Innovative Method for Longer Effective Corrosion Inhibition Time: Controlled Release Oil Palm Empty Fruit Bunch Hemicellulose Inhibitor Tablet

Abstract

This study aims to develop a controlled release oil palm empty fruit bunch hemicellulose (EFB-H) inhibitor tablet for mild steel in 1 M HCl. As plant extracts tend to deteriorate at longer immersion time, limiting its industrial applicability, we attempted to lengthen the inhibition time by forming a controlled release inhibitor tablet. Electrochemical methods (potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS)) were employed to investigate the efficiency and mechanism of the inhibition. An optimum dosage and immersion time was determined via Response Surface Methodology (RSM). EFB-H tablet was formulated using D-optimal mixture design, and its anticorrosion action at extended immersion time was compared with EFB-H powder. PDP measurement revealed that EFB-H is a mixed type inhibitor. RSM optimization unveiled that the optimum point for a maximum inhibition efficiency (87.11%) was at 0.33 g of EFB-H and 120 h of immersion time. Tablet T3 with EFB-H to gum Arabic to hydroxypropyl methylcellulose ratio of 66:0:34 portrayed the best tensile strength (0.243 MPa), disintegration time (152 min) and dissolution behavior. EFB-H tablet exhibited a longer-lasting inhibition effect than powder, which was 360 h as compared to 120 h for powder. Overall, EFB-H tablet has been successfully developed, and its enhanced effective inhibition time has been experimentally proven.

Phytochemical Study of Some Plant Extracts to Assess their Synergistic Corrosion Inhibition Performance-A Comparative Analysis

“…Previous investigations on mild steel in simulated 3.5 % NaCl Solution showed that the inhibition e ciency of Jatropha Curcas and Hibiscus Sabdariffa Calynx increases with increase in inhibitor concentrations 33 and disorders in the digestive, genito-urinary, respiratory, dermal, endocrine, and cardiovascular system 39 . Investigative studies revealed that oil palm leaves, and empty fruits bunch have corrosion inhibitory properties [40][41][42][43][44] .…”

<i>Acacia nilotica </i>- A Mild Steel Corrosion Inhibitor in Sulphuric Acid Medium

“…Grape seed showed 88% IE at 300 ppm, according to Marhamati et al [12]. Mangifera indica [13], Nephelium lappaceum [14], Polygonatum odaratum [15], Flacourtia Jangomas [16], Cistus monspeliensis [17], Oil palm [18], kola leaf [19], Conocarpus Erectus [20], Morinda citrifolia [21], Theobroma cacao Peel [22], Pomegranate Peel [23], Cassia auriculata [24], Citrus Sinensis Seeds [25], Prunus persica [26], Calendula officinalis [27], Alchornea Cordifolia [28], Cucurbita [29], Mimosa pudica leaves [30], Syzygium aromaticum [31], Jatropha Curcas [32], Argemone Mexicana [33], and Veronia Amygdalina [34]…”