海水タンクの陰極防食試験 (第2報)

外部電源による電解被覆と高純度亞鉛陽極の併用

抄録

The inner surfaces of a steel tank containing seawater was electrocoated by the electricity from external source, under the condition of the current of 1 ampere and 50 ampere-hour respectively per square meter of protected area. The coated surfaces were then protected with high-purity zinc anodes for about 2000 hours. The coating obtained was found to be so excellent that the necessary current to maintain the protective potential was not more than 5-10mA per square meter of steel surface. The potential distribution of tank and anodic current of zinc were frequently measured. Through the test, the high-purity zinc anodes held the more negative potential than -1 volt referred to sat. calomel and even reached to the anode efficiency of 94%.