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Journal of Chinese Society for Corrosion and protection  2014, Vol. 34 Issue (1): 70-74    DOI: 10.11902/1005.4537.2013.119
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Effect of Micro-alloying Elements on Corrosion Resistance of Low Carbon Steels
CHAO Yuelin(), ZHOU Yuli, DI Quankang, WANG Lifeng, CHENG Sihua
Shougang Research Institute of Technology, Beijing 100043, China
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Abstract  

选择Cu-P-Cr-Ni钢、Cu-P-Cr钢和Q235碳钢,在0.01 mol/L的NaHSO3溶液中进行周期浸润、阻抗谱和极化曲线实验,研究了Cu-P-Cr-Ni系合金钢相比Q235碳钢在模拟工业大气 (SO2) 环境下的耐腐蚀性能；利用SEM, EPMA面扫描和XRD分析腐蚀锈层的形貌、组成及Cu,Cr和Ni的元素分布情况。结果表明：Cu-P-Cr-Ni系钢的腐蚀诱发敏感性最低,其次为Cu-P-Cr钢,腐蚀速率分别为Q235碳钢的59.5%和52.8%；锈层分为内、外两层,致密的内锈层明显发生Cu的颗粒状、Cr的团聚状富集,外锈层主要有Cr的富集,Ni富集不明显。Cu和Cr等的富集可形成致密的内锈层,提高低碳钢的耐蚀性。
Key words:  corrosion resistant steel      EPMA      Cu-P-Cr-Ni      cyclic immersion corrosion test      carbon steel     
Received:  06 June 2013     
ZTFLH:  TG174.2  
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Articles by authors
Yuelin CHAO
Yuli ZHOU
Quankang DI
Lifeng WANG
Sihua CHENG

Cite this article: 

CHAO Yuelin, ZHOU Yuli, DI Quankang, WANG Lifeng, CHENG Sihua. Effect of Micro-alloying Elements on Corrosion Resistance of Low Carbon Steels. Journal of Chinese Society for Corrosion and protection, 2014, 34(1): 70-74.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.119     OR     https://www.jcscp.org/EN/Y2014/V34/I1/70

No. C Si Mn P S Cu Cr Ni
1 ≤0.2 ≤0.6 ≤1.0 0.05~0.1 0.004 0.3~0.5 0.3~0.6 ---
2 ≤0.2 ≤0.6 ≤1.0 0.05~0.1 0.004 0.3~0.5 0.3~0.6 0.2~0.3
3 ≤0.2 ≤0.6 ≤1.6 0.005 0.005 --- --- ---
Table 1  Chemical compositions of three experimental steels
Fig.1  Polarization curves of three steels in 0.01 mol/L NaHSO3 solution
Fig.2  Electrochemical impedance spectroscopies of three steels in 0.01 mol/L NaHSO3 solution
No. Time Weight before test Blank sample weight loss Corrosion weight loss Corrosion
rate 		Average corrosion rate
h g g g g/(m2h) g/(m2h)
1 72 76.0826 0.0101 0.5255 2.5160 2.4083
76.6427 0.4597 2.1919
76.2576 0.5270 2.5169
2 72 76.4427 0.0133 0.4323 2.0626 2.1411
76.4459 0.4351 2.0726
76.4468 0.4770 2.2882
3 72 77.5290 0.0182 0.8779 4.1667 4.0492
77.6723 0.8573 4.0618
78.2529 0.8333 3.9192
Table 2  Corrosion weight-loss rate of three steels during periodic immersion test in 0.01 mol/L NaHSO3 solution
Fig.3  Surface morphology (a), cross section image (d) and corresponding element mappings (b, c, e, f) of corrosion layer formed on Cu-P-Cr steel
Fig.4  Surface morphology (a), cross section image (e) and corresponding element mappings (b~d, f~h) of corrosion layer formed on Cu-P-Cr-Ni steel
Fig.5  

3种钢在0.01 mol/L NaHSO3溶液中腐蚀产物的XRD谱
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