ACA 2022 AGM Quiz

In what year was the first P F Thompson lecture delivered at an ACA conference?

• 1968

• 1975

• 1971

• 1970

If aluminium and magnesium are coupled in seawater, which will preferentially corrode?

• Aluminium

• Magnesium

Which of the following oxidative states does Fe (iron) NOT have?

• +2

• +3

• +5

• +6

What metal alloys are most commonly used as water anodes for sacrificial cathodic protection systems?

• Zinc

• Aluminium

• Magnesium

• Lithium

Magnesium forms a surface film that provides some protection. Which of the following does NOT form?

• MgO

• MgO₂

• Mg(OH)₂

• CMgO₃

What does EMF stand for?

What type of corrosion will the condition in this image promote?

• Intergranular corrosion

• Selective leaching

• Pitting

• Crevice corrosion

What type of corrosion has caused the failure of this pipe elbow (full perforation)?

• Intergranular corrosion

• Crevice corrosion

• Erosion corrosion

• Pitting

The Pilling Bedworth (or P-B) ratio indicates the type of oxide layer that forms on a metal.

When <1 an oxide is porous and unprotective.

When >1 compressive stresses result in the film that forms.

The ratio measures the relative volume of what two things?

If the potential of a metal is in the region indicated on this diagram, what is happening to it?