Chapter 2 - Corrosion Flashcards

0
Q

What is passivation?

A

A layer of oxides formed on the surface of a metal that provides corrosion protection. Stainless steel for example.

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1
Q

Define corrosion.

A

The deterioration of a substance, usually a metal from a reaction with its environment.

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2
Q

What are the elements of a corrosion cell?

A

Anode
Cathode
Metallic Pathway
Electrolyte

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3
Q

Describe what happens at the anode.

A

The metal dissolves into the electrolyte.

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4
Q

What is the function of the electrolyte?

A

Allows the passage of ions to connect the corrosion cell.

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5
Q

What is the function of the metallic pathway?

A

Allows the flow of electrons to connect the corrosion cell.

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6
Q

What is the galvanic series?

A

A listing of metals in order of reactivity (more or less noble) in seawater at 25*C.

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7
Q

The general rules of galvanic corrosion are:

A

The less noble (or more reactive) metal when connected to a more noble (or less reactive metal) will corrode preferentially.

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8
Q

Name the five most important factors that affect the rate of corrosion temperature.

A
Humidity
Oxygen
Chemical salts
Pollutants
Gases
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9
Q

General corrosion is:

A
  • Results in a relatively uniform loss of material over the entire surface
  • Results in a general thinning of the affected surface
  • Relatively easy to inspect
  • Does not cause catastrophic failures
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10
Q

Localized corrosion is:

A

Typically Pitting and Crevice Corrosion. It is typically of the most concern as damage is concentrated and loss of integrity or structural failure can result.

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11
Q

List some of the common tools/methods used for corrosion control.

A
  • Design
  • Inhibitors
  • Material Selection
  • Cathodic Protection
  • Protective Coatings
  • Splash Zone Systems
  • Alteration of the Environment
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