1 Scope
This International Standard establishes a classification system for the corrosivity
of atmospheric environments. It
— defines corrosivity categories for the atmospheric environments by the first-year
corrosion rate of standard specimens,
— gives dose-response functions for normative estimation of the corrosivity category based on the calculated first-year
corrosion loss of standard metals, and
— makes possible an informative estimation of the corrosivity category based on knowledge
of the local environmental situation.
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.
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.
This International Standard does not ...
Open preview (PDF)Corrosion of metals and alloys. Corrosivity of atmospheres. Classification, determination and estimation