ISO 8044-2020 pdf free.Corrosion of metals and alloys 一 Vocabulary.
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:JJwww.iso.orglobp
— 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 ito entry: This interaction Is often of an electrochemical nature.
3.2 corrosive agent substance that will initiate or promote corrosion (ii) when in contact with a given metal.
3.3 corrosive environment environment that contains one or more corrosive agents (32)
4-44 stress-oriented hydrogen-induced cracking SOil IC staggered small cracks formed approximately perpendicular to the principal stress (residual or applied) resulting in a 9adder-like” crack array linking (sometimes small) pre-existing HIC (439) cracks.
Note ito entry: The mode of cracking can be categorised as sulfide stress corrosion cracking (SSCtJ (4,43) caused by a combination of external stress and the local strain around hydrogen-induced cracks. SOH IC is related to SSCC and HIC/stepwise cracking (SW1 (4.4_2). It has been observed in parent material of longitudinally welded pipe and in the heat-affected zone (HAZ) of welds in pressure vessels. SOTIIC is a relatively uncommon phenomenon usually associated with low-strength ferritic pipe and pressure vessel steels.
Note 2 to entry: Compare s’ith hydrogen embrittlement (432)-ISOURCE: ISO 15156-1:2015, 3.22, modified — In Note 1 to entry, SSC’ has been replaced with SSCC’. Note 2 to entry has been added.
4-45 exfoliation corrosion stratified form of subsurface stress corrosion (430) of susceptible primary wrought alloy mill products having a highly directional grain structure, accompanied by detachment of separate layers from the body of the material, formation of cracks and finally usually complete layer-by-layer disintegration of metal.
Note I to entry: Exfoliation generally proceeds along grain boundaries, but with certain alloys and tempering it may develop along transgranular paths or a mixed intergranular/transgranular path.
Note 2 to entry: Layer corrosion can be developed on the first stage.
4.46 filiform corrosion type ol corrosion (11) proceeding under coating materials on metals in the form of threads, generally starting from bare edges or from local damage to the coating.
Note ito entry: Usually the threads are irregular in length and direction of growth, hut they may also be nearly parallel and of approximately equal length. It should he noted that filiform corrosion can occur under different prvtective coatings (5.S).
4.47 tribo-corrosion any form of corrosion (11) that involves constant removal of the passivation layer (2.3J) due to fluid or particle impact on the corroding surface or the friction between the corroding surface and another surface.
Note Ito entry: Tribo-corrosion includes but is not restricted to: wear corrosion (428),fretting corrosion (4.21) and erosion corrosion (4.2S).ISO 8044 pdf download.
Tags: Corrosion of metals and alloys
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