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Abstract

To investigate the strong corrosion effect of 36% industrial hydrochloric acid on Q370 steel for bridges at room temperature. The surface morphology variations of the Q370 steel for bridges with corrosion time were measured and analyzed using a three-dimensional non-contact scanning profilometer. Subsequently, the standard monotonic tensile test was carried out to obtain the load-displacement curve and analyze the mechanical properties of the heavily corroded steel. Moreover, the constitutive model parameters of the heavily corroded steel were optimized. Furthermore, the heavily corroded steel model base on the actual corroded surface morphology was established, employing three-dimensional reverse reconstruction technology and finite element software. Results indicated that the growth of the surface arithmetic average height Sa and the surface pits root-mean-square altitude Sq were at high rates and almost linear from 1h to 4h but gradually tended to zero in the following corrosion time. When the corrosion time reached 72h, the skewness of the height distribution Ssk and the sharpness of the height distribution Sku tended to 0 and 3, respectively. In addition, the nominal yield strength, nominal tensile strength, elongation, and elastic modulus of steel decreased by 9.31%, 9.37%, 35.68%, and 19.96%, respectively. Finally, the finite element simulation results were almost the same as the experimental results, which could provide a reference for practical engineering.

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