3.4U Day 2 Homework

Question 1

The negative terminal of a DC generator used in an ICCP System must be connected to which of the following options?

Answer 1

The structure

Question 1

Which of the following organisms is classed as soft animal?

Answer 1

Sponges

Question 2

What is the power output range of an ICCP anode?

Answer 2

30 to 80 volts DC with 300 to 1000 amps

Question 3

Which of the following metals, in contact with steel in an electrolyte, could cause the steel to corrode?

Answer 3

Copper

Question 4

What type of corrosion is due to thermal energy dissimilarity?

Answer 4

Preferential corrosion (weld decay)

Question 5

List the 5 advantages and 4 disadvantages of a sacrificial anode system

Answer 5

Advantages:
No external Power Required
Active from day of immersion
No running costs
No danger of over-protection
Well proven and reliable

Disadvantages:
Current output decreases with time
Comparatively high initial cost
Adds considerable weight and drag
Comparatively difficult to increase protection by retro-fitting anodes

Question 6

List the advantages and disadvantages of an impressed current system

Answer 6

Advantages:
Fewer required
Reduced weight - loading
Output can be adjusted
Can be remotely monitored

Disadvantages:
No power - no protection
Continuous monitoring required
Danger of over protection
Cables are vulnerable
Hazardous to divers
Possibility of shadow areas
May increase marine growth

Question 7

List the factors that affect the rate of corrosion

Answer 7

Temperature
Current
pH

Question 8

Draw a diagram of a sacrificial anode system and indicate:

Anode
Cathode
Electrolyte
Electrons
Electron path
Positive ions
Negative ions