盐酸中十二烷基硫酸钠在铝表面的吸附及缓蚀性能  

Adsorption and inhibition of sodium dodecyl sulfate on aluminum surface in hydrochloric acid

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

机构地区：[1]西南林业大学化学工程学院,云南昆明650224 [2]西南林业大学,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,云南昆明650224

出　　处：《化学研究与应用》2020年第9期1587-1595,共9页Chemical Research and Application

基　　金：国家自然科学基金项目(51761036);云南省中青年学术和技术带头人培养项目(2015HB049);云南省万人计划“青年拔尖人才”专项(51900109)。

摘　　要：采用失重法、动电位极化曲线、电化学阻抗谱(EIS)和扫描电子显微镜(SEM)系统研究了1.0 mol·L^-1 HCl中阴离子表面活性剂十二烷基硫酸钠(SDS)在铝表面的吸附及缓蚀性能。结果表明:SDS对铝的腐蚀产生显著减缓作用,20℃时最高缓蚀率可达99.0%,缓蚀率随SDS浓度的增大而上升,但随温度的上升而下降。SDS在铝表面的吸附符合Langmuir等温式,吸附方式为包含物理作用和化学作用的混合吸附。添加SDS后,表观活化能、表观活化焓、表观活化熵均增大。动电位极化曲线表明SDS为抑制阴极为主的混合抑制型缓蚀剂;Nyquist图谱在高频区为弥散容抗弧,在低频区呈感抗弧,添加SDS后铝的电荷转移电阻增加,但铝/溶液界面的常相位角元件数值下降。SEM表明SDS有效抑制了铝表面在HCl的腐蚀,使铝表面的粗糙程度急剧下降。The adsorption and inhibition of anionic surfactant of sodium dodecyl sulfate(SDS)on aluminum surface in 1.0 mol·L^-1 HCl solution was systematically studied by weight loss method,potentiodynamic polarization curves,electrochemical impedance spectroscopy(EIS)and scanning electronic microscopy(SEM)The results show that SDS evidently retards the corrosion of aluminium,and the highest inhibition efficiency can reach the optimum value of 99.0%.Inhibition efficiency increases with SDS concentration,while decreases chemical adsorption.SDS can be arranged with the increase of temperature.The adsorption of SDS on aluminum surface obeys Langmuir adsorption isotherm,and is the mixed adsorption that involves both physical adsorption and as a mixed-type inhibitor,while mainly retards cathodic reaction.Nyquist appears a capacitive at high frequencies,and followed by an inductive section.The charge transfer resistance of aluminium electrode increases with the concentration of SDS,while constant phase element value of aluminium/solution interface decreases.SEM confirms that the corrosive micro-topography and surface roughness of aluminum surface significantly decreases in the presence of SDS.

关 键 词：十二烷基硫酸钠 铝 盐酸 缓蚀 吸附 

分 类 号：O613.5[理学—无机化学]