ASTM B504
ASTM B504 – Standard Test Method for Measurement of Thickness of Metallic Coatings by the Coulometric Method Description: Significance and Use 4.1 Measurement of the thickness of a coating is essential to assessing its utility and cost. 4.2 The coulometric method destroys the coating over a very small (about 0.1 cm2) test area. Therefore its use is …