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中国腐蚀与防护学报  2015, Vol. 35 Issue (4): 311-316    DOI: 10.11902/1005.4537.2014.106
  本期目录 | 过刊浏览 |
碱性溶液中L-半胱氨酸对AA5052铝合金阳极缓蚀作用研究
王大鹏,高立新,张大全()
Corrosion Inhibition of L-Cysteine for AA5052 Al-alloy Anode in Alkaline Solution
Dapeng WANG,Lixin GAO,Daquan ZHANG()
School of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
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摘要: 

采用析氢法、失重法、极化曲线和电化学阻抗法测试了L-半胱氨酸对4 mol/L NaOH溶液中AA5052铝合金的缓蚀性能。结果表明：L-半胱氨酸的最佳缓蚀浓度为30 mmol/L；L-半胱氨酸在AA5052铝合金表面的吸附作用符合修正Langmuir曲线；L-半胱氨酸缓蚀剂对AA5052铝合金的缓蚀机理为几何覆盖效应,抑制腐蚀反应的阴极过程,属于阴极型缓蚀剂。
关键词 ： 缓蚀剂,  AA5052铝合金,  L-半胱氨酸,  NaOH溶液    
Abstract：

The corrosion behavior of AA5052 Al-alloy in 4 mol/L NaOH solution was investigated by means of mass loss method, measurements of hydrogen gas evolution,polarization curve and electrochemical impedance spectroscopy. It was found that the inhibitor of 30 mmol/L L-Cysteine exhibited the optimal corrosion inhibition performance. Moreover, the adsorption of the L-Cysteine on the Al-alloy surface obeyed the amended Langmuir's adsorption isotherm. The polarization curves indicated that the L-Cysteine inhibited the cathodic reaction and acted as a cathodic inhibitor. The inhibition mechanism was dominated by the geometric covering effect.
Key words： corrosion inhibitor    AA5052 Al-alloy    L-Cysteine    NaOH solution
    
基金资助:国家自然科学基金项目 (20776083和20911140272) 资助
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王大鹏,高立新,张大全. 碱性溶液中L-半胱氨酸对AA5052铝合金阳极缓蚀作用研究[J]. 中国腐蚀与防护学报, 2015, 35(4): 311-316.
Dapeng WANG, Lixin GAO, Daquan ZHANG. Corrosion Inhibition of L-Cysteine for AA5052 Al-alloy Anode in Alkaline Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(4): 311-316.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.106      或      https://www.jcscp.org/CN/Y2015/V35/I4/311

图1  AA5052铝合金在不同溶液中析氢量随时间的变化关系
图2  AA5052铝合金在不同溶液中失重量随时间的变化关系
图3  AA5052铝合金在不同温度溶液中的C/θ-C曲线
表1  拟合C/θvsC的线性关系所得参数
Temperature ℃ ΔH θ kJmol-1 ΔG θ kJmol-1 ΔS θ J / molK-1
20 -37.2 -19.8 -58.40
30 -42.3 -24.4 -59.76
40 -47.5 -28.9 -59.42
50 -50.2 -31.1 -59.13
表2  L-半胱氨酸缓蚀剂的吸附热力学参数
Solution C mmolL-1 -Ecorr V -βc mVdec-1 Icorr mAcm-2
4 mol/L NaOH 0 1.5607 444.75 70.02
10 1.627 356.96 47.62
20 1.6261 383.64 42.87
30 1.6342 381.7 39.98
40 1.6375 347.51 35.74
表3  AA5052铝合金在含有不同浓度L-半胱氨酸的4 mol/L NaOH溶液中极化曲线拟合值
图4  ln K-T-1曲线
图5  AA5052铝合金在含有不同浓度L-半胱氨酸的4 mol/L NaOH溶液中的极化曲线
图6  AA5052铝合金在含不同浓度L-半胱氨酸的4 mol/L NaOH溶液中的电化学阻抗谱
图7  等效电路图
C mmolL-1 Rs Ωcm2 CPE1 Y0 (Ssncm-2) n (Rct)1 Ωcm2 L1 Hcm2 R1 Ωcm2 CPE2 Y0 (Ssncm-2) n (Rct)2 Ωcm2 L2 Hcm2 R2 Ωcm2
0 0.46 0.18 0.91 0.31 0.006 0.50 4.0×10-4 0.95 0.21 --- ---
10 0.51 0.09 0.94 0.45 0.049 0.55 2.5×10-4 0.87 0.39 3.1×10-3 1.433
20 0.48 0.07 0.88 0.64 0.042 0.58 2.5×10-4 0.91 0.42 2.8×10-3 1.971
30 0.49 0.09 0.91 0.78 0.041 0.64 2.4×10-4 0.84 0.41 2.9×10-3 1.843
40 0.52 0.07 0.82 0.84 0.081 0.72 2.3×10-4 0.92 0.43 3.9×10-3 2.152
表4  AA5052 铝合金在含不同浓度L-半胱氨酸的4 mol/L NaOH溶液中的电化学阻抗拟合值
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