Corrosion Prevention Methods

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What is the term for the important over-voltage related to activation polarization?

Concentration polarization

Reduction reaction

Cathodic protection

Activation polarization (correct)

Which process involves atoms combining to form molecules?

Atoms to molecule 2H → H2 (correct)

Adsorption of H+ solution to zinc

Coalescence of molecules into bubbles

Reduction of H ions at the surface

What type of corrosion involves oxidation and reduction reactions occurring uniformly over surfaces?

Erosion-corrosion

Stress corrosion

Uniform attack (correct)

Passivity

Which phenomenon limits the reaction rate due to diffusion?

Concentration polarization Signup and view all the answers

Under what conditions do normally active metals become extremely inert?

Passivity Signup and view all the answers

What is a method used to prevent corrosion by making a metal surface the cathode of an electrochemical cell?

Cathodic protection Signup and view all the answers

How do inhibitors contribute to corrosion prevention?

Slow oxidation/reduction reactions by removing reactants Signup and view all the answers

In the context of corrosion prevention, what is the purpose of cathodic (or sacrificial) protection?

To attach a more anodic material to the one to be protected Signup and view all the answers

How does material selection play a role in corrosion prevention?

By choosing materials that are less susceptible to corrosion Signup and view all the answers

Why are coatings applied in the context of corrosion prevention?

To act as physical barriers that reduce rates of oxidation and reduction Signup and view all the answers

How does environmental alteration contribute to corrosion prevention?

By altering environmental conditions to reduce corrosiveness Signup and view all the answers

What is the primary purpose of adding inhibitors in corrosion prevention?

To decrease reactivity in the solution by slowing down oxidation/reduction reactions Signup and view all the answers

What is the main factor that influences the rate of corrosion?

Temperature Signup and view all the answers

What type of protection involves using an external DC power source and an inert anode?

Impressed current protection Signup and view all the answers

In cathodic protection, which method involves using zinc coatings to protect the base metal?

Galvanizing protection Signup and view all the answers

What environmental effect makes ductile metals more susceptible to corrosion after cold working?

Increase in strength Signup and view all the answers

Which method of cathodic protection involves creating a galvanic couple by using a sacrificial anode?

Sacrificial anode protection Signup and view all the answers

In oxidation reactions, what is the product when a metal reacts with oxygen to form a divalent metal oxide?

$MO$ Signup and view all the answers