Open AccessStudy of the Corrosion Inhibitive Effect and Adsorption Process of Two Azo-Aldehydes on Carbon Steel in 1 M H2SO4
Author(s) -
Hamida Edan Salman,
Asim A. Balakit,
Mahmood A. Albo Hay Allah
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/571/1/012078
Subject(s) - physisorption , adsorption , gravimetric analysis , corrosion , carbon steel , langmuir adsorption model , electrochemistry , chemistry , metal , carbon fibers , nuclear chemistry , inorganic chemistry , materials science , organic chemistry , electrode , composite number , composite material
Two aromatic aldehydes with azo linkage (AS1 and AS2) were assessed for their inhibitive effect on carbon steel corrosion in 1 M H 2 SO 4 . The inhibition efficiency was studied by gravimetric and electrochemical analysis. The effects of concentration and temperature on the inhibition efficiency have also been studied. The obtained results showed that both of the used compounds can be considered as efficient carbon steel corrosion inhibitors. The compound which has methyl group in its structure (AS2) has higher inhibition efficiency (93.11% with 0.2 mM at 303 K by electrochemical analysis) than the one with cyano group (AS1). The adsorption isotherms of the inhibitors were studied; it was found that the adsorption of the two compounds obeys Langmuir isotherm. The studied inhibitors are mixed type inhibitors and adsorbed onto the surface of the carbon steel by a physisorption process. SEM and AFM techniques were used to study the effect of the aggressive solution on the morphology of the metal surface in the absence and presence of the used inhibitors.