Question

. Rusting and alloying​

Answer 1

Answer:

If an alloy contains ferrous metal (iron), it will rust. All alloys can corrode. Rusting occurs when we expose the metal to air and moisture, creating a layer of iron oxide. Corrosion occurs when we expose metals to air and chemicals, which leaves a formation of oxides of metals or salts.

Answer 2

Rusting:

• Rust is an iron oxide, a usually reddish- brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture.
• Rust consists of hydrous iron (III) oxides and iron (III) oxide-hydroxide, and is typically associated with the corrosion of refined iron.
• The chemical formula of rust is Fe2O3 and is commonly known as ferric oxide or iron oxide.
• The rusting process requires both the elements of water and oxygen.
• The rusting can be prevented by using an alloy, applying oil, dry coating, paint the metal.

Alloying:

• An alloy is an admixture of metals, or a metal combined with one or more other elements.
• For example: combining the metallic elements gold and copper produces red gold, gold and silver becomes white gold, and silver combined with copper produces sterling silver.
• In general, alloys have been found to be stronger and harder , less malleable, less ductile and more corrosion-resistant than the main metal making the alloy.

Types of alloys:

• Stainless alloy,
• Aluminum alloy,
• Bronze alloy,
• Nickel alloy.

Uses of alloys:

      The most common and familiar alloys are brass and carbon steel. Brass is made up of copper and zinc of varying proportions and mechanical and electrical properties to develop different types of brass alloys.