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Corrosion of Metals

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Questions and Answers

What is the primary type of corrosion that affects metals?

Galvanic corrosion

Electrochemical corrosion (correct)

Electrolytic corrosion

Chemical corrosion

What is the process facilitated by the presence of a suitable electron acceptor?

Depolarization reaction

Reduction reaction

Electrochemical corrosion (correct)

Oxidation reaction

What can corrosion be viewed as?

The spontaneous return of metals to their ores (correct)

The transformation of metals into energy

The creation of new metal compounds

The destruction of metal structures

What is the estimated annual cost of corrosion in the U.S.?

$276 billion Signup and view all the answers

Which industries suffer the largest economic impact due to corrosion?

Utilities and transportation Signup and view all the answers

What is a characteristic of most corrosion processes?

Oxidation and reduction steps occur at separate locations Signup and view all the answers

What feature of metals allows electrons to flow from the anodic to the cathodic regions, facilitating corrosion?

Their conductivity Signup and view all the answers

What is the primary purpose of water in the corrosion process?

To transport ions to and from the metal Signup and view all the answers

What is the result of the reduction of oxygen gas in the corrosion process?

The formation of hydroxide ions Signup and view all the answers

Why do atoms in regions that have undergone stress tend to become anodic?

Because they have higher free energies Signup and view all the answers

Why are hidden sites often more prone to corrosion?

Because they are more protected from the atmosphere Signup and view all the answers

What is the result of the high pH produced in cathodic regions?

The destruction of the protective oxide film Signup and view all the answers