2,4-Dihydrazino-6-Morpholino-1,3,5-Triaizne (DHMT) and 2,4- Dihydrazino-6-Piperidino-1,3,5-Triaizne (DHPT) as Promising Corrosion Inhibitors of Steel in Acidic Media

摘要

The effect of the two compounds 2,4-dihydrazino-6-morpholino-1,3,5-Triaizne (DHMT) and 2,4- dihydrazino-6-piperdino-1,3,5-triaizne (DHPT) for corrosion inhibition of steel in hydrochloric acidsolution was investigated using electrochemical techniques. DHMT and DHPT were prepared from1 13 cyanuric chloride and completely characterized by IR, H NMR, C NMR, and elemental analysis.The electrochemical results indicated good protection performance of the both tested materials towardsthe corrosion of steel in the chloride-containing environment. Polarization data indicated that thetested DHMT and DHPT labeled as mixed type inhibitors. Nyquist plots composed of a capacitiveloop and its diameter increased with increasing inhibitor concentration. The calculated values of IEfrom EIS method follow the same trend as those obtained from the polarization results. The resultsindicated that DHMT and DHPT affects the electrochemical properties of steel surface and promotedan insulating layer and strong modifications in the impedance response. At high concentration (225ppm and 150 ppm) both showed the same performance, while at low concentration (25 ppm and 75ppm) DHMT show better performance than DHPT. This behaves due to the presence of the oxygenpromotes a better film coating on steel.