Corrosion resistant aluminum alloys having high amounts of magnesium and methods of making the same
View Patent ↗Systems and methods for continuously casting Al—Mg alloy sheet or plate product having a high amount of magnesium are disclosed. The Al—Mg products have 4 or 6 to 8 or 10 wt. % Mg and are resistant to both stress corrosion cracking and intergranular corrosion.
1. A continuously cast Al—Mg alloy sheet product comprising 6.1-10 wt. % Mg,
wherein the continuously cast Al—Mg alloy sheet product has a mass loss less than 25 mg/cm 2 , as tested per ASTM G67-86;
wherein the Al—Mg alloy sheet product comprises a plurality of grains,
wherein the grains have grain boundaries, and
wherein the Al—Mg alloy sheet product is substantially free of a continuous film of β-phase at the grain boundaries;
wherein the grains of the Al—Mg alloy sheet product comprise Mg 2 Si precipitates;
wherein the Al—Mg alloy sheet product comprises at least 0.5 volume percent of Mg 2 Si precipitates based on a volume of the Al—Mg alloy sheet product; and
wherein a thickness of the Al—Mg alloy sheet product is 0.25 inches or less.
2. An automobile part comprising the Al—Mg alloy sheet product of claim 1 .
3. A marine vehicle comprising the Al—Mg alloy sheet product of claim 1 .
4. The Al—Mg alloy sheet product of claim 1 , wherein the Al—Mg alloy sheet product has a mass loss less than 15 mg/cm 2 , as tested per ASTM G67-86.
5. The Al—Mg alloy sheet product of claim 1 , wherein the Al—Mg alloy sheet product before and after age sensitization passes ASTM G44-88.