Polyvinyl alcohol (PVA) as a biodegradable polymeric anticorrosive material: A review on present advancements and future directions

Abstract

Polyvinyl Alcohol (PVA) is a water-soluble biodegradable polymer with many industrial and biological applications. Because of its polymeric nature, reasonably high aqueous phase solubility and biodegradable properties, the use of PVA and its suitably modified derivatives as aqueous and coating phase corrosion inhibitors have acquired great recent attention. PVA and its derivatives are associated with a proper combination of hydrophilicity and hydrophobicity, essential for effective anticorrosive activity. The present review aims to describe the past and present advancements in using PVA and its derivatives as aqueous and coating phase corrosion inhibitors. Bonding of PVA with the metallic surface in anodic, basic and neutral electrolytes has also been proposed along with their orientation. They become effective by adsorbing on the metal surface. They act as mixed-type inhibitors and create a barrier to the charge transfer process. Various experimental and computational techniques are used to describe their corrosion inhibition property.

Experimental and Computational Study on Inhibitory Effect and Adsorption Properties of N-Acetylcysteine Amino Acid in Acid Environment

“…∆E = E LUMO − E HOMO (12) teractions, if these are possible, involve the transfer of electrons between the NAC molecule frontier molecular orbitals and the d-vacant or p-occupied orbitals of the iron.…”

“…A varied range of anticorrosion systems were developed by modeling of protective layers at the metal/medium interface through the adsorption of environmentally friendly inhibitors such as drugs [7][8][9], plant extracts [10], prepolymers/polymers [11][12][13][14][15] and amino acids [6,[16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. The corrosion inhibitors contain in their molecular structure heteroatoms such as oxygen, sulfur, nitrogen and phosphorus, possessing lone electron pairs that can be easily delivered towards the iron vacant d-orbital, attaching on the substrate by strong bonds.…”

Overview of biodegradable polymers: synthesis, modification and application

“…PVA has high aqueous phase solubility and biodegradable properties due to its polymeric nature. PVA and its derivatives have demanded great recent attention [14].…”