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Corrosion of Ceramic Materials

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30 Questions

What design consideration helps to avoid galvanic corrosion?

Insulating different metals from each other

Which type of design is recommended to reduce corrosion?

Simple designs with few corners and edges

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

It should be inclined to avoid water accumulation after flushing

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

Welding ensures a more cathodic connection

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

Designing them for easy replacement

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

Gaps can lead to isolation and must be avoided

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

Reacting oxygen with additives

How can the hardness of water be removed?

Reacting oxygen with additives

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

HNO3, H2SO4, H3PO4

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

Decreases the corrosion rate

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

Chromates and benzoate

In what conditions are inhibitors effective on metal surfaces?

Both atmospheric and aqueous medium in wet conditions

What is the purpose of cathodic protection?

Forcing the metal to act as the cathode

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

Zinc, Magnesium, and Aluminum-Zinc alloys

Why are sacrificial anodes called 'sacrificial'?

Because they corrode instead of the protected structure

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

Metals disposed within anode bed

Which method provides a uniform current distribution along buried pipes?

Cathodic protection with sacrificial anodes

Why is Magnesium a commonly used metal for sacrificial anodes?

It has low potential and provides high current

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

Simple chemical dissolution

Why are ceramic materials frequently utilized?

For their resistance to corrosion

What must refractory ceramics resist in many instances?

High-temperature attack by molten metals, salts, slags, and glasses

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

By corroding less at high temperatures and pressure

What distinguishes degradation of polymeric materials from corrosion?

Degradation and corrosion processes are dissimilar

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

To emphasize the difference in underlying processes

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

They passivate the surface

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

Corrosion is accelerated

How do cathodic inhibitors function?

They precipitate on the cathode regions

What are some examples of cathodic inhibitors?

Both a and b

What are mixed inhibitors?

They are organic based

How do mixed inhibitors show their effects?

By adsorption

Learn about the resistance of ceramic materials to corrosion, which generally involves simple chemical dissolution as compared to metals. Explore the importance of ceramic materials in various applications due to their corrosion resistance.

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