CORROSION RESISTANT CASTING ALUMINUM ALLOY Russian patent published in 2018 - IPC C22C21/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy of materials based on aluminum and can be used for the manufacture of castings for the production of critical parts working in a corrosive environment at temperatures up to 300–350 °C. Foundry alloy based on aluminum contains, by weight, %: calcium 2.0–2.6, iron 0.3–0.5, silicon 0.1–0.5, manganese 0.8–1.2, zirconium 0.2–0.3, scandium 0.08–0.12, aluminum – the rest, moreover, the alloy contains zirconium and scandium in its structure in the form of nanoparticles of the Al₃(Zr, Sc) with a crystal lattice L1₂, having an average size of not more than 20 nm. Alloy after soaking in aqueous solution of 3 % NaCl + 0.3 % H₂O₂ for up to 3 days it has the following tensile properties: temporary resistance (σ_t) not less than 240 MPa, yield strength (σ_0.2) not less than 160 MPa, relative elongation (δ) – not less than 3 %.

EFFECT: creating a new economically alloyed corrosion-resistant aluminum alloy, designed to produce shaped castings of complex shape and having high and stable mechanical properties that do not require a hardening operation during heat treatment.

1 cl, 4 dwg, 1 tbl, 2 ex