Abstract:As an important port engineering structure,steel piles are more and more widely used in port engineering.However,due to the long-term exposure to complex marine (river) environment，steel piles in port engineering face serious chemical corrosion.The commonly used anti-corrosion measures for steel piles include:coating protection,metal thermal spraying protection,wrapped organic composite layer protection,sacrificial anode cathodic protection,impressed current cathodic protection and other methods.Among the many anti-corrosion measures,the sacrificial anode cathodic protection method is one of the most commonly used and effective method at home and abroad,which is commonly used in underwater area and mud area.In view of the problem that the strength of steel piles is reduced due to corrosion,which has an important impact on the structural safety of port engineering,the application of sacrificial anode cathodic protection technology in wharf engineering is studied.The protection effect of aluminum-zinc-indium anode is evaluated by combining theoretical analysis with on-site experience through means such as potential detection.The results show that when the protection potential is maintained at -1.05 - -0.85 V ( relative to the Cu/CuSO4?electrode ),the corrosion rate of the steel pile is reduced by about 90 %.The service life of the anode body of a single pile can reach about 30 years,and the sacrificial anode system can significantly prolong the service life of the steel pile structure of the wharf.
