Published January 2021 | Version v1
Journal article Metadata-only

Superior corrosion protection and adhesion strength of epoxy coating applied on AZ31 magnesium alloy pre-treated by PEO/Silane with inorganic and organic corrosion inhibitors

Creators

  • 1. Department of Materials Engineering, Tarbiat Modares University, Tehran (Iran, Islamic Republic of)
  • 2. Department of Surface Coatings and Corrosion, Institute for Color Science and Technology (ICST), Tehran (Iran, Islamic Republic of)
  • 3. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran (Iran, Islamic Republic of)

Description

Highlights: • PEO/Silane containing inhibitors as pretreatment of epoxy layer. • Studying active corrosion protection of inhibitors by EIS and EN tests. • Best protective properties for three-layer coating with Ce and 8-HQ inhibitors. • Improvement of wet adhesion strength of three-layer coating with Ce and 8-HQ. PEO/Silane/Epoxy coating system with inorganic inhibitor (Ce(NO3)3) in the plasma electrolytic oxidation (PEO) layer as well as organic inhibitors in the silane layer was investigated in terms of active corrosion protection properties and adhesion strength. The results of electrochemical impedance spectroscopy (EIS), electrochemical noise (EN) and pull-off tests indicated that the presence of the 8-Hydroxyquinoline (8-HQ) organic inhibitor provides the optimal performance for coating systems. The formation of Ce(OH)3 in the PEO coating structure and the complex chelate of Mg(HQ)2 in the silane layer lead to the creation of active corrosion protection properties for the coating systems.

Availability note (English)

Available from http://dx.doi.org/10.1016/j.corsci.2020.109065

Additional details

Identifiers

DOI
10.1016/j.corsci.2020.109065;
PII
S0010938X20309392;

Publishing Information

Journal Title
Corrosion Science
Journal Volume
178
Journal Page Range
vp.
ISSN
0010-938X
CODEN
CRRSAA

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
54016664
Subject category
S36: MATERIALS SCIENCE; S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Descriptors DEI
ADHESION; CERIUM HYDROXIDES; CHELATES; COATINGS; CORROSION INHIBITORS; CORROSION PROTECTION; ELECTROCHEMISTRY; EPOXIDES; IMPEDANCE; LEAD; MAGNESIUM ALLOYS; NITRATES; NITROGEN OXIDES; OXIDATION; OXINE; PERFORMANCE; PLASMA; PLASMA SWITCHES; SILANES; SPECTROSCOPY
Descriptors DEC
ALLOYS; AROMATICS; AZAARENES; AZINES; CERIUM COMPOUNDS; CHALCOGENIDES; CHEMICAL REACTIONS; CHEMISTRY; COMPLEXES; ELECTRICAL EQUIPMENT; ELEMENTS; EQUIPMENT; HETEROCYCLIC COMPOUNDS; HYDRIDES; HYDROCARBONS; HYDROGEN COMPOUNDS; HYDROXIDES; HYDROXY COMPOUNDS; METALS; NITROGEN COMPOUNDS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; ORGANIC SILICON COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PYRIDINES; QUINOLINES; RARE EARTH COMPOUNDS; SILICON COMPOUNDS; SWITCHES

Optional Information

Copyright
Copyright (c) 2020 Elsevier Ltd. All rights reserved.