D) Teilycol
Which of the following metals is NOT corroded by air?
(A) Calcium
(B) Potassium
(C) Aluminium
D) iron
Answers
Answer:
aluminum cannot be corroded by air
Answer:
In its powder state, calcium reacts with water rapidly and reacts strongly in acid solutions. ... Low temperature - Metal corrosion reduces along with a reduction in temperature, and when calcium or calcium chloride temperature exceeds 20°F (-6.5°C)
Skin contact with potassium metals results in caustic potash corrosion. This is more hazardous than acid corrosion, because it continues unlimitedly. ... Because of its strongly corrosive mechanism potassium hydroxide concentrations between 10 and 12 ml in a 15% caustic may be lethal.
Aluminum corrodes but it does not rust. Rust refers only to iron and steel corrosion. Aluminum is actually very prone to corrosion. However, aluminum corrosion is aluminum oxide, a very hard material that actually protects the aluminum from further corrosion.
Rust forms when iron and oxygen react in the presence of water or moisture in the air. ... Rust occurs when iron or its alloys, such as steel, corrode. The surface of a piece of iron will corrode first in the presence of oxygen and water. Given enough time, any piece of iron will change entirely into rust and disintegrate.