在酸性介质中脐橙皮提取物对不锈钢的缓蚀作用  

Corrosion Inhibition of Navel Orange Peel Extract to Stainless Steel in Acidic Medium

作　　者：周坤[1] 柳鑫华 刘帅 ZHOU Kun;LIU Xinhua;LIU Shuai(Hebei Chemical&Pharmaceutical College,Shijiazhuang 050026,China;Department of Chemistry,Tangshan Normal University,Tangshan 063000,China)

机构地区：[1]河北化工医药职业技术学院,石家庄050026 [2]唐山师范学院化学系,唐山063000

出　　处：《中国腐蚀与防护学报》2023年第3期619-629,共11页Journal of Chinese Society For Corrosion and Protection

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

摘　　要：选用脐橙皮提取物(NOPE)作为HCl环境中316L钢的缓蚀剂。通过简单的乙醇-丙酮回流法提取获得NOPE。通过红外光谱和紫外光谱验证了脐橙皮提取物的主要成分及其在盐酸中的稳定性。采用失重法、动态电位极化法、线性极化和电化学阻抗谱法研究了NOPE在0.5 mol/L HCl溶液中对316L钢的缓蚀性能。通过ΔG_(ads)^(0)、ΔH_(ads)^(0)和ΔS_(ads)^(0)对它们的吸附性能进行了计算。结果表明,随着NOPE浓度的增加,腐蚀速率的降低,阳极电流的减少和活性腐蚀部位的阻断,使缓蚀效率提高。当NOPE的加入量为0.5 g/L时,体系的缓蚀效率最高为90.5%(失重法)和87.3%(电化学法)。与空白体系相比,添加NOPE后,体系的热力学活化参数(活化能)E_(a)明显增大,(E_(a)-ΔH_(a)^(0))的差值约等于RT的平均值(2.64 kJ/mol),因此,可以推断,腐蚀过程为单分子反应。采用Langmuir等温线拟合金属表面的吸附过程,进一步证明了该吸附为单分子层吸附。通过扫描电镜和能谱分析证明了NOPE在钢表面的作用降低了316L钢的酸腐蚀。在0.5 mol/L HCl溶液体系中,NOPE对L316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的指导。To promote the rapid development of green plant extract inhibitor,navel orange peel extract(NOPE)was obtained by a simple ethanol-acetone reflux method,which then was assessed as inhibitor for 316L steel in hydrochloric acid medium.The main components of navel orange peel extract(NOPE)and its stability in hydrochloric acid were confirmed by infrared spectroscopy(FTIR)and ultraviolet spectroscopy(UV).The corrosion inhibition performance of NOPE to 316L steel in 0.5 mol/L HCl solution was investigated using mass loss method,dynamic potential polarization method(PDP),linear polarization method(LPR)and electrochemical impedance spectroscopy(EIS).Their adsorption properties were calculated with items ofG_(ads)^(0)s,ΔH_(ads)^(0)andΔS_(ads)^(0).The results show that with the increase of the concentration of NOPE,the steel corrosion rate is reduced,the anode current is reduced and the active corrosion site is blocked,so the inhibition efficiency is improved.When the concentration of NOPE was 0.5 g/L,the maximum corrosion inhibition efficiency was 90.5%(masslessness method)and 87.3%(electrochemical method)respectively.Compared with the blank system,the thermodynamic activation parameter(activation energy)E_(a)significantly increased in the system with NOPE,and the difference of(E_(a)-ΔH_(a)^(0))was about equal to the average value of RT(2.64 kJ/mol).Therefore,it can be inferred that the corrosion process was a single molecule reaction.The adsorption process on the steel surface was fitted by Langmuir isotherm,which further proved that the adsorption was monolayer adsorption.The better corrosion inhibition performance of NOPE for L316 steel in 0.5 mol/L HCl solution system can also be proved by the observation and detection with scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).In sum,the NOPE is a green inhibitor with a good application prospect in the field of pickling and can provide certain guidance for the development of plant extract inhibitor.

关 键 词：脐橙皮提取物 缓蚀剂 极化 阻抗 表面分析 

分 类 号：TG174[金属学及工艺—金属表面处理]