精细化工设备腐蚀影响因素及防护措施

Study on Factors Affecting Corrosion of Fine Chemical Equipment and Protective Measures

为了提高精细化工设备的运行效率,减缓腐蚀进程,并延长其使用寿命,室内采用电化学腐蚀实验的方法,评价了不同因素对精细化工设备电化学腐蚀的影响,并针对性地提出了腐蚀防护措施建议。结果表明:随着实验温度增高,工作介质对Q345R钢的腐蚀电位、腐蚀电流密度和腐蚀速率均先增大后减小;氯离子质量浓度越高,腐蚀电位越小,腐蚀电流密度和腐蚀速率越大;工作介质的pH越高,腐蚀电位、腐蚀电流密度和腐蚀速率就越小;氯离子质量浓度和pH对目标精细化工设备电化学腐蚀的影响相对较大。工作介质中加入腐蚀缓蚀剂RFJ-2后能够明显降低Q345R钢的电化学腐蚀速率,当其质量浓度为20 mg·L^(-1)时,可使腐蚀速率降低92.16%,达到了良好的腐蚀防护效果。

In order to improve the operational efficiency of fine chemical equipment,slow down the corrosion process,and extend its service life,the indoor electrochemical corrosion experiment method was used to evaluate the impact of different factors on the electrochemical corrosion of fine chemical equipment,and targeted corrosion protection measures were proposed.The experimental results showed that,with the increase of experimental temperature,the corrosion potential,corrosion current density and corrosion rate of Q345R steel in working medium first increased and then decreased;The higher the chloride ion concentration,the smaller the corrosion potential,and the greater the corrosion current density and corrosion rate;The higher the pH value of the working medium,the lower the corrosion potential,corrosion current density,and corrosion rate;The chloride ion concentration and pH value had a relatively large impact on the electrochemical corrosion of the target fine chemical equipment.Adding corrosion inhibitor RFJ-2 to the working medium could significantly reduce the electrochemical corrosion rate of Q345R steel.When its dosage was 20 mg·L^(-1),the corrosion rate was reduced by 92.16%,achieving good corrosion protection effect.The research results can provide some reference for the formulation of anti-corrosion measures for fine chemical equipment.