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Coating thickness is one of the most important parameters influencing durability of a protective coating system. As a general rule-of-thumb, the thicker the coating, the greater the protection. But is there any upper limit to this general rule? This paper looks at durability figures of common protective coating systems for atmospheric and immersion exposure as a function of dry film thickness.
Coating thickness is one of the most important parameters influencing durability of a protective coating system. As a general rule-of-thumb, the thicker the coating, the greater the protection. But is there any upper limit to this general rule? This paper looks at durability figures of common protective coating systems for atmospheric and immersion exposure as a function of dry film thickness. The examples are from studies in North America as well as International and Australian standards. While these studies show there is increasing durability with thickness for low overall film thicknesses, there is strong evidence that this improvement flattens out at a total thickness of around 250 microns (10 mils) for atmospheric coating systems, and a somewhat greater thickness for coatings exposed to immersed conditions. The paper discusses some reasons why this behavior may arise. It also describes some practical hints for ensuring coverage of edges and corners when applying coatings at lower thicknesses.
This comic book features Inspector Protector and his super hero team, working to save the world from the corrosion Grubzz. A classroom supplement intended to inform young students about corrosion engineering. Comic Book format - 24 pages.
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Over recent years there have been interesting developments in the way marine coatings and linings are specified that have unwittingly resulted in a situation that can make it challenging to meet a paint specification as currently written.
Coating performance and longevity is highly dependent on the quality of substrate surface preparation. The effect of profile height, profile type (e.g., type of tool used to perform the prep, angularity of profile, etc.), extent of cleanliness, and amount of chloride contamination on coating performance were all studied to determine the correlation between these factors in an attempt to identify the primary factor in coating failure due to improper surface preparation.