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中国腐蚀与防护学报  2016, Vol. 36 Issue (2): 177-184    DOI: 10.11902/1005.4537.2015.079
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节节草提取物在盐酸介质中对碳钢的缓蚀行为研究
陈文(),管春平,杨申明,胡小安
楚雄师范学院化学与生命科学系 楚雄 675000
Corrosion Inhibition of Equisetum Ramosissimum Extractive for Carbon Steel in Hydrochloric Acid Solution
Wen CHEN(),Chunping GUAN,Shenming YANG,Xiaoan HU
Department of Chemistry and Life Science, Chuxiong Normal University, Chuxiong 675000, China
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摘要: 

利用极化曲线、电化学阻抗谱研究了节节草提取物对Q235钢在盐酸溶液中的缓蚀性能。结果表明,采用热水浸提法得到的节节草提取物,可明显减缓Q235钢在1 molL-1 HCl溶液中的腐蚀,属阴极抑制为主的混合型缓蚀剂。提取物的缓蚀性能随浓度增大而增强,并在实验温度范围内较稳定。阻抗数据拟合结果表明,提取物中的缓蚀剂分子在Q235钢表面的吸附同时符合Langmuir 和Dhar-Flory-Huggins等温吸附方程。光谱分析和SEM观察分别证实了提取物在Q235钢表面的吸附及其对Q235钢在盐酸中的缓蚀作用。
关键词 ： Q235钢,  节节草,  极化曲线,  电化学阻抗谱    
Abstract：

The inhibition effect of Equisetum ramosissimum extractive (ERE), extracted by hot water extraction method, on the corrosion of Q235 steel in 1 molL-1 HCl solution was investigated by means of polarization curves and electrochemical impedance spectroscopy (EIS). The results showed that ERE could effectively inhibited the steel corrosion, and acted as a mixed-type inhibitor with predominant control of the cathodic reaction. The inhibition efficiency increased with increasing dose of the extractive and was stable within the range of experimental temperature (20~50 ℃). By fitting the EIS data, it was found that the adsorption of ERE molecules on the steel surface obeyed both the Langmuir and the Dhar-Flory-Huggins adsorption isotherms. Spectroscopic analysis and scanning electron microscope observation confirmed existence of a adsorbed film of ERE on the steel surface.
Key words： Q235 steel    equisetum ramosissimum    polarization curve    electrochemical impedance spectroscopy
    
基金资助:国家自然科学基金项目 (51361001)和楚雄师范学院学术骨干培养项目 (12YJGG02) 资助
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陈文
管春平
杨申明
胡小安

引用本文:

陈文,管春平,杨申明,胡小安. 节节草提取物在盐酸介质中对碳钢的缓蚀行为研究[J]. 中国腐蚀与防护学报, 2016, 36(2): 177-184.
Wen CHEN, Chunping GUAN, Shenming YANG, Xiaoan HU. Corrosion Inhibition of Equisetum Ramosissimum Extractive for Carbon Steel in Hydrochloric Acid Solution. Journal of Chinese Society for Corrosion and protection, 2016, 36(2): 177-184.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.079      或      https://www.jcscp.org/CN/Y2016/V36/I2/177

图1  不同温度下Q235钢在含不同浓度ERE的1 molL-1盐酸中的极化曲线
Temperature / ℃ c / mgL-1 Ecorr / mV ba / mVdec-1 bc / mVdec-1 Icorr / μAcm-2 IE / %
20 Blank -432 97.9 124.8 1265
30 -457 68.3 101.7 241 81.0
60 -453 69.5 105.7 203 84.0
150 -449 74.6 109.8 174 86.2
300 -467 73.8 120.0 138 89.1
600 -464 74.4 136.0 128 89.9
30 Blank -439 103.2 135.7 2369 ---
30 -450 72.4 94.4 350 85.2
60 -455 74.6 100.1 327 86.2
150 -471 72.6 100.9 178 92.5
300 -475 74.2 104.3 156 93.4
600 -492 83.2 107.6 150 93.7
40 Blank -423 102.5 139.9 5772 ---
30 -429 82.9 141.2 188 67.3
60 -438 66.4 112.5 653 88.7
150 -450 68.2 109.9 378 93.4
300 -465 69.7 105.7 339 94.1
600 -470 74.7 107.3 281 95.1
50 Blank -398 101.3 131.2 6335 ---
30 -411 82.1 129.5 3005 52.6
60 -430 89.3 131.2 1818 71.3
150 -441 69.5 116.2 997 84.3
300 -448 78.3 118.8 854 86.5
600 -448 85.7 118.4 779 87.7
表1  不同温度下Q235钢在含不同浓度ERE的 1 molL-1盐酸中的极化曲线拟合参数
图2  不同温度下Q235钢在含不同浓度ERE的1 molL-1盐酸中的Nyquist图
图3  Q235钢在空白和添加ERE体系的1 molL-1盐酸溶液中的等效电路图
Temperature / ℃ c / mgL-1 Cdl / μFcm-2 Rct / Ωcm2 Cf / mFcm-2 Rf / Ωcm2 IE / %
20 Blank 257 22.7 --- --- ---
30 117 117.4 18.9 15.6 82.9
60 102 143.9 13.9 29.2 86.8
150 86 175.6 25.2 56.3 90.2
300 66 249.6 8.6 72.9 92.9
600 61 283.2 5.8 101.4 94.1
30 Blank 334 14.8 --- --- ---
30 175 40.8 10.9 17.2 74.5
60 112 78.3 37.2 10.5 83.3
150 64 144.5 17.0 22.2 91.1
300 52 162.7 23.3 38.1 92.6
600 44 187.6 11.0 53.6 93.9
40 Blank 574 8.3 --- --- ---
30 201 24.73 15.6 2.2 69.1
60 132 49.4 22.9 4.7 84.6
150 76 67.9 13.7 9.9 89.3
300 52 83.8 10.2 16.9 91.7
600 47 92.9 2.3 22.6 92.8
50 Blank 761 4.6 --- --- ---
30 375 9.0 20.9 1.4 55.7
60 161 20.9 22.3 1.9 79.8
150 109 27.4 12.8 4.9 85.7
300 77 36.2 10.7 8.6 89.7
600 68 42.9 19.4 12.0 91.6
表2  不同温度下Q235钢在含不同浓度缓蚀剂的1 molL-1盐酸中的阻抗图谱拟合结果
图4  Langmuir和Dhar-Flory-Huggins吸附等温线
Temperature / ℃ Adsorption isotherm model R2 Kads / Lmg-1 x ΔGadsθ / kJmol-1
20 Langmiur 0.999 0.162 --- -29.2
Dhar-Flory-Huggins 0.983 1.077 3.01 -33.8
30 Langmiur 0.999 0.119 --- -29.4
Dhar-Flory-Huggins 0.982 2.367 3.53 -37.0
40 Langmiur 0.999 0.111 --- -30.2
Dhar-Flory-Huggins 0.973 2.151 3.79 -37.9
50 Langmiur 0.999 0.063 --- -29.7
Dhar-Flory-Huggins 0.985 0.250 2.74 -33.4
表3  Langmiur和Dhar-Flory-Huggins吸附模型的拟合参数
图5  ERE吸附膜层的红外谱图
图6  含150 gL-1ERE的HCl空白溶液以及Q235钢试样浸泡24 h后的紫外光谱
图7  Q235钢试片在盐酸中浸泡8 h后的表面SEM像
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