introduction
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ISO 11997-2-2013 Coatings and varnishes – Determination of cyclic corrosion resistance conditions – Part 2: wet (salt spray)/ dry/humidity /UV light

The committee responsible for this document is ISO/TC 35, Paints and Varnishes, Subcommittee SC 9, Common Test Methods for Paints and varnishes.

The second edition cancels and replaces the technically revised first edition (ISO 11997-2:2000). The main technological changes are:

a) Alternative test procedures are added as an information annex;

b) Supplementary test conditions (original Annex A) have been included in the test report.

ISO 11997 consists of the following parts, under the general heading Paints and varnishes – Determination of resistance to cyclic corrosion conditions:

– Part 1: Wet (salt spray)/Dry/humidity

– Part 2: Wet (salt spray)/Dry/humidity/UV

This part of ISO 11997 is equivalent to ASTM D 5894, Standard Practice for painted metal cycle salt spray/UV exposure (alternating exposure in fog/drying cabinets and UV/condensing cabinets).

ISO 11997-2-2013 Coatings and varnishes – Determination of cyclic corrosion resistance conditions – Part 2: wet (salt spray)/ dry/humidity /UV light

introduce
Paints, varnishes, and coatings of similar materials use specified salt solutions in cabinets under cyclic wet corrosion and UV exposure conditions in order to simulate in the laboratory the processes that occur under corrosive outdoor conditions. In general, since there are many factors that affect the breakdown process, a valid correlation between such outdoor aging and laboratory testing cannot be expected. Certain relationships can only be expected if important parameters such as the properties of contaminants, spectral distribution of incident irradiance in the relevant photochemical region, temperature of the specimen, wetting type and cycle, and relative humidity are known to affect the coating. Compared to outdoor weathering, the number of variables for laboratory testing in the cabinet is reduced and can be controlled, so the effect is more repeatable.

The method described may provide a way to check whether the quality of the paint or paint system is being maintained. The method is designed to provide a more realistic simulation of these factors than traditional tests of continuous exposure to a set of static corrosion conditions. The method has been found to be useful for comparing the cyclic salt spray tolerance of different coatings. It is useful to provide relevant ratings for a range of coated panels that show significant differences in cyclic salt spray/UV exposure resistance tested at the same time and within the same test cycle.

The cycle specified in this part of ISO 11997 has been found to be useful for air drying industrial maintenance coatings on steel; Other loops can be used as needed.

ISO 11997-2-2013 Coatings and varnishes – Determination of cyclic corrosion resistance conditions – Part 2: wet (salt spray)/ dry/humidity /UV light

1 Range
This part of ISO 11997 specifies a test method that uses a specified solution to determine the resistance of a coating to a specified cycle of wet (salt spray)/dry/humidity/UV conditions.

2 Normative references
All or part of the following documents are referred to normatively in this document and are required for their application. For dated references, only the cited version applies. For undated references, a new version of the reference (including any revisions) applies.

ISO 1513, Paints and varnishes – Examination and preparation of test samples

ISO 1514, Paints and varnishes – Standard panels for testing

ISO 2808, Paints and varnishes – Determination of film thickness

ISO 3270, Paints and varnishes and their raw materials – regulation and testing of temperature and humidity

ISO 3696, analytical laboratory water – Specifications and test methods

ISO 4628-1, Paints and varnishes – Assessment of degradation of coatings – number and size of defects and designation of intensity of uniform change in appearance – Part 1: General introduction and designation of systems

ISO 11997-2-2013 Coatings and varnishes – Determination of cyclic corrosion resistance conditions – Part 2: wet (salt spray)/ dry/humidity /UV light

ISO 4628-2, Paints and varnishes – Assessment of coating degradation – designation of number and size of defects, and intensity of uniform changes in appearance – Part 2: Assessment of degree of foaming

ISO 4628-3, Paints and varnishes – Assessment of degradation of coatings – number and size of defects and assignment of intensity of uniform change in appearance – Part 3: Assessment of degree of rust

ISO 4628-4, Paints and varnishes – Assessment of coating degradation – designation of number and size of defects, and intensity of uniform changes in appearance – Part 4: Assessment of degree of cracking

ISO 4628-5, Paints and varnishes – Assessment of degradation of coatings – Number and size of defects and designation of intensity of uniform change in appearance – Part 5: Assessment of degree of peeling

ISO 4628-6, Paints and varnishes – Assessment of coating degradation – Number and size of defects and assignment of intensity of uniform change in appearance – Part 6: Assessment of degree of chalking by tape method

ISO 4628-8, Paints and varnishes – Assessment of coating degradation – designation of number and size of defects, and intensity of uniform changes in appearance – Part 8: Assessment of delamination and degree of corrosion around lines or other artificial defects

ISO 4628-10, Paints and varnishes – Assessment of coating degradation – designation of number and size of defects, and intensity of uniform changes in appearance – Part 10: Assessment of degree of filamentous corrosion

ISO 11997-2-2013 Coatings and varnishes – Determination of cyclic corrosion resistance conditions – Part 2: wet (salt spray)/ dry/humidity /UV light

ISO 11997-1:2005, Paints and varnishes. Determination of cyclic corrosion resistance conditions. Part 1: Wet (salt spray)/Dry/wet

ISO 15528, Paints, varnishes and raw materials for paints and varnishes – Sampling

ISO 16474-3: -1, Paints and varnishes – Methods of exposure to laboratory light sources – Part 3: fluorescent ultraviolet lamps

ISO 17872, Paints and varnishes – Guidelines for the introduction of scribbling marks through coatings on metal panels for corrosion testing

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