两种双吡啶盐在盐酸中对A3钢的缓蚀性能

Corrosion Inhibition Capacity of Two Dipyridinium Salts for Carbon Steel A3 in Hydrochloric Acid

用静态失重法测定了两种gemini型化合物溴化1,4-二(α-癸基吡啶)丁烷(Gp3)和1,6-二(α-癸基吡啶)己烷(Gp4)在含有1.0g/LNaCl的10%盐酸中对A3钢的缓蚀性能。25℃时Gp3在加量10mg/L时的缓蚀率即高达99.85%,加量逐步增加到500mg/L时大体上维持此高缓蚀率。90℃时,在加量20,200,800mg/L时的缓蚀率,Gp3分别为63.17%,90.62%,89.91%,Gp4分别为75.80%,92.97%,93.37%,而四川广汉油田目前使用的缓蚀剂WD-11分别为10.57%,36.95%,88.87%。两种双吡啶盐是成膜型缓蚀剂,在盐酸中对A3碳钢的缓蚀效率高而用量低。表1参7。

The inhibitive capacity of two geminis: tetramethylene bic (-αdecylpyridinium) bromide (Gp3) and hexamethylene bic (α- decylpyridinium) bromide (Gp4), for corrosion of carbon steel A3 in 10% hydrochloric acid solution containing 1.0 g/L NaCl is determined by static weight loss method.The inhibition rate ( IR) at 25℃of Gp3 is as high as 99.82% at dosage 10 mg/L and practically keeps this high IR when dosage increased gradually to 500 mg/L.The IR at 90℃and dosage 20,200, and 800 mg/L is of 63.17%, 90.62%, and 89.91% for Gp3, of 75.80%, 92.97%, and 93.37% for Gp4, and of 10.57%, 36.95%, and 88.87% for WD-11, a acid corrosion inhibitor being used in Guanghan, Sichuan, respectively.The two dipyridinium salts are film- forming inhibitors, effective at lower dosage, for steel A3 in hydrochloric acid.