An eco-friendly green biopolymer blend for copper corrosion inhibition
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An eco‑friendly green biopolymer blend for copper corrosion inhibition Renjini M. Nair1 · B. Bindhu1 · N. T. Manikandanath2 · R. S. Rimal Isaac3 Received: 26 July 2020 / Revised: 9 November 2020 / Accepted: 13 November 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Copper is a fascinating metal with wide applications since ancient time. Although Copper is resistant to certain environmental factors and several chemicals, aggressive medium could deteriorate the metal leading to its complete damage. The need for an eco-friendly corrosion inhibitor is much relevant in the present scenario. The inhibition efficiency of gum arabic (GA), sodium alginate (SA) and its blend is investigated using weight loss method, potentiodynamic polarization and electroscopic impedance spectroscopy (EIS) analysis in 1.0 M HCl solution. Higher inhibition efficiency is obtained at room temperature for the blend with 6666 ppm GA and 3333 ppm SA. The values of inhibition efficiency obtained are 88.8%, 80.5% and 86.2% using weight loss, potentiodynamic polarization and EIS analysis, respectively. The investigations are complemented by atomic force microscopy and field emission scanning electron microscopy which helped to analyze the physical adsorption of the biopolymer on the metal surface. The adsorption of the biopolymer on Copper obeyed Langmuir isotherm and inhibition efficiency has an inverse relation with temperature. Keywords Biopolymer blend · Copper · Corrosion inhibition
* B. Bindhu [email protected] R. S. Rimal Isaac [email protected] 1
Department of Physics, Noorul Islam Centre for Higher Education, Kumaracoil, Thuckalay, Kanyakumari District, Tamil Nadu 629 180, India
2
Surface Engineering Division, CSIR National Aerospace Laboratories, Bangalore 560017, India
3
Department of Nanotechnology, Noorul Islam Centre for Higher Education, Kumaracoil, Thuckalay, Kanyakumari District, Tamil Nadu 629 180, India
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Vol.:(0123456789)
Polymer Bulletin
Introduction Copper metal is extensively used in construction, electrical and transportation owing to its high thermal and electrical conductivity [1]. Copper is having facecentered cubic crystal structure with a thermal conductivity of 401 W/mK [2]. Corrosion adversely affects the performance of metal and periodic cleaning is necessary to maintain its efficiency. The cleaning of these oxide layers is done in industries by acid pickling [3]. Acidic medium for cleaning metals destroys its intrinsic properties. This can be prevented by addition of corrosion inhibition substances along with the cleaning medium [4]. Corrosion inhibitors are generally classified into anodic inhibitors, cathodic inhibitors and mixed inhibitors. Most anodic inhibitors contain C rO42−, NO2− or 2− MoO4 that forms a passive layer on the surface of anode [5]. This type is not always recommended, because it may increase the corrosion rate if the treatment rate is not sufficient. Cathodic inhibitors are oxygen scavengers, cathodic poisoner or cathodic precipi
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