Understanding Corrosion and Its Prevention

What is corrosion?

• The process of becoming more resistant to chemicals

• The process of a material breaking down due to chemical reactions

• The process of a material becoming stronger when exposed to air

• The process of water freezing in cracks of a material

What is the most common form of corrosion?

• Pitting

• Rusting

• Galvanic corrosion

• Fretting

What causes rust?

• Exposure to sunlight and moisture

• Exposure to oxygen and moisture

• Exposure to high temperatures and mositure

• Exposure to plastics & moisture

What is galvanic corrosion?

• Corrosion that occurs in the absence of a liquid

• Corrosion that happens when two different metals are in contact in the presence of an electrolyte

• Corrosion that only affects single metals

• Corrosion that can be easily reversed

How can rust be prevented?

• By keeping the metal dry

• By painting the metal

• By applying a protective coating

• All of the above

What is pitting corrosion?

• A uniform layer of corrosion over the entire surface

• Corrosion that occurs only at high temperatures

• Localized corrosion leading to the creation of small holes or pits

• Corrosion that happens under mechanical stress

What is intergranular corrosion?

• Corrosion that occurs along the grain boundaries of a metal

• Corrosion that affects the entire grain of the metal

• Corrosion that happens only on the surface of the metal

• Corrosion that is caused by high pressure

What is crevice corrosion?

• Corrosion that occurs in large, open areas

• Corrosion that happens due to the metal being too soft

• Corrosion that occurs in confined spaces, such as under washers or gaskets

• Corrosion that is caused by extreme heat

What is fretting corrosion?

• Corrosion that occurs when there is no movement between two surfaces

• Corrosion that happens at the interface of two contacting surfaces under load and subject to minute relative motion

• Corrosion that is caused by chemical exposure only

• Corrosion that affects only non-metallic materials

Why is wet corrosion more common than dry corrosion?

• Because it requires less oxygen

• Because it happens only in water

• Because the presence of an electrolyte (often water) accelerates the corrosion process

• Because it is less dangerous