Cathodic Protection Exam Set
Questions With Revised Correct
Answers
What types of metal is used in sacrificial anodes? - ANSWER
Zinc, aluminum, magnesium, iron, and steel wasters
What metal is used for anodic polarization on steel or
aluminum surfaces - ANSWER Zinc
What metal is used for marine environments? - ANSWER
Aluminum
What metal is used for fresh or brackish water? - ANSWER
Magnesium
What metal is used for increase in the presence of iron ions in
the water? - ANSWER Iron
What metal is used for nonferrous metal junctions to protect
sea valves? - ANSWER Steel waster
,What are sacrificial anodes mainly used on? - ANSWER
Small boats, mothball ships, and submarines
When are sacrificial anodes replaced? - ANSWER Every 3
years
Advantages to using sacrificial anodes - ANSWER No
external power source req, relatively foolproof with little
maintenance, easy to install, provides hull protection at all
times until anode is completely consumed
Disadvantages to sacrificial anodes - ANSWER Anode
current is uncontrollable, water turbulence around the hull
increases noise level, frequent replacement is necessary when
stray DC is present, fuel consumption is increased
What does ICCP mean? - ANSWER Impressed Current
Cathodic Protection
Main advtg to the ICCP - ANSWER Automatic control
feature
, What does the automatic control feature monitor? - ANSWER
continuously monitors and varies the current req for
corrosion protection
Components of the ICCP - ANSWER Grounding assembly,
power supply (saturable reactor), anodes, reference electrode,
controller (magnetic amplifier)
What monitors ICCP system automatically and adjusts output
levels in the anode to keep hull potential within a set range -
ANSWER Controller
What are the anode plates constructed of - ANSWER 2
platinum tantalum rods
Where are the anode plates bolted? - ANSWER Specific
locations
When should ICCP anodes be replaced? - ANSWER Every
10 years
Questions With Revised Correct
Answers
What types of metal is used in sacrificial anodes? - ANSWER
Zinc, aluminum, magnesium, iron, and steel wasters
What metal is used for anodic polarization on steel or
aluminum surfaces - ANSWER Zinc
What metal is used for marine environments? - ANSWER
Aluminum
What metal is used for fresh or brackish water? - ANSWER
Magnesium
What metal is used for increase in the presence of iron ions in
the water? - ANSWER Iron
What metal is used for nonferrous metal junctions to protect
sea valves? - ANSWER Steel waster
,What are sacrificial anodes mainly used on? - ANSWER
Small boats, mothball ships, and submarines
When are sacrificial anodes replaced? - ANSWER Every 3
years
Advantages to using sacrificial anodes - ANSWER No
external power source req, relatively foolproof with little
maintenance, easy to install, provides hull protection at all
times until anode is completely consumed
Disadvantages to sacrificial anodes - ANSWER Anode
current is uncontrollable, water turbulence around the hull
increases noise level, frequent replacement is necessary when
stray DC is present, fuel consumption is increased
What does ICCP mean? - ANSWER Impressed Current
Cathodic Protection
Main advtg to the ICCP - ANSWER Automatic control
feature
, What does the automatic control feature monitor? - ANSWER
continuously monitors and varies the current req for
corrosion protection
Components of the ICCP - ANSWER Grounding assembly,
power supply (saturable reactor), anodes, reference electrode,
controller (magnetic amplifier)
What monitors ICCP system automatically and adjusts output
levels in the anode to keep hull potential within a set range -
ANSWER Controller
What are the anode plates constructed of - ANSWER 2
platinum tantalum rods
Where are the anode plates bolted? - ANSWER Specific
locations
When should ICCP anodes be replaced? - ANSWER Every
10 years
