低合金螺纹钢腐蚀机理与耐蚀性调控研究现状

Research status for corrosion mechanism and corrosion resistance regulation of low alloy threaded steel

螺纹钢的腐蚀是钢筋混凝土结构中常见的问题,严重影响结构的安全和使用寿命。随着工程建设不断发展,对具有优异耐久性的高性能钢筋混凝土的需求越来越迫切。混凝土中钢筋的服役寿命由其中侵蚀介质的传输速度和钢筋自身耐蚀性共同决定,服役环境中大量的腐蚀粒子加速钢筋锈蚀是导致钢筋结构被破坏的最主要因素。从钢筋自身入手,优化钢筋基体成分、组织和微结构特征以提高钢筋锈蚀各阶段的耐蚀性,是从根本上解决钢筋锈蚀问题的有效方法。在普通钢筋中添加合金元素是一种低成本、易操作的防腐技术,国内外已经开发出系列化的耐蚀钢和系列化的微合金元素调控技术。归纳了螺纹钢的腐蚀机理,综述了环境因素、合金元素等对螺纹钢耐蚀性的影响以及螺纹钢的防护手段。合理选择并应用合金元素可以延长螺纹钢混凝土结构的使用寿命,确保结构的耐久性和安全性。低合金螺纹钢腐蚀与防护机理的研究对混凝土结构的设计、建设和维护具有重要意义。

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 demand 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-alloying 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 elements 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 design,construction and maintenance of concrete structures.