ISO 4623-1:2018 Paints and varnishes, Determination of resistance to filiform corrosion, Steel substrates
Introduction to ISO 4623-1:2018
Filiform corrosion is a type of corrosion that appears as threads beneath a layer of paint, varnish, or similar product. It usually begins at the margins or with localized damage to the coating. Specific temperature and relative humidity conditions, as well as the presence of acids, bases, or salts beneath the paint layer or at coating cracks, are known to cause filiform corrosion. These kinds of situations are frequently observed in industrial or maritime settings. There will always be some under-corrosion of the coating, beginning at the scribe mark. However, filiform corrosion is only thought to exist when the characteristic thread-like pattern is visible. MaTestLab is one of the best testing service providers, with the best network of testing laboratories in the USA to carry out ISO 4623-1:2018 tests for our clients.
A coated test panel has a specific inscription. The scribed mark is exposed to a small amount of sodium chloride, either by dipping the panel into a salt solution or by being exposed to salt fog.
Exposure of panel
After that, the panel is exposed to 40 °C and 80% relative humidity in a test cabinet. The interested parties agree on criteria in advance to evaluate the consequences of exposure; these criteria may be subjective.
ISO 4623-1:2018 Test Specimens
Specimen Detail
Coatings of paints and varnishes are used as specimens for ISO 4623-1:2018
Specimen Size
The ground steel test panels must have minimum dimensions of 150 mm × 75 mm × 0.3 mm.
ISO 4623-1:2018 Test Results
ISO 4623-1:2018 centers on identifying the materials’ ability to withstand filiform corrosion on steel substrates. The findings offer important new information about how well different coatings work to stop this particular kind of corrosion, which appears as filaments beneath the paint layer.
ISO 4623-1:2018 is related to tests, including ISO 1513 for preparing samples of paints for testing, ISO 1514 for preparing standard panels, and ISO 2808 for calculating the paint film thickness.
Divakar Shukla is an Electrical and Electronics Engineer specializing in the convergence of embedded systems architecture, industrial automation, and applied artificial intelligence. Know More
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