素地調整条件と塗膜性能に関する一考察
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概要
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Surface preparation is believed to be fundamentally the most important factor that affects the efficiency of paint. In recent years the sand blast cleaning method has been increasingly adopted in the special marine coating system. The blast condition consists of three factors as follows. P_B : The pressure at gage in kilogram per sq. cm. (Discharging the abrasive in a stream of high pressure air.) V_B : The velocity of movement of blast cleaning nozzle in cm. per sec. N_B : The number of repeated blast cleaning when P_B and V_B are constant. Experiments have been performed in order to investigate the relation between the efficiency of zinc silicate paint for its anticorrosive function and the blast condition, and the following results have been obtained as pointing to the way to raise the efficiency of the paint for its anticorrosive purposes. (1) The relation between N_R per sq. cm. and the blast condition can be expressed by N_R/cm^2(TP-1)=116.3747+0.3466 V_B+P_B(3.6555 P_B-38.0895)-4.5806 N_B N_R/cm^2(TP-2)=23.0572+0.0927 V_B+P_B(0.8327 P_B-8.2335)-0.9123 N_B where N_R/cm^2 : the number of pinpoint rusting per sq. cm. TP-1 : the steel surface with millscale before the sand blast cleaning. TP-2 : the steel surface treated by shot blast and having zinc rich epoxy type shop primer applied to it before the sand blast cleaning. (2) The eff ect of P_B on the efficiency of the paint is estimated at 60~70 per cent. P_B is the condition of prime importance to promote the efficiency of zinc silicate paint for anticorrosive purposes. pressure of 6 kilogram per sq. cm. is required in this case. (3) V_B has but little to do with the efficiency of paint by itself. It is important, however, relative to the interaction of P_B and V_B. The following rate of velocity of transition of blast nozzle is required under P_B of 6 kilogram per sq. cm. V_B=10cm/sec for TP-1 V_B<40cm/sec for TP-2 (4) N_B has litte to do with the efficiency of the paint when P_B and V_B are constant. (5) When P_B, V_B and N_B are constant, high efficiency of zinc silicate paint is obtained by the use of TP-2 before the sand blast cleaning.
- 社団法人日本材料学会の論文
- 1968-08-15
著者
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