大蒜汁在油田腐蚀介质中的缓蚀作用

本文利用失重法研究了大蒜汁在“碳钢－盐酸”、“碳钢－油田注水”以及分别进行充CO2或H2S“碳钢－油田注水”体系中的缓蚀效果，通过扫描电镜形貌观察和电化学测试初步探讨了缓蚀作用机理。结果发现，大蒜汁在酸性溶液中具有良好的缓蚀效果，在80℃下的15%盐酸溶液中缓蚀效率最高可达95.4%，缓蚀率随着酸浓度的增加而逐渐降低。大蒜汁在三种油田注水中也有一定的缓蚀作用，缓蚀效率在42%到64%之间。采用大蒜缓蚀的金属表面覆盖有一层致密的薄膜，动电位极化测试显示为吸附成膜。

Function of Garlic as Corrosion Inhibitor in Oil Field

Garlic juice was used as corrosion inhibition to add into hydrochloric acid and oil field water with or without saturated with CO2 or H2S. The effects of garlic on the corrosion behavior of carbon steel were studied using weight loss method, and the corrosion inhibiting mechanism was proposed by the use of SEM and electrochemical method. The results show that garlic can obviously slow down the corrosion rate of steel in hydrochloric acid, and the inhibitor efficiency reaches 95.4% in 15% HCl at 80℃. The inhibitor efficiency will decrease with the increase in the concentration of hydrochloric acid. Garlic juice can also slow down the corrosion rate of steel in oil field water, and the inhibitor efficiency holds from 42% to 64%. One kind of thin film can form on the steel surface, and studies reveal that the film belongs to absorbed film.