A newly developed rust layer on Q370qENH weathering steel(sample C)was studied under dry-wet cycle test of 3.5 wt.％NaCl solution and salt spray test,compared with the bare weathering steel(sample A)and the weathering steel with additive contents(CuSO4 0.2,FeSO4 0.1,NaHSO3 0.02,NaCl 0.02,Na2HPO4 0.01,and water balance,in mass％,termed as sample B).Corrosion mechanism of Q370qENH weathering steel after different surface treatments was investigated by means of surface potential scanning,mass change,polarization curve,and X-ray diffraction.The results of X-ray diffraction indicate that rust of bare weathering steel has rare Fe304,and a dense oxide layer mainly composed of Fe304 is formed on rust of both sample B and sample C.The surface potential of sample A gradually increases to-0.2 V in the dry-wet cycle test,while the surface potential of sample A maintains at about-0.6 V in the salt spray test.The surface potential of sample B and sample C is higher than that of sample A in the early stage and remains stable during the short-term accelerated corrosion test.Moreover,the mass change of sample C gradually stabilizes with time in the dry-wet cycle and salt spray test.The corrosion current of the sample A is lower than that of sample C in the initial stage of short-term accelerated corrosion test.However,the corrosion current of sample C is smaller than that of the sample A in the experiment.The main components of the deep rust of sample A are γ-FeOOH and α-FeOOH,while those of the deep rust of sample B and sample C are Fe304.

Shao-zheng Ma;Li-juan Sun;Hu-yuan Sun;Hong-bin Sun;Jin-feng Jiang;Yi-xin Yin;Shu-feng Qu;Zhen-hua Liu;Shao-xia Xu

Key Laboratory of Marine Environmental Corrosion and Bio-Fouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,Shandong,China;University of Chinese Academy of Sciences,Beijing 100049,China;Open Studio for Marine Corrosion and Protection,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,Shandong,China;Shandong Weilai High Speed Railway Co.,Ltd.,Jinan 250102,Shandong,China;School of Civil Engineering,Shandong University,Jinan 250061,Shandong,China;China Railway No.10 Engineering Group Co.,Ltd.,Qingdao 266034,Shandong,China

钢铁研究学报（英文版）

[1]Shao-zheng Ma;Li-juan Sun;Hu-yuan Sun;Hong-bin Sun;Jin-feng Jiang;Yi-xin Yin;Shu-feng Qu;Zhen-hua Liu;Shao-xia Xu-.Stabilization technology and corrosion mechanism of rust layer on Q370 weathering steel surface)[J].钢铁研究学报（英文版）,2022(10):1694-1709

Q370,Q370qENH

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