Curcumin was extracted from turmeric using two solvents (ethanol and water), doped with hybrid (TEOS-APTES) sol–gel coatings for the corrosion protection of mild steel. Characterization of curcumin extracts was carried out using integral analyses, namely FTIR, NMR, DSC, TGA, total phenolic content, and antioxidant assay. Corrosion-inhibitive ability of coatings doped with curcumin extracts (25, 50, 75, and 100 ppm) were evaluated via electrochemical impedance spectroscopy and potentiodynamic polarization measurements. It was evident that sol–gel incorporated with 100 ppm ethanol extract provided more than 90% of inhibition efficiency. Coated mild steel surfaces were characterized using FTIR, SEM/EDX, and water contact angle analysis where coatings incorporated with curcumin extracts were found to be hydrophobic (θ = 100.2°).

用两种溶剂（乙醇和水）从姜黄中提取姜黄素，并掺有混合（TEOS-APTES）溶胶-凝胶涂层，以保护低碳钢。姜黄素提取物的表征使用积分分析进行，即FTIR，NMR，DSC，TGA，总酚含量和抗氧化剂分析。姜黄素提取物（25、50、75和100 ppm）掺杂的涂料的腐蚀抑制能力通过电化学阻抗谱和电位极化测量进行评估。很明显，掺有100 ppm乙醇提取物的溶胶凝胶提供了90％以上的抑制效率。使用FTIR，SEM / EDX和水接触角分析对涂层软钢表面进行了表征，发现与姜黄素提取物混合的涂层具有疏水性（θ = 100.2°）。