Synthesis of mono and bis-4-methylpiperidiniummethyl-urea as corrosion inhibitors for steel in acidic media

Abstract

Mono and bis-4-methylpiperidiniummethyl urea were synthesized, characterized and used as new corrosion inhibitors of mild steel in the acidic media. Inhibitory effect of two compounds on mild steel surface in the 1 mol$L -1 sulphuric acid has been studied by a series of techniques, such as potentiodynamic polarization, weight loss and quantum chemical calculation methods. Potentiodynamic polarization measurements showed that two inhibitors are mixed type. All measurements showed that inhibition efficiencies enhanced with increase of inhibitor concentration. This reveals that inhibitive actions of inhibitors were mainly due to adsorption on mild steel surface. Density functional (DFT) calculations have been carried out for the title compounds by performing HF and DFT levels of theory using the standard 6-31G* basis set.

API 5L X52 Steel Corrosion Inhibition in 3% NaCl Saturated with CO2 By Bis Triazole Carbohydrate

“…The ∆ °ads will indicate which adsorption mechanism follows the organic compound; if it is lower than -20 KJ/mol it can be considered as a physisorption process (12). If it is higher than -40 KJ/mol then is a chemisorption process, but if it is between -20 KJ/mol and -40 KJ/mol the type of process that is taking place is called "combined" (13).…”

Synthesis, Characterisation and Catalytic Studies of Nano Zinc Oxide-Alumina for Displacement Reaction on Carbonyldiimidazole

“…18 The available synthetic methods for substituted ureas mostly involve expensive catalysts such as Pd, Ru, Rh etc [19][20] and hazardous reagents such as azides 21 , isocyanates. [22][23] Due to a limited number of cost-effective and ecofriendly methods [24][25][26][27][28] and extensive application of urea derivatives 29 , especially in pharmaceutical 30 and agricultural fields [31][32][33][34][35][36][37] , continuous attention exists among the synthetic organic chemists towards developing effective methods for their synthesis. The successful synthesis of unsymmetrical tetrasubstituted ureas, reported earlier from our laboratory involve the reaction of carbonyldiimidazole (CDI) with various types of amines, in presence of trimethylaluminium (AlMe 3 ).…”

Multidimension Insight Involving Experimental and in Silico Investigation into the Corrosion Inhibition of N,N-Dibenzyl Dithiocarbamate Acid on Copper in Sulfuric Acid Solution

“…The prevailing strategy, use of corrosion inhibitors, belongs one of the most efficient and economic alternatives in controlling the corrosion of metal including copper in extreme environmental conditions. − Corrosion inhibition of organic inhibitors is mostly based on modifying the metal surface via the adsorption of inhibitor molecules and the subsequent formation of a protective layer . Practically, the most efficient inhibitors are usually of those organic compounds containing heteroatoms (oxygen, nitrogen, and sulfur atoms) or heterocycle as well as π-conjugated systems according to the previous work. − Up to now, many organic compounds have been reported as anticorrosive coatings for corrosion protection of copper in acid solution such as arginine, chitosan, methylene violet, myrtus communis, and 2-aminobenzimidazole .…”