Question

Which of the following is used to galvanize metals, making them resistant to oxidation (rusting)?
A. Zinc
B. Iron
C. Tin
D. Aluminium
E. Hydrogen

Answer 1

The method of applying a protective zinc coating to iron or steel to avoid rusting is known as galvanising or galvanizing (or galvanising). The most popular process is hot dip galvanising, which involves immersing steel parts in molten zinc.

Complete step by step answer:
The method of applying a protective zinc coating to iron or steel to avoid rusting is known as galvanising or galvanizing (or galvanising). The most popular process is hot dip galvanising, which involves immersing steel parts in molten zinc.
The underlying iron or steel is protected in many ways by galvanising:
- When the zinc layer is intact, it prevents corrosive chemicals from touching the steel or iron underneath.
- Additional electroplating, such as a chromate conversion coating, can be added to the substrate material to provide additional surface passivation.
Protection will be maintained even though the underlying metal is exposed as long as there is zinc near enough to be electrically coupled. Localized corrosion of the base metal will occur after all of the zinc in the surrounding region has been absorbed.
Since zinc oxidises and experiences acid corrosion “sacrificially” on steel, it is used in the galvanising phase instead of other metals. When zinc comes into contact with steel, oxygen and acids strike the zinc instead of the steel under it.

Note: Since zinc oxidises and experiences acid corrosion “sacrificially” on steel, it is used in the galvanising phase instead of other metals. When zinc comes into contact with steel, oxygen and acids strike the zinc instead of the steel under it.