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Investigation on Corrosion Resistance and Formation Mechanism of a P–F–Zr Contained Micro-Arc Oxidation Coating on AZ31B Magnesium Alloy Using an Orthogonal Method
- Source :
- Coatings, Volume 9, Issue 3, Coatings, Vol 9, Iss 3, p 197 (2019)
- Publication Year :
- 2019
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2019.
-
Abstract
- In this study, the synergistic effects of NH4HF2, sodium phytate (Na12Phy), K2ZrF6, and treatment time on corrosion resistance of a micro-arc oxidation (MAO) treated magnesium alloy and the entrance mechanism of P, F, and Zr into anodic coatings were investigated using an orthogonal method. In addition, the roles of NH4HF2, Na12Phy, and K2ZrF6 on coating development were separately studied. The results show that NH4HF2 and Na12Phy, the corrosion inhibitors of magnesium alloys, are beneficial but K2ZrF6 is harmful to developing anodic coatings. The corrosion resistance of MAO coatings is synergistically determined by coating characteristics, though the coating thickness plays a main role. Na12Phy significantly improves but NH4HF2 decreases the corrosion resistance of MAO coatings, while excess high K2ZrF6 is harmful to the coating corrosion resistance. Treatment time can increase the coating thickness but is the least important factor in corrosion resistance. During MAO, NH4HF2, Na12Phy, and K2ZrF6 take part in coating formation, causing P, F, and Zr to compete with each other to enter into anodic coatings.
- Subjects :
- Materials science
chemistry.chemical_element
zirconium
02 engineering and technology
engineering.material
010402 general chemistry
01 natural sciences
Corrosion
Coating
fluorine
Materials Chemistry
Magnesium alloy
Zirconium
corrosion resistance
Magnesium
Surfaces and Interfaces
magnesium alloy
021001 nanoscience & nanotechnology
0104 chemical sciences
Surfaces, Coatings and Films
Anode
micro-arc oxidation
chemistry
Chemical engineering
lcsh:TA1-2040
engineering
Fluorine
0210 nano-technology
lcsh:Engineering (General). Civil engineering (General)
Orthogonal method
Subjects
Details
- Language :
- English
- ISSN :
- 20796412
- Database :
- OpenAIRE
- Journal :
- Coatings
- Accession number :
- edsair.doi.dedup.....0595b4f1cb385d9ab7419ddd9dae24b6
- Full Text :
- https://doi.org/10.3390/coatings9030197