What is ISO 11997-1 - resistance to cyclic corrosion in paints about?
Coatings such as varnish and paint are used not just for aesthetic appeal, but also to protect substrates from exposure and corrosion. Coatings that remain intact can extend the life of products significantly. ISO 11997-1 guides you with tests to determine the resistance of paints to corrosion.
Coatings of paints, varnishes and similar materials are exposed to one of four cycles of wet and dry conditions specified in 11997-1, using specified salt solutions in a cabinet in order to simulate, in the laboratory, processes occurring in aggressive outdoor conditions, such as marine environments.
ISO 11997-1 specifies a method for the determination of the resistance of coatings to one of four defined cycles of Wet (salt fog)/dry/humid conditions using specified solutions.
Who is ISO 11997-1 - resistance to cyclic corrosion in paints for?
ISO 11997-1 on resistance to cyclic corrosion in paints is useful for:
- Manufacturers of paints and varnishes
- Product development teams/innovation teams
- Quality control teams
Why should you use ISO 11997-1 - resistance to cyclic corrosion in paints?
Usually, the correlation between such outdoor weathering and laboratory testing cannot be expected because of the large number of factors influencing the breakdown process. Correlation can only be expected if the effect on the coating of important parameters (e.g., the nature of the pollutant, the spectral distribution of the incident irradiance in the relevant photochemical region, the temperature of the specimen, the type and cycle of wetting and relative humidity) is known.
In contrast to outdoor weathering, laboratory testing in a cabinet is performed with a reduced number of variables which can be controlled, and therefore the effects are more reproducible.
The method described in ISO 11997-1 provides a means of checking that the quality of a paint or paint system is being maintained. Using ISO 11997-1 guidelines, you would be able to innovate paints that resist corrosion, so that your customers can avail high-quality paints to preserve substrates.
What’s changed since the last update?
BS EN ISO 11997-1:2017 supersedes BS EN ISO 119971:2006. BS EN ISO 11997-1:2017 includes some technical and editorial changes with respect to BS EN ISO 119971:2006. These include:
- The time for no drops of moisture are visible on the panels (see 6.4) has been changed
- A reference to ISO 4628-8 for assessment of the degree of delamination and corrosion around a scribe or other artificial defect has been added
- A reference to ISO 4620-10 for assessment of the degree of filiform corrosion has been added
- The supplementary test conditions previously in Annex A have been integrated with the test report
- The numbering and order of annexes has been changed
- The adjustment procedure for the pH of the salt solution in Annex A to Annex D has been implemented from ISO 9227
- The text has been harmonized with the latest edition of ISO 9227 where possible
