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Adsorption Effect of Five‐Membered and Six‐Membered Alicyclic Amine‐Derived Mannich Bases on Mild Steel Surface in 1.0 M HCl
Author(s) -
Nesaian Ugin Inbaraj,
Prabhu Ganesan Venkatesa
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701991
Subject(s) - acetamide , tafel equation , adsorption , chemistry , alicyclic compound , chemisorption , mannich base , corrosion , electrochemistry , langmuir adsorption model , amine gas treating , mannich reaction , inorganic chemistry , medicinal chemistry , organic chemistry , electrode , catalysis
Two new Mannich bases N‐(3‐(benzo[d][1, 3]dioxol‐5‐yl(pyrrolidin‐1‐yl)methyl)‐4‐hydroxyphenyl)acetamide ( I 1 ) and N‐(3‐(benzo[d][1, 3]dioxol‐5‐yl(morpholino)methyl)‐4‐hydroxyphenyl) acetamide (I 2 ) are synthesised and evaluated their corrosion inhibition behaviour through weight loss measurements, electrochemical, quantum chemical and surface analytical studies. Tafel studies revealed that the inhibitors are found to be mixed type. EIS studies confirmed that corrosion process is controlled through charge transfer process. The adsorption of inhibitors I 1 and I 2 follows Langmuir adsorption isotherm and ΔG ads values suggest that both physorption and chemisorption are possible. Surface studies show that in the presence of inhibitors, smoother surface is obtained compared to blank. I 1 has higher inhibition efficiency (50 μM −98%) than I 2 (50 μM −94%) which is correlated with the theoretical studies.