上海地区沿海挡潮闸,其出海引河海水的盐度一般在0.5％～1％之间,铝合金牺牲阳极在这样的淡海水中用以保护钢闸门,通过在南汇、奉贤、川沙三县的推厂应用,取得了成功,闸门均达到了较佳的保护电位。实施这种保护方法的技术关键在于:根据现场钢结构闸门的实际情况,(海水盐度、闸门的涂料状况等)确定合理的设计参数,(确定保护电流密度、牺牲阳极块的发生电流等),以使整个钢闸门达到设计的保护电位,并使其电位分布均匀,取得经济有效的保护效果。这 The coastal tidal flats in Shanghai have a salinity of 0.5% ~ 1% of the seawater diverted from the sea. Aluminum alloy sacrificial anodes are used to protect the steel gates in such light seawater. Through the protection of steel gates in Nanhui, Fengxian and Chuansha Push the factory application, has achieved success, the gate have reached a better protection potential. The key to implementing this method of protection is to determine reasonable design parameters based on the actual conditions of the steel gate in the field, such as seawater salinity and gate coating conditions, etc. (to determine the protection current density and sacrifice the current generated by the anode block, etc.) , So that the steel gate to achieve the design of the protection potential and its potential distribution, access to cost-effective protection. This