海洋岩土环境钢管桩材料表面腐蚀加速模拟实验

SIMULATION TEST ON ACCELERATED SURFACE CORROSION OF STEEL PIPE PILE IN MARINE ENVIRONMENT

为研究海洋岩土环境中海上风电钢管桩的长期腐蚀规律,通过制作以质量浓度为5%的NaCl溶液为腐蚀介质的饱和砂土地基模型,开展埋置Q235钢片的通电加速腐蚀试验,分析表面腐蚀现象、电化学性能及腐蚀速率(质量损失速率)随时间的变化规律。另外,利用双目激光扫描获取腐蚀表面三维数据,通过克里金插值法对钢片腐蚀表面形貌进行三维重构。通过对腐蚀表面三维数据分析,研究海洋岩土腐蚀环境下Q235钢腐蚀缺陷的发展规律,发现不同腐蚀程度下钢片表面腐蚀深度均服从较显著的正态模型,腐蚀深度均值、标准差随腐蚀时间的发展较符合Weibull分布模型和S形Weibull分布模型。

The corrosion characteristics of steel pipe piles in Marine geotechnical environment are of great value to the safety evaluation and durability design of offshore projects such as offshore wind power.For the study of Marine geological environment in the long-term corrosion of steel pipe piles for offshore wind,by making saturated sandy soil foundation model in which NaCl solution with a mass concentration of 5%is used as the corrosion medium,the electricity-accelerated corrosion test of embedded Q235 steel sheet is carried out and the surface corrosion,electrochemical properties and corrosion rate with time are analyzed.In addition,3D data of corroded surface is obtained by binocular laser scanning and the morphology of corroded surface is reconstructed by Kriging interpolation.Based on the three-dimensional data analysis of the corroded surface,the development law of the corrosion defects of Q235 steel under the corrosive environment of Marine soil is studied.It is found that the corrosion depth of steel surface under different degrees of corrosion all followed a relatively significant normal model,and the mean and standard deviation of corrosion depth with the development of corrosion time are in accordance with Weibull distribution model and s-shaped Weibull distribution model.