Abstract:

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.

Key words: garlic, green corrosion inhibitor, oil field, inhibiting mechanism