INVESTIGATION ON PITTING CORROSION BEHAVIOR OF COPPER IN THE MIXED SOLUTION OF HCO3-, SO42- AND Cl-

WANG Changgang; DONG Junhua; KE Wei; LI Xiaofang

doi:10.3724/SP.J.1037.2012.00357

Acta Metall Sin >

2013 , Vol. 49 >Issue 2: 207 - 213

DOI: https://doi.org/10.3724/SP.J.1037.2012.00357

INVESTIGATION ON PITTING CORROSION BEHAVIOR OF COPPER IN THE MIXED SOLUTION OF HCO₃^-, SO₄^2- AND Cl^-

WANG Changgang ,
DONG Junhua ,
KE Wei ,
LI Xiaofang

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State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Received date: 2012-06-15

Revised date: 2012-10-28

Online published: 2013-02-11

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Abstract

In this work, the pitting corrosion behavior of Cu in the mixed solution of HCO₃^-, Cl^- and SO₄^2- simulating groundwater was investigated by means of cyclic polarization test and SEM microscopy. The results showed that both SO₄^2- and Cl^- can synergistically promote the anodic dissolution of Cu electrode. Cl^- can decrease the corrosion potential of Cu to enhance its electrochemical activity. The plot of pitting sensitivity of Cu showed that the pitting critical concentration of Cl^- was 0.02 mol/L. When the concentration of Cl^- was low, SO₄^2- did not affect the pitting susceptibility; when the concentration of Cl^- was in the middle, SO₄^2- strongly inhibited the pitting corrosion of Cu; when the concentration of Cl^- was high, the pitting susceptibility will first increase and then reduce with increasing the concentration of SO₄^2-. Regardless of what concentration of SO₄^2-, Cl^- can promote the pitting corrosion of Cu. In the current solution system, it is found that the pitting corrosion of Cu was sorely sensitive to SO₄^2- and Cl^-.

Key words： high-level radioactive waste; copper; pitting; HCO₃^-, SO₄^2-; Cl^-

Cite this article

WANG Changgang , DONG Junhua , KE Wei , LI Xiaofang . INVESTIGATION ON PITTING CORROSION BEHAVIOR OF COPPER IN THE MIXED SOLUTION OF HCO₃^-, SO₄^2- AND Cl^-[J]. Acta Metall Sin, 2013 , 49(2) : 207 -213 . DOI: 10.3724/SP.J.1037.2012.00357

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