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Corrosion electrochemical behaviors of silane coating coated magnesium alloy in NaCl solution containing cerium nitrate
Author(s) -
Luo F.,
Li Q.,
Zhong X. K.,
Gao H.,
Dai Y.,
Chen F. N.
Publication year - 2012
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.201005706
Subject(s) - cerium nitrate , cerium , corrosion , materials science , silane , coating , magnesium alloy , dielectric spectroscopy , magnesium , alloy , electrochemistry , metallurgy , inorganic chemistry , polarization (electrochemistry) , chemical engineering , chemistry , composite material , electrode , engineering
Sol–gel coatings cannot provide adequate corrosion protection for metal/alloys in the corrosive environments due to their high crack‐forming potential. This paper demonstrates the possibility to employ cerium nitrate as inhibitor to decrease the corrosion development of sol–gel‐based silane coating on the magnesium alloy in NaCl solution. Cerium nitrate was added into the NaCl solution where the silane coating coated magnesium alloy was immersed. Scanning electron microcopy (SEM) was used to examine surface morphology of the silane coating coated magnesium alloy immersed in NaCl solutions doped and undoped with cerium nitrate. The corrosion electrochemical behaviors were investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests. The results showed that the introduction of cerium nitrate into NaCl solution could effectively inhibit the corrosion of the silane coating coated magnesium alloy. Moreover, the influence of concentration of cerium nitrate on the corrosion inhibition and the possible inhibiting mechanism were also discussed in detail.