EFFECTS OF SO42− AND Cl− ON ACTIVE/PASSIVE CORROSION BEHAVIORS OF LOW CARBON STEEL IN DEAERATED BICARBONATE SOLUTION

doi:10.3724/SP.J.1037.2011.00134

Acta Metall Sin

2011, Vol. 47

Issue (10): 1321-1326 DOI: 10.3724/SP.J.1037.2011.00134

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EFFECTS OF SO₄²⁻ AND Cl⁻ ON ACTIVE/PASSIVE CORROSION BEHAVIORS OF LOW CARBON STEEL IN DEAERATED BICARBONATE SOLUTION

YANG Jingfeng, DONG Junhua, KE Wei

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

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YANG Jingfeng DONG Junhua KE Wei. EFFECTS OF SO₄²⁻ AND Cl⁻ ON ACTIVE/PASSIVE CORROSION BEHAVIORS OF LOW CARBON STEEL IN DEAERATED BICARBONATE SOLUTION. Acta Metall Sin, 2011, 47(10): 1321-1326.

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Abstract The corrosion behaviors of low carbon steel, a kind of materials used in making metal container sealing high–level radioactive waste, in three deaerated bicarbonate solutions simulated the ground water, 0.1 mol/L NaHCO₃ solution, 0.1 mol/L NaHCO₃+0.1 mol/L Na₂SO₄ solution and 0.1 mol/L NaHCO₃+0.1 mol/L NaCl solution, were examined. The results in potential evolution revealed that the low carbon steel moved up to the passive state in 0.1 mol/L NaHCO₃ solution while moved up to the re–active state in the other solutions. SEM observations showed that the low carbon steel was not corroded in 0.1 mol/L NaHCO₃ solution, while homogeneous corrosion occurred in 0.1 mol/L NaHCO₃+0.1 mol/L Na₂SO₄ solution and local corrosion in the third solution. XRD analyses illustrated that the corrosion products are composed of Fe₃O₄ and α–FeOOH.

Key words: low carbon steel active/passive bicarbonate solution SO₄²⁻ Cl⁻

Received: 15 March 2011

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Supported by National Natural Science Foundation of China (No.51071160)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00134 OR https://www.ams.org.cn/EN/Y2011/V47/I10/1321

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