菠菜提取物在柠檬酸体系中对Q235钢的缓蚀性能  

Inhibitory Performance of Spinach Extract on the Corrosion of Q235 Steel in a Citric Acid System

作　　者：柳鑫华 王赢 罗宝晶 张源 李繁麟 刘会媛[1] 胡海凤 舒世立[1] 张青[1] 王磊[1] 刘斯瑜 古林艳 张国炜 LIU Xinhua;WANG Ying;LUO Baojing;ZHANG Yuan;LI Fanlin;LIU Huiyuan;HU Haifeng;SHU Shili;ZHANG Qing;WANG Lei;LIU Siyu;GU Linyan;ZHANG Guowei(Department of Chemistry,Tangshan Normal University,Tangshan 063000,China)

机构地区：[1]唐山师范学院化学系,河北唐山063000

出　　处：《材料保护》2023年第12期65-78,共14页Materials Protection

基　　金：河北省自然科学基金(D2022105004);唐山师范学院基金项目(2022C42)资助。

摘　　要：为契合绿色植物提取物类缓蚀剂的快速发展,选用菠菜提取物(SPE)作为柠檬酸(CA)环境中对Q235钢的缓蚀剂。通过简单的乙醇回流法提取获得SPE,通过傅立叶变换红外光谱(FTIR)和紫外⁃可见光谱(UV⁃Vis)验证了SPE的主要成分及主要成分在CA中的稳定性,采用失重法、动态电位极化(PDP)、线性极化(LPR)、电化学阻抗谱(EIS)、扫描电镜(SEM)、能谱分析(EDS)和接触角测试等方法研究了SPE在0.5 mol/L CA溶液中对Q235钢的缓蚀性能。通过计算研究了温度对活化参数Ea、ΔH_(a)^(0)和ΔS_(a)^(0)和吸附性能参数ΔG_(a)^(0)ds、ΔH_(a)^(0)ds和ΔS_(a)^(0)ds的影响。结果表明:SPE的主要成分为叶绿素,SPE在0.5 mol/L CA溶液中具有较好的稳定性。SPE明显减缓了0.5 mol/L CA溶液中Q235钢的腐蚀速率,属于抑制阴、阳极的混合型缓蚀剂。随SPE浓度的增大,阴、阳极电流减少,活性腐蚀部位被阻断,腐蚀速率降低,缓蚀效率增大。在温度303 K、SPE浓度2.134 g/L的条件下,根据失重法、PDP、LPR和EIS计算出的缓蚀效率均在80%以上。随体系温度的升高SPE对Q235钢的缓蚀效率降低,但变化较小。与空白体系相比,添加SPE后体系的活化能Ea明显增大。SPE的有效成分在Q235钢表面的吸附符合Langmuir等温式,且以物理吸附为主,属于单分子层的吸附。在0.5 mol/L CA溶液体系中,SPE对Q235钢具有较好的缓蚀性能,是一种在酸洗领域中有着较好应用前景的绿色缓蚀剂,可以为植物提取类缓蚀剂的发展提供一定参考。In order to adapt to the rapid development of green plant extract corrosion inhibitors,spinach extract(SPE)was selected as a corro⁃sion inhibitor for Q235 steel in citric acid(CA)environment.SPE was extracted using a simple ethanol reflux method,and its main compo⁃nents,as well as their stability in CA,were confirmed through Fourier transform infrared spectroscopy(FTIR)and ultraviolet⁃visible spectros⁃copy(UV⁃Vis).The corrosion inhibition performance of SPE on Q235 steel in 0.5 mol/L CA solution was investigated using various methods including weight loss,dynamic potential polarization(PDP),linear polarization resistance(LPR),electrochemical impedance spectroscopy(EIS),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and contact angle measurements.Effects of temperature on the activation parameters(Ea,ΔH_(a)^(0),andΔS_(a)^(0))and adsorption properties(ΔG_(a)^(0)ds,ΔH_(a)^(0)ds,andΔS_(a)^(0)ds)were studied by calculation.Results showed that chlorophyll was the main component of SPE,which exhibited good stability in a 0.5 mol/L CA solution.Furthermore,SPE signifi⁃cantly reduced the corrosion rate of Q235 steel in the 0.5 mol/L CA medium,acting as a mixed corrosion inhibitor for both cathodic and anodic reactions.With the increase of SPE concentration,both cathodic and anodic currents were reduced,active corrosion sites were blocked,the corrosion rate was decreased,and the corrosion inhibition efficiency was enhanced.The corrosion inhibition efficiency of Q235 steel obtained by weight loss method,PDP,LPR and EIS was more than 80%with 2.134 g/L of SPE concentration at 303 K.With the increase of system tem⁃perature,the corrosion inhibition efficiency of SPE on Q235 steel decreased,but the change was smaller.Compared to the blank system,the activation energy(Ea)of the system significantly increased after the addition of SPE.The effective components of SPE adsorped to the surface of Q235 steel in accordance with the Langmuir isotherm,predominantly through physical adsorption,and we

关 键 词：菠菜提取物 叶绿素 缓蚀剂 Langmuir单层吸附 电化学测试 

分 类 号：TG174.42[金属学及工艺—金属表面处理]