硫酸介质中EDBDP对Q235钢的缓蚀作用  

Inhibition of EDBDP for Q235 Steel in Sulfuric Acicl Solution

作　　者：谢斌[1,2] 赖川[3] 邹立科[2] 黄春[3] 冯建申[2] 赵彬[3] 何林芯[2] 

机构地区：[1]材料腐蚀与防护四川省高校重点实验室,自贡643000 [2]四川理工学院功能材料研究所,自贡643000 [3]四川理工学院材料与化学工程学院,自贡643000

出　　处：《腐蚀与防护》2011年第3期166-169,共4页Corrosion & Protection

基　　金：材料腐蚀与防护四川省高校重点实验室重点项目(2008CL03);四川省教育厅重点项目(09ZA057);四川省科技厅科技支撑计划项目(2010GZ0130);四川省自贡市科技局重点项目(08X01)

摘　　要：合成了O,O′-二苄基二硫代磷酸-N,N-二乙铵(EDBDP),采用电化学法和静态悬挂失重法研究了EDBDP在5%H_2SO_4介质中对Q235钢的缓蚀性能。静态悬挂失重法研究表明,25℃时,在5%H_2SO_4溶液中,当缓蚀剂浓度为100 mg/L时,缓蚀率高达99.29%;动电位极化曲线研究表明,该缓蚀剂受H_2SO_4浓度、温度和浸泡时间的影响较小,属于混合型缓蚀剂;吸附拟合表明,缓蚀剂在Q235钢表面的吸附符合Langmuir吸附等温式,属于自发进行的化学吸附。A new corrosion inhibitor named N, N-diethylammonium O, O＇-dibenzydithiophosphate （EDBDP） had been synthesized and the inhibition was investigated for Q235 steel in 5% H2 SO4 solution by weight loss tests and electrochemical techniques. The studies of weight loss showed that the inhibition efficiency was up to 99. 29% when the inhibitor concentration was 100 mg/L in 5 % H2 SO4 solution at 25±1 ℃, and the adsorption of EDBDP on Q235 steel surface obeyed the Langmuir＇s isotherm. The electrochemical studies revealed that the inhibitor was mixed-type inhibitor, whose inhibition efficiency was hardly affected by concentration of H2 SO4, temperature and immersion time.

关 键 词：0 O’-二烃基二硫代磷酸盐 缓蚀剂 Q235钢 吸附 

分 类 号：TG174.42[金属学及工艺—金属表面处理]