菟丝子提取物与碘化钾对冷轧钢在盐酸中的缓蚀协同效应  

Synergistic Inhibition Effect of Cuscuta Chinensis Lam Extract and Potassium Iodide on Cold Rolled Steel in Hydrochloric Acid

作　　者：吴浩 邓书端 李向红 WU Hao;DENG Shuduan;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;Faculty of Materials Science and 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 [2]西南林业大学材料科学与工程学院,昆明650224

出　　处：《中国腐蚀与防护学报》2023年第1期77-86,共10页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(52161016);云南省基础研究计划杰出青年项目(202001AV070008);云南省万人计划青年拔尖人才专项(51900109);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开放基金(2021-KF10)。

摘　　要：以寄生植物菟丝子(CCL)为原料,通过回流提取法从中提取制备出菟丝子提取物(CCLE),通过失重法、动电位极化曲线和电化学阻抗谱(EIS)测定CCLE和碘化钾(KI)复配后对冷轧钢在1.0 mol/L HCl溶液中的缓蚀协同效应。结果表明,CCLE对冷轧钢在HCl中有较好的缓蚀作用,最大缓蚀率为84.0%;其与KI复配后,最大缓释率可进一步提升到90.8%。缓蚀协同效应系数在各复配浓度和温度下均大于1。CCLE和CCLE/KI在冷轧钢表面均符合Langmuir吸附等温式,复配后的吸附平衡常数和标准吸附Gibbs自由能(ΔG0)绝对值进一步增大。CCLE和CCLE/KI复配均属于混合抑制型缓蚀剂,但复配后对阴阳两极的抑制作用进一步增强。Nyquist图谱呈现单一半圆容抗弧,CCLE和KI复配后,电荷转移电阻明显增大。扫描电子显微镜(SEM)和原子力显微镜(AFM)表面形貌观察也表明,CCLE和KI复配后有效抑制了HCl对冷轧钢表面的腐蚀,两者存在缓蚀协同效应。Cuscuta chinensis Lam extract(CCLE)was obtained from the dodder,which is a kind of parasitic plant,by circulation reflux method.The synergistic inhibition effect of CCLE and KI on cold rolled steel in 1.0 mol/L HCl solution was studied by mass loss method,potentiodynamic polarization curve measurement and electrochemical impedance spectroscope,as well as electron microscope(SEM)and atomic force microscope(AFM).The results showed that CCLE acts as an efficient inhibitor for cold rolled steel in HCl solution,and the maximum inhibition efficiency is 84.0%.The inhibition can be further increased to 90.8%for the combination of CCLE with KI.All the synergism parameters are higher than unity for the design of various compound concentrations and test temperatures.The adsorption of CCLE and CCLE/KI obey Langmuir isotherm.When CCLE is incorporated with KI,both of the adsorption equilibrium constant(K)and the absolute value of standard adsorption free energy(ΔG0)becomes larger.CCLE and CCLE/KI can be arranged as mixed-type inhibitors,and the inhibition coefficient is strengthened after combination.There exists a single capacitive loop in the Nyqusit diagram.The charge transfer resistance turns to be much higher for the combination of CCLE with KI.SEM and AFM observation result also proves that the combination of CCLE and KI presents a significantly synergistic inhibition effect on the surface of cold rolled steel in HCl solution.

关 键 词：缓蚀剂 缓蚀协同效应 冷轧钢 菟丝子 碘化钾 盐酸 

分 类 号：TG174[金属学及工艺—金属表面处理]