（内蒙古科技大学材料与冶金学院，内蒙古包头 014000 ）
Study on corrosion behaviorof 07MnVTiNb weathering steel in simulated coastal atmospheric environment
Wu Zhifeng，SONG Yiquan
（School of material andmetallurgy，InnerMongolia University of Science and Technology，Baotou 014000，china）
Key words：Alternate wetting and drying;XRD;Corrosionrate; AC impedance(EIS)
The corrosion behavior and behavior of 07MnVTiNbweathering steel in coastal atmospheric environment were studied by laboratorysimulation.
The corrosion products were analyzed by using X-raydiffraction spectrum.
The electrochemical characteristicsof bare steel and rust sample were studied by means of dynamic potentialpolarization curves and AC impedance spectroscopy (EIS). The results show thatthe corrosion rate is higher than that of the later stage. The corrosioncurrent density of the sample with La is smaller, and the corrosion resistanceof the rust layer is larger, which indicates that the corrosion resistance ofLa sample is better, and the corrosion potential is moving forward with thealternation of wet and dry etching. 07MnVTiNb weathering steel corrosionproducts contains α -FeOOH, β-FeOOH, a small amount of γ -FeOOH and Fe2O3.Thethe specimens with addition of La obtained the protective rust layer α-FeOOH more, resulting in the better adhesion of the matrix.