Abstract
Research on corrosion resistance of cast aluminum alloys is reviewed in this article. The effect of the main microstructural features of cast aluminum alloys such as secondary dendrite arm spacing (SDAS), eutectic silicon morphology, grain size, macrosegregation, microsegregation, and intermetallic compounds is discussed. Moreover, the corrosion resistance of cast aluminum alloys obtained by modern manufacturing processes such as semi-solid and additive manufacturing are analyzed. Finally, the protective effects provided by different coatings on the aluminum cast alloys—such as anodized, plasma electrolytic oxidation (PEO), and laser—is reviewed. Some conclusions and future guidelines for future works are proposed.
Highlights
The use of cast aluminum alloys has been growing in recent years mainly because of their low density, good castability, high specific strength, and so on
The results showed a contradictory effect of Cu since on the one hand it caused a decrease in the corrosion rate of both HCl and H2 SO4 (Table S2) while on the contrary, Cu promoted the formation of intergranular corrosion
The electrolyte used for the potentiodynamic polarization corrosion test was 3.5% NaCl solution, and the results show that corrosion resistance increases with high solidification time values
Summary
The use of cast aluminum alloys has been growing in recent years mainly because of their low density, good castability, high specific strength, and so on. A better understanding of the corrosion resistance and protection of aluminum castings is necessary to overcome this drawback. In this regard, the purpose of this article is to carry out an orderly and complete review of the corrosion of cast aluminum alloys. This review article presents a comprehensive review of the most recently published studies dealing with the corrosion of cast aluminum alloys
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