What is one application of the salt test defined in ISO 8502.6?

The application of the salt test defined in ISO 8502.6 specifically pertains to evaluating the cleanliness of surfaces before coating. This test involves the use of a salt solution to determine the level of soluble salts present on the surface. Soluble salts can adversely affect the adhesion and performance of coatings, making it essential to assess and ensure surface cleanliness prior to application. The test helps inspectors determine if further surface preparation, such as washing or abrasive cleaning, is needed to achieve optimal coating performance. By highlighting the presence of contaminants, the salt test plays a crucial role in ensuring that the substrate is adequately prepared and that the coating will adhere properly, leading to better durability and functionality of the applied coating.