Assessing the quality of corrosion protection coatings on aluminium — Part 1 Available to Purchase

Non‐destructive coating thickness measurements The Eddy Current Methods One of the methods suitable for measuring non‐destructively the thickness of electrically non‐conductive coatings on conductive and, in general, non‐magnetic substrates is the eddy current method. Examples are anodic oxide films on aluminium (DIN 17611, 17612, 50984, BS 1615 and ASTM B 244) and coatings of dry varnish, plastic, rubber and enamel on aluminium, brass, copper and austenitic steel. Low‐conductivity metallic coatings (e.g. Cr) on high‐conductivity substrates such as aluminium, copper or brass can also be measured with an instrument of modified design.