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Hydroxamic Acid Corrosion Inhibitor for Steel in Aqueous Solution

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Abstract:

The selected dihydroxamic acid derivatives, namely oxalyl-dihydroxamic acid (C2) and pimeloyl-1,5-di-hydroxamic acid (C7) have been synthesized and evaluated as corrosion inhibitors for carbon steel in neutral aqueous solution by potentiodynamic polarization and ac impedance methods. C2 molecule acts as good inhibitor with inhibition efficiency value reached 91%; it is well adsorbed most likely throughout the two hydrophilic groups, and forms a protective film on the metal surface. C7 has moderate inhibition efficiency probably due to the presence of long single hydrocarbon chain in the molecule, negatively affect the adsorption process. Addition of Ni2+ to C7 significantly improve the inhibition efficiency, throughout the formation of a dense compact layer of complexes between Ni2+ and C7.

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Periodical:

Materials Science Forum (Volumes 537-538)

Pages:

81-88

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.537-538.81

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Online since:

February 2007

Authors:

Abdulmajed Alagta, Ilona Felhősi, Erika Kálmán

Keywords:

AC Impedance, Adsorption, Corrosion Inhibitor, Dihydroxamic Acid

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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