Corrosion Performance of Low Carbon Steels Containing Copper in Cl- Environment with Different pH Values

WANG Jianbin, XU Xiuting, XUE Yunsheng, LIU Hongyu, HAI Guoquan, GUO Jing, TENG Yingxue

doi:10.16577/j.issn.1001-1560.2024.0012

Materials Protection >

2024 , Vol. 57 >Issue 1: 80 - 87

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0012

Corrosion Performance of Low Carbon Steels Containing Copper in Cl^- Environment with Different pH Values

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(Faculty of Materials and Metallurgy，University of Science and Technology Liaoning，Anshan 114051，China)

TENG Yingxue (1979-)，Ph.D.，Associate Professor，Research Focus: Metal Corrosion，Tel.: 13898033251，E-mail: tengyingxue＠21cn.com

Received date: 2023-07-23

Revised date: 2023-08-12

Accepted date: 2023-09-12

Online published: 2024-01-30

Supported by

Innovation and Entrepreneurship Training Program for College Students (202310146029)；The National Natural Science Foundation of China (52074149)；The Key Project Liaoning Science and Techology Education Department (LJKZ0287)；The University of Science and Technology Liaoning Graduate Science Innovation Project (LKDYC202230)

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Abstract

For exploring the corrosion rules of copper-containing low carbon steel under different pH conditions，the electrochemical workstation and metallographic microscope were used to analyze the polarization curves，AC impedance spectra and micro morphologies of ordinary weathering steel (Q345)，copper-containing low carbon steel (0Cu3Cr) and hull copper-containing low carbon steel (0CuAl) in NaCl environments with different pH values.Additionally，the difference in corrosion performance between copper-containing steel and low carbon steel in NaCl environments with different pH values was observed.Results showed the self-corrosion potential of the three samples was higher in the NaCl environment with pH＝12.The corrosion processes of 0Cu3Cr and 0CuAl were controlled by the anodic dissolution reaction，while that of Q345 was controlled by the cathodic reaction.Moreover，the self-corrosion potential of Q345 and 0Cu3Cr at pH ＝6 was slightly greater than that at pH＝8.The charge transfer resistance values of the three kinds of samples were the largest in the NaCl environment with pH＝12.When pH＝6，the pitting pits on the surface of 0Cu3Cr were smaller and less numerous.When pH＝8，the pitting pits on the surface were larger and more numerous.Besides，the corrosion resistance of 0CuAl at pH＝8 was better than that at pH＝6.

Key words： Cl- environment; AC impedance; pH; polarization curve

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WANG Jianbin, XU Xiuting, XUE Yunsheng, LIU Hongyu, HAI Guoquan, GUO Jing, TENG Yingxue . Corrosion Performance of Low Carbon Steels Containing Copper in Cl^- Environment with Different pH Values[J]. Materials Protection, 2024 , 57(1) : 80 -87 . DOI: 10.16577/j.issn.1001-1560.2024.0012

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