A comparative study on corrosion inhibitive effect of nitrate and phosphate intercalated Zn-Al- layered double hydroxides (LDHs) nanocontainers incorporated into a hybrid silane layer and their effect on cathodic delamination of epoxy topcoat

•Zn-Al- layered double hydroxides were successfully doped with phosphate ions.•Phosphate loaded nanocontainers showed better inhibition effect than nitrate one and formed passive film on steel surface.•Silane film including Zn-Al-PO43− nanocontainer significantly reduced cathodic delamination of epo...

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Bibliographic Details
Published in:Corrosion science 2017-02, Vol.115, p.159-174
Main Authors: Alibakhshi, E., Ghasemi, E., Mahdavian, M., Ramezanzadeh, B.
Format: Article
Language:English
Subjects:
A. Mild steel
Aluminum
Anion exchanging
B. EIS
B. XPS
C. Neutral inhibition
C. Polymer coatings
Chemical compounds
Coating
Comparative studies
Corrosion
Corrosion effects
Corrosion inhibitors
Corrosion tests
Delamination
Hydroxides
Ion exchange
Protective coatings
Sodium chloride
Spectroscopic analysis
Spectrum analysis
Spices
Steel
Surface analysis (chemical)
X ray photoelectron spectroscopy
Zinc
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Summary:•Zn-Al- layered double hydroxides were successfully doped with phosphate ions.•Phosphate loaded nanocontainers showed better inhibition effect than nitrate one and formed passive film on steel surface.•Silane film including Zn-Al-PO43− nanocontainer significantly reduced cathodic delamination of epoxy coating on steel.•The improvement of self-healing ability of the coatings loaded with Zn-Al-PO43− was much higher than Zn-Al-NO3−. This study aims at synthesis and characterization of Zn-Al-PO43− and Zn-Al-NO3− layered double hydroxides (LDHs) through employing FE-SEM, EDS and X-ray photoelectron spectroscopy (XPS) analyses. The smart release ability of the inhibitive spices from LDHs were checked by EIS, polarization and surface analysis tests in 3.5wt.% NaCl solution. A two-layer coating system consisting of silane primer filled with LDHs and epoxy-polyamide top coat were applied on steel and then the active inhibition capability of the coatings was investigated. The addition of Zn-Al-PO43− LDH to the silane coating provides efficient inhibition behavior by releasing PO43− anions through ion exchange process.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2016.12.001