Preventing Galvanic Corrosion Quiz

What is galvanic action?

• A chemical reaction between two similar metals.

• An electrochemical process that occurs when two dissimilar metals are in contact in the presence of an electrolyte.

• A physical process of metal expansion due to heat.

• A process of metal contraction due to cold.

Which of the following pairs of materials are considered dissimilar?

• Copper and copper alloy

• Aluminium and steel

• Brass and bronze

• Stainless steel and nickel

What is the primary cause of galvanic corrosion?

• Temperature fluctuations

• Humidity levels

• Electrical potential difference between dissimilar metals

• Mechanical stress

Which of the following is an effective method to prevent galvanic corrosion?

• Painting the metals

• Using a plastic insulator between the metals

• Increasing the temperature

• Applying mechanical force

Which material would you use as an adaptor to join copper and aluminium to prevent galvanic action?

• Steel

• Zinc

• Plastic

• Brass

What is the role of a dielectric union in preventing galvanic corrosion?

• It increases the electrical conductivity between metals.

• It acts as a physical barrier to prevent metal contact.

• It enhances the chemical reaction between metals.

• It reduces the mechanical strength of the joint.

Which of the following diagrams best illustrates galvanic corrosion?

• A diagram showing two similar metals in contact.

• A diagram showing two dissimilar metals in contact with an electrolyte.

• A diagram showing a single metal in a dry environment.

• A diagram showing two metals separated by an insulator.

What is the purpose of using a sacrificial anode in corrosion prevention?

• To increase the weight of the structure

• To act as a barrier to moisture

• To corrode in place of the protected metal

• To enhance the aesthetic appearance

Which of the following materials is least likely to cause galvanic corrosion when in contact with stainless steel?

• Aluminium

• Copper

• Zinc

• Titanium

What is the effect of increasing the surface area of the anodic metal in a galvanic couple?

• It decreases the rate of corrosion.

• It increases the rate of corrosion.

• It has no effect on corrosion.

• It changes the colour of the metal.