The main steps of the coloring flaw detection method include:
Clean the surface: First, make sure that the surface of the object to be detected is clean and free of grease, dirt and other substances. Surfaces can be cleaned using methods such as hot water or detergent, and make sure the surface is completely dry before testing.
Apply colorant: Apply the colorant evenly on the surface of the object to be inspected, and do not let the colorant be too thick or form a pool.
Wait for penetration: Allow the colorant to fully penetrate into the material, usually 10-30 minutes.
Wipe clean: Use an absorber or absorbent paper to wipe away the colorant remaining on the surface until the surface is clean.
Spray adsorption powder: Use fine powder to cover the surface to be inspected. The adsorption powder can absorb colorants and penetrate into defects to form visible color reactions.
Observe defects: observe the change in color of the adsorbed powder and detect the specific location and size of defects. Equipment such as a microscope can be used for fine observation.
These steps combine the coloring flaw detection method in non-destructive testing technology, which uses capillary phenomena to penetrate the penetrant into the defects, and uses the capillary action of the imaging agent to absorb the remaining penetrant in the defects, thereby achieving the purpose of inspecting defects.