Title£º Microstructure of coupled Al/gray cast iron obtained by molding and its effect on mass loss
Author£º *Mohamed Bouitna1, Naïma Boutarek-Zaourar1, Samir Mansour1, Samir Mourad Chentouf 2, Eric Mossang3
Address£º 1. Laboratory of Materials Technology, Faculty of Mechanical Engineering and Process Engineering, University of Science and Technology Houari Boumediene, B.P. 32 El Alia, 16111 Algiers, Algeria 2. Department of Mechanical Engineering, School of Technology Superior, 1100 Notre-Dame Street West, Montreal, Quebec H3C 1K3, Canada 3. NEEl Institute, National Center for Scientifi c Research, 25, rue des Martyrs, BO 166, 38042, Grenoble Cedex, France
Key words£º gray cast iron; aluminum; coating; treatment in the mold; mass loss
CLC Nmuber£º TG143.2
Document Code£º A
Article ID£º 1672-6421(2018)05-378-06
Abstract£º

This study aims to consolidate the surface of gray cast iron with aluminum deposition by developing a method that combines the preparation and surface treatment in a single operation. The effect of the wall thickness of the castings on the microstructure of the formed layers was studied, and two thicknesses, 8 mm and 25 mm, were studied. The formation of a continuous and homogeneous rich aluminum layer on the surface of the cast iron was observed. The formed layer is composed of two successive zones identifi ed as two proeutectoid phases FeAl+FeAl/FeAl2 and single-phase FeAl, which signifi cantly increases the surface hardness. Furthermore, this change in surface composition makes it possible to reduce the mass of the immersed samples in a 1 M hydrochloric acid solution during different exposure times (1 to 4 days). Consequently, a clear improvement in the corrosion resistance of the treated layers is highlighted.