This International Standard establishes a classification system for the corrosivity of atmospheric environments. It<\/p>\n
defines corrosivity categories for the atmospheric environments by the first-year corrosion rate of standard specimens,<\/p>\n<\/li>\n
gives dose-response functions for normative estimation of the corrosivity category based on the calculated first-year corrosion loss of standard metals, and<\/p>\n<\/li>\n
makes possible an informative estimation of the corrosivity category based on knowledge of the local environmental situation.<\/p>\n<\/li>\n<\/ul>\n
This International Standard specifies the key factors in the atmospheric corrosion of metals and alloys. These are the temperature-humidity complex, pollution by sulfur dioxide and airborne salinity.<\/p>\n
Temperature is also considered an important factor for corrosion in areas outside the temperate macroclimatic zone. The temperature-humidity complex can be evaluated in terms of time of wetness. Corrosion effects of other pollutants (ozone, nitrogen oxides, particulates) can influence the corrosivity and the evaluated one-year corrosion loss, but these factors are not considered decisive in the assessment of corrosivity according to this International Standard.<\/p>\n
This International Standard does not characterize the corrosivity of specific service atmospheres, e.g. atmospheres in chemical or metallurgical industries.<\/p>\n
The classified corrosivity categories and introduced pollution levels can be directly used for technical and economical analyses of corrosion damage and for a rational choice of corrosion protection measures.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 9<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 3 Terms and definitions 4 Symbols and abbreviated terms 4.1 Symbols <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 4.2 Abbreviated terms 5 Category of corrosivity of the atmosphere 6 Classification of corrosivity of the atmosphere <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 7 Corrosivity determination based on corrosion rate measurement of standard specimens 8 Corrosivity estimation based on environmental information 8.1 Corrosivity estimation\u00a0\u2014 General <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 8.2 Normative corrosivity estimation based on calculated first-year corrosion losses <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 8.3 Informative corrosivity estimation based on description of exposure conditions <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Corrosion of metals and alloys. Corrosivity of atmospheres. Classification, determination and estimation<\/b><\/p>\n |