| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sacrificial protection material high in anti-corrosive effect at a low cost, by dispersing a prescribed zinc powder in a base material of a synthetic resin. SOLUTION: In the anti-corrosive material, >=65% of zinc powder, >=25% of which has >=150μm particle diameter, per the whole is dispersed. The resistivity of a materail having electric conductivity obtained by the dispersed particle is shown by the sum of the internal resistance of the molecule and the contact resistance of a particle contact part. Since the internal resistance of a metal such as zinc is small, the sum of the contact resistance greatly affects the whole resistivity. Then, the sum of the contact resistance becomes small by decreasing the number of the zinc particle arranged in a fixed thick coating film by dispersing the zinc powder having relatively large particle diameter such that >=150μm in the same concentration compared to that by incorporating a zinc powder having smaller particle diameter in the same concentration. That is, anti-corrosive current is increased by making the whole resistivity sufficiently small and as a result, excellent sacrificial protection effect is attained. |
