 Acetone . 4
5.3 Ethanol . 4
5.4 Abrasive paper . 4
6 Test specimens . 4
7 Pretreatment of specimens . 4
8 Test condition .5
8.1 Ratio of solution volume to surface area of immersed metal . 5
8.2 Concentration of cleaning agent. 5
8.3 Concentration of corrosion inhibitor . 5
8.4 Temperature . 5
8.5 Test duration . 5
8.6 Other provisions . 5
9 Procedure .5
9.1 Static test . 5
9.2 Dynamic test . 6
9.3 Calculation of the corrosion rate . 7
9.4 Intergranular corrosion and stress corrosion . 7
9.5 Solubility and dispersion test . 7
9.6 Time effectiveness test. 8
10 Report . 8
Annex A (informative) Result of corrosion inhibitor test . 9
Bibliography .12
iii
Foreword
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iv
Introduction
Corrosion inhibitor can markedly decrease the corrosion rate during metals and alloys chemical
cleaning process, but there is no standard for detection the performance of industry equipment
chemical cleaning corrosion inhibitor. In the current environment, it is of great practical significance
to establish International Standards for the performance evaluation test method of corrosion inhibitor
used in industry equipment chemical cleaning process scientifically and perfectly. This document
provides a basis for performance detection of corrosion inhibitor used in industry equipment chemical
cleaning process and helps prevent potential hazards caused by chemical cleaning.
v
INTERNATIONAL STANDARD ISO 9813:2023(E)
Corrosion of metals and alloys — Performance test method
for corrosion inhibitors used in chemical cleaning of
industry equipment
1 Scope
This document specifies the performance evaluation test method for corrosion inhibitors used
in chemical cleaning of industry equipment. It includes instruments, reagents, preparation and
pretreatment of the specimen, test conditions, test methods, reports, etc. The performance evaluation
test method includes the static or the dynamic test.
This document is applicable to testing the performance of corrosion inhibitors used in chemical cleaning
of industry equipment.
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 3696, Water for analytical laboratory use — Specification and test methods
ISO 6353-2, Reagents for chemical analysis — Part 2: Specifications — First series
ISO 7539-1, Corrosion of metals and alloys — Stress corrosion testing — Part 1: General guidance on testing
procedures
ISO 7539-5, Corrosion of metals and alloys — Stress corrosion testing — Part 5: Preparation and use of
C-ring specimens
ISO 11463, Corrosion of metals and alloys — Guidelines for the evaluation of pitting corrosion
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
solubility and dispersion
ability that the corrosion inhibitor can form uniform and stable solution or form tiny particles
suspended in solution without precipitation in water or cleaning liquid
3.2
time effectiveness
chemical cleaning time within which the corrosion inhibitor can maintain a good corrosion resistance
performance in chemical cleaning liquid
4 Apparatus
4.1 Container used in the static test below 100 °C
The wide-mouth jar is chosen in the static test below 100 °C. The volume of the wide-mouth jar
should not be less than 500 ml. The plastic container should be used to evaluate corrosion inhibitor
in hydrofluoric acid medium. A matched reflux cooler shall be equipped to the wide-mouth jar or the
plastic container to prevent the solution from evaporation.
4.2 Container used in the static test above 100 °C
The autoclave is chosen in the static test above 100 °C. The volume of autoclave should not be less than
500 ml. The using temperature range of the autoclave is between 100 °C and 200 °
...