Corrosion of Ceramic Materials

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What design consideration helps to avoid galvanic corrosion?

Adding more corners and edges to the design

Insulating different metals from each other (correct)

Using different metals for all parts of the structure

Creating complex structures in the design

Which type of design is recommended to reduce corrosion?

Designs with intricate structures

Complex designs with many inner surfaces

Simple designs with few corners and edges (correct)

Designs with sharp edges and angles

What should be considered for the discharge opening of a tank during its design?

It should be placed in the middle of the tank

It should have complex mechanisms for controlled release

It should be inclined to avoid water accumulation after flushing (correct)

It should be vertical to allow easy drainage

Why is welding preferred over bolts and rivets in metal connections?

Welding ensures a more cathodic connection (C) Signup and view all the answers

What design feature is recommended for parts of a system expected to corrode quickly?

Designing them for easy replacement (A) Signup and view all the answers

Why should gaps that occur during connections be avoided in design?

Gaps can lead to isolation and must be avoided (C) Signup and view all the answers

What can be done to control the formation of a protective precipitate layer in heating and cooling water?

Reacting oxygen with additives (C) Signup and view all the answers

How can the hardness of water be removed?

Reacting oxygen with additives (A) Signup and view all the answers

Which substances are rendered less harmful by increasing their concentration due to their high oxidizing properties?

HNO3, H2SO4, H3PO4 (D) Signup and view all the answers

What is the effect of reducing the concentration of corrosive substances on the corrosion rate?

Decreases the corrosion rate (A) Signup and view all the answers

Which type of inhibitors are effective in anodic regions for steel?

Chromates and benzoate (C) Signup and view all the answers

In what conditions are inhibitors effective on metal surfaces?

Both atmospheric and aqueous medium in wet conditions (C) Signup and view all the answers

What is the purpose of cathodic protection?

Forcing the metal to act as the cathode (A) Signup and view all the answers

What are the common metals used in sacrificial anodes for cathodic protection?

Zinc, Magnesium, and Aluminum-Zinc alloys (C) Signup and view all the answers

Why are sacrificial anodes called 'sacrificial'?

Because they corrode instead of the protected structure (D) Signup and view all the answers

In cathodic protection with sacrificial anodes, what is added to protect the structures?

Metals disposed within anode bed (B) Signup and view all the answers

Which method provides a uniform current distribution along buried pipes?

Cathodic protection with sacrificial anodes (A) Signup and view all the answers

Why is Magnesium a commonly used metal for sacrificial anodes?

It has low potential and provides high current (D) Signup and view all the answers

What type of processes are involved in the corrosion of ceramic materials?

Simple chemical dissolution (D) Signup and view all the answers

Why are ceramic materials frequently utilized?

For their resistance to corrosion (D) Signup and view all the answers

What must refractory ceramics resist in many instances?

High-temperature attack by molten metals, salts, slags, and glasses (C) Signup and view all the answers

In what way do ceramic materials outperform metals in harsh environments?

By corroding less at high temperatures and pressure (B) Signup and view all the answers

What distinguishes degradation of polymeric materials from corrosion?

Degradation and corrosion processes are dissimilar (C) Signup and view all the answers

Why are polymeric materials said to experience degradation rather than corrosion?

To emphasize the difference in underlying processes (C) Signup and view all the answers

What is the primary effect of anodic inhibitors on the surface?

They passivate the surface (C) Signup and view all the answers

What happens when there is less than enough presence of anodic inhibitors in the environment?

Corrosion is accelerated (D) Signup and view all the answers

How do cathodic inhibitors function?

They precipitate on the cathode regions (C) Signup and view all the answers