目的 推进绿色植物提取物类缓蚀剂的快速发展，选用橙子皮提取物(NOPE)作为磷酸环境中Q235钢的缓蚀剂。方法 通过简单的乙醇、丙酮回流法提取获得NOPE。通过红外光谱(FTIR)和紫外光谱(UV)验证NOPE的主要结构及主要成分在磷酸中的稳定性。采用失重法、动态电位极化法(PDP)、线性极化(LPR)和电化学阻抗谱法(EIS)研究NOPE在0.5 mol/L的H3PO4溶液中对Q235钢的缓蚀性能。通过计算研究温度对热力学参数(Ea、 、 )和吸附性能参数( 、 、 )的影响。结果NOPE明显减缓了0.5 mol/L H3PO4介质中Q235钢的腐蚀速率，属于以抑制阳极金属溶解为主的混合型缓蚀剂。随着NOPE浓度的增大，阳极电流密度减小和活性腐蚀部位被阻断，腐蚀速率降低，缓蚀效率增大。在温度为303 K、NOPE质量浓度为3.0 g/L条件下，对Q235钢缓蚀效率都在90%以上。此外，NOPE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。通过扫描电镜(SEM)、能谱分析(EDS)和接触角的测量证明了NOPE在钢表面的缓蚀作用的存在，降低了Q235钢的酸腐蚀速率。量子化学研究证实，NOPE对碳钢较好的缓蚀和吸附性能是由于橙皮苷和黄酮的官能团。结论 在0.5 mol/L的H3PO4溶液体系中，NOPE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，可以为植物提取类的缓蚀剂的发展提供一定的指导。

In order to promote the rapid development of green plant extract as corrosion inhibitors, orange peel extract (NOPE) was used as corrosion inhibitor to Q235 steel in phosphoric acid environment. Orange peel extract (NOPE) was obtained by simple reflux extraction using anhydrous ethanol and acetone. The main groups of orange peel extract (NOPE) and stability of main ingredients in phosphoric acid were confirmed by an infrared spectroscopy (FTIR) and an ultraviolet spectroscopy (UV). The corrosion inhibition performance of orange peel extract (NOPE) to Q235 steel in 0.5 mol/L H3PO4 solution was investigated by weight loss, dynamic potential polarization (PDP), linear polarization (LPR) and electrochemical impedance spectroscopy (EIS). The influence of temperature on thermodynamic parameters (Ea,ΔHaΘ and ΔSaΘ) and adsorption properties (ΔGΘads, ΔHΘads and ΔSΘads) was studied by calculation. The corrosion rate of Q235 steel was significantly slowed down in 0.5 mol/L H3PO4 medium system with orange peel extract (NOPE) and NOPE belonged to the mixed corrosion inhibitor mainly to inhibit the dissolution of anode metal. With the concentration increase of orange peel extract (NOPE), the anode current was reduced and the active corrosion site was blocked, the corrosion rate was reduced and the inhibition efficiency was increased. The corrosion inhibition efficiency of Q235 steel was above 90% at the temperature of 303 K and the concentration of 3.0 g/L orange peel extract (NOPE) using different test methods such as weight loss, PDP, LPR and EIS. The corrosion inhibition efficiency of Q235 steel was reduced with the increase of system temperature. The thermodynamic activation parameter (activation energy) Ea of the system with orange peel extract (NOPE) was significantly increased compared with the blank system, and the difference of (Ea－ΔHaΘ) was equal to the mean value of RT (2.64 kJ/mol) at per concentration, so it could be inferred that the corrosion process was a monomolecar reaction. Moreover, the adsorption of the active component of orange peel extract (NOPE) on the surface of Q235 steel was in accordance with Langmuir isotherm and physical adsorption was dominant, which further proved that the adsorption was monolayer adsorption. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and contact angle measurement all proved the existence of corrosion inhibition on the steel surface and reduced the acid corrosion rate of Q235 steel. Quantum chemical studies confirmed that the better corrosion inhibition and adsorption performance of NOPE on Q235 steel was due to the functional groups of hesperidin and flavone. The orange peel extract (NOPE) has good corrosion inhibition performance to Q235 steel in the 0.5 mol/L H3PO4 solution system. It is a green corrosion inhibitor with good application prospect in the pickling field, and can provide certain guidance for the development of plant extract corrosion inhibitor.