Study on Hydrogen Permeation in DP and Q&P Grades of AHSS under Cathodic Charging and Simulated Service Conditions
The hydrogen permeation behaviour of DP and Q&P grades of advanced high strength steels was investigated using the permeability experiments(1)under cathodic charging at different potentials in 0.1 M NaOH solution,(2)in 3%NaCl solution at the free potential simulating the corrosion behaviour of non-galvanized steel in service and(3)at zinc potential for the corrosion condition of the galvanized steel during actual service.Under cathodic charging at different potentials in 0.1 M NaOH solution,hydrogen permeation decreased with less negative charging potential,reflected by lower values of permeation rate and diffusion coefficient.At the most severe charging condition of –1.700 VHg/HgO in the 0.1 M NaOH solution,the permeation rate for 1200 DP-GI steel was 1.53 μA/cm and for 980 QP steel was 0.492 μA/cm.The values for 1200 DP-GI and 980 QP steels at the least severe charging condition of –1.100 VHg/HgO were 0.178 μA/cm and 0.111 μA/cm,respectively.The hydrogen permeation rate under simulated service conditions in 3%NaCl solution was significantly lower than the value under the least negative cathodic charging potential of –1.100 VHg/HgO in NaOH solution.The Zn coating on the 1200 DP-GI steel could protect the substrate steel from corrosion,however,once the Zn coating was corroded under actual service,more hydrogen would be introduced into and permeate through the steel.
steel hydrogen permeation corrosion
Liu Qinglong Venezuela Jeffrey Zhang Mingxing Zhou Qingjun Atrens Andrej
The University of Queensland,Division of Materials,School of Mining and Mechanical Engineering,St. L Baoshan Iron & Steel Co.,Ltd.,Research Institute,Shanghai 201900,China
国内会议
上海
英文
1-9
2015-10-21（万方平台首次上网日期，不代表论文的发表时间）