The addition of corrosion inhibitors has been extensively used as the simplest, most effective and inexpensive technique to inhibit corrosion in industry, and for this reason, this study investigated how 1,1'-Dibenzyl-[4,4'-bipyridine]-1,1'-diium chloride (DBDC) affected Q235 carbon steel's ability to resist corrosion in 1 M HCl. The experimental study was conducted to determine how the compound suppresses corrosion of carbon steel by electrochemical techniques, and the findings demonstrated that DBDC is a powerful corrosion inhibitor that can stop Q235 carbon steel from corroding. Electrochemical impedance spectroscopy (EIS) results indicated that DBDC at a concentration of 400 ppm had a corrosion inhibition efficiency of 95.83% at 298 K ambient temperature. The polarization curves suggested that DBDC could act as a mixed inhibitor and reduce the corrosion current density. The adsorption of compound on Q235 steel surface conformed to Langmuir isothermal adsorption line, and the related thermodynamic parameters were discussed, as well as the influence of the analyzed temperature on efficiency of corrosion inhibition. The surface morphology of Q235 carbon steel was examined under different corrosion inhibitor conditions, the results confirmed that the inhibitor can adsorb on the surface of carbon steel to form a protective film. The role of DBDC molecular structure in the corrosion inhibition process was surveyed by theoretical calculation methods, the results showed that the DBDC molecule could be adsorbed on metal surface by pyridine ring and benzene ring.

添加缓蚀剂已被广泛用作工业中最简单、最有效和廉价的腐蚀抑制技术，因此，本研究调查了 1,1'-二苄基-[4,4'-联吡啶]-1 ,1'-氯化二铵 (DBDC) 影响 Q235 碳钢在 1  M HCl 中的耐腐蚀能力。实验研究旨在通过电化学技术确定该化合物如何抑制碳钢的腐蚀，结果表明 DBDC 是一种强大的腐蚀抑制剂，可以阻止 Q235 碳钢腐蚀。电化学阻抗谱 (EIS) 结果表明，浓度为 400 ppm 的 DBDC 在 298 时的缓蚀效率为 95.83% K 环境温度。极化曲线表明 DBDC 可以作为混合抑制剂并降低腐蚀电流密度。化合物在Q235钢表面的吸附符合Langmuir等温吸附线，讨论了相关的热力学参数，以及分析温度对缓蚀效率的影响。在不同的缓蚀剂条件下对Q235碳钢的表面形貌进行了考察，结果证实缓蚀剂可以吸附在碳钢表面形成保护膜。通过理论计算方法考察了DBDC分子结构在缓蚀过程中的作用，结果表明DBDC分子可以通过吡啶环和苯环吸附在金属表面。