摘要
为证实缓蚀剂可以控制已经形成完整膜下的钢表面的腐蚀,采用极化曲线法、交流阻抗技术及理论分析研究了NaHCO_3溶液中巯基乙酸(TGA)在FeCO_3膜表面的吸附行为及其对A3钢腐蚀行为的影响。结果表明:TGA在腐蚀产物膜上形成了多层吸附,其缓蚀机理为"负催化效应",浓度为1000 mg/L时具有最好的缓蚀效果;TGA在腐蚀产物膜表面的吸附反应为自发过程,吉布斯自由能为-25.766 kJ/mol。
In order to confirm the inhibition effect of corrosion product film of A3 steel, the adsorption bebavlour of TGA （thioglycolic acid） on FeCO3 surface and its intfibition mechanism in sodium bicarbonate solution were studied by polarization curves, EIS and theoretical analysis. The results indicated that TGA formed a multi-layer film on the surface of FeCOa and acted as negative catalytic inhibitor, its inhibition effect reached the maximum at the concentration of 1000 mg/L, The adsorption of TGA is spontaneous and the corresponding Gibbs free energy is --25. 766 M/mol.
出处
《腐蚀与防护》
CAS
北大核心
2010年第1期10-13,共4页
Corrosion & Protection
关键词
NAHCO3
巯基乙酸
吸附
腐蚀产物膜
sodium bicarbonate
thioglycolic acid
adsorption
corrosion product film
