Hydroxypropyl methylcellulose as a polymeric corrosion inhibitor for aluminium

Abstract

Purpose -The paper aims to investigate the effectiveness of hydroxypropyl methylcellulose (HPMC) as corrosion inhibitor for aluminium in 0.5 M H 2 SO 4 solution. Design/methodology/approach -This study was carried out using weight loss and electrochemical techniques. Inhibition efficiency was determined by comparing the corrosion rates in the absence and presence of inhibitor system. Quantum chemical computations were performed using density functional theory to assess the parameters responsible for the inhibition process and also to analyse the local reactivity of the molecule.Findings -HPMC inhibited aluminium corrosion in the acidic environment. The inhibition efficiency was found to depend on concentration of the inhibitor. Impedance results reveal that HPMC is adsorbed on the corroding metal surface. Polarization results show that the dissolution reaction is due to destabilization of the passive oxide film on the Al surface. Adsorption of the inhibitor is approximated by Freundlich adsorption isotherm and the calculated standard free energy of adsorption indicates weak physical interaction between the inhibitor molecules and aluminium surface. This can be attributed to preferential interaction of the active sites with the passive oxide layer. The calculated quantum chemical parameters show good correlation with the inhibition efficiency. Practical implications -HPMC could find possible application as a polymeric thickener and additive to improve corrosion resistance and barrier properties of anticorrosion paints. Originality/value -This paper provides novel information on the inhibitive characteristics of HPMC under the stated conditions. The inhibitor systems provide an effective means for suppressing aluminium corrosion even in highly aggressive acidic environments.

Synthesis, characterization, and utilization of a diallylmethylamine-based cyclopolymer for corrosion mitigation in simulated acidizing environment

“…Polymers are solubility property in aqueous medium. Some reports have highlighted the enhancement of the corrosion inhibition efficiency of polymeric compounds by combination with metals cations [15][16][17][18] or halide anions [19][20][21][22]. In our laboratory, we have equally demonstrated the beneficial influence of halide ions particularly iodide ions on protection effectiveness of polymers [23,24].…”

“…environmentally friendly, possess inherent stability, and have multiple adsorption centers. However, in some cases, polymers exhibit moderate corrosion inhibiting performance [13,14] as a result of their poor…”

Corrosion Inhibition of High Speed Steel by Biopolymer HPMC Derivatives

“…Meanwhile, HPMC has a good capability for distributing and preventing grease and gas penetration [ 23 ], and is therefore used in sustainable manufacturing [ 24 ]. Moreover, owing to its biocompatibility [ 25 ] and decomposability [ 26 , 27 ], it is also used as a corrosion inhibitor [ 28 , 29 , 30 , 31 ]. Traditional HPMC is soluble in water; thus, it is not suitable for a water and high humidity environment.…”

Indole-3-carbaldehyde and 2-methylindole as corrosion inhibitors of mild steel during pickling

“…Acid wash solutions have been widely used for surface preparation of metals in many industries. Corrosion inhibitors are added to these solutions in small amounts to reduce metal dissolution and acid consumption (El Issami et al, 2007;Okechi Arukalam et al, 2014;Zaabar et al, 2014;Elayyachy et al, 2004;El-Haddad et al, 2013;Mobin et al, 2013;Hamani et al, 2014;Zhang et al, 2015;Wang et al, 2004;Tebbji et al, 2005;Abd El-Maksoud and Fouda, 2005). In this regard, different kinds of inhibitors like mercapto and indole derivatives are used in acid wash solutions.…”