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首页> 外文期刊>Journal of Materials Engineering and Performance >Curcumin Derivatives as Green Corrosion Inhibitors for α-Brass in Nitric Acid Solution
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Curcumin Derivatives as Green Corrosion Inhibitors for α-Brass in Nitric Acid Solution

机译：姜黄素衍生物作为硝酸溶液中α-黄铜的绿色缓蚀剂

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摘要

1,7-Bis-(4-hydroxy-3-methoxy-phenyl)-hepta-1,6-diene-4-arylazo-3,5-dione I-V have been investigated as corrosion inhibitors for α-brass in 2 M nitric acid solution using weight-loss and galvanostatic polarization techniques. The efficiency of the inhibitors increases with the increase in the inhibitor concentration but decreases with a rise in temperature. The conjoint effect of the curcumin derivatives and KSCN has also been studied. The apparent activation energy (E a*) and other thermodynamic parameters for the corrosion process have also been calculated. The galvanostatic polarization data indicated that the inhibitors were of mixed-type, but the cathode is more polarized than the anode. The slopes of the cathodic and anodic Tafel lines (b c and b a) are maintained approximately equal for various inhibitor concentrations. However, the value of the Tafel slopes increases together as inhibitor concentration increases. The adsorption of these compounds on α-brass surface has been found to obey the Frumkin’s adsorption isotherm. The mechanism of inhibition was discussed in the light of the chemical structure of the undertaken inhibitors.
机译：1,7-双-（4-羟基-3-甲氧基-苯基）-庚-1,6-二烯-4-芳基偶氮-3,5-二酮IV已被研究用作2 M硝酸中α-黄铜的腐​​蚀抑制剂酸溶液使用减肥和恒电流极化技术。抑制剂的效率随着抑制剂浓度的增加而增加，但随着温度的升高而降低。还研究了姜黄素衍生物和KSCN的联合作用。还计算了腐蚀过程的表观活化能（E a *）和其他热力学参数。恒电流极化数据表明抑制剂是混合型的，但是阴极比阳极更极化。各种抑制剂浓度下，阴极和阳极Tafel线（b c 和b a ）的斜率保持近似相等。然而，随着抑制剂浓度的增加，Tafel斜率的值一起增加。已经发现这些化合物在α-黄铜表面的吸附符合Frumkin的吸附等温线。根据所采取的抑制剂的化学结构讨论了抑制的机理。

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