publication . Article . 2014

Cashew Nut Testa Tannin: Assessing its Effects on the Corrosion of Aluminium in HCl

Nnaji, Nnaemeka J. N; Obi-Egbedi, Nelson O; Okoye, Chukwuma O. B;
Open Access
  • Published: 01 Mar 2014 Journal: Portugaliae Electrochimica Acta, volume 32, pages 157-182 (issn: 1647-1571, Copyright policy)
  • Publisher: Portuguese Society of Electrochemistry
Abstract
Cashew nut testa tannin [CASTAN] has been found to inhibit the corrosion of aluminium in hydrochloric acid solutions using gravimetric, thermometric and UV/visible spectrophotometric techniques. CASTAN inhibition was by adsorption on aluminium following Temkin isotherm in 0.1 M HCl and Langmuir isotherm in 0.5 M and 2.0 M HCl at 303 Kelvin. Physical adsorption on aluminium has been proposed in studied HCl solutions; therefore, CASTAN is a cathodic inhibitor. Earlier reports [1] showed CASTAN to contain quercetin, azaleatin, catechin, epicatechin, cyanidin and delphinidin. However, UV/visible spectrophotometric analysis of CASTAN in ethanol reveals quercetin as i...
Subjects
free text keywords: cashew nut testa, cathodic and soft inhibitor, corrosion inhibition, quantum chemical calculations, parallel reactions, Nnaji's inhibition constant, Organic chemistry, Chemistry, Adsorption, Mulliken population analysis, Hydrochloric acid, chemistry.chemical_compound, Inorganic chemistry, Langmuir adsorption model, symbols.namesake, symbols, Reaction mechanism, Aluminium, chemistry.chemical_element, Protonation, HOMO/LUMO
Related Organizations
Powered by OpenAIRE Open Research Graph
Any information missing or wrong?Report an Issue
publication . Article . 2014

Cashew Nut Testa Tannin: Assessing its Effects on the Corrosion of Aluminium in HCl

Nnaji, Nnaemeka J. N; Obi-Egbedi, Nelson O; Okoye, Chukwuma O. B;