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Bridge is an important infrastructure in national economic construction. Reinforced concrete structure is widely used in bridge. Chloride ion from seawater is an important factor that causes premature corrosion failure of steel tubular pile structure of bridge. Taking economical and effective measures to prevent and control corrosion damage of bridge steel pipe pile structure is a research topic of common concern in all countries. Cathodic protection is an electrochemical anti-corrosion technology to prevent metal corrosion. Cathodic protection is a technology that can have an important impact on the corrosion process that causes the deterioration of bridge structures.
In developed countries, cathodic protection has been used in reinforced concrete structures of Bridges for more than 30 years, and sacrificial anode cathodic protection systems and a variety of forced current cathodic protection systems have been developed. In China, cathodic protection technology did not begin to be applied to the steel structure of some new Bridges until 2006, including Hangzhou Bay Bridge, Jintang Bridge and Hong Kong-Zhuhai-Macao Bridge.
