ISO 8044:2020 pdf download

ISO 8044:2020 pdf download.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 http:// www .electropedia .org/
3.1 corrosion
physicochemical interaction between a metallic material and its environment that results in changes in the properties of the metal, and that may lead to significant impairment of the function of the metal, the environment or the technical system, of which these form a part
Note 1 to entry: This interaction is often of an electrochemical nature.
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
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.