What is ISO 10309 - Metallic coatings about?
ISO 10309 is an international standard on metallic coatings. Metallic coatings are a covering that is applied to the surface of an object, usually referred to as the substrate. ISO 10309 specifies a method of revealing pores of other discontinuities when testing metallic coatings that are not visibly affected by ferricyanide and chloride ions during the test period and that are cathodic to iron and steel. This method is especially useful for thick, hard chromium coatings used to wear resistance.
With some coating materials, a very thin layer is dissolved by the sodium chloride solution during a 10-minute application period. The impact of such dissolution is that potential porosity, i.e., pores that have been covered over by a very thin layer, are sometimes re-exposed. Experience has shown that such potential porosity is frequently re-exposed during actual service.
Who is the ISO 10309 - Metallic coatings for?
ISO 10309 on metallic coatings is useful for:
- Metallic coating manufacturers
- Metallic coating application sector
- Quality control personnel
Why should you use ISO 10309 - Metallic coatings?
The purpose of applying the coating may be decorative, functional, or both. ISO 10309 helps you to provide a test method of metallic coating for revealing pores or discontinuities. ISO 10309 provides a useful test method when thick and hard chromium coatings are used for wear resistance.
Base metal ions, formed in corrosion cells at the bottom of discontinuities in metallic coatings migrate to treated test paper held in contact with the coating surface. The base metal ions retained on the treated test paper form a blue coloured marking or spot when the treated paper is subsequently immersed in a solution of ferricyanide indicator solution. With compliance and obedience to ISO 10309, you can enhance the efficiency or efficacy of machinery and manufacture a standardized product of high-quality. And using ISO 10309 you can also specify a method of revealing pores of other discontinuities when testing metallic coatings that are not visibly affected by ferricyanide and chloride ions during the test period and that are cathodic to iron and steel.
