Weathering steel (WS) and high-performance steel (HPS) have been widely used in bridge engineering. Investigating the corrosion performances of WS and HPS is of great significance to the safety evaluation and maintenance of uncoated WS or HPS bridges, especially aging bridges. This study focused on the correlation between the corrosion performance and composition of the rust layer. Accelerated corrosion tests were conducted on Q345CNH and HPS 70 W to observe their corrosion performance under salt-spray corrosive environment. Based on the results of corrosion test and the existing corrosion attack evaluation theories, the empirical formulae of uniform corrosion and pitting corrosion were derived. X-ray diffraction experiments were performed to analyze the composition of the rust layer formed on the surface of steel specimens after various corrosion cycles. The relationship between the composition of the rust layer and the corrosion performance was established. The test corrosive environment was verified to be consistent with the C3 environment. The conclusions of this study could provide guidance for the corrosion evaluation in the following test or practical application.

中文翻译：

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耐候钢和高性能钢在模拟C3环境中的腐蚀性能及腐蚀产物成分研究

耐候钢（WS）和高性能钢（HPS）已广泛应用于桥梁工程。研究WS和HPS的腐蚀性能对于无涂层WS或HPS桥梁，特别是老化桥梁的安全评估和维护具有重要意义。本研究的重点是腐蚀性能与锈层成分之间的相关性。对Q345CNH和HPS 70 W进行加速腐蚀试验，观察其在盐雾腐蚀环境下的腐蚀性能。根据腐蚀试验结果和现有的腐蚀评价理论，推导了均匀腐蚀和点蚀的经验公式。通过X射线衍射实验来分析不同腐蚀周期后钢试样表面形成的锈层的成分。建立了锈层成分与腐蚀性能之间的关系。经验证测试腐蚀环境与C3环境一致。本研究的结论可为后续试验或实际应用中的腐蚀评价提供指导。