Q345R在微量小分子有机酸中的腐蚀行为研究

本文通过腐蚀失重试验、腐蚀产物分析和交流阻抗谱研究了Q345R在不用的微量的两种小分子有机酸(甲酸和乙酸)中的常温25℃和液相高温85℃中腐蚀行为.根据试验结果可知,随着浓度的逐渐升高,Q345R在两种小分子有机酸腐蚀速率均有所升高,腐蚀产物逐渐增厚,腐蚀形貌未发生明显变化.根据电化学试验结果,在25℃环境温度下,小分子有机酸对Q345R的腐蚀剧烈程度随时间明显降低,并且表面吸附作用明显减弱.在85℃环境温度下,小分子有机酸对Q345R的腐蚀剧烈程度随时间变化不大,反应行为也未发生明显的变化.这说明在较高的温度下,随着反应激活能提高,扩散条件并非控制腐蚀反应的最主要因素,腐蚀行为也与较低环境温度下产生显著的区别.

Q345R in Trace Small Molecule Organic Acids Research on Corrosion Behavior

In this paper,corrosion methods of corrosion weight-loss test,corrosion product analysis,and chemical impedance spectroscopy(EIS)were used to evaluate the corrosion behavior and degree of Q345R in two kinds of small molecular organic acids(formic acid and acetic acid)at room temperature of 25℃and high temperature of 85℃.According to the results,the corrosion rate of Q345R increased with the increasing of concentration of corrosion ions,and the corrosion products become thicker,but the corrosion morphology not change significantly.According to the EIS results,the corrosion severity and surface adsorption all decrease with time increasing at 25℃.By contrast,they are nothing changed at high temperature of 85℃.This result indicates that the diffusion is not the most important factor in the corrosion reaction control at higher temperature,and the corrosion behavior is also significantly different from that at room temperature of 25℃.