Alkaloids as green and environmental benign corrosion inhibitors: An overview

Abstract

Alkaloids are naturally occurring nitrogen containing organic bases that possess diverse and significant physiological effects on animals and humans. They are mostly derived from the plants. Because of their natural and biological origin, they (alkaloids) are considered as environmental benign alternatives to be used as corrosion inhibitors at the place of traditional and toxic synthetic corrosion inhibitors. Numerous alkaloids have been employed as effective corrosion inhibitors for metals and alloys in different electrolytic media. It has been established that alkaloid molecules are associated with extensive conjugation in the form of non-bonding and π-elections through which they can interact strongly and inhibit corrosion efficiently. Present review article features the collection of reports published on the topic alkaloids as corrosion inhibitors. In this review article, we also described the corrosion and its adverse effect, mechanism of corrosion and corrosion inhibition by organic corrosion inhibitors (including alkaloids) and factors affecting the inhibition property of corrosion inhibitors. Literature study suggests that most of the alkaloids are soluble in the polar electrolytic media and thereby behave as good corrosion inhibitors. Present review article describes the inhibition effect of several classes of alkaloids such as pyridine, purine and indole derivatives that have been used previously. Chemical structures alkaloids and their mode of adsorption and interactions with the metallic surface, nature of metal and electrolyte and related salient features have also been tabulated in the review.

Appraisal of Different Inorganic Inhibitors Action on the Corrosion Control Mechanism of Mild Steel in HNO3 Solution

“…On the other hand, the corrosion inhibition mechanism occurs through the adsorption of the inhibitors ions/molecules on the corroding metal/alloy surfaces to form more stable films. Past researches had reported that some organic [20][21][22][23][24][25] and inorganic [26][27][28][29][30] compounds were used as eco-friendly corrosion inhibitors because they form complexes with metal ions on metal/alloy surface. Investigations of corrosion-inhibiting ability of inorganic radicals or ions, e.g., nitrites, molybdates, tungstates, polyphosphates are now being increasingly used as eco-friendly inhibitor due to their zero-toxic nature [10,[31][32][33][34][35][36].…”

Artificial Intelligence Berbasis QSPR Dalam Kajian Inhibitor Korosi

“…Investigasi inhibitor korosi berbasis ekstrak bahan alam (green inhibitor) terus berkembang karena bersifat ramah lingkungan, renewable, biodigradable, tidak menimbulkan polutan, tidak beracun, mudah diproduksi, murah, dan memiliki efisiensi anti korosi yang tinggi [28], [29]. Green inhibitor yang dalam struktur senyawanya mengandung cincin aromatik dan gugus heteroatom (seperti O, N, S, P) dianggap sebagai inhibitor yang efekif dan [30]- [32].…”

Electrochemical Analysis of the Influence of Purines on Copper, Steel and Some Other Metals Corrosion

“…Changes in the structure of the surface layer on the metal induce changes in the parameters, such as impedance and phase angle, so their increase indicates the formation of a layer that protects the surface. According to several review papers published regarding corrosion inhibitors and with special attention devoted to the eco-friendly corrosion inhibitors, they are now quite numerous [3][4][5][6], and purine derivatives present an important class of alkaloids studied as corrosion inhibitors [7]. Xanthines are bioorganic compounds that are a very common constituent of numerous foods and drinks, such as coffee, tea, cocoa, chocolate, etc.…”