山梨醇磷酸酯缓蚀阻垢剂的合成及性能研究

Synthesis of Sorbitan Phosphate Corrosion Scale Inhibitors and Its Performance

以山梨醇和磷酸为反应单体合成了山梨醇磷酸酯缓蚀阻垢剂（SPA）,以缓蚀率作为考察指标,研究了相关因素对SPA缓蚀性能的影响。应用静态阻垢测定方法和常压静态测定方法评价了SPA的阻垢性能和缓蚀性能,通过电化学法探讨了其缓蚀机理。实验结果表明,采用常压合成法,在山梨醇和磷酸摩尔比为3：1、酯化反应时间3h和反应温度120率140℃下,合成的SPA性能最佳。当质量浓度大于25mg/L时,SPA具有较好的阻CaCO3垢性能,阻CaCO3垢率为90%以上。当加量为100mg/L时,A3钢片在模拟水中的腐蚀速率为0.0234mm/a,缓蚀率为85.26%。动电位扫描极化曲线表明,SPA是以抑制阴极为主的混合型缓蚀剂。

A sorbitan phosphate corrosion scale inhibitors （SPA） was prepared from the reaction monomers of sorbitol and phosphoric acid. The influence of relevant factors on the corrosion performance of SPA was studied using the corrosion rate as the evaluating index. The scale and corrosion inhibition performance of SPA was evaluated by using the static scale evaluation and the atmospheric static method, and the mechanism of corrosion inhibition was discussed though electrochemical polarization curves. The experiment results showed the SPA had best property when synthesized at atmospheric pressure, the mole ratio of sorbitol and phosphoric acid was 3：1, the esterification reaction time was 3 h and the optimum temperature was 120℃- 140℃. The inhibition rate of the SPA on CaCO3 scale was more than 90% when the mass concentration was greater than 25 mg/L. The corrosion rate of A3 steel in the simulated water was 0.0234 mm/a and the corrosion rate was 85.26% when the dosage of the SPA was 100 mg/L. The potentiodynamic polarization curves showed that SPA was a mainly cathode-controlling mixed corrosion inhibitor.