Podcast
Questions and Answers
What is the chemical process through which mercury attacks aluminium?
What is the chemical process through which mercury attacks aluminium?
- Oxidation
- Electrolysis
- Amalgamation (correct)
- Decomposition
In what way does mercury attack aluminium along grain boundaries?
In what way does mercury attack aluminium along grain boundaries?
- Periodically
- Indiscriminately
- Slowly
- Rapidly (correct)
Why does the anode give up electrons more easily when it is smaller than the cathode?
Why does the anode give up electrons more easily when it is smaller than the cathode?
- Due to decreased surface area
- Due to higher electron density
- Due to lower electron density
- Due to increased surface area (correct)
What effect does the chemical reaction of mercury on aluminium have in an aeroplane?
What effect does the chemical reaction of mercury on aluminium have in an aeroplane?
Which of the following metals is NOT commonly found in any quantity around aircraft?
Which of the following metals is NOT commonly found in any quantity around aircraft?
What is the corrosion product of aluminium?
What is the corrosion product of aluminium?
What is the protective coating applied to some aluminium parts?
What is the protective coating applied to some aluminium parts?
What is the effect of anodising on the thickness of the oxide film on aluminium?
What is the effect of anodising on the thickness of the oxide film on aluminium?
What should be avoided to prevent unnecessary destruction of an anodised surface?
What should be avoided to prevent unnecessary destruction of an anodised surface?
Which metal is noted for being highly susceptible to corrosion when exposed without a protective finish?
Which metal is noted for being highly susceptible to corrosion when exposed without a protective finish?
What happens to magnesium corrosion deposits over time?
What happens to magnesium corrosion deposits over time?
What is the main cause of fretting corrosion?
What is the main cause of fretting corrosion?
In fretting corrosion, why does debris act as an abrasive?
In fretting corrosion, why does debris act as an abrasive?
How is fretting corrosion visually signaled around rivets in a skin?
How is fretting corrosion visually signaled around rivets in a skin?
What distinguishes exfoliation corrosion from other forms of corrosion?
What distinguishes exfoliation corrosion from other forms of corrosion?
What is a characteristic feature of exfoliation corrosion?
What is a characteristic feature of exfoliation corrosion?
Why does exfoliation corrosion primarily affect extruded materials?
Why does exfoliation corrosion primarily affect extruded materials?
What is the purpose of cadmium as a coating on high-strength steel parts?
What is the purpose of cadmium as a coating on high-strength steel parts?
How can one identify corrosion on cadmium plating?
How can one identify corrosion on cadmium plating?
In what way does chromium protect underlying metal when used as a protective plating?
In what way does chromium protect underlying metal when used as a protective plating?
What is the protective function of chromium coatings with cracks?
What is the protective function of chromium coatings with cracks?
What happens when cadmium is coupled with steel in terms of galvanic action?
What happens when cadmium is coupled with steel in terms of galvanic action?
How does cadmium behave when it shows mottling and cracks in the plating?
How does cadmium behave when it shows mottling and cracks in the plating?
What causes the tarnish on silver surfaces?
What causes the tarnish on silver surfaces?
In what way does gold provide benefit when used as a coating?
In what way does gold provide benefit when used as a coating?
How does the tarnish on silver surfaces affect circuit electrical characteristics?
How does the tarnish on silver surfaces affect circuit electrical characteristics?
What material is silver usually plated over in circuits?
What material is silver usually plated over in circuits?
What accelerates the corrosion of copper when silver is plated over it?
What accelerates the corrosion of copper when silver is plated over it?
What color does tarnish on silver surfaces typically appear as?
What color does tarnish on silver surfaces typically appear as?
