Inhibitive action of some bipyrazolic compounds on the corrosion of steel in 1M HCl

Synthesis and characterization of new quinoxaline d erivatives of 8- hydroxyquinoline as corrosion inhibitors for mild s teel in 1.0 M HCl medium

“…Melting points were determined on an automatic electrothermal IA 9200 digital melting point apparatus in capillary tubes and are uncorrected. The recording of NMR spectra was performed on a Bruker Advanced 300 WB at 300 MHz for solutions in Me 2 SO-d 6 and chemical shifts are given in δ ppm with reference to tetramethylsilane (TMS) as an internal standard. The progress of the reaction is followed by chromatography with thin layer (TLC) of silica 60 F254 (E. Merck).…”

“…So, stopping or at least slowing this damage became mandatory. The broad use of acid solutions in the industries (manufacturer fertilizer industries [3], metallurgical industry, particularly for descaling, pickling of metals and cleaning of industrial plants or metals) [4], is widely characterized by the synthesis of organic and inorganic chemicals, but despite the aggressiveness of these in acidic solutions [5], the only solution to overcome this undesirable problem presenting organic inhibitors became mandatory to stop the deterioration of the metal [6]. Their selection depends on the type of acid, its concentration, the temperature and the metal material exposed to the action of the [7] acid solution.…”

A peony-leaves-derived liquid corrosion inhibitor: protecting carbon steel from NaCl

“…The adsorption of these polar atoms is made possible by the co-ordination between their non-bonded (lone pair) or π-electron cloud and the metal surface. This is known as chemical adsorption or adsorption due to electrostatic interaction between the organic molecules and the metallic surface (26,(28)(29)(30)(31). The inhibition efficiency of these polar atoms usually obeys the following sequence (28):…”

Colocid Dye - A Potential Corrosion Inhibitor for the Corrosion of Mild Steel in Acid Media

“…The decrease in C dl values with the increase in inhibitor concentration is due to the adsorption of inhibitor molecules at the metal -solution interface with the replacement of water molecules, which led to the decrease in local dielectric constant and/or an increase in the thickness of electrical double layer 31 . Hence the decrease in C dl values caused by the gradual displacement of H 2 O molecules by the adsorption of inhibitor dye molecule at the metal-solution interface decreases the extent of the corrosion 32 .…”