不同铬含量耐候钢在高湿热模拟环境中的耐腐蚀性能
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摘要
采用周期轮浸加速腐蚀试验箱模拟南海高湿热环境,在该环境中对2种铬质量分数(1.990%,3.194%)耐候钢进行周浸腐蚀试验,对周浸腐蚀不同时间的耐候钢进行了电化学试验,研究了不同耐候钢的耐腐蚀性能并与Q235钢(铬质量分数0.164%)的进行了对比。结果表明:铬含量越高,试验钢的腐蚀速率越小;在腐蚀初期,铬质量分数3.194%钢的自腐蚀电流密度最小,容抗弧半径较大,电荷转移电阻和总电阻(锈层电阻+电荷转移电阻)最大,耐腐蚀性能最好;在腐蚀后期,由于出现腐蚀加速现象,铬质量分数3.194%钢的锈层电阻、电荷转移电阻和总电阻均小于铬质量分数1.990%钢的。
Cyclic wet-dry corrosion testing was conducted on weathering steels containing Cr with two mass fractions(1.990%,3.194%)in simulated high temperature and humidity environment of the South China Sea with aperiodic wheel immersion accelerated corrosion chamber.Then electrochemical tests were conducted on the weathering steels after cyclic wet-dry corrosion for different times.The corrosion resistance of the weathering steels was studied and compared with that of Q235 steel(Cr mass fraction of 0.164%).The results show that the higher the Cr content,the lower the corrosion rate of the tested steel.In the initial stage of corrosion,the steel containing3.194% Cr had the smallest free-corrosion current density,relatively large capacitance arc radius and the largest charge transfer resistance and total resistance(rust layer resistance+charge transfer resistance),showing the best corrosion resistance.In the final stage of corrosion,due to accelerated corrosion,the rust layer resistance,charge transfer resistance and total resistance of the steel containing 3.194% Cr were lower than those of the steel containing 1.990% Cr.
Cyclic wet-dry corrosion testing was conducted on weathering steels containing Cr with two mass fractions(1.990%,3.194%)in simulated high temperature and humidity environment of the South China Sea with aperiodic wheel immersion accelerated corrosion chamber.Then electrochemical tests were conducted on the weathering steels after cyclic wet-dry corrosion for different times.The corrosion resistance of the weathering steels was studied and compared with that of Q235 steel(Cr mass fraction of 0.164%).The results show that the higher the Cr content,the lower the corrosion rate of the tested steel.In the initial stage of corrosion,the steel containing3.194% Cr had the smallest free-corrosion current density,relatively large capacitance arc radius and the largest charge transfer resistance and total resistance(rust layer resistance+charge transfer resistance),showing the best corrosion resistance.In the final stage of corrosion,due to accelerated corrosion,the rust layer resistance,charge transfer resistance and total resistance of the steel containing 3.194% Cr were lower than those of the steel containing 1.990% Cr.
引文
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[4]QIAN Y H,NIU D,XU J J,et al.The influence of chromium content on the electrochemical behavior of weathering steels[J].Corrosion Science,2013,71:72-77.
[5]YAMASHITA M,SHIMIZU T,KONISHI H,et al.Structure and protective performance of atmospheric corrosion product of Fe-Cr alloy film analyzed by M9ssbauer spectroscopy and with synchrotron radiation X-rays[J].Corrosion Science,2003,45(2):381-394.
[6]LARRABEE C P.Corrosion resistance of high-strength lowalloy steels as influenced by composition and environment[J].Corrosion,1953,9(8):259-271.
[7]刘志勇,陈邦文,陈吉清,等.武钢铁路车辆及集装箱用耐候钢的现状及发展[J].钢铁研究,2009,37(6):55-58.
[8]QIAN Y H,MA C H,NIU D,et al.Influence of alloyed chromium on the atmospheric corrosion resistance of weathering steels[J].Corrosion Science,2013,74:424-429.
[9]SCHWITTER H,BHNI H.Influence of accelerated weathering on the corrosion of low-alloy steels[J].Journal of the Electrochemical Society,1980,127(1):15-20.
[10]NISHIKATA A,YAMASHITA Y,KATAYAMA H,et al.An electrochemical impedance study on atmospheric corrosion of steels in a cyclic wet-dry condition[J].Corrosion Science,1995,37(12):2059-2069.
[11]MONTOYA P,DAZ I,GRANIZO N,et al.An study on accelerated corrosion testing of weathering steel[J].Materials Chemistry and Physics,2013,142(1):220-228.
[12]夏妍,曹发和,常林荣,等.锈层下碳钢和耐候钢的微区和宏观腐蚀电化学行为[J].高等学校化学学报,2013,34(5):1246-1253.
[13]施锦杰,孙伟.等效电路拟合钢筋锈蚀行为的电化学阻抗谱研究[J].腐蚀科学与防护技术,2011,23(5):387-392.
[14]王树涛,杨善武,高克玮,等.新型低碳贝氏体钢在含氯离子环境中的腐蚀行为和表观力学性能的变化[J].金属学报,2008,44(9):1116-1124.