Corrosion and Tarnish Quiz

What is tarnish primarily defined as?

• A protective coating

• A surface discoloration on a metal

• A method of polishing

• A type of corrosion

Which of the following can lead to tarnish in amalgam restorations?

• Formation of silver chloride

• Formation of copper sulphate

• Formation of silver sulphide

• Formation of gold oxide

What can sulphur contamination cause in noble metal alloy castings?

• Surface discoloration and roughness

• Enhanced mechanical properties

• Improved corrosion resistance

• Increased luster

What is the relationship between tarnish and corrosion?

• Tarnish has no relation to corrosion

• Tarnish is a precursor to corrosion

• Tarnish is a type of corrosion

• Tarnish prevents corrosion

What is the primary cause of corrosion?

• Reaction with water

• Reaction with its environment

• Reaction with heat

• Reaction with light

Which metal is unique in that it does not corrode?

• Silver

• Gold

• Copper

• Aluminum

What type of corrosion requires the presence of water?

• Chemical corrosion

• Electrochemical corrosion

• Dry corrosion

• Galvanic corrosion

What is galvanic corrosion?

• Corrosion caused by temperature changes

• Corrosion from acidic solutions

• Corrosion between dissimilar metals

• Corrosion due to moisture

What can cause crevice corrosion?

• Excessive polishing

• Low humidity

• High temperatures

• Localized electrochemical processes

What is stress corrosion primarily caused by?

• Electrical currents

• High temperatures

• Mechanical stress and a corrosive environment

• Chemical reactions