Abstract
Experiments were conducted to investigate the behaviour of different concentrations of 3–amino–1,2,4–triazole (ATR), 2–amino-thiazole (ATH), and 2,6–diamino-pyridine (DAP) as corrosion inhibitors for carbon steel exposed to a kerosene-water mixture containing 3ppm HCl and 800ppmH2S/day at 55–60°C and pH 6–6·5 with different exposure times, using ammonia as a neutralising agent. Screening tests over, a period of 50 h showed that the presence of 10ppm of the compounds (ATR, ATH, and DAP) with ammonia as a neutralising agent in the absence and in the presence of 10ppm octylamine gave good inhibitor efficiencies (∼90%). After 400 h of exposure the inhibitor efficiencies ranged between 50–75% depending on the material added to the test solution. XPS studies of the layer formed on the carbon steel surface indicate the formation of Fe(II) and Fe(III) complexes with the organic compounds used.
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