Abstract
Acrylic acid was tested as a corrosion inhibitor for C-steel in 0.5 M H2SO4 using gasometry, weight loss, and galvanostatic polarization techniques. Polymeric film is built up by cyclic voltammetry technique. The potentiodynamic polarization is used to examine the inhibition effect with the coated polymeric film. The data obtained from the different techniques coincide in that acrylic acid is a good mixed-type inhibitor. The inhibition process is based on the adsorption of acrylic acid on the surface of C-steel according to Temkin’s adsorption isotherm. The inhibition efficiency increases with inhibitor concentration and decreases with temperature. The thermodynamic parameters ΔE, ΔH*, ΔS*, and ΔG*ads were calculated to elaborate the mechanism of corrosion inhibition.
Highlights
Corrosion process plays an important role in the fields of economics and safety
The cyclic voltammetry is used to form a polymeric film of acrylic acid on C-steel electrode in 1 x 10-2 M H2SO4, at a scan rate of 50 mV/s
The data indicated that the hydrogen gas evolution starts after the elapses of a certain time from the immersion of C-steel in the test solution, which is depend on the acid concentration
Summary
Various types of steel included in different industries (chemical and electrochemical industries, medical, nuclear, petroleum, power, and food production), and in daily life. It suffers from a certain type of corrosion within some environments. The processes of adsorption of inhibitors are influenced by the nature and surface charge of the metal,the chemical structure of organic inhibitors, the distribution of charge in the molecule, the type of aggressive electrolyte, and type of interaction between organic molecules and the metallic surface [11,12,13,14]. The formed film is tested as a coat against corrosion of C-steel in 0.01 M H2SO4 by potentiodynamic method
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