钨酸钠及其复配缓蚀剂在模拟海水中对碳钢的缓蚀性能

目的考察在模拟海水中,钨酸钠及其与月桂酰肌氨酸钠复配物对Q235钢的缓蚀性能。方法进行挂片失重法实验,研究缓蚀剂添加量对缓蚀效率的影响;测定电化学极化曲线及阻抗谱,对比单一钨酸钠缓蚀剂与复配缓蚀剂的缓蚀效率以及相关拟合数据。结果钨酸钠单独使用时的缓蚀效果良好,缓蚀效率随着添加量的增加而增大,且在碳钢表面的吸附符合修正了的Langmuir吸附模型;与月桂酰肌氨酸钠复配后,缓蚀效率更高,阴极、阳极的塔菲尔斜率均减小,腐蚀电流密度也降低了很多。结论钨酸钠与月桂酰肌氨酸钠复配后比单独使用效果更好,二者有较好的协同缓蚀增效作用;复配缓蚀剂为混合型缓蚀剂。

Corrosion Inhibition Performances of Sodium Tungstate and Its Composite for Carbon Steel in Simulated Seawater

Objective To investigate the corrosion inhibition performances of sodium tungstate and the sodium tungstate-SLS composite on Q235 steel in simulated seawater. Methods Effects of inhibitor additions on the corrosion inhibition efficiency were studied using weight loss of tested pieces. Based on the electrochemical polarization curve and impedance test, the inhibition efficiencies and related fitting data of sodium tungstate inhibitor when used alone or in combination were compared. Results Sodium tungstate was a good inhibitor for carbon steel in simulated seawater, and the inhibition efficiency increased with the increasing inhibitor concentration, and the adsorption of sodium tungstate onto the surface of carbon steel followed the amended Langmuir adsorption isotherm equation. Compound inhibitors had higher efficiency, with lower Tafel slope on the cathode and anode and significantly reduced corrosion current density. Conclusion Composite of sodium tungstate and SLS had better corrosion performance than that of sodium tungstate alone, which showed excellent synergistic effect. Compound inhibitor was a mixed-type inhibitor.