scholarly journals Self-Healing Properties of Cerium-Modified Molybdate Conversion Coating on Steel

2021 ◽  
Author(s):  
Rimantas Ramanauskas ◽  
Aliona Kirdeikiene ◽  
Olga Girciene ◽  
Laima Gudaviciute ◽  
Vitalija Jasulaitiene ◽  
...  
Keyword(s):  
Protective Coatings ◽  
Structural Characteristics ◽  
Element Distribution ◽  
Conversion Coating ◽  
Oxidation States ◽  
Structural Defects ◽  
Self Healing ◽  
Depth Profiles ◽  
Carbon Steel Surface ◽  
Voltammetric Measurements

A phosphate/molybdate and cerium-modified phosphate/molybdate conversion coatings were deposited on a carbon steel surface and their protective and self-healing abilities were evaluated. Surface morphology and inner structure of the coatings were examined using FE-SEM-FIB and TEM techniques, chemical composition and element distribution depth profiles in conversion layers were determined using EDX measurements, whereas XPS was applied for the analysis of Mo and Ce oxidation states. Voltammetric measurements and EIS were performed to assess the corrosion behavior of the samples. The higher protective and stronger self-healing abilities were found for phosphate/molybdate/cerium conversion coating deposited in a sulphate-containing solution. This was attributed to higher values of both: total cerium and Ce(IV) content in the conversion layer as well as to lower number of structural defects in the coating. It was demonstrated that the micro-structural characteristics of protective coatings are also important in determining self-healing abilities.

scholarly journals Self-Healing Properties of Cerium-Modified Molybdate Conversion Coating on Steel

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 194
Author(s):  
Aliona Kirdeikiene ◽  
Olga Girčiene ◽  
Laima Gudavičiūte ◽  
Vitalija Jasulaitiene ◽  
Algirdas Selskis ◽  
...  
Keyword(s):  
Structural Characteristics ◽  
Element Distribution ◽  
Conversion Coating ◽  
Structural Defects ◽  
Homogeneous Distribution ◽  
Self Healing ◽  
Carbon Steel Surface ◽  
Coating Morphology ◽  
The Relationship ◽  
Chromium Phosphate

Environmentally friendly alternatives to chromium—phosphate/molybdate and cerium-modified phosphate/molybdate conversion coatings—were deposited on a carbon steel surface. Different surface analytic techniques were applied to obtain complementary information on the composition, element distribution morphology and inner structure of the coatings in order to establish the relationship between coating properties and corrosion performance. The higher protective and stronger self-healing abilities were found for phosphate/molybdate/cerium conversion coating deposited in a sulphate-containing solution. The protective barrier strength was found to be related with certain aspects of the coating morphology such like homogeneous distribution of fine crystallites and, hence, lower number of structural defects. The self-healing ability depended on both, the composition (higher amount of Ce(IV)) and micro-structural characteristics, such as defectiveness, of the conversion layer.

scholarly journals Self-healing corrosion protective coatings based on micro/nanocarriers: A review

2021 ◽  
Author(s):  
Tong Liu ◽  
Lingwei Ma ◽  
Xin Wang ◽  
Jinke Wang ◽  
Hongchang Qian ◽  
...  
Keyword(s):  
Protective Coatings ◽  
Self Healing

Self-healing protective coatings with “green” chitosan based pre-layer reservoir of corrosion inhibitor

2011 ◽  
Vol 21 (13) ◽  
pp. 4805 ◽  
Author(s):  
M. L. Zheludkevich ◽  
J. Tedim ◽  
C. S. R. Freire ◽  
S. C. M. Fernandes ◽  
S. Kallip ◽  
...  
Keyword(s):  
Corrosion Inhibitor ◽  
Protective Coatings ◽  
Self Healing

Physico-Chemical Characterisation of Protective Coatings and Self Healing Processes

2016 ◽  
pp. 241-298
Author(s):  
Anthony E. Hughes ◽  
Sam Yang ◽  
Berkem Oezkaya ◽  
Ozlem Ozcan ◽  
Guido Grundmeier
Keyword(s):  
Protective Coatings ◽  
Self Healing ◽  
Physico Chemical ◽  
Healing Processes

scholarly journals Fabrication of ZnO@Ag3PO4 Core-Shell Nanocomposite Arrays as Photoanodes and Their Photoelectric Properties

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1254 ◽  
Author(s):  
Yi ◽  
Li ◽  
Wu ◽  
Chen ◽  
Yang ◽  
...  
Keyword(s):  
Performance Test ◽  
Structural Characteristics ◽  
Energy Dispersive Spectrometer ◽  
Zno Nanorods ◽  
Element Distribution ◽  
Core Shell ◽  
Photoelectric Properties ◽  
Component Test ◽  
Photoelectric Performance ◽  
Light Reflectance

In this study, we combine the methods of magnetron sputtering, hydrothermal growth, and stepwise deposition to prepare novel ZnO@Ag3PO4 core-shell nanocomposite arrays structure. Through scanning electron microscope (SEM) topography test, energy dispersive spectrometer (EDS) element test and X-ray diffractometry (XRD) component test, we characterize the morphology, element distribution and structural characteristics of ZnO@Ag3PO4 core-shell nanocomposite arrays structure. At the same time, we test the samples for light reflectance, hydrophilicity and photoelectric performance. We find that after deposition of Ag3PO4 on ZnO nanorods, light reflectance decreases. As the time of depositions increases, light reflectance gradually decreases. After the deposition of Ag3PO4, the surface of the sample shows super hydrophilicity, which is beneficial for the photoelectric performance test. Through the optical transient response test, we find that the photo-generated current reaches a maximum when a small amount of Ag3PO4 is deposited. As the time of depositions of Ag3PO4 increases, the photogenerated current gradually decreases. Finally, we conducted an alternating current (AC) impedance test and also verified the correctness of the photocurrent test. Therefore, the structure is expected to be prepared into a photoanode for use in fields such as solar cells.

Structural variations in strained crystalline multilayers

1994 ◽  
Vol 9 (8) ◽  
pp. 2190-2197 ◽  
Author(s):  
J. Hoekstra ◽  
H. Yan ◽  
G. Kalonji ◽  
H. Jónsson
Keyword(s):  
Structural Changes ◽  
Elevated Temperatures ◽  
Lattice Mismatch ◽  
Structural Characteristics ◽  
Binding Energies ◽  
Structural Defects ◽  
Interatomic Potentials ◽  
Structural Variations ◽  
Common Neighbor ◽  
Hcp Structure

We present a computer simulation study of thin crystalline multilayers constructed from two fcc solids with differing lattice constants and binding energies. Initially the two solids have the same orientation, and the interface is perpendicular to the common [100] direction. We then minimize the energy of the system at zero temperature or equilibrate it at a finite temperature. Both materials are described by Lennard-Jones interatomic potentials. A novel technique for analyzing local atomic ordering, common neighbor analysis, is used to identify structural characteristics in these systems. As we gradually vary the lattice mismatch between the two solids, several structural changes are observed in the layers of smaller atoms after energy minimization. At a mismatch larger than 14%, the layers transform into the hep structure, while at smaller mismatches extended structural defects are generated. At elevated temperatures, the hcp structure is transformed back to fcc, and the structure defects disappear.

scholarly journals Self-healing mechanisms in smart protective coatings: A review

2018 ◽  
Vol 144 ◽  
pp. 74-88 ◽  
Author(s):  
Fan Zhang ◽  
Pengfei Ju ◽  
Mengqiu Pan ◽  
Dawei Zhang ◽  
Yao Huang ◽  
...  
Keyword(s):  
Protective Coatings ◽  
Self Healing
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