2218 aluminum alloy is an alloy in the wrought aluminum-copper family (2000 or 2xxx series). It is one of the most complex grades in the 2000 series, with at least 88.4% aluminum by weight. Unlike most other aluminum-copper alloys, 2218 is a high work-ability alloy, with relatively low for 2xxx series alloy yield strength of 255 MPa. Despite being highly alloyed, it has a good corrosion and oxidation resistance due to sacrificial anode formed by magnesium inclusions, similar to marine-grade 5xxx series alloys. Although 2218 is wrought alloy, owing to granular structure it can be used in casting and been precisely machined after casting. It is easy to weld, coat, or glue.
Prodsuct Parameter
Chemical Composition | |||||
| Alloy | Si | Fe | Cu | Mn | Mg |
| 2218 | 0.9 | 1 | 3.5~4.5 | 0. 20 | 1.2~1.8 |
| Cr | Ni | Zn | Each | Total | Al. |
| 0. 10 | 1.7~2.3 | 0. 25 | 0.05 | 0. 15 | Remainder |
Prodsuct Applications
Good workability, thermal conductivity, and dimensional stability make 2218 alloy a material of choice whenever high-precision parts subject to thermal shocks (especially piston engine cylinders and cylinder heads) are needed.