Synthesis and study of corrosion-inhibiting activity of several 1,12-dodacanediamine derivatives.

摘要

Corrosion, the deterioration or destruction process of materials, has severe impact on our life in many sides, such as economy, safety, health etc. Research and development on corrosion inhibitors are carried out in a continuous mode to control such destructive phenomenon. The thesis discuss the synthesis and evaluation of a new series of nitrogen-containing corrosion inhibitors. These products can be classified under mono- and diamine corrosion inhibitors moiety. All examined corrosion inhibitors exhibited excellent corrosion inhibition for a mild steel in HCl acid. However, for H2SO 4 acid only monoamine showed good corrosion protection while diamine corrosion inhibitors were poor. Indeed, both groups revealed very good thermal stability (170--200°C). The suggested inhibition mechanism for all tested compounds involves a simple reaction site blocking. Both diamine and monoamine synthesized corrosion inhibitors appear to function through adsorption, following the Temkin adsorption isotherm.;The synthesized corrosion inhibitors were characterized using 1H NMR, 13C NMR and FTIR Corrosion inhibition measurements were conducted using gravimetric (weight loss) and electrochemical methods (Tafel Extrapolation, Linear polarization and Cyclic Polarization). Thermal stability of these corrosion inhibitors was evaluated using TGA and DSC techniques.