Current increases rate of corrosion?

In summary, the conversation discusses the potential for corrosion of a metallic wire in a salt solution, and the question of whether running a current through the wire would affect the rate of corrosion. There are various factors that could contribute to corrosion, such as the type of salt solution and the presence of air. The individual asking the question is unsure of the potential effect of current on the corrosion rate.
  • #1
Engineer_Phil
27
0
Hi,

This is my first post here, but I have searched this forum many times for insight.

See the attached image. https://www.physicsforums.com/attachment.php?attachmentid=52558&stc=1&d=1351879807 The red loop is a metalic wire. The wire is expected to corrode when it is submersed into the solution.

If I run a current through the wire will that increase, degrease or have no effect on the rate of corrosion? And to what degree?

Thank you in advance.

Phil
 

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  • #2
There are too many imponderbles here.

What sort of salt solution?
Why would you expect the wire to corrode?
What does this (corrosion) mean?

Corrosion will occur if (one of ) the metals in the wire will reat chemically with the salt solution, displacing cations and perhaps precipitating an insoluble metal compound.

It may also occur if the soltion contains entrained or dissolved air so corrosion cless can form along the wire.

Both of these processes are electrochemical so what do you think the effect of current (electrons) will be?
 
  • #3
Steel wire, saline solution.

I would expect the wire to rust. I just don't know if running current through the wre would increase or decrease the rate of corrosion.
 

1. How does an increase in current affect the rate of corrosion?

An increase in current can accelerate the rate of corrosion, especially in metals that are more reactive. This is because the current can provide additional energy for the electrochemical reactions that cause corrosion to occur.

2. What is the relationship between current and corrosion?

The relationship between current and corrosion is complex and depends on various factors such as the type of metal, the composition of the surrounding environment, and the intensity and duration of the current. In general, a higher current can lead to a higher rate of corrosion.

3. Can a decrease in current slow down corrosion?

Yes, a decrease in current can slow down the rate of corrosion. This is because a lower current means there is less energy available for the electrochemical reactions that cause corrosion. However, other factors such as the type of metal and the surrounding environment can also play a role.

4. How can current be controlled to prevent corrosion?

Current can be controlled through various methods such as using protective coatings, cathodic protection, or controlling the composition of the surrounding environment. These methods can help to reduce the current and slow down the rate of corrosion.

5. Is a higher current always bad for metal corrosion?

No, a higher current is not always bad for metal corrosion. In some cases, a controlled and monitored current can be used for processes such as electroplating. However, in most cases, a higher current can accelerate the rate of corrosion and lead to damage and deterioration of the metal.

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