材料期刊网

目的研究对苯二酚对碳钢在1 mol/L盐酸溶液中的腐蚀抑制行为。方法通过失重法、电化学法(交流阻抗和动电位极化)、扫描电镜分析对苯二酚与KI复配后的缓蚀效率、机理以及金属表面腐蚀形貌。结果失重实验表明,在25℃,单独使用对苯二酚时的缓蚀效率达36.2%；当与0.01 mol/L KI复配后,随着对苯二酚用量的增加,缓蚀效率增大,最大可达81.4%。对苯二酚在碳钢表面的吸附符合朗缪尔吸附等温式,以物理吸附为主。动电位极化曲线研究表明,对苯二酚是一种阳极作用型缓蚀剂。交流阻抗谱研究表明,盐酸溶液中存在该复配缓蚀剂时,碳钢的电荷转移电阻随对苯二酚用量的增大而增大。 SEM分析表明,对苯二酚与KI复配可有效减弱盐酸对C38碳钢表面的侵蚀。结论对苯二酚与KI复配是有效的酸洗缓蚀剂。

ABSTRACT:Objective To investigate the corrosion inhibition behavior of Hydroquinone( HQ) on carbon steel in 1 mol/L HCl solution. Methods Weight-loss method, electrochemical impedance spectroscopy ( EIS ) and potentiodynamic polarization tech-niques and scanning electron microscope ( SEM) observation were used to analyze the inhibition efficiency, mechanism and corro-sion appearance on steel surface when HQ was mixed with KI. Results Weight-loss results obtained indicated that the highest inhi-bition efficiency of Hydroquinone was only 36. 2% when was used alone; while the inhibition efficiency increased with Hydroqui-none concentrations when KI coexisted in hydrochloric acid solution and the highest inhibition efficiency could reach 81. 4% at 25℃. In addition, it was found that the adsorption of Hydroquinone on carbon steel obeyed the Langmuir adsorption isotherm and showed the adsorption in favor of physisorption mechanism. Potentiodynamic polarization data indicated that the inhibitor was a type of anodic effectiveness. The EIS indicated charge transfer resistance increased with HQ concentration at certain concentration of KI in HCl solution. Scanning electron microscopy observation showed HQ+KI had an obvious protective effect on metal corrosion. Conclusion Hydroquinone was an effective pickling inhibitor for C38 steel with KI.