Electrochemically Phosphating of Aluminum Surfaces in -Containing Solutions

Electrochemically Phosphating of Aluminum Surfaces in -Containing Solutions

Effects of concentration (2.0, 4.0, 7.0 and 11.0 vol %) and operating temperature (20.0, 40.0 and 60.0°C) on phosphate coatings formed on aluminum (AA1050) surfaces by cathodic electrochemical polarization (0.1, 0.4 and 0.6 A dm –2 ) in solutions containing ammonium and sodium phosphates, promoting...

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Bibliographic Details
Published in:Protection of metals and physical chemistry of surfaces Vol. 57; no. 4; pp. 796 - 805
Main Authors: Fachikov, L. B., Ilieva, G. P., Ivanova, D. I.
Format: Journal Article
Language:English
Published: Moscow Pleiades Publishing 2021
Springer Nature B.V
Subjects:
Aluminum
Cathodic coating (process)
Cathodic polarization
Characterization and Evaluation of Materials
Chemical compounds
Chemistry and Materials Science
Corrosion and Coatings
Corrosion resistance
Electrode polarization
Gravimetric analysis
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials and Coatings
Materials Science
Metallic Materials
New Substances
Operating temperature
Phosphate coatings
Phosphating (coating)
Photoelectrons
Protective coatings
Sodium phosphate
Tribology
aluminum
phosphating
aluminum alloys
conversion coatings
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Summary:Effects of concentration (2.0, 4.0, 7.0 and 11.0 vol %) and operating temperature (20.0, 40.0 and 60.0°C) on phosphate coatings formed on aluminum (AA1050) surfaces by cathodic electrochemical polarization (0.1, 0.4 and 0.6 A dm –2 ) in solutions containing ammonium and sodium phosphates, promoting ions, inorganic activators, buffers, softeners, as well as surfactants, have been studied. The process kinetics, coating elements, related microstructure and the corrosion resistance (in 0.6 M NaCl) have been evaluated by various analyzes such as gravimetric and electrochemical methods, SEM with EDX-analyzes, AFM and X-ray photoelectron spectroscopy, respectively. The main elements in phosphate coatings are phosphorus, oxygen, molybdenum, nickel. Assumptions about the probable chemical compounds have been discussed.
ISSN:2070-2051
2070-206X
DOI:10.1134/S2070205121040092