Abstract
The mechanochemical effect on the nature of zinc phosphate coatings formed on sand blasted mild steels was examined. From X-ray diffraction studies, the coatings were determined as hopeite. The weight of coating on the sandblasted steel was three times as large as that formed on the original, and small crystals were deposited on the sandblasted steel with large density. When the sandblasted steel was exposed to air for 2min-1440min, the number of crystals per unit area was decreased and the crystals were grown. This result suggests that the mechanochemical activity of the sandblasted surface was reduced on exposure to air. The emission intensity of exoelectron from the sandblasted steel was also decreased with exposure time. It is suggested from a fairly good coincidence of the surface density of crystal with the emission intensity of exoelectron that the exoelectron phenomena can be applied to an indirect determination of the mechanochemical activity of sandblasted steels.
