Exploring the anticorrosion properties of wastewater from a winemaking process for the protection of carbon steel in acid environments

This study investigates the potential conversion and application of the wastewater from a winemaking industry for the corrosion protection of metallic materials. Grain-soaked wastewater extract (herein called SOW) was collected from the leached grain wastewater of Sichuan-style Xiaoqu Baijiu. The elemental analysis results indicated that SOW was an oxygen rich compound containing N and S heteroatoms, and Fourier transform infrared spectroscopy also confirmed that SOW was rich in multiple functional groups. The effect of SOW on the corrosion suppression of Q235B carbon steel in 0.5 M H₂SO₄ solution was investigated through electrochemical measurements, weight loss experiments and surface analysis technology. The results revealed that SOW was an excellent anticorrosion material for Q235B carbon steel, especially after the combination of SOW and potassium iodide (KI), the corrosion inhibition efficiency was up to 94.07% at 30 °C. Surface analysis further demonstrated the corrosion inhibition effect of SOW on Q235B carbon steel in H₂SO₄ solution. Moreover, the thermodynamic and kinetic parameters were calculated to reveal the corrosion inhibition mechanism of SOW. Wastewater from a grain-soaked process (SOW) was collected and characterizedThe anticorrosion properties of SOW were explored at varying concentration and temperature.SOW is a hybrid corrosion inhibitor with dominant cathodic effectsThe efficacy of SOW was improved by the synergistic action of KIThe adsorption properties of SOW were confirmed by FTIR, AFM and 3D microscopy Wastewater from a grain-soaked process (SOW) was collected and characterized The anticorrosion properties of SOW were explored at varying concentration and temperature. SOW is a hybrid corrosion inhibitor with dominant cathodic effects The efficacy of SOW was improved by the synergistic action of KI The adsorption properties of SOW were confirmed by FTIR, AFM and 3D microscopy

本研究探究了酿酒工业废水在金属材料腐蚀防护中的转化潜力及应用。浸粮废水提取物（以下简称SOW）取自川派小曲白酒的浸粮淋溶废水。元素分析结果表明，SOW是富含氧的化合物，且含有氮、硫杂原子；傅里叶变换红外光谱（FTIR）也证实，SOW富含多种官能团。通过电化学测试、失重实验及表面分析技术，研究了SOW对Q235B碳钢在0.5 mol/L硫酸溶液中的缓蚀效果。结果显示，SOW是Q235B碳钢的优秀防腐材料；尤其是当SOW与碘化钾（KI）复配后，在30℃下的缓蚀效率可达94.07%。表面分析进一步证实了SOW在硫酸溶液中对Q235B碳钢的缓蚀作用。此外，通过计算热力学及动力学参数，揭示了SOW的缓蚀机理。收集并表征了浸粮工艺废水（SOW）；探究了不同浓度及温度下SOW的防腐性能；SOW是具有阴极主导效应的混合型缓蚀剂；KI的协同作用提升了SOW的缓蚀效能；通过FTIR、原子力显微镜（AFM）及三维显微镜证实了SOW的吸附性能。收集并表征了浸粮工艺废水（SOW）；探究了不同浓度及温度下SOW的防腐性能；SOW是具有阴极主导效应的混合型缓蚀剂；KI的协同作用提升了SOW的缓蚀效能；通过FTIR、原子力显微镜（AFM）及三维显微镜证实了SOW的吸附性能。