Due to the lack of specific specifications and standards, the anticorrosion process of steel structures in China's inland river wharf is mainly based on the practice of the harbor wharf. The continuous erosion of the anticorrosive coating of hydraulic steel structures, coatings fell off in a large range and caused the exposed and rusty steel structures, which directly affects the normal use of hydraulic steel structures. The erosion of anticorrosive coating on steel structures surface was a relatively long process, and the field test is not easy to track and observe at any time. In order to obtain the corresponding test results in a short time, and to predict the long-term corrosion behavior and service life of materials and structures, a set of accelerated erosion test device for anticorrosive coating was developed. It can be used to study the erosion law of anticorrosive coatings under different erosion conditions in the environment of sand flow.
With the development of water transport, steel structures are more and more used in inland river port structures, deep water wharf substructures and shipborne components. According to statistics, the world's waste steel materials due to corrosion account for more than 1/5 of the annual output, and the direct economic losses caused by steel corrosion in developed countries account for 2% ~ 4% of GDP (Grundmeier, 2000; Hagen, 2019; Mahdavi, 2019). After corrosion, steel structure will not only wear out the material, but also affect the stress of the structure, thus reducing the safety of the structure, which may cause huge loss of life and property.
Due to the lack of specific codes and standards, the anticorrosion process of steel structures in mountainous rivers and other inland rivers in China mainly refers to the practices of seaport wharf and the relevant codes for coating protection of steel structures for anticorrosion, viscoelastic materials are used to protect steel structures (Chen, 2015). According to the field investigation, the dry season alternates with the wet season, and the steel structure coating in the water level fluctuation area is scoured by the sand flow and the sun's irradiation, resulting in partial overall peeling off. Different parts of the steel structure are exposed to rust, and the corrosion is increasingly aggravated, as shown in Fig.1. The main reason for this phenomenon is the serious erosion of anti-corrosion coating on steel structure by sand flow in inland river environment (Liu, 2018).
