核桃青皮提取物与Nd(NO_(3))_(3)对Al在HCl溶液中的缓蚀协同效应  

Synergistic Inhibition Effect of Walnut Green Husk Extract and Nd(NO_(3))_(3)on Aluminum in HCl Solution

作　　者：黄苗 王丽姿 马晓青 李向红 HUANG Miao;WANG Lizi;MA Xiaoqing;LI Xianghong(Key Laboratory of State Forestry and Grassland Administration on Highly-Efficient Utilization of Forestry Biomass Resources in Southwest China,College of Chemical Engineering,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]西南林业大学化学工程学院、西南地区林业生物质资源高效利用国家林业和草原局重点实验室,昆明650224

出　　处：《中国腐蚀与防护学报》2023年第3期471-480,共10页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(52161016,51761036);云南省基础研究计划(202001AV070008);云南省万人计划青年拔尖人才专项(51900109);国家级大学生创新创业训练计划。

摘　　要：采用失重法、极化曲线、电化学阻抗谱(EIS)、扫描电子显微镜(SEM)和原子力显微镜(AFM)研究核桃青皮提取物(WGHE)和稀土盐Nd(NO_(3))_(3)复配缓蚀剂对Al在HCl溶液中的缓蚀协同效应及作用机理。结果表明:由失重法测试得出WGHE与Nd(NO_(3))_(3)在对Al在1.0 mol/L HCl介质的腐蚀具有中等程度的缓蚀效率,25 ℃时最大缓蚀率分别为67.8%和79.1%,将二者复配使用后产生缓蚀协同效应,40 ℃时0.5 g/L WGHE和1.0 g/L Nd(NO_(3))_(3)的缓蚀率高达90.4%。WGHE和Nd(NO_(3))_(3)复配前后均在铝表面吸附形成缓蚀保护膜,并且吸附规律符合Langmuir吸附等温式。WGHE与Nd(NO_(3))_(3)复配后更能有效抑制阴极反应。Nyquist图谱近似呈“椭圆”特征,WGHE与Nd(NO_(3))_(3)复配后电荷转移电阻和极化电阻进一步增大,而常相位角元件参数下降。SEM和AFM的表征结果表明,铝表面在WGHE/Nd(NO_(3))_(3)的复配协同体系中的腐蚀反应减缓和铝表面平整度显著提高。WGHE中的缓蚀有效成分主要为萘醌类和黄酮类化合物。The synergistic effect of walnut green husk extract(WGHE)and rare earth salt Nd(NO_(3))_(3)on the corrosion inhibition of Al plate in HCl solution was investigated by mass loss method,polarization curve measurement,electrochemical impedance spectroscopy(EIS),scanning electron microscope(SEM)and atomic force microscope(AFM).The mass loss results indicate that the individual WGHE or Nd(NO_(3))_(3)has moderate corrosion inhibition efficiency,and the maximum corrosion inhibition rate at 25℃is 67.8%and 79.1%,respectively.The synergistic corrosion inhibition will be produced after the two are used in combination,namely the inhibition efficiency at 40℃is as high as 90.4%for the combination of 0.5 g/L WGHE and 1.0 g/L Nd(NO_(3))_(3).Both WGHE and Nd(NO_(3))_(3)were adsorbed on the Al surface to form a protective film before and after the compounding,and the adsorption conformed to Langmuir adsorption isotherm.The compound of WGHE and Nd(NO_(3))_(3)can more effectively inhibit the cathodic reaction.The Nyquist plot is approximately"elliptical".After WGHE is combined with Nd(NO_(3))_(3),the charge transfer resistance and polarization resistance of the inhibition film on Al further increase,while the constant phase angle component parameters decrease.SEM and AFM characterization results show that the corrosion reaction of the Al surface in the system slows down and the flatness of the Al surface is significantly improved.The major effective components of WGHE mainly are naphthoquinones and flavonoids.

关 键 词：缓蚀剂 缓蚀协同效应 吸附 AL 核桃青皮 稀土 盐酸 

分 类 号：TG174[金属学及工艺—金属表面处理]