Plating mild steel for corrosion resistance to withstand 900C 1

[asimpson]

I need to stop mild steel rusting from contact with water. Steel gets up to 900C so a plating will have to stand up to that.

Water is normal tap water and cannot be treated with rust inhibitors.


Any help?

Thanks

 

[TVP]

If the temperature rapidly fluctuates from ambient to 900 C, then it is unlikely that standard electroplated coatings will be durable. Perhaps one of the nitride-type tool coatings, e.g. TiN, TiAlN, etc. CVD deposition tends to have better adhesion than PVD, although the deposition technology is astounding, and huge gains are made on a constant basis.

 

[dvd]

How big is the piece to be plated? Do the economics work out to make the part out of a different material and forgo the plating?

 

[arunmrao]

The protection might be goodtill the plating lasts.Advice ,to select an appropriate material for the application.

_____________________________________
"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year

 

[asimpson]

Thanks for replying.

Part about 140X140X100 mm with 15mm holes.

Has to be mild steel

 

[moltenmetal]

No plating will do that. Some coatings might make the part last at least a while longer, but at 900 C with a substrate of plain carbon steel you're asking for too much.

http://endurancetechnologies.com/wp-content/uploads/et_alonizing_about_brochure.pdf

 

[MintJulep]

General Magnaplate claims that Dynaloy is capable of those temperatures.

http://www.magnaplate.com/coatings/dynaloy/

I agree with moltenmetal though, it's unlikely that it will do what you hope it will do.

 

[arunmrao]

"Has to be mild steel". Is the cost factor a constraint? Plating is not going to succeed.

_____________________________________
"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year

 

[MiketheEngineer]

At 900 C aren't you getting close to a melt down??

 

[metengr]

Carbon steel will melt well above 900 deg C but will not last under repeated or continuous exposure to 900 deg C because of severe oxidation, loss of mechanical strength, and creep deformation. I would worry more about thermal fatigue damage if temperature does indeed fluctuate between ambient and 900 deg C.

The proper approach is to select a suitable base material that will handle exposure to water and exposure to 900 deg C versus any coatings. Try one of the 321H or 347 H stainless steel alloys.

 

[MJCronin]

metengr is spot-on correct.

The selection of coatings or plating is immaterial if the plated material degrades.

Carbon steel will degrade by a process known as "graphitization" when subject to a continuous temperature of about 450C

More informations here:

http://www.eng-tips.com/viewthread.cfm?qid=120971&page=182