Preparation and characterization of electrolytic alumina deposit on austenitic stainless steel

Souad El Hajjaji , Sidi Mohammed El Alaoui (1) , Patrice Simon (1) , Abdellah Guenbour , Ali Ben Bachir , Edith Puech-Costes (2) , Marie-Thérèse Maurette (2) , Lucien Ariès (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 IMRCP - Interactions moléculaires et réactivité chimique et photochimique

Conversion coating modified by alumina has been studied as a way for improving the resistance to thermal oxidation of an austenitic stainless steel. Conversion coating, characterized by a particular morphology and strong interfacial adhesion with the substrate, facilitate the electrochemical deposition of ceramic layers and enhance their adhesion to the substrate. The influence of the current density and treatment time on alumina deposit was studied using statistical experimental designs like Doehlert uniform shell design. After heating, coatings present a continuous composition gradient with refractory compounds at the surface. The behavior at high temperature (1000 8C) of the alumina coating was investigated. The presence of alumina increases the oxidation resistance of an austenitic stainless steel at 1000 8C. The morphology and the chemical composition of the deposit are analyzed. Results on the thermal stability of coating on austenitic stainless steel are presented.

Mots clés: Electrolytic deposit; Statistical experimental design; Surface analysis; Conversion coating; Alumina; Oxidation; Austenitic stainless steel

Domaines: Matériaux

Souad El Hajjaji, Sidi Mohammed El Alaoui, Patrice Simon, Abdellah Guenbour, Ali Ben Bachir, et al.. Preparation and characterization of electrolytic alumina deposit on austenitic stainless steel. Science and Technology of Advanced Materials, 2005, 6 (5), pp.519-524. ⟨10.1016/j.stam.2005.01.004⟩. ⟨hal-03600365⟩