磷酸中核桃青皮复配缓蚀剂对冷轧钢的缓蚀协同效应  

Synergistic Inhibition Effect of Walnut Green Husk Extract Complex Inhibitors on Steel in Phosphoric Acid

作　　者：李向红 徐昕 雷然 邓书端 LI Xianghong;XU Xin;LEI Ran;DENG Shuduan(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,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》2022年第3期358-368,共11页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51761036);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)。

摘　　要：采用失重法、电化学法及表面分析测试研究了农林废弃物核桃青皮提取物(WGHE)与阴离子表面活性剂十二烷基磺酸钠(SLS)对冷轧钢在2.0 mol/L H_(3)PO_(4)介质中的缓蚀协同效应,并对WGHE中的缓蚀有效成分进行了探究。结果表明:单独的WGHE、SLS具有中等程度的缓蚀性能,50℃时100 mg/L的缓蚀率仅为50%左右;WGHE/SLS复配后缓蚀率不断上升,最高缓蚀率可达95.3%,两者之间存在显著的缓蚀协同效应,缓蚀协同效应系数随温度的升高而增大。WGHE/SLS复配缓蚀剂更能同时有效抑制阴极和阳极反应;Nyquist图谱呈现单一弥散容抗弧,电荷转移电阻排序为:WGHE/SLS>WGHE>SLS。WGHE中主成分芦丁、槲皮素、1-甲基萘醌与SLS之间存在缓蚀协同作用,但协同性能低于WGHE/SLS复配缓蚀剂。The synergistic inhibition effect of forestry and agricultural residue of walnut green husk extract(WGHE) and the anionic surfactant of SLS on the corrosion of cold rolled steel(CRS) in 2.0 mol/L H_(3)PO_(4)solution was studied by mass loss measurement, electrochemical technique and surface analysis methods. The results show that individual WGHE or SLS exhibits moderate inhibition capacity with the maximum inhibition efficiency of c.a. 50% for a dosage of 100 mg/L at 50 ℃. However, incorporation of WGHE with SLS can obtain better inhibitive performance, and the maximum inhibition efficiency(ηw) can reach as high as 95.3%. There is a strong synergistic inhibition effect for WGHE and SLS. The synergism parameter increases with the increase of temperature in general. WGHE/SLS can more efficiently retard both cathodic and anodic reactions simultaneously. Nyquist spectrum exhibits a depressed capacitive loop, and the charge transfer resistance follows the order: WGHE/SLS>WGHE>SLS. SEM and AFM micrographs confirm that WGHE/SLS can efficiently alleviate the corrosion degree of steel surface in phosphoric acid media. There is a synergism between SLS with any one of the major components such as rutin, quercetin and 1-methylnaphoqinone in WGHE respectively, but their synergistic inhibition is all below that of the complex WGHE/SLS.

关 键 词：核桃青皮 十二烷基磺酸钠 冷轧钢 缓蚀协同效应 磷酸 

分 类 号：TG174[金属学及工艺—金属表面处理]