BS ISO 22410:2020,Corrosion of metals and alloys – Electrochemical measurement of ion transfer resistance to characterize the protective rust layer on weathering steel.BS ISO 22410:2020 pdf free download.
Weathering steel containing Cu, Ni, P, etc, is widely used for bridges, buildings, towers and other structures because of its maintenance-free characteristics resulting From the formation of a protective and adhesive rust layer when exposed to the atmosphere.
This feature makes it possible for weathering steel to be used without any surface treatment. It requires, however, several years of exposure to form the protective rust on untreated surfaces. During this period, quite complicated reactions occur within the rust layer affected by local environmental factors.Therefore, there is a strong need for a quantitative and non-destructive monitoring method factors for the assessment of the protective rust layer condition on weathering steel structures.
BS ISO 22410:2020 specifies a method for the electrochemical measurement of ion transfer resistance of the rust layer formed on weathering steel alloys in order to assess their protective properties against.
corrosion thereafter.
This method uses an electrochemical AC impedance measurement,together with harmonic analysis, to identify the ion transfer resistance, and a rust thickness measurement to characterize the stability of the protective rust layer in terms of corrosion protection under used environments.
2 Normative references
ISO 2178, Non-magnetic coatings on magnetic substrates – Measurement of coating thickness Magnetic method;
ISO 9223, Corrosion of metals and alloys-Corrosivity of atmmospheres – Classification, determination and estimation;
Generally, weathering steel exhibits a good corrosion resistance after long-time exposure to the atmosphere, as shown in Figure 1. This is because it forms a protective rust adhered to the substrate steel. However, the formation of the protective rust layer depends on the atmospheric environment and the time elapsed. Sometimes, severe corrosion can occur because there is no protective rust layer, in particular when chloride ion hinders the formation of such rust.
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