Inhibitive Efficiency of some Substituted Thioureas for the Corrosion of Aluminium in Nitric Acid
Inhibitive Efficiency of some Substituted Thioureas for the Corrosion of Aluminium in Nitric Acid
复制标题
DOI：
10.1179/000705979798358571
复制
发表时间：
1979-01
期刊：
影响因子：
--
通讯作者：
D. D. Singh-D.;R. Chaudhary;B. Prakash;C. Agarwal
中科院分区：
文献类型：
--
作者：
D. D. Singh-D.;R. Chaudhary;B. Prakash;C. Agarwal
研究了硫脲及其衍生物在25°C、35°C和45°C下对1060铝在硝酸中的缓蚀效果。在25°C、20%HNO_3中，对氯苯基硫脲>间氯苯基硫脲≥邻氯苯基硫脲≥苯基脲> 1：3二苯基硫脲≥ 1：3二对氯苯基硫脲。≥ 1：3二间氯苯基硫脲>硫脲。吸附的化合物是符合Langmuir的吸附等温线方程t的浓度为250 ppm，在所有三个温度下研究。从25° C到45°C，缓蚀剂的百分效率随温度的升高而增加。缓蚀剂的相对效率与它们的临界电流密度或一次钝化电位无关。所有的抑制剂被发现主要作用于局部阴极，虽然部分有效的阳极。
The inhibitive efficiencies of thiourea and some of its derivatives have been studied in relation to the corrosion of aluminium (Grade 1060) in nitric acid at 25°c, 35°c and 45°c. The efficiency in 20% HNO3 at 25°c decreases in the order: p-chlorophenyl thiourea > m-chlorophenyl thiourea ≥ o-chlorophenyl thiourea ≥ phenyl urea > 1:3 di-phenyl thiourea ≥ 1:3 di-p-chlorophenyl thiourea. ≥ 1:3 di-m-chlorophenyl thiourea > thiourea. The adsorption of the compounds is in agreement with Langmuir's adsorption isotherm equation up t a concentration of 250 ppm, at all the three temperatures studied. The percentage efficiencies of the inhibitors were found to increase with increase in temperature from 25° to 45°c. There is no relation between the relative efficiencies of the inhibitors and their critical current densities or primary passivation potentials. All the inhibitors were found to act predominantly on local cathodes although partially effective on the anodes.