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Impossible_Cookie596 OP t1_j5oo9vf wrote

Abstract: The monetary cost of corrosion is currently estimated at 3 to 4% of the global GDP considering direct costs exclusively. However, no study to date has quantified the environmental impact associated with steel corrosion. Here, we determined that the CO2 emissions associated with the steelmaking required to replace corroded steel will be 4.1–9.1% of the total by 2030 considering the European Union and recent U.S. greenhouse gas reduction targets. We suggest that implementing corrosion management best-practices could drastically reduce the greenhouse gas emissions associated with the replacement of corroded steel and emphasize the need for coordinated international efforts.

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Shotgun81 t1_j5rl05h wrote

I used to teach a corrosion course at my local college.

What best practices are they wanting to implement? Most companies take anti corrosion measures pretty seriously (at least the ones I am familiar with). Loss to corrosion costs money to replace, and failures due to corrosion cost a lot in potential damages to personnel, equipment, and fines I it causes environmental damages.

Keep in mind corrosion can't be stopped, only slowed.

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cako82 t1_j5rraih wrote

How effective is the use of phosphoric acid on the surface of steel? i have used it in the past to treat surface level corrosion, prior to apply a layer of protection. interested in your opinion.

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Shotgun81 t1_j5s1zt4 wrote

It's great for what it does and is a useful cleaning agent to prepare many types of stainless steel for a protective coating. However, you do have to be aware of the type of stainless steel you have before you use it. Off the rope of my head, I seem to recall that there are a few varieties of stainless that have additives that can react badly with the phosphorus... plus just plain impurities like chloride can potentially set up micro areas of intense corrosion.

I believe there are charts available with a Google search that can outline the compatability of different stainless steels with phosphoric acid.

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cako82 t1_j5s3b6n wrote

Never used it on stainless steel tho, for stainless I have used zinc anode on marine weathers, the phosphorus acid on carbon steel, was a tip that a chemical engineer gave while ago for treat corrosion prior to apply a protective layer. Appreciate the answer for expanding the uses of the component.

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Shotgun81 t1_j5s64o0 wrote

Hmmm... I've never used it on carbon steel. Cool, I'll have to check it out. If it does apply a protective layer, I would think it does so by pre-corroding the top layers, similar to the galvanic coating on galvanized steel pipes and fittings.

I'd have to look more into it to know how durable the coating is, once it is scratched or worn, it would of course be useless.

Edit: you also have to check the permeability of the corrosion product coating. If it's too permeable it's also significantly less useful.

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