Acidic environments pose one of the most significant challenges for metal integrity in industrial settings. The aggressive nature of acids like hydrochloric acid (HCl) can rapidly degrade common materials such as mild steel, leading to costly repairs and operational downtime. At NINGBO INNO PHARMCHEM CO.,LTD., we specialize in developing advanced chemical solutions to combat these challenges, and our work with Cinnamaldehyde Thiosemicarbazone (CT) has yielded exceptional results in acidic corrosion control.

Mild steel is a staple material due to its cost-effectiveness and mechanical properties, but its vulnerability in acidic conditions necessitates robust protection. Cinnamaldehyde Thiosemicarbazone, a Schiff base derivative, has emerged as a powerful corrosion inhibitor. Our extensive research, encompassing both experimental and theoretical approaches, confirms its high efficacy in mitigating the corrosive effects of HCl on mild steel. This research provides a deep understanding of how CT functions at a molecular level to safeguard metal assets.

Through meticulous electrochemical studies, including Potentiodynamic Polarization (PDP), we have determined that CT acts as a mixed-type inhibitor. This means it effectively suppresses both the anodic (metal oxidation) and cathodic (hydrogen evolution) reactions that drive corrosion. The shift in corrosion potential (Ecorr) towards more negative values, observed with increasing CT concentration, indicates a stronger cathodic protection mechanism. This is further corroborated by the reduction in both anodic and cathodic Tafel slopes, demonstrating the inhibitor's ability to block active sites on the metal surface.

Furthermore, Electrochemical Impedance Spectroscopy (EIS) studies have revealed that CT significantly increases the charge transfer resistance (Rct) at the metal-electrolyte interface. This increase is directly related to the formation of a protective barrier film by the adsorbed CT molecules. The larger diameter of the Nyquist semicircle plots at higher CT concentrations signifies enhanced corrosion resistance. These findings underscore the physical and chemical adsorption processes that lead to a stable, insulating layer on the mild steel surface.

Complementing these experimental results, theoretical analyses using Density Functional Theory (DFT) provide a molecular perspective on CT's effectiveness. Calculations of frontier molecular orbitals (HOMO and LUMO) and Mulliken charges reveal that CT possesses favorable electronic properties for adsorption. Its molecular structure facilitates strong interactions with the mild steel surface, leading to efficient surface coverage and robust corrosion inhibition. The low HOMO-LUMO energy gap suggests a high capacity for electron donation, crucial for forming protective bonds with the metal.

NINGBO INNO PHARMCHEM CO.,LTD. is proud to offer Cinnamaldehyde Thiosemicarbazone as a leading solution for demanding acidic corrosion control applications. Our commitment to scientific rigor ensures that our products are not only effective but also well-understood, providing our clients with the confidence to protect their valuable assets. For industries battling the detrimental effects of acids, CT represents a superior choice for maintaining the integrity and longevity of mild steel components.