[article]
Titre : |
Types of corrosive environment - Part 4 |
Type de document : |
texte imprimé |
Auteurs : |
P. K. Kamani, Auteur |
Année de publication : |
2013 |
Article en page(s) : |
p. 80-85 |
Note générale : |
Bibliogr. |
Langues : |
Anglais (eng) |
Catégories : |
Corrosion
|
Index. décimale : |
667.9 Revêtements et enduits |
Résumé : |
THE discussion of corrosion is incomplete if a combination of material and environment is not taken together. The same material behaves differently in different environment i.e. the corrosivity of environment varies from hour to hour, place to place and season to season. On the other hand, the same environment behaves differently with different metals. In this part a discussion would be made on environment; the material would be discussed in latter part of the series.
The environment consists of the entire surrounding in contact with the material. The environment is rich in water and oxygen, which causes corrosion to less resistant metals. The presence of other contaminants, stimulate the corrosion activity even with the noble metals. The primary factors to describe the environment are: (a) physical state-gas, liquid, or solid; (b) chemical composition-constituents and concentrations; and (c) temperature. Other factors can be important in specific cases e.g. relative velocity of a solution (flow or agitation), mechanical loads on the material etc.
The nature and rate of atmospheric corrosion is more or less dependent on the composition and properties of the thin-film surface electrolyte. The temperature, time of wetness and the type of concentration of gaseous and particulate pollutants in the atmosphere largely affect the corrosion attack. Any atmospheric condition should be defined in terms of temperature, humidity and contaminants or its corrosivity quantified in relation to the materials of interest ( e.g. steel, zinc, aluminium, copper and their alloys ). |
Note de contenu : |
- INDUSTRIAL
- URBAN
- RURAL
- INDOOR : Internal factors - External factors - Macro and micro environment - Mechanism of atmospheric corrosion
- PARAMETERS AFFECTING RATE OF ATMOSPHERIC CORROSION : Key variables in atmospheric corrosion - Oxygen - Wetness duration - Contaminants - Sulphur dioxide - chlorides - Other atmospheric contaminants - Temperature
- Table 1 : Atmospheric contaminants |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19660 |
in PAINTINDIA > Vol. LXIII, N° 8 (08/2013) . - p. 80-85
[article]
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