Optimizing the Resistance of Advanced Weathering Steel to Marine Atmospheric Corrosion With the Addition of Al

Abstract

In this article, dry and wet alternating cycle corrosion scenarios were simulated by accelerated corrosion tests under 1.0 × 10⁻²mol/L NaHSO₃ + 0.1 mol/L NaCl corrosion conditions. Field emission electron microprobe, X-ray diffraction, Raman spectroscopy and electrochemical testing were utilized to study the effect of Al element on the corrosion resistance of weathering steel. Using Materials Studio software, calculate that the addition of Al element will be uniformly distributed in the rust layer with lower binding energy (such as aluminum oxide or doped with other oxides). The synergistic effect of Al and Cr not only produces more stable FeAl₂O₁ in the early stage of corrosion, slowing down the corrosion rate, but also promotes the formation of α−(Fe_1−xCr_x) OOH and the transformation of γ-FeOOH, refining the grain size of α-FeOOH and enhancing its resistance to external corrosion factors.