EXPLORATION OF EXPIRED METRONIDAZOLE DRUG AS A GREEN AND SUSTAINABLE CORROSION INHIBITOR FOR STAINLESS STEEL IN 0.5M HCL SOLUTION
Abstract
ABSTRACT
The quest for sustainable and eco-friendly corrosion inhibitors has led to the exploration of unconventional sources, including expired pharmaceutical drugs. This study investigates the corrosion inhibition potential of expired metronidazole drug on stainless steel in 0.5M HCl solution. Tafel polarization tests revealed a reduction in corrosion current density, with a maximum inhibition efficiency of 77.6% at 500 ppm. The corrosion potential shifted anodically, indicating a mixed-type inhibition mechanism. This research demonstrates the viability of expired metronidazole drug as a green and sustainable corrosion inhibitor, offering a promising alternative to traditional inhibitors. The expired pharmaceutical drugs reduces waste and promotes sustainability, contributing to a more environmentally friendly approach to corrosion protection of alloys
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