摘要
为获得环保、高效的热力设备酸洗缓蚀剂,以无水乙醇为萃取剂,采用索氏提取法提取茶籽壳中的有效成分作为热力设备酸洗缓蚀剂主要成分。设计4因素3水平正交试验得出最优产率的提取条件,并对提取物作为酸洗缓蚀剂的机理进行了分析。吸附等温线分析结果表明:在20G钢表面的吸附模式为典型的单分子层吸附。利用失重法、Tafel极化曲线和电化学交流阻抗法对提取物的缓蚀性能进行了研究,结果表明:在提取物浓度为0.35%、温度为(90±1)℃、静态挂片24 h的混合酸(4%的羟基乙酸和1%的甲酸)酸洗介质中,茶籽壳提取物作为酸洗缓蚀剂具有良好的缓蚀性能,对20G钢的静态腐蚀速率为1.49 g/(m^(2)·h),缓蚀率为91.38%。Fe^(3+)浓度对缓蚀效率影响大,酸洗液中Fe^(3+)浓度应控制在300 mg/L以下;提取物同时抑制了阴极和阳极反应,是以控制阳极反应为主的混合型缓蚀剂。
In order to obtain an environment-friendly and efficient thermal equipment pickling inhibitor,using anhydrous ethanol as the extractant,the effective ingredients in the tea seed shells were extracted by Soxhlet extraction method,and the product could be used as the main components of the thermal equipment pickling inhibitor.The orthogonal test of 4 factors and 3 levels was designed to obtain the extraction conditions of the optimal yield,and the mechanism of the extract as a pickling inhibitor was analyzed.The adsorption isotherm analysis results showed that the adsorption mode on the surface of 20G steel was typical monolayer adsorption.The corrosion inhibition performance of the extract was studied by weight loss method,Tafel polarization and electrochemical AC impedance method.Results showed that under the condition including the acidic medium with the extract concentration of 0.35%,the temperature of(90±1)℃,tea seed shell extract had good corrosion inhibition performance as a pickling inhibitor for 24 h static coupon in the mixed acid(4%glycolic acid and 1%formic acid)pickling medium.The static corrosion rate of 20G steel was 1.49 g/(m 2·h),and the corrosion inhibition rate was 91.38%.Besides,Fe^(3+)concentration had a great influence on the corrosion inhibition efficiency,and Fe^(3+)concentration in the pickling solution should be controlled below 300 mg/L.The extract inhibited both the cathode and anode reactions,and belonged to a mixed corrosion inhibitor that mainly controls the anode reaction.
作者
梅其政
史妮
MEI Qi-zheng;SHI Ni(School of Power Engineering,Chongqing Electric Power College,Chongqing 410053,China)
出处
《材料保护》
CAS
CSCD
2021年第10期58-63,92,共7页
Materials Protection
基金
重庆市教育委员会科学技术研究计划青年项目资助项目(KJQN202002602)。
关键词
茶籽壳
索氏提取法
酸洗缓蚀剂
缓蚀行为
Fe^(3+)浓度
tea seed shell
Soxhlet extract method
acid pickling inhibitor
inhibition behavior
Fe^(3+)concentration
