Corrosion Evaluation Indicators and Extraction Method of Structural Steel Based on Morphology
WANG Youde1,2, SHI Tao1, XIA Min1, XU Shanhua1
1 Key Laboratory of Engineering Structural Safety and Durability, Xi'an University of Architecture and Technology, Xi'an 710055, China; 2 Postdoctoral Innovation Base, Xi'an University of Architecture and Technology & Shaanxi Non-ferrous Construction Co., Ltd., Xi'an 710061, China
Abstract: Through summarizing and analyzing the existing corrosion evaluation indicators, an evaluation indicators system for corrosion degree of structural steel were put forward. A three-dimensional non-contact profiler was employed to measure the surface morphology of artificially accele-rated corroded steel plates, and a morphology-based method to extract the corrosion indicators was proposed accompanied with a corresponding calculation algorithm. Through the statistical analysis of extracted results, it was found that with the increase of corrosion age, the corrosion da-mage parameter Dn gradually increased, and the minimum cross-sectional area Ama and the corrosion grade parameter φ gradually decreased. All test pieces were in the state of “slight corrosion”. Besides, the mean value of corrosion depth Δtave, the standard deviation of corrosion depth tsd, the pit depth h and its distribution range were gradually increased, and the pit density Pd was gradually reduced. Meanwhile, the shape of pits was gradually changed from a cylinder or hemisphere to a cone.
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