2-巯基嘧啶对冷轧钢在乙酸溶液中的缓蚀作用
Corrosion Inhibition of 2-Mercaptopyrimidine to Cold Rolled Steel in Acetic Acid Solution
摘 要
采用失重法、电化学法、扫描电子显微镜（SEM）和红外光谱（FTIR）研究了2-巯基嘧啶（MP）对冷轧钢在乙酸（CH3COOH）溶液中的缓蚀作用。结果表明：MP对冷轧钢在2.5 mol/L乙酸溶液中具有良好的缓蚀效果，在MP浓度为2.0 mmol/L，温度为20~40℃条件下，失重法测得最大缓蚀率均超过92%；MP在冷轧钢表面的吸附规律符合Temkin吸附等温式，该吸附过程放热且伴随熵增加，为包含物理吸附与化学吸附的混合吸附过程；MP为通过"几何覆盖效应"起作用的混合抑制型缓蚀剂；Nyquist图呈单一时间常数的弥散容抗弧，添加MP后电荷转移电阻显著增大，但双电层电容值明显下降；MP在冷轧钢表面形成吸附膜层，该吸附膜层主要含有MP及Fe（CH3COO）2、FeOOH和Fe2O3。
乙酸
2-巯基嘧啶(MP)
缓蚀
吸附
cold rolled steel
acetic acid
2-mercaptopyrimidine (MP)
inhibition
adsorption
Abstract
The corrosion inhibition of 2-mercaptopyrimidine (MP) on cold rolled steel (CRS) in acetic acid (CH3COOH) solution was studied by weight loss method, electrochemical techniques, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The results show that MP had an effective corrosion inhibition for CRS in acetic acid solution, and the maximum inhibition efficiency values tested by weight loss method were higher than 92% when the MP concentration was 2.0 mmol/L and the temperatures were in the range of 20-40℃. The adsorption of MP on CRS surface obeyed Temkin adsorption isotherm. It was an exothermic adsorption process accompanied by the increase of entropy. This adsorption process also involved both physical and chemical adsorptions. MP was a mixed-type corrosion inhibitor, which worked through "geometric blocking effect". Nyquist plots exhibited an individual depressed capacitive loop with only one time constant, and the charge transfer resistance value increased prominently after adding MP to acetic acid solution, but the double layer capacitance decreased notably. An adsorption layer formed on the surface of CRS, which was mainly composed of MP, Fe(CH3COO)2, FeOOH and Fe2O3.
中图分类号 TG174.42 DOI 10.11973/fsyfh-201810001
所属栏目 试验研究
基金项目 国家自然科学基金项目（51361027）；云南省中青年学术和技术带头人人才培养项目（2015HB049）；西南林业大学科研启动基金项目（111435）
收稿日期 2017/4/9
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引用该论文: LI Xianghong,DENG Shuduan,LIU Xiangyi,LIU Jianxiang. Corrosion Inhibition of 2-Mercaptopyrimidine to Cold Rolled Steel in Acetic Acid Solution[J]. Corrosion & Protection, 2018, 39(10): 733
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参考文献
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【3】AWAD H S,ABDEL G S. Mechanism of inhibition of iron corrosion in hydrochloric acid by pyrimidine and series of its derivatives[J]. Anti-Corrosion Methods and Materials,2005,52:328-336.
【4】李向红,谢小光. 嘧啶衍生物对钢在盐酸溶液中的缓蚀作用[J]. 物理化学学报,2013,29(10):2221-2231.
【5】ZUCCHI F,TRABANELLI G,BRUNORO G. Corrosion inhibition of carbon and low-alloy steel in sulfuric acid solutions by 2-mercaptopyrimidine derivatives[J]. Materials and Corrosion,1993,44(6):264-268.
【6】WANG L. Inhibition effect of 2-mercaptopyrimidine on the corrosion of a low carbon steel in phosphoric acid[J]. Corrosion Science,2001,41:1637-1644.
【7】李向红,邓书端,刘祥义,等. 2-巯基嘧啶对冷轧钢在H3PO4溶液中的缓蚀作用[J]. 腐蚀与防护,2016,37(增):54-57.
【8】LI X H,DENG S D,LIN T,et al. 2-Mercaptopyrimidine as an effective inhibitor for the corrosion of cold rolled steel in HNO3 solution[J]. Corrosion Science,2017,118:202-216.
【9】赵书振,许立宁,窦娟娟,等. 醋酸对X70管线钢CO2湿气顶部腐蚀行为影响[J]. 中国腐蚀与防护学报,2016,36(3):231-237.
【10】ABD E L,WANEES S,ALAHMDI M I,et al. 4,6-dimethyl-2-oxo-1,2-dihydro-pyridine-3-carboxylic acid as an inhibitor towards the corrosion of C-steel in acetic acid[J]. International Journal of Electrochemical Science,2016,11:3448-3446.
【11】QURAISHI M A,SHARMA H K. Inhibition of mild steel corrosion in formic and acetic acid solutions[J]. Indian Journal of Science and Technology,2004,4(11):331-336.
【12】QURAISHI M A,SHARMA H K. Thiazoles as corrosion inhibitors for mild steel in formic and acetic acid solutions[J]. Journal of Applied Electrochemistry,2005,35:33-39.
【13】RAFIQUEE M Z A,KHAN S,SAZENA N,et al. Influence of some thiadiazole derivatives on corrosion inhibition of mild steel in formic and acetic acid media[J]. Portugaliae Electrochimica Acta,2007,25:419-434.
【14】LI X H,XIE X G,DENG S D,et al. Inhibition effect of two mercaptopyrimidine derivatives on cold rolled steel in HCl solution[J]. Corrosion Science,2015,92:136-147.
【15】MAAYA A K,AL-RAWASHDEH N A F. Inhibition of acidic corrosion of pure aluminum by some organic compounds[J]. Corrosion Science,2004,46:1129-1140.
【16】木冠南,李向红,屈庆,等. 稀土铈(IV)离子和钼酸钠在盐酸溶液中对冷轧钢的缓蚀协同作用[J]. 化学学报,2004,62(24):2386-2390.
【17】FUJIWARA S,KAMBE N. Topics in current chemistry[M]. Berlin,Heidelberg:Springer,2015:87-140.
【18】CAO C. On electrochemical techniques for interface inhibitor research[J]. Corrosion Science,1996,38:2073-2082.
【19】MANSFELD F. Recording and analysis of AC impedance data for corrosion studies[J]. Corrosion,1981,37:301-307.
【20】SINGH M M,GUPTA A. Corrosion behavior of mild steel in formic acid solutions[J]. Materials Chemistry and Physics,1996,46:15-22.
【21】TRAN T,BROWN B,NEŠC S,et al. Investigation of the electrochemical mechanisms for acetic acid corrosion of mild steel[J]. Corrosion,2014(70):223-229.
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