Improvement of Adhesion Properties and Corrosion Resistance of Sol-Gel Coating on Zinc

Pauline Savignac (1) , Marie-Joëlle Menu (2) , Marie Gressier (2) , Bastien Denat (1) , Yacine Khadir (1) , Stephan Manov (1) , Florence Ansart (2)

1 VM Building Solutions (FRANCE)
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Corrosion is a major problem for durability of many metals and alloys. Among the efficient classical surface treatments, chromate-based treatments must be banished from industrial use due to their toxicity. At the same time, sol-gel routes have demonstrated high potential to develop an efficient barrier effect against aggressive environments. By this process, the anti-corrosion property can be also associated to others in the case of the development of multi-functional hybrid coatings. In this paper, the main goal is precisely to improve both the corrosion resistance and the adhesion properties of phosphated zinc substrates by the deposition of a hybrid (organic-inorganic) sol-gel layer. To reach this double objective, a choice between two formulations 3-glycidoxypropyltrimethoxysilane (GPTMS)/aluminum-tri-sec-butoxide (ASB) and 3-(trimethoxysilyl) propylmethacrylate (MAP)/tetraethylorthosilicate (TEOS) was firstly made based on the results obtained by microstructural characterizations using SEM, optical analysis, and mechanical characterization such as shock and/or scratch tests (coupled to climatic chamber and salt spray exposure). Several investigations were performed in this study, and the best formulation and performances of the system were obtained by adding a new precursor (1-[3-(trimethoxysilyl)propyl]ureido-UPS) under controlled conditions, as detailed in this paper.

Mots clés: Sol-gel; Hybrid materials; Corrosion; Adhesion; Coating; Zinc

Domaines: Matériaux

Pauline Savignac, Marie-Joëlle Menu, Marie Gressier, Bastien Denat, Yacine Khadir, et al.. Improvement of Adhesion Properties and Corrosion Resistance of Sol-Gel Coating on Zinc. Molecules, 2018, 23 (5), pp.1079. ⟨10.3390/molecules23051079⟩. ⟨hal-02335750⟩