课题揭示了海洋平台用钢在多场耦合环境下的力学-电化学、摩擦损伤-电化学、微生物-电化学交互作用腐蚀机制，获得了复杂耦合环境下钢材合金成分设计对环境敏感性影响规律，以及微观组织结构对耐蚀性的影响规律；建立了新型海洋平台用钢深海腐蚀性能评价方法，阴极保护准则及涂料设计原理，为开发高耐蚀海洋平台用钢提供支撑。全面评价了海洋平台用钢的静强度、抗断性能、耐腐蚀性能、耐疲劳性能、冷热加工性能及焊接性，建立典型高强度、大规格海洋工程用钢检测与服役性能评价标准。数据类型为图像、数据表格等文件，数据量大约150条，共享方式为协议共享，延期2年公开。

The project reveals the mechanical-electrochemical, friction damage-electrochemical and microbial-electrochemical interaction corrosion mechanisms of steel for offshore platforms in a multi-field coupled environment, and obtains the law of the influence of steel alloy composition design on environmental sensitivity and the law of the influence of microstructure on corrosion resistance in a complex coupled environment. It also establishes a new evaluation method for deep-sea corrosion performance of steel for offshore platforms, cathodic protection guidelines and coating. The method of deep-sea corrosion performance evaluation, cathodic protection criterion and coating design of the new steel were established to provide support for the development of high corrosion resistance offshore platform. The static strength, fracture resistance, corrosion resistance, fatigue resistance, hot and cold processing performance and weldability of steel for offshore platforms are comprehensively evaluated, and the testing and service performance evaluation standards for typical high-strength and large-size offshore engineering steel are established. The data types are images, data tables and other files with a volume about 150 items. The data is shared by agreement, and will be public after two years.