Localized Corrosion and Stress-Corrosion Cracking Quiz

Play an AI-generated podcast conversation about this lesson

What are the different forms of corrosion mentioned in the text?

1- General corrosion, 2- Localized corrosion, 3- Stress-corrosion cracking, 4- Hydrogen blistering and cracking, 5- Selective corrosion, 6- Erosion corrosion, 7- High temperature corrosion, 8- Biological corrosion

Define stress-corrosion cracking and its characteristics.

Stress-corrosion cracking is a type of corrosion that occurs under tensile stress in a corrosive environment. It leads to the cracking of the material without much visible corrosion.

Explain high temperature corrosion and its two main types.

High temperature corrosion occurs at elevated temperatures and has two main types: oxidation and sulfidation.

What is selective corrosion and how does it differ from general corrosion?

Selective corrosion targets specific areas of a material, while general corrosion causes uniform thinning and loss of metal throughout the material. Signup and view all the answers

What is erosion corrosion and what makes it different from other forms of corrosion?

Erosion corrosion is a type of corrosion caused by the combined effect of corrosion and mechanical wear. It differs from other forms as it involves both chemical and physical processes. Signup and view all the answers

What are some prevention methods for general corrosion?

<ol> <li>Selection of resistant metals, 2. Use of coatings or linings, 3. Changing environmental conditions, 4. Use of inhibitors.</li> </ol> Signup and view all the answers

How can oxidation resistance in stainless steel alloys be increased?

By adding chromium and nickel (20%) Signup and view all the answers

What causes erosion corrosion and where does it commonly occur?

Erosion corrosion is caused by the removal of protective films due to erosion. It commonly occurs in liquid systems with solids like pump impellers, agitator blades, and pipeline fittings. Signup and view all the answers

What are the common types of corrosion that occur at high temperatures?

Oxidation and Sulfidation Signup and view all the answers

How does biological corrosion occur and what microorganisms are involved?

Biological corrosion occurs indirectly due to the metabolic activity of microorganisms, such as anaerobic sulfate-reducing bacteria. Signup and view all the answers

What treatment methods are commonly used to prevent erosion corrosion?

<ol> <li>Addition of an inhibitor, 2. Use of more corrosion-resistant materials, 3. Use of harder materials</li> </ol> Signup and view all the answers

What is stress corrosion cracking?

Cracking resulting from the combined effect of stress and chemical action, serious as it occurs without noticeable metal loss. Signup and view all the answers

How can the resistance of nickel alloys to sulfur-bearing gases be increased?

By adding chromium Signup and view all the answers

Give an example of stress corrosion cracking.

Season cracking of brass in environments containing ammonia. Signup and view all the answers

How can stress corrosion cracking be prevented?

<ol> <li>Elimination of high stress. 2. Changing the environment conditions, such as temperature.</li> </ol> Signup and view all the answers

What is selective corrosion?

Removal of a constituent of an alloy by corrosion without apparent volume loss but with significant strength loss. Signup and view all the answers

Provide an example of selective corrosion.

Dezincification in brass alloys, where zinc is selectively removed leaving only sponge copper. Signup and view all the answers

What is hydrogen blistering and cracking?

Microcracking and blistering caused by the diffusion of atomic hydrogen, often seen in steel equipment handling solutions containing H2S. Signup and view all the answers