Research status for corrosion mechanism and corrosion resistance regulation of low alloy threaded steel
Corrosion of threaded steel is a common problem in reinforced concrete structures,which seriously affects the safety and service life of the structure.With the continuous development of engineering construction,the de-mand for high-performance reinforced concrete with excellent durability is becoming more and more urgent.The service life of steel bar in concrete is determined by the transmission speed of corrosive medium in concrete and the corrosion resistance of steel bar itself.A large number of corrosive particles in the service environment accelerate the corrosion of steel bars,which is the most important factor leading to the damage of steel bar structures.Starting from the steel bar itself,optimizing the composition,microstructure and microstructure characteristics of the steel bar matrix to improve the corrosion resistance during each stage of steel bar corrosion is the effective method to solve the problem of steel bar corrosion fundamentally.Adding alloying elements to ordinary steel bars can be used as a low-cost,simple-to-operate anti-corrosion technology,a series of corrosion-resistant steel and a series of micro-allo-ying element control technology have been developed at home and abroad.The corrosion mechanism of threaded steel is summarized.The influence of environmental factors and alloying elements on the corrosion resistance of threaded steel and the protection methods of threaded steel are reviewed.Reasonable selection and application of alloying ele-ments can prolong the service life of reinforced concrete structures and ensure the durability and safety of structures.The research on the corrosion and protection mechanism of low alloy threaded steel is of great significance for the de-sign,construction and maintenance of concrete structures.
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