Optimizing maleic anhydride microcapsules size for use in self-healing epoxy-based coatings for corrosion protection of aluminum alloy

2018 ◽  
Vol 69 (9) ◽  
pp. 1257-1267 ◽  
Author(s):  
Chigoziri N. Njoku ◽  
Innocent O. Arukalam ◽  
Weichen Bai ◽  
Ying Li
Keyword(s):  
Aluminum Alloy ◽  
Maleic Anhydride ◽  
Corrosion Protection ◽  
Self Healing

Chitosan-based self-healing protective coatings doped with cerium nitrate for corrosion protection of aluminum alloy 2024

2012 ◽  
Vol 75 (1-2) ◽  
pp. 8-13 ◽  
Author(s):  
J. Carneiro ◽  
J. Tedim ◽  
S.C.M. Fernandes ◽  
C.S.R. Freire ◽  
A.J.D. Silvestre ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Protection ◽  
Protective Coatings ◽  
Cerium Nitrate ◽  
Self Healing ◽  
Aluminum Alloy 2024

Corrosion Protection of Aluminum Alloy 2024-T3 by Vanadate Conversion Coatings

CORROSION ◽  
2004 ◽  
Vol 60 (3) ◽  
pp. 284-296 ◽  
Author(s):  
H. Guan ◽  
R. G. Buchheit
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Protection ◽  
Inductively Coupled Plasma ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Conversion Coating ◽  
Self Healing ◽  
Pitting Potential ◽  
X Ray ◽  
Aluminum Alloy 2024

Abstract In this paper, the formation, chemistry, morphology, and corrosion protection of a new type of inorganic conversion coating is described. This coating, referred to as a vanadate conversion coating (VCC), forms on aluminum alloy substrates in a matter of minutes during simple immersion in aqueous vanadate-based solutions at ambient temperatures. VCCs are yellow in color and conformal across the surface of aluminum alloy 2024-T3 (AA2024-T3 [UNS A92024]) substrates. Auger electron sputter depth profiles and x-ray absorption near-edge spectroscopy show that VCCs formed by a 3-min immersion are 300 nm to 500 nm thick and consist of a mixture of vanadium oxides and other components in the coating bath. In anodic polarization experiments conducted in aerated chloride solutions, VCCs increase the pitting potential and decrease the rate of oxygen reduction. When characterized by electrochemical impedance spectroscopy, VCCs demonstrate a low-frequency impedance between 1 MΩ-cm2 and 2 MΩ-cm2 after 24 h exposure to aerated 0.5 M sodium chloride (NaCl) solutions. In salt spray testing conducted according to ASTM B117, VCCs suppress formation of large pits for more than 168 h. VCCs also appear to be self-healing. Analysis of solution in contact with VCCs by inductively coupled plasma emission spectroscopy indicates that vanadate is released into solution upon exposure. Vanadium deposits were identified by x-ray microchemical analysis on a bare alloy substrate held in close proximity to a vanadate conversion-coated surface, and corrosion resistance of this bare surface was observed to increase during exposure. An important component of VCC formation appears to involve inorganic polymerization of V5+, which leads to the buildup of a film that passivates the surface and inhibits corrosion.

scholarly journals Effect of Plasma Surface Pretreatment on Ce3+-Doped GPTMS-ZrO2 Self-Healing Coatings on Aluminum Alloy

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
N. Kumar ◽  
A. Jyothirmayi ◽  
R. Subasri
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Condensation Reaction ◽  
Salt Spray ◽  
Neutral Salt ◽  
Self Healing ◽  
Surface Pretreatment ◽  
Plasma Surface ◽  
Coating Deposition

A hybrid sol synthesized from an acid-catalyzed hydrolysis and condensation reaction of 3-glycidoxypropyltrimethoxysilane (GPTMS) and zirconium n-propoxide was used as a matrix nanocomposite sol. To this sol, 0.01 M Ce3+ was added as an inhibitor to provide a self-healing coating system. The effect of an atmospheric air plasma surface pretreatment of aluminum alloy substrates prior to coating deposition of Ce3+-doped/undoped GPTMS-ZrO2 sol was studied with respect to corrosion protection. Coatings were generated by a dip coating technique employing a withdrawal speed of 5 mm/s and thermally cured at 130° C for 1 h. The coated Al surfaces were characterized using potentiodynamic polarization studies and electrochemical impedance spectroscopy. They were also subjected to accelerated corrosion testing using neutral salt spray test with 5% NaCl solution after creating an artificial scratch for more than 200 hours to assess the self-healing ability of coatings. It was observed that cerium (III) doping was effective for corrosion protection during long-term exposure to the electrolyte solution, and a plasma surface pretreatment of substrates prior to coating deposition of Ce3+-doped coatings improved the adhesion of coatings that provides enhanced corrosion protection along with self-healing ability exhibited in case of damages/scratches caused in the coating.

Effect of inhibitor loading into nanocontainer additives of self-healing corrosion protection coatings on aluminum alloy A356.0

2017 ◽  
Vol 726 ◽  
pp. 969-977 ◽  
Author(s):  
S. Manasa ◽  
A. Jyothirmayi ◽  
T. Siva ◽  
S. Sathiyanarayanan ◽  
K.V. Gobi ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Protection ◽  
Self Healing

Self-healing performance and corrosion resistance of novel CeO2-sealed MAO film on aluminum alloy

2021 ◽  
Vol 417 ◽  
pp. 127208
Author(s):  
Yue Gong ◽  
Jiwei Geng ◽  
Jie Huang ◽  
Zhe Chen ◽  
Mingliang Wang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Self Healing

scholarly journals Self-healing Ability of Epoxy Vitrimer Nanocomposites Containing Bio-Based Curing Agents and Carbon Nanotubes for Corrosion Protection

2021 ◽  
Author(s):  
Narubeth Lorwanishpaisarn ◽  
Natwat Srikhao ◽  
Kaewta Jetsrisuparb ◽  
Jesper T. N. Knijnenburg ◽  
Somnuk Theerakulpisut ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Corrosion Protection ◽  
Self Healing ◽  
Curing Agents
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