输油站场用复配缓蚀剂的合成及性能评价

Synthesis and Performance Evaluation of Compound Corrosion Inhibitor for Oil Transmission Station

为了减缓输油站在高矿化度环境下的腐蚀现象,通过静态失重法、动电位极化曲线、电化学阻抗谱以及金相显微镜等方法,研究了4种复配缓蚀剂在罐底模拟沉积水中对L360钢的缓蚀作用。结果表明:在50℃的条件下,4种缓蚀剂的添加均可以抑制L360钢的腐蚀,温度升高后缓蚀剂2、4号的缓蚀效率均在90%以上,并且受压力和转速影响较小;4种缓蚀剂均属于混合型缓蚀剂,并且可以同时抑制阳极反应和阴极反应;根据Arrhenius公式计算,发现1、3号缓蚀剂的斜率有所变化,说明这2种缓蚀剂受温度影响程度较大,而缓蚀剂2、4号受温度影响程度较小。

In order to slow down the corrosion of oil transmission station in high salinity environment, the corrosion inhibition effect of four compound corrosion inhibitors on L360 steel in simulated deposit water at the bottom of tank was studied by static weight loss method, dynamic potential polarization curve, electrochemical impedance spectroscopy and metallographic microscope. Results showed that at 50 ℃, these four corrosion inhibitors could all inhibit the corrosion of L360 steel. And when the temperature was increased, the corrosion inhibition efficiencies of corrosion inhibitor 2 and 4 were both higher than 90%, meanwhile, the corrosion inhibition efficiency was less affected by the pressure and rotation speed. The four corrosion inhibitors were all mixed corrosion inhibitors which could inhibit both anode and cathode reactions. According to the Arrhenius formula, it was found that the slopes of the corrosion inhibitor 1 and 3 were changed, indicating that the two corrosion inhibitors were more affected by temperature, while the corrosion inhibitor 2 and 4 were less affected by temperature.