Crude Glycerol as an Innovative Corrosion Inhibitor

Abstract

Crude glycerol, a byproduct of biodiesel production, was evaluated as a potential green inhibitor for steel corrosion in an acidic environment. The study was conducted using steel specimens placed in hydrochloric acid solutions (0.5 M) at a constant room temperature (25 • C) and crude glycerol concentrations in the range 0.1%-1.0% w/w. The criteria used to evaluate the extent of corrosion were the weight loss and corrosion rate. Additionally, fresh and spent samples were characterized using scanning electron microscopy and potentiodynamic polarization measurements. It was found that, generally, the corrosion inhibition increased with the inhibitor concentration. Results also showed that the maximum inhibition efficiency was achieved at 70 h residence time after which the inhibition efficiency at a given concentration either remained unchanged or dropped slight. Additionally, the overall maximum inhibition efficiency (98%) was observed at 70 h residence time and a 1% inhibitor concentration.

Progress on pharmaceutical drugs, plant extracts and ionic liquids as corrosion inhibitors

“…Recently, Al-Zubaidi et al. [79] used crude glycerol (byproduct of biodiesel production) with concentrations range of 0.1%–1.0% w/w as a potential OGCI for steel corrosion in a corrosive medium containing 0.5M hydrochloric acid at a constant room temperature of 25 °C. Researchers should focus on synthesizing composite OGCIs from greeners extracts and silicates (such as rice husk waste) to improve their efficiency.…”

“…Recently, Al-Zubaidi et al. [79] used crude glycerol (byproduct of biodiesel production) with concentrations range of 0.1%–1.0% w/w as a potential OGCI for steel corrosion in a corrosive medium containing 0.5M hydrochloric acid at a constant room temperature of 25 °C.…”

“…In most cases, the basic lab set up involves using three electrodes in the electrochemical cell which are working, counter and reference electrodes for the measurement immersed in the test solution of known volume and concentration. Platinum electrode [78] and graphite rod [79] are mostly used as the counter electrode while saturated calomel electrode [57] and Ag/AgCl aqueous electrode as the reference electrode. The working electrode is the metal substrate under examination.…”

Inibidores de Corrosão Verdes e Glicerina: Revisão e Perspectivas Futuras.

“…O uso de materiais orgânicos e biodegradáveis foram investigados como inibidores de corrosão no estudo de [18] onde, onde eles testaram várias substâncias de origem verde, dentre elas a glicerina, goma xantana, extrato de carvalho, aplicadas em metais como; aço 20, cobre e latão, obtiveram resultados de inibição, a glicerina formou um filme protetor nas peças dos metais usadas nos experimentos, o método utilizado no estudo foi o teste gravimétrico, que consiste em analisar a perda de massa dos metais, usando concentrações diferentes de inibidores em meios corrosivos, foi realizado a temperatura de 25º Celsius, corroborando com os resultados dos estudos de [19] e, que www.scientificsociety.net 1536 fizeram uso em seus experimentos, na mesma temperatura, em um intervalo de tempo de 2 horas, onde a glicerina obteve uma ação inibidora de corrosão na concentração de 2 g/dm3 na solução, inibindo a corrosão em 50%, quando, associados os inibidores produzidos no estudo, obtiveram um resultado igual 91% de ação inibidora de corrosão para o aço 20 [20].…”

“…O uso de software para simulações é eficiente para o desenvolvimento de novos produtos químicos, e quando associadas a teste em laboratórios podem corroborar os resultados experimentais com resultados teóricos [29], aplicou essa metodologia, usando como matéria prima o resíduo da fruta Jaca, tendo como corpo de prova o aço macio, obtendo um filme protetor, corroborando com os resultados de [18].…”