Method for non-destructive testing of surface defects such as cracks in metal parts.

摘要

PCT No. PCT/EP84/00362 Sec. 371 Date Jul. 25, 1985 Sec. 102(e) Date Jul. 25, 1985 PCT Filed Nov. 16, 1984 PCT Pub. No. WO85/02464 PCT Pub. Date Jun. 6, 1985.In a process for the non-destructive inspection of surface defects, initially a solution with one or more dyes substantially having no emission under UV-light are applied and excess solution is removed after the dye has penetrated the surface defects, the surface is then covered with a developer leaving behind an absorbent coating with a high-contrast in daylight and which exclusively has one or more optical brighteners in a proportion between 0.02 and 2.0% by weight. The coating absorbs the dye from the surface defects, which appear as black traces on the coating under UV-light.