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首页> 外文期刊>International Journal of Electrochemical Science >Inhibition of Corrosion of Brass in 0.1 M H2SO4 by Thioxoprymidinone Derivatives
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Inhibition of Corrosion of Brass in 0.1 M H2SO4 by Thioxoprymidinone Derivatives

机译：硫氧嘧啶酮衍生物对黄铜在0.1 M H 2 SO 4 中的腐蚀抑制作用

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摘要

The inhibitive efficiency of 6-methyl-2-thioxopyrimidinone (MTP), 6-phenyl-2- thioxopyrimidin-4- one (PhTP) and 5-cyano-6-phenyl-2-thioxopyrimidin-4-one (CPhTP) for brass corrosion in 0.1 M0 H2SO4 at 30 C were investigated by potentiodynamic polarization and electrochemical impedancespectroscopy (EIS) techniques. These compounds inhibit the corrosion of brass even at very lowconcentrations and the order of increasing the inhibition efficiency was correlated with themodification of the molecular structure of the inhibitors. The anodic polarization curves of brass in 0.1M H2SO4 in presence of higher concentrations of PhTP showed a passivity and limiting current+ behavior indicating the formation of [Cu(PhTP)] sparingly soluble complex. Theoretical fitting of thekinetic-thermodynamic model of the adsorption of inhibitors at the metal surface are tested to clarifythe nature of adsorption. Calculation of the activation parameters of the corrosion reaction of copper inabsence and presence of the inhibitors indicated that the presence of the cyano group in CPhTPcompound favors chemical adsorption of the inhibitor at the metal suface.
机译：6-甲基-2-噻吩并嘧啶酮（MTP），6-苯基-2-噻吩并嘧啶-4-酮（PhTP）和5-氰基-6-苯基-2-噻吩并嘧啶酮4-one（CPhTP）的抑制效率通过电位动力学极化和电化学阻抗谱（EIS）技术研究了在30 M下0.1 M0 H2SO4中的腐蚀。这些化合物即使在很低的浓度下也能抑制黄铜的腐蚀，并且增加抑制效率的顺序与抑制剂分子结构的改变有关。在较高浓度的PhTP存在下，黄铜在0.1M H2SO4中的阳极极化曲线显示出钝性和极限电流+行为，表明形成了[Cu（PhTP）]难溶的络合物。测试抑制剂在金属表面吸附的动力学-热力学模型的理论拟合，以阐明吸附的性质。铜的不存在和抑制剂的腐蚀反应的活化参数的计算表明，CPhTP化合物中氰基的存在有利于抑制剂在金属表面的化学吸附。

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