Cr$^{VI}$-Free anti-corrosion protection and adherence promotion through the grafting of organic underlayer with a diazonium salt

Aurélien Doublet (1) , Christophe Not (2) , Guy Deniau (1) , Renaud Cornut (1)

1 LICSEN UMR 3685 - Laboratoire Innovation en Chimie des Surfaces et NanoSciences
2 Protec Industrie

Hexavalent chromium (Cr$^{VI}$) which is at the basis of most of the treatments used to prepare the metallic surfaces before painting in aeronautic, is classified as carcinogenic, mutagenic and reprotoxic (CMR). The time for using Cr$^{VI}$ will soon pass, and alternatives must now be found. For this purpose, PROTEC Industry, a major actor for technical surfaces treatment in aeronautics is associated with CEA, a public research agency recognized among others for its innovations in surface modification. The strategy that we selected is based on the grafting of an organic underlayer, the anchoring of the layer to the metal being ensured by a specific chemical function bared by the precursor, namely a diazonium. With the aim of adapting the process to the aeronautic branch, CEA and PROTEC have shared their knowledge, manpower, device and knowhow through the creation of a common laboratory supported by ANR and ANRT, in 2012.

Domaines: Matériaux

Aurélien Doublet, Christophe Not, Guy Deniau, Renaud Cornut. Cr$^{VI}$-Free anti-corrosion protection and adherence promotion through the grafting of organic underlayer with a diazonium salt. 2nd Metallic Materials and Processes : Industrial Challenges, Oct 2017, Deauville, France. ⟨cea-02341492⟩