FprEN ISO 8044

SLOVENSKI STANDARD
oSIST prEN ISO 8044:2023
01-november-2023
Korozija kovin in zlitin - Slovar (ISO/DIS 8044:2023)
Corrosion of metals and alloys - Vocabulary (ISO/DIS 8044:2023)
Korrosion von Metallen und Legierungen - Grundbegriffe (ISO/DIS 8044:2023)
Corrosion des métaux et alliages - Vocabulaire (ISO/DIS 8044:2023)
Ta slovenski standard je istoveten z: prEN ISO 8044
ICS:
01.040.77 Metalurgija (Slovarji) Metallurgy (Vocabularies)
77.060 Korozija kovin Corrosion of metals
oSIST prEN ISO 8044:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 8044:2023
oSIST prEN ISO 8044:2023
DRAFT INTERNATIONAL STANDARD
ISO/DIS 8044
ISO/TC 156 Secretariat: SAC
Voting begins on: Voting terminates on:
2023-08-28 2023-11-20
Corrosion of metals and alloys — Vocabulary
Corrosion des métaux et alliages — Vocabulaire
ICS: 01.040.77; 77.060
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ISO/DIS 8044:2023(E)
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oSIST prEN ISO 8044:2023
ISO/DIS 8044:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 8044
ISO/TC 156 Secretariat: SAC
Voting begins on: Voting terminates on:

Corrosion of metals and alloys — Vocabulary
Corrosion des métaux et alliages — Vocabulaire
ICS: 01.040.77; 77.060
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
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NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 8044:2023(E)
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ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

oSIST prEN ISO 8044:2023
ISO/DIS 8044:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms related to corrosion in general . 1
4 Terms related to types of corrosion .4
5 Terms related to corrosion protection . 9
6 Terms related to corrosion testing .11
7 Terms related to electrochemical matters .12
7.1 The electrochemical cell . 12
7.2 Reaction rates . 16
7.3 Passivation . 18
7.4 Electrochemical protection . . 19
7.5 Electrochemical corrosion tests . 20
Annex A (informative) Graphical representations of certain terms .22
Bibliography .24
Index .25
iii
oSIST prEN ISO 8044:2023
ISO/DIS 8044:2023(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.
This fifth edition cancels and replaces the fifth edition (ISO 8044:2020). Only three definitions have
been changed in this edition, but because one of them is the definition of corrosion, TC 156 determined
that a new revision was justified.
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
oSIST prEN ISO 8044:2023
ISO/DIS 8044:2023(E)
Introduction
The definitions in this document have been drawn up with the objective of achieving a proper balance
between precision and simplicity. The main objective of this document is to provide definitions that
can be understood to have the same meaning by all concerned. Some corrosion terms in present use
have developed through common usage and are not always logical. It has not, therefore, been possible
to define certain terms in the form they are used in some countries. Because of the occasional conflicts
between tradition and logic, some definitions inevitably represent a compromise.
An example of this kind of conflict is the term “corrosion”. This has been used to mean the process,
results of the process and damage caused by the process. In this document, corrosion is understood
to mean the process. Any detectable result of corrosion in any part of a corrosion system is termed
“corrosion effect”. The term “corrosion damage” covers any impairment of the function of the technical
system of which the metal and the environment form a part. Consequently, the term “corrosion
protection” implies that the important thing is to avoid corrosion damage rather than to prevent
corrosion, which in many cases is impossible and sometimes not necessary.
v
oSIST prEN ISO 8044:2023
oSIST prEN ISO 8044:2023
DRAFT INTERNATIONAL STANDARD ISO/DIS 8044:2023(E)
Corrosion of metals and alloys — Vocabulary
1 Scope
This document defines terms relating to corrosion that are widely used in modern science and
technology. In addition, some definitions are supplemented with short explanations.
NOTE 1 Throughout the document, IUPAC rules for electrode potential signs are applied. The term “metal” is
also used to include alloys and other metallic materials.
NOTE 2 Terms and definitions related to the inorganic surface treatment of metals are given in ISO 2080.
2 Normative references
There are no normative references in this document.
3 Terms related to corrosion in general
ISO and IEC maintain terminological 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
corrosion
Chemical or electrochemical interaction between a material, usually a metal, and its environment
Note 1 to entry: This may lead to deterioration of material properties, the environment, or the function of the
system containing that material.
3.2
corrosive agent
substance that will initiate or promote corrosion (3.1) when in contact with a given metal
3.3
corrosive environment
environment that contains one or more corrosive agents (3.2)
3.4
corrosion system
system consisting of one or more metals and those parts of the environment that influence corrosion
(3.1)
Note 1 to entry: Parts of the environment may be, for example, coatings, surface layers or additional electrodes
(7.1.2).
3.5
corrosion effect
change in any part of the corrosion system (3.4) caused by corrosion (3.1)
3.6
corrosion damage
corrosion effect (3.5) that causes impairment of the function of the metal, the environment or the
technical system, of which these form a part
oSIST prEN ISO 8044:2023
ISO/DIS 8044:2023(E)
3.7
corrosion failure
corrosion damage (3.6) characterized by the total loss of function of the technical system
3.8
corrosion product
substance formed as a result of corrosion (3.1)
3.9
scale
solid layer of corrosion products (3.8) formed on a metal at high temperature
Note 1 to entry: The term “scale” is also used in some countries for deposits from supersaturated water.
3.10
rust
visible corrosion products (3.8) consisting mainly of hydrated iron oxides
3.11
corrosion depth
distance between a point on the surface of a metal affected by corrosion (3.1) and the original surface
of the metal
3.12
corrosion rate
corrosion effect (3.5) on a metal per unit time
Note 1 to entry: The unit used to express the corrosion rate depends on the technical system and on the type of
corrosion effect. Thus, corrosion rate is typically expressed as an increase in corrosion depth (3.11) per unit time,
or the mass of metal turned into corrosion products (3.8) per area of surface and per unit time, etc. The corrosion
effect may vary with time and may not be the same at all points of the corroding surface. Therefore, reports
of corrosion rates are typically accompanied by information on the type, time dependency and location of the
corrosion effect.
3.13
corrosion resistance
ability of a metal to maintain serviceability (3.16) in a given corrosion system (3.4)
3.14
corrosivity
ability of an environment to cause corrosion (3.1) of a metal in a given corrosion system (3.4)
3.15
corrosion likelihood
qualitative and/or quantitative expression of the expected corrosion effects (3.5) in a defined corrosion
syst
...