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Effect of Alternating Stress Frequency on Corrosion Electrochemical Behavior of E690 Steel in 3.5%NaCl Solution |
ZHANG Teng, LIU Jing( ), HUANG Feng, HU Qian, GE Fangyu |
Hubei Engineering Technology Research Center of Marine Materials and Service Safety, State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China |
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Abstract The corrosion behavior of E690 steel in 3.5% (mass fraction) NaCl solution by applied elastic alternating stresses of different frequencies (0.1, 0.5, 1.0, 1.3, 1.8 and 2.0 Hz) was studied by electrochemical test and surface characterization. Results show that there is a critical loading frequency for the applied alternating stress that divides the corrosion electrochemical behavior into two different regions. When loading frequency is below the critical frequency, the maximum strain rate of E690 steel and the number of active sites on steel surface increases with the increasing loading frequency. The corrosion process is mainly controlled by activation. The corrosion rate and the portion of localized corrosion area increase with the increase of the loading frequency. When loading frequency is higher than the critical frequency, the corrosion process is mainly controlled by diffusion. Hence, the loading frequency has little impact on the corrosion rate and localized corrosion area.
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Received: 16 December 2019
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Fund: National Natural Science Foundation of China(51871172) |
Corresponding Authors:
LIU Jing
E-mail: liujing@wust.edu.cn
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About author: LIU Jing, E-mail: liujing@wust.edu.cn
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