New Azo Schiff compound namely 4-((4-hydroxy-3-((pyridine-2-ylimino)methyl)phenyl)diazenyl)benzonitrile (5) which is denoted as AS was synthesized and characterized using FT-IR, ¹³C NMR and ¹H NMR spectroscopy. The new compound was evaluated as corrosion inhibitor for carbon steel in 1 M H₂SO₄, using electrochemical and gravimetric techniques. Tween-80 surfactant was added to enhance the solubility of AS in the acidic medium. The inhibition efficiency was found to be dependent on the concentration of AS and temperature, the highest inhibition efficiency values (91.32% and 90.30% by potentiodynamic and weight loss measurements respectively) were recorded in the presence of relatively low concentration of AS (0.08 mM) at 303 K, and it acts as anodic inhibitor. To understand the mechanism of the corrosion inhibition, the adsorption of AS onto carbon steel surface was studied, the results indicated that the adsorption process obeys Langmuir adsorption isotherm, the calculated ΔG_ads values were found to be around −37 kJ mol⁻¹ which indicates that AS is adsorbed on the carbon steel surface by chemical and physical interactions. For further investigations DFT studies were employed to explain the nature of interaction between the AS molecules (neutral and protonated) and metal surface. Finally, the morphology of both corroded and inhibited surfaces were studies by scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques which confirmed the high inhibition efficiency of AS at the optimum conditions, a significant reduction in the distortion and roughness of the surface were observed (the surface roughness was reduced from 17.10 nm to 2.15 nm as measured by AFM).

新偶氮希夫化合物即4 - （（4-羟基-3 - （（吡啶-2-基亚氨基）甲基）苯基）二氮烯基）苄腈（5），其被表示为AS的合成和表征使用FT-IR，¹³ C NMR和¹ H NMR光谱。使用电化学和重量分析技术，将该新化合物评估为1 MH ₂ SO _4中的碳钢腐蚀抑制剂。加入Tween-80表面活性剂以增强AS在酸性介质中的溶解度。发现抑制效率取决于AS的浓度在温度和温度下，在303 K下存在相对较低浓度的AS（0.08 mM）的情况下，记录到最高的抑制效率值（分别通过电位动力学和重量损失测量分别为91.32％和90.30％），并且它起着阳极抑制剂的作用。为了理解腐蚀抑制的机理，吸附AS到碳素钢表面进行了研究，结果表明，吸附过程服从Langmuir吸附等温，计算出的Δ ģ_广告发现值是大约-37千焦耳摩尔^-1其中表示AS通过化学和物理相互作用吸附在碳钢表面上。为了进一步研究，采用DFT研究来解释AS分子（中性和质子化）与金属表面之间相互作用的性质。最后，通过扫描电子显微镜（SEM）和原子力显微镜（AFM）技术研究了腐蚀表面和抑制表面的形态，这些技术证实了在最佳条件下AS的高抑制效率，显着降低了合金的变形和粗糙度。观察到表面（通过AFM测量，表面粗糙度从17.10nm降低至2.15nm）。