盐酸溶液中有机磷缓蚀剂DPPM对Q235钢的缓蚀性能研究

Study on Inhibition of Organophosphorus Inhibitor DPPM for Q235 Steel in Hydrochloric Acid Solution

合成了有机磷缓蚀剂1,1-双(二苯膦基)甲烷(DPPM),采用电化学极化曲线法研究了DP-PM在1.0 mol·L-1HCl溶液中对Q235钢的缓蚀作用,并考察了DPPM浓度、HCl浓度、试验温度和缓蚀液放置时间对DPPM缓蚀性能的影响。研究结果表明DPPM为混合型缓蚀剂,在30℃时,DPPM浓度为80 mg·L-1的1 mol·L-1HCl溶液中,缓蚀剂DPPM对Q235钢的缓蚀率达到了97.43%。DPPM的缓蚀率随腐蚀体系温度升高而降低,同样随体系酸度增大而降低,但随时间的延长,其缓蚀性变化不大。

The organophosphorus inhibitor of compound, bis （diphenylphosphino） methane （ DPPM）, is synthesized, and its inhibition performance is studied by potentiodynamic polarization for Q235 steel in HC1 solution. In addition, the influence factors of corrosion inhibition, which include the DPPM concentration, HC1 concentration, system temperature, and immersion time of the inhibitor solution have been performed. The studies show that the DPPM is a mixed-type inhibitor and its inhibition efficiency for Q235 steel is up to 97.43 % in 1.0 mol· L^-1 HC1 solution with 80 mg · L^-1inhibitor DPPM at 30℃. The inhibition efficiency for Q235 steel decreases with the increasing of temperature, and decreases with the increasing of HC1 concentration as well, but the inhibition efficiency has a little change with the increasing of immersion time.