表面技术2016，Vol.45Issue(7)：68-73,6.DOI:10.16490/j.cnki.issn.1001-3660.2016.07.012
4-苯基氨基硫脲在盐酸介质中对Q235钢的缓蚀性能
Inhibition Performance of 4-Phenylthiosemicarbazide for Q235 Steel in HCl Solution
摘要
Abstract
ABSTRACT:Objective To investigate the inhibition performance of 4-Phenylthiosemicarbazide (4-PTC) for Q235 steel in 1 mol/L HCl solution.MethodsA new corrosion inhibitor, 4-PTC, was synthesized using phenyl isothiocyanate and hydrazine hydrate as raw materials. The synthesized compound was confirmed by melting point, 1H-NMR and IR methods. The corrosion inhibition efficiency of 4-PTC was measured by weight loss, potentiodynamic polarization, electrochemical impedance spec- troscopy and scanning electron microscope methods.ResultsThe results of weight loss measurements showed that the inhibi-tion efficiency of 4-PTC could reach up to 85.9% at the concentration of 1.0 mmol/L and the adsorption process obeyed the Langmuir adsorption isotherm, forming monolayer. The value of ΔGads was-35.60 kJ/mol, which indicated that the adsorption mechanism involved both chemisorption and physisorption. The potentiodynamic polarization plots showed that 4-PTC acted as a mixed type inhibitor and showed more pronounced influence in the cathodic polarization plots compared to that in the anodic plots. The inhibition efficiency of 4-PTC could reach up to 83.6% at the concentration of 1.0 mmol/L. Meanwhile, the electro-chemical impedance showed that the charge transfer resistance increased with the increase of the 4-PTC concentration, while the value of double layer capacitance decreased. This phenomenon showed that the corrosion rate decreased and the inhibition effi-ciency increased. The inhibition efficiency of 4-PTC could reach up to 84.7% at the concentration of 1.0 mmol/L. The scanning electron microscope method showed that the 4-PTC had excellent inhibition behavior and could protect the Q235 steel.Conclu-sion4-PTC showed good inhibition efficiency for Q235 steel in HCl solution.关键词
4-苯基氨基硫脲/缓蚀剂/Q235钢/失重法/电化学测试Key words
4-Phenylthiosemicarbazide/corrosion inhibitor/Q235 steel/weight loss/electrochemical test分类
矿业与冶金引用本文复制引用
孟玥,宁文博,徐斌,杨文忠,刘学忠,张凤友..4-苯基氨基硫脲在盐酸介质中对Q235钢的缓蚀性能[J].表面技术,2016,45(7):68-73,6.基金项目
国家水专项基金资助项目（2013ZX07210001）；2015年江苏省大学生创新创业训练计划重点项目（201510291010Z）；国家开发投资公司基金资助项目（DZY150001KYF3）；中国水利水电科学研究院基金资助项目（20154209） FundSupported by National Major Science and Technology Program for Water Pollution Control and Treatment (2013ZX07210001), Jiangsu Students’ Innovation and Entrepreneurship Training Program(201510291010Z), State Development & Investment Corp.(DZY150001KYF3), China Institute of Water Resources and Hydropower Research (20154209) （2013ZX07210001）
