Corrosion in Carbon Steel Pipes Due to Air Pressure

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    Air Corrosion
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Discussion Overview

The discussion revolves around the corrosion of carbon steel pipes used for transporting compressed air, specifically exploring the causes of corrosion, including the role of moisture in the air and the potential effects of air pressure on the pipe material.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant suggests that corrosion is primarily due to the moisture content in compressed air, which is often not adequately managed in systems.
  • Another participant presents an unconventional idea that rust is caused by life, asserting that rust requires water and that iron in a water-free environment does not rust.
  • A further reply questions the initial claim about life causing rust, noting that bacteria can exist in dryer environments and that iron can rust even when bacteria are eliminated.
  • Another participant reiterates the idea that rust formation resembles the growth of microorganisms, but also acknowledges that rust is fundamentally a result of electrochemical corrosion.

Areas of Agreement / Disagreement

Participants express differing views on the causes of rust, with some emphasizing moisture as the primary factor while others propose biological influences. The discussion remains unresolved with multiple competing perspectives presented.

Contextual Notes

There are limitations regarding the assumptions about the role of moisture and life in corrosion processes, as well as the specific conditions under which corrosion occurs in carbon steel pipes.

Ask1122
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Hi all, just a quick question, I saw some of the carbon steel pipes which are used to tranpsort compressed air are corroded, when i ask, people told me that the corrosion was caused by the air. Is it the moisture in the air which causes the corrosion, or can the air pressure (sorry, can't remember the pressure in that pipe) within the pipe actually 'sheave' some of the pipe materials off?

Thanks!
 
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It's going to be because of the moisture content in the compressed air. In compressed air systems, water content is a huge problem that is usually overlooked and not dealt with properly because it can be expensive to handle. Pressure by itself can cause fatigue issues, but not corrosion.
 
unpopular idea
rust is caused by life
life needs water
rust needs water

iron in a water free environment [ deserts]
doesNOT rust

rust grows in shapes that look very much like
the growth of micro-organismic life in a petri dish
 
similar to the "biofilm" that degrades plastic?

I am intrigued, and must ponder...hhmmmmm

dr
 
ray b said:
unpopular idea
rust is caused by life
life needs water
rust needs water

iron in a water free environment [ deserts]
doesNOT rust

rust grows in shapes that look very much like
the growth of micro-organismic life in a petri dish

dr dodge said:
similar to the "biofilm" that degrades plastic?

I am intrigued, and must ponder...hhmmmmm

dr

Maybe, however:
a) There's still plenty of bacteria in dryer environments
b) If you heat pasteurize or gamma irradiate a sample of iron in water (thus killing all the bacteria), it'll still rust.

EDIT: Not to say that 'life' isn't going to accelerate corrosion (unless it actually does the opposite and builds up a layer that prevents moisture / oxygen from getting through), but life isn't going to supply moisture out of nowhere.
 
ray b said:
unpopular idea
rust is caused by life
life needs water
rust needs water

iron in a water free environment [ deserts]
doesNOT rust

rust grows in shapes that look very much like
the growth of micro-organismic life in a petri dish

rust is caused by electrochemical corrosion.
 
Thanks for the input guys! :)
 

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