HCl介质中EDBDP对Q235钢的缓蚀性能研究  

Study on Inhibition of EDBDP for Q235 Steel in HCl Solution

作　　者：谢斌[1,2] 赖川[3] 邹立科[2] 黄春[3] 冯建申[2] 陈晓霞[2] 

机构地区：[1]四川理工学院材料腐蚀与防护四川省高校重点实验室,四川自贡643000 [2]四川理工学院化学与制药工程学院,四川自贡643000 [3]四川理工学院材料与化学工程学院,四川自贡643000

出　　处：《化学世界》2010年第9期520-523,共4页Chemical World

基　　金：四川省教育厅资助项目(09ZA057)

摘　　要：采用失重法和电化学法研究了O,O′-(苯甲基)二硫代磷酸-N,N-二乙铵(EDBDP)在HCl介质中对Q235钢的缓蚀性能,两种方法共同验证了EDBDP是一种优良的缓蚀剂。失重法研究表明:25±1℃时,在5%HCl溶液中,当EDBDP浓度为120 mg/L时,缓蚀率高达99.07%;电化学研究结果表明:EDBDP受HCl浓度、温度和待测时间的影响较小,属于混合型缓蚀剂。吸附拟合表明:EDBDP在Q235钢表面的吸附符合Langmuir吸附等温式,属于几何覆盖效应下的单分子层物理吸附。The inhibition efficiency of N,N-diethylammonium O,O′-dibenzydithiophosphate（EDBDP） towards the corrosion of Q235 steel in HCl solution was studied by weight loss and potentiodynamic polarization techniques.The studies of weight loss show that the inhibition efficiency is up to 99.07% when the inhibitor concentration is 120 mg/L in 5%HCl solution at 25±1 ℃.Potentiodynamic polarization measurements clearly reveal that the investigated inhibitor is of the mixed type.The influence of temperature,immersion time and acid concentration was also studied in the presence of EDBDP in HCl.The adsorption of EDBDP on Q235 steel surface obeys the Langmuir＇s isotherm,indicating that it is physically adsorbed on the metal surface.

关 键 词：O O′-二烃基二硫代磷酸盐 缓蚀剂 缓蚀率 Q235钢 吸附 HCL 

分 类 号：TG431.20[金属学及工艺—焊接]