Premium
Effect of surface treatments based on self‐assembling molecules and cerium coatings on the AA3003 alloy corrosion resistance
Author(s) -
Banczek E. P.,
Moraes S. R.,
Assis S. L.,
Costa I.,
Motheo A. J.
Publication year - 2013
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.201106205
Subject(s) - cerium , corrosion , materials science , conversion coating , alloy , dielectric spectroscopy , coating , adsorption , metallurgy , polarization (electrochemistry) , electrochemistry , chemical engineering , composite material , chemistry , electrode , organic chemistry , engineering
This work presents the effects of a cerium conversion coating, self‐assembling molecules (SAM) treatment, and a combination of these two treatments on the corrosion resistance of the AA3003 alloy. The results were compared to that of a conversion coating treatment with hexavalent chromium (Cr VI). The corrosion resistance of the surface‐treated AA3003 alloy samples was investigated by electrochemical impedance spectroscopy and anodic polarization curves in 0.5 mol/L sodium sulfate solution with pH adjusted to 4.0. The results showed that the SAM treatment offered better corrosion protection for the AA3003 alloy than that provided by cerium conversion coating. The combination of cerium conversion and SAM treatments improved the corrosion resistance of the AA3003 alloy due to SAM adsorption on the alloy substrate exposed at the defects in the cerium conversion layer.