The ISO 8502-5:1998 standard specifies a method for the measurement of chlorides on the surface of steel using the ion detection tube method, which is designed to evaluate the surface cleanliness of steel substrates before painting. This method is suitable for the detection of chlorides on steel surfaces before and after cleaning and between coatings. The standard provides a field-tested technique to ensure that steel surfaces during painting do not contain excess chlorides, thus improving coating adhesion and long-term durability. This part of the standard is essential to ensure the surface preparation mass of steel before painting, helping to reduce painting defects and extend coating life.
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