12. Give reasons for the following
a. Mostiron articles are electroplated with zinc.
b. Rims of wheels of vehicles are electroplated with chromium.
Answers
Answer:
a.
8th
Physics
Chemical Effects of Electric Current
Electroplating
A coating of zinc is deposi...
PHYSICS
A coating of zinc is deposited on iron to protect it from __________.
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ANSWER
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
Galvanizing protects in two ways:
it forms a coating of corrosion-resistant zinc which prevents corrosive substances from reaching the more delicate part of the metal.
the zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc.
Hence, A coating of zinc is deposited on iron to protect it from corrosion and formation of rust.
b. Chromium avoids corrosion and increase the hardness thus increasing the life of the iron materials like rims and car parts. That's why rims of wheels of vehicles are electroplated with chromium.
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