Abstract
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.
Funding source: The National Key Research and Development Program of China 10.13039/501100012166
Award Identifier / Grant number: 2018YFC1504304
Funding source: The Postgraduate Innovation Research Project of Tianjin
Award Identifier / Grant number: 2019YJSB166
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: The reported research work was sponsored by the National Key Research and Development Program of China (2018YFC1504304) and The Postgraduate Innovation Research Project of Tianjin (2019YJSB166).
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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