Only recently (since the 1980s) have conservation professionals become interested in the conservation of the most modern of our heritage metals: aluminum. If the first aluminum alloys in the nineteenth century have good corrosion resistance and are usually well preserved, those produced in the twentieth century are often poorly conserved and require conservation treatment. The level of intervention depends strongly on the nature of the artefact, its size and the message to be conveyed. On large industrial objects, damaged original materials are often replaced by new materials. In a few cases the most innovative conservation techniques (laser cleaning, chrono-amperometric, polarization) have been applied to preserve original material through cleaning and stabilization by extraction of aggressive species.