EFFECT OF SO2 ON CORROSION EVOLUTION OF Q235B STEEL IN SIMULATED COASTAL- INDUSTRIAL ATMOSPHERE

doi:10.3724/SP.J.1037.2013.00738

Acta Metall Sin

2014, Vol. 50

Issue (7): 802-810 DOI: 10.3724/SP.J.1037.2013.00738

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EFFECT OF SO₂ ON CORROSION EVOLUTION OF Q235B STEEL IN SIMULATED COASTAL- INDUSTRIAL ATMOSPHERE

CHEN Wenjuan, HAO Long, DONG Junhua(

), KE Wei, WEN Huailiang

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

Cite this article:

CHEN Wenjuan, HAO Long, DONG Junhua, KE Wei, WEN Huailiang. EFFECT OF SO₂ ON CORROSION EVOLUTION OF Q235B STEEL IN SIMULATED COASTAL- INDUSTRIAL ATMOSPHERE. Acta Metall Sin, 2014, 50(7): 802-810.

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Abstract

采用循环干/湿模拟腐蚀增重实验、动电位极化曲线、电化学阻抗谱和XRD方法, 研究了模拟海岸-工业大气中SO₂对Q235B钢腐蚀行为的影响. 结果表明, 在腐蚀初期SO₂抑制了Q235B钢的腐蚀; 在腐蚀后期, SO₂促进了Q235B钢的腐蚀. 当SO₂的浓度较低时, 腐蚀速率随SO₂浓度的升高而增大; 当SO₂的浓度较高时, 腐蚀速率随SO₂浓度的升高而减小. 工业-海岸大气中的SO₂组分可以抑制腐蚀产物中g -FeOOH和b-FeOOH的生成, 而促进a-FeOOH生成. 低碳钢腐蚀速率随SO₂浓度变化出现的极值现象与SO₂导致的锈层相组分变化密切相关.

Key words: Q235B steel dry/wet cyclic coastal-industrial atmospheric corrosion rust

Received: 15 November 2013

ZTFLH:

TG172.3

Fund: Supported by National Natural Science Foundation of China (Nos.51201170 and 51131007)

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	Wenjuan CHEN
	Long HAO
	Junhua DONG
	Wei KE
	Huailiang WEN

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00738 OR https://www.ams.org.cn/EN/Y2014/V50/I7/802

Fig.1

Q235B钢在模拟海岸大气和模拟工业-海岸大气中的腐蚀增重曲线

Fig.2

Q235B钢在模拟海岸大气和模拟工业-海岸大气中平均腐蚀速率-腐蚀周期(V_a-N)的双对数曲线

表1 Q235B钢在模拟海岸大气和模拟工业-海岸大气中的幂指数n

Fig.3

Q235B钢在模拟海岸大气和工业-海岸大气中瞬时腐蚀速率-腐蚀周期(V_f-N)的双对数曲线

Fig.4

Q235B钢在模拟海岸大气和模拟工业-海岸大气中10和120 CCT后腐蚀产物的XRD谱

Fig.5

Q235B钢在模拟海岸大气和模拟工业-海岸大气中经过不同腐蚀周期的阻抗谱

Fig.6

Q235B钢在模拟海岸大气和模拟工业-海岸大气中经过不同腐蚀周期的阻抗谱

Fig.7

拟合Q235B钢带锈电极电化学阻抗谱的等效电路

Fig.8

Q235B钢的电化学阻抗谱拟合结果

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