Abstract
Aluminum matrix composites reinforced with silicon carbide particles (SiCp) were deposited by laser cladding on AA6082 aluminum alloy. Different compositions of the matrix of the composites coating were used and different amounts of Si and Ti were added to a base of Al-12Si in order to control the reactivity between molten aluminum and SiCp during laser cladding. The corrosion behavior of the coatings deposited was evaluated in 3.5 wt.% NaCl solution using gravimetric analyses and electrochemical polarization tests. The corrosion products observed were Al(OH)3 and Al2O3, and they formed a layer that limited the evolution of corrosion. However, the presence of discontinuities in it reduced the corrosion resistance of the coating. The corrosion mechanisms were different depending on the coating composition. The addiction of Ti to the alloy allowed for better corrosion behavior for the composite coating than that of the aluminum substrate.
Highlights
The need of weight reduction and increased mechanical properties, mainly in aerospace and automobile sectors, have stimulated engineers to develop new material combinations with high mechanical properties [1,2]
Aluminum matrix composites reinforced with SiC particles (SiCp ) have better tribological properties than the equivalent alloys [3,4]
The cross section of the different Al/SiCp coatings deposited on AA6082 by laser cladding is Theincross section of images the different
Summary
The need of weight reduction and increased mechanical properties, mainly in aerospace and automobile sectors, have stimulated engineers to develop new material combinations with high mechanical properties [1,2]. Aluminum matrix composites reinforced with SiC particles (SiCp ) have better tribological properties than the equivalent alloys [3,4]. The possibility of fabricating Al/SiCp coatings on aluminum could be a possible solution to obtain light components with high tribological properties [5,6,7,8]. The incorporation of a ceramic phase into an aluminum matrix can change its corrosion behavior. Several factors determine the corrosion behavior of metal-matrix composites such as the composition of the matrix alloy and its microstructure, the reinforcement dispersion and the technique used to fabricate the composite [9]. Laser cladding is an effective fabrication process to obtain composite coatings as it provides compact coatings with high adhesion to the substrates and it has a very high versatility [10,11]
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