高强铝合金的腐蚀与防护研究进展

High-strength aluminum alloy has low density (2.7~2.9 g?cm?3), high tensile strength (500~700 MPa) and good plasticity (8%-15% elongation), which can withstand the mechanical requirements under complex load conditions and become an indispensable basic material in key fields such as aerospace, transportation, electric power communication, national defense and military industry. However, the addition of copper, magnesium, zinc and other elements in high-strength aluminum alloy will significantly improve the strength of the alloy and greatly reduce its corrosion resistance. The corrosion of high-strength aluminum alloy will not only weaken the mechanical properties of the material, but may even induce catastrophic accidents, resulting in huge economic losses and potential safety hazards. In this paper, the common corrosion types and common protection methods of high-strength aluminum alloy are summarized, and its future development direction is prospected.