Integrated analysis method of 3D corrosion evolution and mechanics of steel based on electrochemical corrosion mechanism

As the primary raw material of steel structure buildings, steel is sensitive to environmental factors and prone to electrochemical corrosion, which poses a serious threat to the safety of the whole structure. The mechanical property degradation of steel structures after corrosion is not only related to the corrosion depth but also closely related to the uneven corrosion morphology and location distribution in 3D space. Based on this, this paper proposed an integrated method that can realize the 3D corrosion evolution prediction process on steel member surface and the evaluation of its mechanical properties respectively. Through the method, the real-time dynamic changes of 3D corrosion interface can be tracked based on electrochemical corrosion mechanism and level-set model. Then the results of corrosion evolution can be conveniently converted into mechanical analysis models for loading solution. The prediction effect and mechanical analysis function of the method were verified by a salt spray exposure corrosion test of Q235 steel and a compression loading test of a long-term corroded steel plate. The integrated method can provide a method support for predicting the remaining service life of steel structures in corrosive environments, reasonably selecting maintenance time and preventing collapse in the future.