Atmospheric corrosion degrades the mechanical properties of steel structures mainly because of stress concentrations caused by an uneven corrosion topography. Electrolytic corrosion is regarded as one of the most efficient indoor accelerated corrosion approaches, while, the uneven atmospheric corrosion topography usually cannot be well simulated by electrolytic corrosion. This study aims to introduce an electrolytic corrosion solution suitable for simulating atmospheric corrosion. The surface morphologies of the structural steel specimens after electrolytic corrosion in three different solutions under various electrification time and magnitude of the current were compared. The surface characteristics of the corroded steel plates were measured by a 3D noncontact surface topography scanner, and analyzed based on surface roughness theory and fractal theory. The results showed that the mixed solution of 0.5% CH3COONa and 0.2% NaCl will produce pitting corrosion on the steel surface, and the surface morphologies of the steel specimens after electrolytic corrosion were consistent with that of neutral salt spray accelerated corrosion test. It is verified that the electrolytic accelerated corrosion in such a solution can simulate actual atmospheric corrosion reasonably.

中文翻译：

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基于改进方案的结构钢电解加速腐蚀形貌

大气腐蚀降低钢结构的力学性能主要是由于不均匀腐蚀形貌引起的应力集中。电解腐蚀被认为是最有效的室内加速腐蚀方法之一，而不均匀的大气腐蚀形貌通常不能很好地用电解腐蚀来模拟。本研究旨在介绍一种适用于模拟大气腐蚀的电解腐蚀溶液。比较了结构钢试样在不同通电时间和电流大小下在三种不同溶液中电解腐蚀后的表面形貌。通过 3D 非接触表面形貌扫描仪测量腐蚀钢板的表面特征，并基于表面粗糙度理论和分形理论进行分析。结果表明，0.5% CH的混合溶液3COONa和0.2% NaCl会对钢表面产生点腐蚀，电解腐蚀后钢试样的表面形貌与中性盐雾加速腐蚀试验结果一致。验证了该溶液中的电解加速腐蚀可以合理地模拟实际的大气腐蚀。