Detection of Pitting Corrosion in Stainless Steel Using Double-Layer Activation

摘要

A double layer activation technique was used to monitor the progress of corrosion of a Type 347 stainless steel in aqueous solution. In nitric acid solution, uniform corrosion and pitting were separately identified on the 'top grain' and 'end-grain' surfaces respectively of specimens prepared from rolled place. 'Bottle-shaped' pitting also was detected in chloride solution. A second stage of the work demonstrated that pitting could be detected with thick metal between the active surface and the detector using high energy gamma ray emitting isotopes.