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Earn 100

The application of a protective zinc coating to steel or iron to prevent corrosion is known as _____.

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Important Questions on Minerals and Metals

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 State two ways to prevent the rusting of iron.
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When a copper plate is exposed to moist air for long, it acquires a dull green coating. The green material is:
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The process of coating iron and steel with zinc, which alloys with the surface of the base metal when dipping the metal in a bath of molten zinc is known as _____.
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During galvanization, which layer is deposited on the metal surface?
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_____ occurs when a substance combines to form a new substance.
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Which of the following factors result in stress corrosion cracking (SCC)?
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A process of corrosion prevention in which epoxy, nylon, and urethane powders bonded to the metal surface to form a thin coating is termed as _____.
MEDIUM

Consider the following statements:

1. Tarnishing of silver.
2. Rusting of iron.
3. Development of a green coating on copper and bronze.

Which of the statement(s) given above is/are correct with respect to corrosion?

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The addition of molybdenum is particularly made steels _____.

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Which of the following galvanization processes is hot-dip but only applies to steel sheet, strip, and wire?
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Which of the following steel galvanising techniques is used?

A. Hot-dip galvanising
B. Cold galvanising
C. Thermal mists
D. Electroplating

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Which of the following equations is linked to the rate of corrosion?
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What among the following is not a prevention step for stress corrosion cracking?
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Which of the following variables is critical to the corrosion process?
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Which one of the following elements corrodes rapidly?
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Which galvanization process uses powdered metals, ceramics, cermets, and certain polymeric materials?
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Which of the following means using a metal that does not corrode to cover a more corrosive metal?

MEDIUM

When a copper vessel is exposed to moist air for long, it acquires a dull green coating. The green coating is due to:

1. formation of CuOH2
2. formation of CuCO3
3. formation of CuHCO3
4. Both (1) and (2)

Codes:
A  B C  D

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Which of the following processes involves chemical action?
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In intergranular corrosion, which of the following is referred to as precipitation of carbides at grain boundaries in stainless steel or alloy, causing the steel or alloy to be susceptible?