Open AccessINHIBITORY ACTION OF PAPAYA SEED EXTRACTS ON THE CORROSION OF CARBON STEEL IN 1 MOL L−1HCl SOLUTION
Author(s) -
V. V. Torres,
Gabriela Borges Cabral,
Ana Carolina Gomes da Silva,
Kelly Cristina Ferreira,
Eliane D’Elia
Publication year - 2016
Publication title -
química nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.214
H-Index - 73
eISSN - 1678-7064
pISSN - 0100-4042
DOI - 10.5935/0100-4042.20160046
Subject(s) - corrosion , carbon steel , carbon fibers , mole , action (physics) , nuclear chemistry , chemistry , materials science , organic chemistry , physics , composite material , quantum mechanics , composite number
The effect of two papaya seed extracts (infusion and acid extracts) on the corrosion of carbon steel in 1 mol L-1 HCl was examined. The efficiency for inhibiting the corrosion of C-steel in 1 mol L-1 HCl increased with the extract concentration and decreased slightly with the temperature. The inhibitory property of the extract is discussed in terms of the mechanism by which its components adsorb onto the C-steel surface decreasing the active surface area. This adsorption process obeyed a Langmuir adsorption isotherm. The infusion extract which presented more phenolic compounds than the acid extract showed higher inhibition efficiency. The apparent activation energy (Ea) for the dissolution of C-steel slightly increased when the infusion extract was used