Corrosion is the degradation of metallic structures which can have a variety of causal factors and can displays itself in many different ways. Corrosion inspection procedure is to evaluate the remaining wall thickness or the presence of mid-wall anomalies in a pipe work, pressure vessels or any metallic structure.
Corrosion mapping is a quantitative way to inspect a material where oxidation or erosion has reduced its thickness. Since an ultrasonic path is directly reduced on a corroded part, a conventional UT beam can report one specific thickness at a time.
Corrosion mapping consists of scanning the surface of the test piece with or without Grid and measuring the remaining material thickness for each position. It can be done using a conventional ultrasonic testing (UT) probe.