盐酸溶液中二环己基硫脲对304不锈钢的缓蚀作用

Corrosion Inhibition of 304L Stainless Steel by Dicyclohexyl Thiourea in HCl Solution

通过动电位极化曲线以及扫描电子显微镜观察,研究了四个温度下,二环己基硫脲(DCTU)对304L不锈钢在2 mol/L盐酸溶液中的缓蚀作用.结果表明:二环己基硫脲(DCTU)是304L不锈钢有效的阳极缓蚀剂,缓蚀效率随缓蚀剂的浓度和温度变化.二环己基硫脲(DCTU)在304L表面的吸附符合Temkeins吸附等温式,遵循化学吸附机理.相应的吸附动力学参数表明了金属基体与缓蚀剂间强烈的交互作用和自发吸附行为.

At four different temperatures,by potentiodynamic polarization curve,the inhibiting effect of dicy clohexyl thiourea （DCTU） on the corrosion behavior of 304L stainless steel in 2 mol/L hydrochloric acid solution was investigated.The result indicated that DCTU acted as an efficient anodic inhibitor for the corrosion of 304L SS.Excellent inhibition efficiency was evident in the acidic solution and found to vary with temperature and concentration of the inhibitor.The adsorption of this compound on the 304L SS surface was found to obey Temkeins adsorption isotherm and the inhibition was governed by chemisorption mechanism.The deduced thermodynamic parameters of adsorption revealed a strong interaction and spontaneous adsorption of DCTU on the metal surface.