BS EN ISO 11844-1 pdf free download

BS EN ISO 11844-1-2020 pdf free download.Corrosion of metals and alloys – Classification of low corrosivity of indoor atmospheres Part 1: Determination and estimation of indoor corrosivity.
This document establishes a classification of low corrosivity of indoor atmospheres.
It specifies the reference metals for which a corrosion attack after a defined exposure period is used for determining corrosivity categories of indoor atmospheres of low corrosivity.
It defines corrosivity categories of indoor atmospheres according to corrosion attack on standard specimens.
It indicates important parameters of indoor atmospheres that can serve as a basis for an estimation of indoor corrosivity.
The selection of a method for the determination of corrosion attack, description of standard specimens, exposure conditions and evaluation are given in ISO 11844‑2. The measurement of environmental parameters affecting indoor corrosivity is given in ISO 11844‑3.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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 climate
statistics of temperature, humidity, atmospheric pressure, wind, rainfall, and other meteorological elements in a given location over a long period of time
[SOURCE: EN 15759‑1:2011, 3.1]
3.2 atmosphere
mixture of gases, aerosols and particles that surrounds a given material, object or structure
3.3 indoor atmosphere
environment [combined effect of climate (3.1) and atmosphere (3.2)] inside a box, a room or a building
3.4 microclimate
climate (3.1) of a small area, specific rooms, part of building, etc., which may be different from that in the general region
3.5 temperature‑humidity complex
combined effect of temperature and relative humidity on the corrosivity of the atmosphere (3.10)
[SOURCE: ISO 9223:2012, 3.4]
3.6 time of wetness
period when a metallic surface is covered by adsorptive and/or liquid films of electrolyte to be capable of causing atmospheric corrosion
[SOURCE: ISO 9223:2012, 3.5]
3.7 atmospheric pollution
specific corrosion-active substances, gases or suspended particles in the air (both natural and the
result of human activity)
3.8 corrosion system
system consisting of one or more metals and those parts of the environment that influence corrosion
[SOURCE: ISO 8044:2020, 3.4, modified — Note 1 to entry has been deleted.]
3.9 corrosivity
ability of an environment to cause corrosion of a metal in a given corrosion system (3.8)
[SOURCE: ISO 8044:2020, 3.14]
3.10 corrosivity of atmosphere
ability of the atmosphere to cause corrosion in a given corrosion system (3.8)
EXAMPLE Atmospheric corrosion of a given metal or alloy.
[SOURCE: ISO 9223:2012, 3.1, modified — An example has been added.]
4 Symbols and abbreviated terms
IC indoor corrosivity
r corr corrosion rate derived from mass‑loss measurement after an exposure of one year
r mi rate of mass increase after an exposure of one year
5 Classification of corrosivity
5.1 General
The corrosivity of indoor atmospheres can be classified either by a determination of the corrosion attack
on standard specimens of selected standard metals as given in Clause 6 or, where this is not possible, by an estimation of corrosivity based on the knowledge of humidity, temperature and pollution conditions as described in Clause 7 and Annexes B, C and D.
Estimation of corrosivity as described in 7.2 and Annexes C and D can lead to wrong conclusions. Therefore, the determination of corrosivity by the measurement of the corrosion attack on standard specimens is strongly recommended.BS EN ISO 11844-1 pdf download.