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Adsorption, Thermodynamic, and Experimental Studies of Corrosion Inhibitor of Tin in 0.2 M Maleic Acid by Hydrogen Phosphate Ions (HPO 4 2− )
Author(s) -
Ait Addi Brahim,
Ait Addi Abdelaziz,
Shaban Abdul,
Ait Addi ElHabib,
Hamdani Mohamed
Publication year - 2021
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.202060406
Subject(s) - adsorption , tin , corrosion , langmuir adsorption model , inorganic chemistry , electrochemistry , chemistry , polarization (electrochemistry) , corrosion inhibitor , ion , phosphate , hydrogen , maleic acid , nuclear chemistry , electrode , organic chemistry , copolymer , polymer
The inhibition efficiency of H 2 PO 4 2− ions against tin corrosion in 0.2 M maleic acid is studied using electrochemical methods, surface analytical methods, and thermodynamic analysis. The potentiodynamic polarization plots showed the presence of an active/passive transition state of the tin electrode. The EIS measurements confirmed that the inhibition efficiency of H 2 PO 4 2− increased by increasing the concentration (η=81 % at C inh =2.10 −2 M) and decreased by rising the temperature. The polarization tests demonstrated that the inhibitor performs as a cathodic‐type. The adsorption of the inhibitor was spontaneous and followed the Langmuir adsorption isotherm. A model of the inhibition mechanism was suggested.