Abstract
Relation between the exo-electron emission from the sand-blasted steel and the anti-corrosive property of paint films applied on its surface was studied.
An experimental device was constructed to sand-blast steel under exactly controlled condition, which gave steel reproducible emission characteristics. From blasted steel, three types of specimens were prepared, that is, as blasted, aged, and annealed, which showed the emission activity in this order. Using these specimens, the effect of exo-electron was studied on the anti-corrosive property of the paint film applied on their surfaces. The anti-corrosive property was estimated from the change of impedance and the number of blisters during the painted specimen was immersed in 3% sodium chloride solution.
The above examinations indicated that the higher exo-electron emission activity of steel gave the better anti-corrosive property. However, at the present stage of investigation, it seems difficult to show a direct evidence of the role of exo-electron.
