海洋腐蚀环境下高强度钢材研究现状及发展趋势

Research Status and Development Trend of High Strength Steel in Marine Corrosive Environment

海洋环境具有湿度大、盐分高等特征,海工建、构筑物面临浪花飞溅侵蚀损伤影响,钢结构的耐久性能受到严峻挑战和考验,海洋腐蚀环境下高强度钢材的失效机理、结构体系可靠性评估及表面防护技术等方面受到了国内外学者的广泛关注。基于海洋区域划分、高强钢腐蚀成因及损伤机制、力学性能退化关系进行了梳理,结合前期在模拟海洋浪溅区高强钢母材及焊缝连接所取得的研究基础上,重点讨论了海洋环境下Cl^(-)浓度、温度及湿度对于高强钢力学性能的影响规律,介绍了腐蚀周期与力学性能变化关系,最后提出了未来研究的趋势及主要方向,以期为今后海洋环境下高强钢局部腐蚀行为的深入研究、新型连接节点性能优化及安全防护技术应用提供借鉴,同时为建立海洋环境下高强钢寿命预测及失效评估方法提供有力支撑。

The marine environment has the characteristics such as high humidity and high salinity.Offshore buildings and structures are affected by splash erosion and damage,and durability of steel structure is subject to severe challenges and tests.The failure mechanism of high strength steel in marine corrosive environment,the reliability assessment of structural system,and surface protection technology have received extensive attention from scholars in China and abroad.Based on the division of marine environment,the corrosion causes and damage mechanism of high strength steel,and the relationship between mechanical property degradation and corrosion,this paper discusses the influence of Cl^(-)concentration,temperature and humidity on the mechanical properties of high strength steel in marine environment,combined with the previous simulation research on high strength steel base metal and weld joint in ocean splash zone.The relationship between corrosion cycle and mechanical properties is introduced,and finally the trend and main directions of future research are proposed.It is expected to provide a reference for the in-depth study of localized corrosion behavior of high strength steel in marine environment,the performance optimization of new connection joints and the application of safety protection technology in the future.At the same time,it will provide a strong support for the establishment of life prediction and failure assessment method for high strength steel in marine environment.