Study of ceramic coatings formed by microarc oxidation on Al matrix composite surface

Abstract

Research was conducted on the microstructure, composition, and properties of a ceramic coating deposited on the surface of an aluminium matrix composite (10Al2O3f –ZL109) using microarc oxidation. The influence of different matrixes and reinforcements on the microstructure, properties, and deposition parameters of the ceramic coatings was studied. Both factors showed considerable effects, though the matrix composition had more influence. The results also showed that mullite ceramic coatings can be successfully deposited on the surfaces of aluminium matrix compos ites. The coating was composed of two layers, a porous layer and a dense layer.

Plasma electrolytic oxidation of AMCs

“…The observation of Wang et al [4] that PEO coatings on SiC reinforced AMCs exhibit higher porosity than those on Al 2 O 3 reinforced material can be approved by SEM investigations (figures 3a and 4a). It can be seen from high magnification images that both materials show microscale porosity in close vicinity to the substrate coating interface (figures 3b and 4b) which is a typical phenomenon in PEO processes.…”

“…The incorporation or dissolution of ceramic particles influences microstructure and properties of PEO coatings. Wang et al [4] describe that the growth rate of PEO coatings on AMCs is generally lower compared with the unreinforced matrix alloy due to the high electrical resistivity of the particles. Thermodynamically stable and electrochemically inert alumina (Al 2 O 3 ) particles are incorporated in the coating without restraining the coating hardness, whereas higher porosity is caused by the presence of silicon carbide (SiC) particles.…”

“…Thermodynamically stable and electrochemically inert alumina (Al 2 O 3 ) particles are incorporated in the coating without restraining the coating hardness, whereas higher porosity is caused by the presence of silicon carbide (SiC) particles. According to Wang et al [4], a higher number of cracks and pores develops due to internal stress and the formation of Al 4 C 3 plates at the substrate-coating interface. However, this correlation is not clear as the authors simultaneously varied the matrix alloys and observed that alloy composition also strongly affects coating thickness and porosity.…”

Anti-corrosion film on 2024/SiC aluminum matrix composite fabricated by microarc oxidation in silicate electrolyte

“…With this method, the wear and corrosion protective ceramic films can be synthesized on valve metals such as Al, Mg, Ti [8][9][10][11]. At present, most of papers about MAO focus on the treatment of light metals [12][13][14][15][16][17][18], and the corresponding investigation on metal matrix composites is much less [19,20]. It is of great interest to analyze the influence of SiC reinforcements on the continuity and corrosion behavior of the film.…”

Effect of Micro Arc Oxidation Coatings on Corrosion Resistance of 6061-Al Alloy

“…Micro arc oxidation (MAO) is an emerging ecofriendly coating technique capable of forming ceramic coatings on metals such as Al, Mg, Ti, and their alloys (Ref [1][2][3][4][5]. The ceramic coatings deposited using MAO technique exhibit superior tribological properties (Ref [6][7][8][9].…”