Corrosion protection of aluminum alloy AMg6 from corrosion by conversion cerium-containing coatings
https://doi.org/10.61852/2949-3412-2024-2-2-68-80
Abstract
A solution has been developed for applying protective-adhesive cerium-containing coatings to the surface of the AMg6 aluminum alloy in order to replace the toxic chromating process in the automotive and other industries.
The developed solution contains: 5-10 g/l Ce(NO3)3·6H2O, 30-40 ml/l H2O2 and 0,5-1,5 g/l tannin.
Coatings with the best physical-chemical characteristics are formed in a solution with pH=2-3 at a temperature of 18-25°C and a process duration of 10-15 minutes. The optimum drying temperature is 120-160°C.
The coatings formed under these conditions consist of cerium oxides CeO2, Ce2O3 and aluminum oxide Al2O3. The addition of a tannin (in an amount of 0,5-1,5 g/l) to the working solution leads to a change in the chemical composition of the forming coatings, namely, to the exclusion of CeO2 compounds in their composition. This increases the protective ability of coatings.
The developed solution for the formation of protective-adhesive coatings on aluminum is an alternative to toxic chromating solutions.
About the Authors
A. V. Sundukova
Dmitry Mendeleev University of Chemical Тесhnоlоgy of Russia
Russian Federation
Russian Federation
Miusskaya square, 9, Moscow 125047
A. A. Abrashov
Dmitry Mendeleev University of Chemical Тесhnоlоgy of Russia
Russian Federation
Russian Federation
Miusskaya square, 9, Moscow 125047
N. S. Grigoryan
Dmitry Mendeleev University of Chemical Тесhnоlоgy of Russia
Russian Federation
Russian Federation
Miusskaya square, 9, Moscow 125047
A. I. Hafizova
Dmitry Mendeleev University of Chemical Тесhnоlоgy of Russia
Russian Federation
Russian Federation
Miusskaya square, 9, Moscow 125047
T. A. Vagramyan
Dmitry Mendeleev University of Chemical Тесhnоlоgy of Russia
Russian Federation
Russian Federation
Miusskaya square, 9, Moscow 125047
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Review
For citations:
Sundukova A.V., Abrashov A.A., Grigoryan N.S., Hafizova A.I., Vagramyan T.A. Corrosion protection of aluminum alloy AMg6 from corrosion by conversion cerium-containing coatings. Title in english. 2024;(2):68-80. (In Russ.) https://doi.org/10.61852/2949-3412-2024-2-2-68-80
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