Cathodic Protection: Difference between revisions
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*Also referred to as "Galvanic Protection" although this is more of a technique OF Cathodic Protection | *Also referred to as "Galvanic Protection" although this is more of a technique OF Cathodic Protection | ||
*Allows for Oxidation to be sort of "rerouted" to a remote [[Sacrificial Anode]] and thus making the structure into a sort of [[Electrochemical Cell]] | *Allows for Oxidation to be sort of "rerouted" to a remote [[Sacrificial Anode]] and thus making the structure into a sort of [[Electrochemical Cell]] | ||
*This is often done with a [[Zinc Sacrificial Anode]], but technically [[ | *This is often done with a [[Zinc Sacrificial Anode]], but technically [[Galvanization]] also uses the same mechanism (althouh it isn't often referred as Cathodic Protection in everyday use to provide more clarity) | ||
*Most Boats use this for propellors, and other water exposed metals | *Most Boats use this for propellors, and other water exposed metals | ||
*This is also very common for [[Pipeline Transport]] due to the expense of replacement | *This is also very common for [[Pipeline Transport]] due to the expense of replacement | ||
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=Methods= | =Methods= | ||
==Galvanic== | ==Galvanic== | ||
*[[ | *[[Galvanization]] or use of a [[Sacrifical Anode]] | ||
==Impressed Current== | ==Impressed Current== | ||
Revision as of 01:04, 27 February 2020
Basics
- Also referred to as "Galvanic Protection" although this is more of a technique OF Cathodic Protection
- Allows for Oxidation to be sort of "rerouted" to a remote Sacrificial Anode and thus making the structure into a sort of Electrochemical Cell
- This is often done with a Zinc Sacrificial Anode, but technically Galvanization also uses the same mechanism (althouh it isn't often referred as Cathodic Protection in everyday use to provide more clarity)
- Most Boats use this for propellors, and other water exposed metals
- This is also very common for Pipeline Transport due to the expense of replacement
- Rebar is another use case
- The Sacrificial Anode can be directly attached (Usually via screws/bolts onto a clear surface), or remote via wires
- It is thus easily exchangable
- The Sacrificial Anode is gradually spent as it is oxidised, and thus must occasionally be replaced
- This does lead to more Lifelong Design when compared to simple galvanisation (Need to research how it compares to stainless steel etc)
Methods
Galvanic
- Galvanization or use of a Sacrifical Anode
Impressed Current
- An "Active system" uses current flow to accomplish the goal
Hybrid Systems
- Uses both galvanic and active methods