Cathodic Protection and Transducers Flashcards
Cathodic protection is the process of reducing or eliminating electrochemical corrosion by?
Forcing or impressing current onto the hull
When a current is impressed on the hull it creates?
Hydrogen bubbles
What prevents anode current from shorting to the hull?
Dielectric shield
Cathodic protection operates at all times except?
Diving operations
When its being repaired
During dry dock
During planned maintenance
What are some other factors affecting the rate of corrosion?
Temperature of the water
The most common anode is made of?
Zinc
CAPAC should be logged?
Daily
How often should anodes(zinc) be replaced?
50% or every 3 years
If you impress current onto a vessels hull it will
Become Cathodic and will not corrode
Newly installed anodes should be displayed a resistance to ground of greater then ____ megohm(s)?
1
An important concept in cathodic protection is that the metal from which the current leaves the hull is called the _________ and will corrode.
Anode
In terms of cathodic protection, a less corrosion-prone metal, such as steel, is used on ships and a more corrosion-prone metal, such as _________, is used as the anode.
Zinc
In a sacrificial anode system replacement of the anode is required when the anodes have corroded to _____ %?
50
When replacing a transducer with a new transducer it must be?
The same type and range or higher range
In a CAPAC system, how long do the anodes typically last and what are their sizes?
10+ years
2’, 4’, and 8’
