5. Understanding Galvanic Corrosion with Dissimilar Metals

What is a major consequence of using dissimilar metals in construction?

• Galvanic corrosion leading to damage

• Enhanced aesthetic appeal

• Reduced cost of materials

• Increased structural integrity

What happens in galvanic corrosion?

• Electrolytes prevent corrosion

• The more active metal corrodes preferentially

• Both metals corrode at the same rate

• All metals become less reactive

Which metal acts as an anode in a galvanic cell?

• The metal with higher melting point

• The metal with higher density

• The less active metal

• The more active metal

Why is it important to understand the chemical makeup of materials used in construction?

• To enhance appearance

• To speed up construction

• To reduce costs

• To prevent galvanic corrosion

In the presence of salt water, which metal corrodes faster when in contact with copper?

• Gold

• Steel

• Aluminum

• Brass

What accelerates the corrosion of a more active metal?

• Distance from a less active metal

• Closeness to a less active metal

• Presence of non-metallic materials

• Isolation from any other metals

What is the effect of an electrolyte in galvanic corrosion?

• It stops the corrosion process

• It acts as a barrier between metals

• It facilitates the electrical contact and corrosion

• It acts as a cooling agent for the metals

How does the distance between two dissimilar metals on the reactivity spectrum affect corrosion?

• Speeds up corrosion

• No effect

• Changes the color of corrosion

• Slows down corrosion

Which roofing material combination is prone to quick corrosion?

• Copper gutters on a steel roof

• Steel gutters on a steel roof

• Steel gutters on a copper roof

• Aluminum gutters on an aluminum roof

How can the impact of galvanic corrosion be minimized in metal roofing?

• Applying a protective paint over the metals

• Avoiding any contact with water

• Using similar metals for all components

• Using only non-metallic materials