TITANIUM

Titanium is similar to aluminum but much stronger and heavier. It’s a metal that resists corrosion because it reacts readily with oxygen and forms a protective layer of titanium oxide that keeps out air and water. Titanium also resists attack by strong acids and alkalis. It's relatively hard and brittle when it's cold and you have to heat it up to work it into shape or draw it into wires. Popular use is for airplane and spacecraft parts.