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Anti‐tarnish treatment of brass for coinage (II) color analysis, adsorption model, and quantum chemical calculations
Author(s) -
Liang C.,
Wang P.,
Wu B.,
Huang N.
Publication year - 2011
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200905482
Subject(s) - brass , adsorption , corrosion , tarnish , langmuir adsorption model , materials science , dielectric spectroscopy , gloss (optics) , metallurgy , chemistry , chemical engineering , electrochemistry , inorganic chemistry , nanotechnology , copper , coating , electrode , engineering
Abstract The color and gloss of brass before and after anti‐tarnish treatment were analyzed with color difference meter, and the inhibition effect of 1‐phenyl‐5‐mercapto‐tetrazole (PMTA) film on brass was investigated by means of electrochemical impedance spectroscopy (EIS). It was found that the treatment with PMTA brought few changes to the original color and gloss of brass. The adsorption of PMTA on brass surface obeyed Langmuir adsorption isotherm, it was a spontaneous and exothermic process accompanied by an increase in entropy. Further, quantum chemical calculation was applied to elucidate the corrosion inhibition mechanism of PMTA on brass surface.