Galvanic Corrosion of T2 Cu-alloy and Q235 Steel in Simulated Beishan Groundwater Environment

doi:10.11902/1005.4537.2024.049

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (6): 1435-1442 DOI: 10.11902/1005.4537.2024.049

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Galvanic Corrosion of T2 Cu-alloy and Q235 Steel in Simulated Beishan Groundwater Environment

PANG Jie¹^,², LIU Xiangju¹(

), LIU Nazhen¹(

), HOU Baorong¹

1. Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2. University of Chinese Academy of Sciences, Beijing 100101, China

Cite this article:

PANG Jie, LIU Xiangju, LIU Nazhen, HOU Baorong. Galvanic Corrosion of T2 Cu-alloy and Q235 Steel in Simulated Beishan Groundwater Environment. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1435-1442.

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Abstract

In this study, the galvanic corrosion behavior of T2 Cu-alloy and Q235 steel in solutions containing Na₂SO₄ and NaCl with various amount of Cl^- was investigated by electrochemical tests and corrosion product analysis. The results show that T2 Cu-alloy acts as cathode, while Q235 steel as anode for the galvanic couple, therefore Q235 steel experiences corrosion with accelerating rate; With the increasing of Cl^- concentration, the galvanic current density (I_g) of the galvanic couple exhibits a maximum due to the decrease of dissolved oxygen content in the solution, the decrease of oxygen diffusion coefficient and the increase of solution conductivity etc.; As the area ratio of T2 Cu-alloy to 235 steel increases, I_g increases significantly, indicating that the galvanic corrosion reaction is controlled by cathodic reaction; When the temperature increases from 25^oC to 50^oC, I_g increases and a maximum occurs at lower Cl^- concentrations; galvanic potential (E_g) shifted negatively with the increasing Cl^- concentration as influenced by dissolved oxygen. The results of this study may provide a reference for understanding the influence of Cl^- concentration on galvanic corrosion of Cu-coated carbon steel metal containers.

Key words: T2 Cu-alloy Q235 steel Cl^- concentration galvanic corrosion

Received: 14 February 2024 32134.14.1005.4537.2024.049

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52201092);Shandong Provincial Natural Science Foundation(ZR2022QB128)

Corresponding Authors: LIU Xiangju, E-mail: liuxiangju124@163.com；
LIU Nazhen, E-mail: liunazhen@qdio.ac.cn

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.049 OR https://www.jcscp.org/EN/Y2024/V44/I6/1435

Fig.1 OCP-t curves of T2 Cu-based alloy and Q235 steel in simplified Beishan groundwater simulation fluid

Fig.2 Influences of Cl^- concentration on OCP values of T2 Cu-based alloy and Q235 steel at 25^oC

Fig.3 Polarization curves of T2 Cu-based alloy (a) and Q235 steel (b) in test solutions with different Cl^- concentrations at 25^oC

Table 1 Fitting parameters of polarization curves of T2 Cu-based alloy and Q235 steel

Fig.4 Influences of Cl^- concentration on galvanic current density (a) and galvanic potential (b) of Q235 steel at 25^oC

Fig.5 Influences of Cl^- concentration on galvanic current density (a) and galvanic potential (b) of Q235 steel at 50^oC

Fig.6 Variations of electrical conductivity of the test solution with Cl^- concentration at 25^oC and 50^oC

Fig.7 SEM surface morphologies of Q235 steel after corrosion at 25^oC under the conditions of the area ratio of 10∶1 and Cl^- concentrations of 0.001 mol·L^-1 (a, b), 0.05 mol·L^-1 (c, d), and 2 mol·L^-1 (e, f)

Fig.8 Raman spectra of inner layer (a, b) and out layer (c, d) of corrosion products formed on Q235 steel after galvanic corrosion, at 25^oC with [Cl^-] = 0.05 mol·L^-1, Cu/carbon steel area ratio = 10∶1

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