磺胺嘧啶和硫氰酸钠在硫酸介质中对Q235钢的缓蚀协同作用  

Synergistic Effect of Sulfadiazine and Sodium Thiocyanate for Corrosion Inhibition of Q235 Steel in Sulphuric Acid Medium

作　　者：崔益顺 谯康全 宗政 CUI Yishun, QIAO Kangquan2, ZONG Zheng(1 School of Chemical Engineering, Sichuan University of Science ＆ Engineering, Zigong 643000, China 2 Analysis and Testing, Sichuan University of Science ＆ Engineering, Zigong 643000, Chin)

机构地区：[1]四川理工学院化学工程学院,自贡643000 [2]四川理工学院分析测试中心,自贡643000

出　　处：《腐蚀科学与防护技术》2018年第2期143-149,共7页Corrosion Science and Protection Technology

摘　　要：以磺胺嘧啶(SD)和硫氰酸钠(NaSCN)在0.5 mol/L硫酸介质中对Q235钢的缓蚀作用为研究对象,采用失重法、极化曲线法、扫描电子显微镜表征等方法研究了两者复配的协同缓蚀行为及吸附模型,并通过均匀设计实验获得了复配缓蚀剂的最佳配方。结果表明:磺胺嘧啶及其复配物均为混合型缓蚀剂,都符合Langmuir等温吸附模型;复配后两种缓蚀剂之间的协同效应明显,吸附热力学和动力学参数明显改善,缓蚀率显著提高。扫描电子显微镜测试结果显示,磺胺嘧啶复配后钢表面腐蚀程度明显降低,由局部腐蚀为主转换为均匀腐蚀为主。均匀设计试验获得的复配缓蚀剂最佳配方为:磺胺嘧啶1200 mg/L、NaSCN 960 mg/L,缓蚀率高达92.65%。Synergistic inhibitory action and adsorption models of the compound of sulfadiazine（SD）and sodium thiocyanate（NaSCN） on the corrosion of Q235 steel in 0.5 mol/L H2SO4 were investigated using weight loss method, polarization curves and scanning electron microscopy（SEM）, and the optimum formula of the compound was determined by uniform design testing method. Results were as follows： SD and NaSCN are both mix-type corrosion inhibitor and all follow the Langmuir isotherm. The adsorption thermodynamic and kinetic parameters show that the synergistic effect of SD and NaSCN is very obvious, and the corrosion inhibition performance of SD can be significantly enhanced with the addition of NaSCN. SEM results indicate that the corrosion rate and the degree of localized corrosion of the steel in 0.5 mol/L H2SO4 with SD and NaSCN respectively can both be obviously alleviated with their mixture,the localized corrosion converted into uniform corrosion. The results of uniform design experimental indicate that the compound inhibitors show the highest inhibition efficiency 92.65% for a dose of 1200 mg/L SD and 960 mg/L NaSCN.

关 键 词：磺胺嘧啶 Q235钢 硫酸 缓蚀 均匀设计 线性极化电阻 

分 类 号：TG174.42[金属学及工艺—金属表面处理]