Alternative black coatings prepared on aluminium alloy 1050

ABSTRACT

The present study investigated the preparation and characterisation of alternative black anodic films on aluminium alloy 1050 using three different inorganic colouring processes. The colouring process was performed via the standard chemical reaction and two alternative mechanisms, i.e. electrochemical reaction or a combination of electrochemical and chemical reactions. Black anodic films with high thermo-optical properties (α_s≥ 0.90 and ε_n≥ 0.90) were successfully obtained using all three processes. Differences in chemical content and location of the Co-based pigments in the coatings were highlighted and explained according to the colouring reaction mechanisms.

KEYWORDS:

• Aluminium
• black coatings
• anodising
• inorganic colouring
• Co-based pigments
• thermo-optical properties

Acknowledgements

The present work was conducted as a part of the DOSIMAT project.

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Laurent Arurault http://orcid.org/0000-0003-2364-2236

Additional information

Funding

The French Ministry of Industry (DIRECCTE) and the ‘Préfecture de Région Midi-Pyrénées’ are gratefully acknowledged for the financial support they provided for this project.