三、钢桩在平均潮位以下涂漆的经济性 实施阴极保护的钢桩在平均潮位以下要否涂料?该问题迄今未有结论。据介绍说,日本的经验是不涂漆,因为: (1)裸露的钢结构在海水中,尽管起初保护电流密度比涂漆的大五、六倍甚至更多。但是持续一段时间后(如两年),裸露的钢结构水下部分由于阴极产物(碳酸钙和 Third, the steel piles in the average tide under the economy of painting the implementation of cathodic protection of steel piles in the average tide level to paint? This problem has so far not concluded. According to the briefing, Japan’s experience is unpainted because: (1) The exposed steel structure is in seawater, although the protective current density is initially five or six times greater than that of painting. However, after a period of time (eg two years), the exposed steel structure of the underwater part due to the cathode products (calcium carbonate and