Research on the mechanism of delamination failure of anti-corrosion coatings for hydraulic steel structures

This research explores the peeling failure mechanism of polyurea anti-corrosion coatings for steel in hydraulic structures after being subjected to seawater impact and vessel collisions. Regarding the defects of the polyurea coating caused by external forces,this paper simulates the marine corrosion environment through the application of an external current and precisely measures the coating peeling process by using 2D digital image technology. Further,the relationship between the coating peeling area and time is analyzed,and the data is analyzed using polynomial and exponential fitting methods. It is discovered that the exponential fitting method can describe the coating peeling regularity more accurately. The research also encompasses the mechanical property analysis of the polyurea coating,exploring the tensile mechanical properties under different strain rates and other mechanical parameters such as elastic modulus,Poisson’s ratio,and moment of inertia,providing a theoretical foundation for coating design and application. Based on the existing theories,the article also constructs coating models,including the elastic beam theory model and the crack propagation model,to deeply explore the intrinsic mechanism of coating peeling and corrosion failure.