Evaluation of pectin isolated from tomato peel waste as natural tin corrosion inhibitor in sodium chloride/acetic acid solution

Jasna Halambek; Ines Cindrić; Antonela Ninčević Grassino

doi:10.1016/j.carbpol.2020.115940

Evaluation of pectin isolated from tomato peel waste as natural tin corrosion inhibitor in sodium chloride/acetic acid solution

Carbohydr Polym. 2020 Apr 15:234:115940. doi: 10.1016/j.carbpol.2020.115940. Epub 2020 Feb 3.

Authors

Jasna Halambek¹, Ines Cindrić¹, Antonela Ninčević Grassino²

Affiliations

¹ Karlovac University of Applied Sciences, Trg J. J. Strossmayera 9, 47000, Karlovac, Croatia.
² Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000, Zagreb, Croatia. Electronic address: aninc@pbf.hr.

PMID: 32070550
DOI: 10.1016/j.carbpol.2020.115940

Abstract

The pectin from tomato peel waste (TPP) was employed as tin corrosion inhibitor with the aim to enhance the knowledge regarding the application of natural inhibitors, instead synthetic, and reducing the waste disposal for value-added biopolymers production. To evaluate the TPP anticorrosion activity the commercial apple pectin (CAP) was also utilised. The gravimetric tests show that the highest inhibitive impact (η) of 75.9 % (CAP) and 73.9 % (TPP) are gained at concentration of 20 g L^-1. By electrochemical, potentiodynamic polarization and impedance spectroscopy measurements, the maximum η (60.05-65.5 %) are reached at lower concentration (4 g L^-1), due to tendency of pectins to form viscous solution. The prominent decreases in current density with the shifts of potential in the cathodic direction revealed that pectins provided cathodic protection of tin surface. Similar inhibition impact of pectins, and fine agreement between applied methods confirmed their suitability against tin corrosion.

Keywords: Acetic acid (PubChem CID: 176); Corrosion inhibitor; Electrochemical technique; Ethanol (PubChem CID: 702); Pectin; Pectin (PubChem CID: 441476); Sodium chloride (PubChem CID: 5234); Tin; Tomato peel waste; Weight loss.