Premium
Corrosion inhibition of layered double hydroxide coating for Mg alloy in acidic corrosive environments
Author(s) -
Xie ZhiHui,
Wu Liang
Publication year - 2020
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.201910995
Subject(s) - corrosion , tafel equation , dielectric spectroscopy , coating , materials science , hydroxide , scanning electron microscope , x ray photoelectron spectroscopy , polarization (electrochemistry) , chemical engineering , fourier transform infrared spectroscopy , alloy , sodium hydroxide , metallurgy , electrochemistry , composite material , chemistry , electrode , engineering
Layered double hydroxide (LDH) shows promising prospects in the application of intelligent coatings to prevent metals from corrosion, while it is not available under acidic conditions. This investigation aims to improve the corrosion resistance of LDH coating in an acidic environment. The surface morphology, structure, and composition of the LDH coating were characterized by scanning electron microscopy (SEM), X‐ray diffraction, Fourier transform infrared spectroscopy, and X‐ray photoelectron spectroscopy, respectively. The corresponding corrosion inhibition was evaluated by electrochemical methods, including electrochemical impedance spectroscopy and Tafel curves. The significant increase in coating resistance and charge transfer resistance and the obvious decrease in corrosion current density demonstrate the remarkable improvement of the MgAl–LDH coating in corrosion inhibition. The optical pictures and SEM images show that the coating is corroded severely when sodium dodecyl benzene sulfonate (SDBS) is not added, while it is protected competently without any signs of corrosion after polarization in HCl solutions containing SDBS, which enables the application of a MgAl–LDH coating under an HCl‐corrosive medium.