Inhibition effect of some organic N‐containing compounds in acidic corrosion of carbonized steel

The influence of some N‐containing organic compounds such as tetraethanol‐β‐octadecenyl succinylamide (TOSA), morphonil‐β‐hexenyl succinylamide (MHSA), ammonium naphthenyltri‐n‐butyl chloride (ANBC) and 1‐(2,4,6‐trimethylphenyl)‐3‐diethylaminopropanol‐2 (TMAP) as inhibitors for the corrosion of carbonized steel in mineral acid (HCl and H₂SO₄) solutions with different concentrations has been studied by using gravimetrical, electrochemical and polarization corrosion test methods. Observes that all compounds having surface active properties behave as inhibitors of a functional active cathodic type and have an inhibition effect at the first stage of corrosion in both acids, but more effectively in H₂SO₄. Shows that inhibition effect increases with increase of temperature in 0.5N H₂SO₄ solution and decreases with increase of temperature for the higher concentrations of acidic solutions. Shows that TOSA and TMAP compared with MHSA and ANBC enchance protection properties of adsorption layer.