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目的 运用响应面分析法考察缓蚀剂2-羟基膦乙酸( HPAA)的缓蚀效果. 方法 通过单因素灵敏度分析法考察pH值、HPAA质量浓度、温度对Q235钢腐蚀的影响,确定取值范围. 基于响应面优化分析法( RSM) ,根据单因素实验结果,采用中心组合设计原则( CCD)对质量浓度、温度、pH值进行优化实验设计. 以HPAA的缓蚀率为响应值,采用RSM对响应数值进行方程回归,对得到的二次关联模型进行优化,并将优化的参数条件应用于复配缓蚀剂进行SEM和EIS分析. 结果 质量浓度、温度、pH值的优化取值范围分别为20~26 mg/L,45~55 ℃和8~10. RSM优化后参数为:质量浓度23 mg/L,温度50 ℃, pH=9. 0,HPAA的缓蚀率最优为68. 68%. 实验获得的缓蚀率为68. 78%,与预测值偏差为0. 15%. 将优化的参数应用于缓蚀剂的复配,ρ(HPAA):ρ(Na2MOO4):ρ(Na2B4O7)=0. 5:0. 3:0. 5时,复配的缓蚀剂用量最少且缓蚀率最高可达到93 . 75%. 此复配缓蚀剂在SEM图中光亮无腐蚀,并且在EIS谱中表现出纯电容性,阻抗最大、缓蚀率最高. 结论 响应面法和SEM,EIS结合运用在HPAA的缓蚀性能研究中是可行、准确、可靠的.

Objective To research the corrosion inhibition of 2-hydroxy-phosphate ( HPAA) on Q235 steel by using response surface analysis. Methods By the method of single factor sensitivity analysis, the quality concentration of HPAA, temperature, pH value and other factors were investigated, and the optimal range of the three key factors was determined. Based on response surface optimization analysis ( RSM) , according to the results of single factor experiments, the optimal experimental design of mass con- centration, temperature and pH value was carried out by using central composite design principle ( CCD) . The response value of the HPAA was used for equation regression with RSM. Then the corresponding model of the quadratic associative model was ob-tained. After optimizing, the optimized parameters of the model were applied to SEM and EIS analysis of compound corrosion inhib-itors. Results The single factor analysis determined the optimal values of the three key variables of mass concentration, temperature and pH value respectively were 20~26 mg/L, 45~55℃ and 8~10. The optimal concentration of HPAA was 23 mg/L, the tem-perature was 50 ℃, and the pH value was 9, the inhibition rate of HPAA was 68. 68%. Under the conditions, the inhibition rate of the experimental results was 68. 78% with the deviation being only 0. 15% compared to the predicted value. The optimized pa-rameters were used in the compound corrosion inhibitor. It was found that when the concentration ratio of HPAA :Na2 MOO4:Na2 B4 O7 was 0. 5:0. 3:0. 5, the compound corrosion inhibitor dosage was the least with the maximum inhibition rate up to 93. 75%. The compound corrosion inhibitor showed no corrosion in the SEM diagram. The EIS spectrum showed a pure capacitance, and the impedance was the biggest with the highest inhibition rate. Conclusion The response surface method combined SEM and EIS ap-plied in inhibiting corrosion of HPAA is feasible, accurate and reliable.