QUESTION 1 Iron oxide is impermeable to oxygen? True False QUESTION 2 Approximat

Question

QUESTION 1 Iron oxide is impermeable to oxygen? True False QUESTION 2 Approximately how many lowest level classifications of ferrous alloys are there? 12 40 QUESTION 3 Bacteria metabolic products create an alkaline environment which promotes corrosion True False QUESTION 4 When two dissimilar metals are in contact, there is the possibility for what type of corrosion? galvanic crevice fatigue erosion QUESTION 5 In the solution heat treatment stage of precipitation hardening, solute atoms are dissolved to form a two phase solid solution True False QUESTION 6 Refractory metals have the highest melting temperatures of all metals True False QUESTION 7 Corrosion is the result of a chemical reaction. True False QUESTION 8 All steels are amenable to processing by mechanical deformation. True False

Explanation / Answer

1. False. Iron reacts with oxygen present in air and moisture to form iron oxide layer which is permeable in nature and allows water and oxygen to attack the underlying iron.

2. 6. There are various ferrous alloys available on the Earth crust but the major categories of ferrous alloy are Steel and cast iron. Steel is further divided into low and high alloy whereas cast iron is divided into grey and white iron

3. True. Some bacteria have the ability to produce an enzyme as part of its metabolism which ultimately leads to formation of alkali environment sometimes due to breakdown of molecules. This alkali environment produces corrosion.

4. Galvanic. When two dissimilar metals are in contact then there is a possibility of galvanic corrosion. It occurs when two different metals are located together in a corrosive electrolyte.

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