吗啉O,O'-二(环己基)二硫代磷酸盐的合成与表面活性及缓蚀阻垢性能研究

Study on Synthesis,Surface Activity,Scale and Corrosion Inhibition Evaluation of Morpholin-4-ium O,O'-dicyclohexyldithiophosphate

合成了吗啉O,O'-二(环己基)二硫代磷酸盐(MIDDP),既选用电化学和失重法评价了MIDDP作为新型缓蚀剂于H_(2)SO_(4)溶液中对Q235钢的缓蚀性能,又测定了其阻垢性和表面活性.缓蚀性评价研究结果表明MIDDP是一种混合型缓蚀剂,该缓蚀剂在Q235钢表面的吸附符合Langmuir吸附等温式.同时,研究缓蚀性能的各影响因素发现,随着缓蚀剂MIDDP浓度增加缓蚀率升高,随腐蚀体系温度升高和H_(2)SO_(4)浓度增大缓蚀率均出现下降,随静置时间推移,缓蚀效果基本不变;阻垢性和表面活性研究得知,MIDDP不仅是一种性能优异的表面活性剂,还是一种碳酸钙和硫酸钙的有效阻垢剂.

In this work,morpholin-4-ium O,O’-dicyclohexyldithiophosphate(MIDDP)acting as a novel multifunctional(corrosion inhibition,scale inhibition and surface activity)compound was successful synthesized.Meanwhile,the corrosion inhibition of MIDDP in sulfuric acid(H_(2)SO_(4))solution for Q235 steel was evaluated by weight loss and potentiodynamic polarization measurements.The study results indicated that MIDDP is mixed type inhibitor,and the adsorption of MIDD on Q235 steel surface obeys Langmuir isotherm.In addition,the inhibition efficiency increased with the increasing of concentration of MIDDP,decreased with the increasing of H_(2)SO_(4) concentration and temperature.Studies on scale inhibition and surface activity show that MIDDP is not only an excellent surfactant,but also an effective scale inhibitor for calcium carbonate and calcium sulfate scaling.