Lebe A. Nnanna; Nkem B. Iroha
Abstract
The inhibiting effect of diphenoxylate drug (DD) on API X120 carbon steel corrosion in 15% HCl solution was investigated using chemical, electrochemical and surface morphological studies. The inhibition efficiency of the studied drug increases with increase in its concentrations, giving a maximum inhibition ...
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The inhibiting effect of diphenoxylate drug (DD) on API X120 carbon steel corrosion in 15% HCl solution was investigated using chemical, electrochemical and surface morphological studies. The inhibition efficiency of the studied drug increases with increase in its concentrations, giving a maximum inhibition efficiency of 95.28%, at the optimum concentration of 400 ppm. The effect of temperature revealed that the inhibition efficiency of DD decreases with temperature rise. The adsorption of DD obeyed the Langmuir isotherm and indicated predominantly physical adsorption mechanism. The electrochemical impedance spectroscopy (EIS) analysis affirmed the adsorption of the inhibitor on the X120 steel surface. Potentiodynamic polarization (PDP) study indicated that the tested drug acted as mixed type inhibitor with little anodic dominance. The result of scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) spectroscopy supported the formation of adsorbed inhibitor film on the X120 steel surface.

Kandasamy G Moodley
Abstract
In view of the fact that corrosion costs large sums of money and touches countless facets of human activities, every possible effort needs to be made to find ways to stop it from starting. In this regard inhibition of corrosion has become a thriving commercial activity, worldwide. Much research has been ...
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In view of the fact that corrosion costs large sums of money and touches countless facets of human activities, every possible effort needs to be made to find ways to stop it from starting. In this regard inhibition of corrosion has become a thriving commercial activity, worldwide. Much research has been devoted to discovering newer strategies to inhibit corrosion with concomitant improvements in corrosion inhibition materials. This review will focus on the advances in materials and technologies for corrosion inhibition, with particular attention to the evolution of technologies and materials prior to the advent of coatings, the exploitation of ‘green methods’ which use anti-corrosion materials, which protect materials without fouling the environment; and the present and projected role of nanotechnology in inhibition of corrosion. This review brings together the collected wisdom of several disciplines. The latter addressed and/or are continuing to address the need for cost-effective materials to protect strategic metals used in the domestic and industrial sectors of most countries. The scope for improving the quality of materials, required for shielding these metals from the ravages of degrading agents, present in the environments of most cities, is lucidly articulated.
