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Cleanliness of a metal surface prior to coating is imperative; just ask the paint manufacturers. Whilst there are several measurement techniques available to determine the level of soluble salts on a substrate prior to coating, Bresle is still considered by many as the “gold standard”. This paper discusses all the techniques outlined in SSPC-Guide 15, what they are actually measuring, their advantages and dis-advantages, how measurement comparison - and Bresle equivalency in particular - can be achieved. This paper also examines whether these measurement results are actually what is required to maximize corrosion prevention by protective coatings.
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