20% H2O2 Wash Down on 6000 Series Extrusion

[MadMango]

I have never dealt with a 20% hydrogen peroxide wash down environment before. I know hydrogen peroxide is acidic. Working with 6000 series aluminum extrusions, what would be a recommended finish for the extrusions? I need to clarify with the customer, there specs mention "occasional wash down", and I'm not sure if that is weekly, monthly, or other.

These extrusions will be attached to painted steel racks, do I need to isolate them to prevent further corrosion? The contact area will probably be very small, perhaps 8sq inches over a length of 9ft.

Thanks in advance.

"Art without engineering is dreaming; Engineering without art is calculating."

Have you read faq731-376 to make the best use of these Forums?

 

[cloa]

Wrong forum- You want corrosion engineering. BTW Hydrogen peroxide is very oxidising and depending on the metal may be catalysed to disproportionate that is form oxygen and water.

 

[MintJulep]

Also, if the washing is performed by maintenance or janitorial types they WILL mix it stronger.

"If 20% is good then 50% is better and 100% should really do the trick."

 

[DesignerGuy16]

If it's anything like chlorine based cleaners on 6000 series aluminum, the only thing we've found that really helps is a clear powdercoat over clear anodize. Problem is it's brittle, and if it cracks it will spread. Hopefully this is being used somewhere that it won't see a lot of abuse?

There are also some high end nickel/teflon infused matrix coatings out now that will actually fuse with the substrate and the teflon "self heals" the surface so any defects do not spread. The best one I know of, Rossi is using for new gearboxes. It's some proprietary coating done in Italy. That's all I really know about it.

Otherwise you could probably talk with General Magnaplate and they could also recommend something.

James Spisich
Design Engineer, CSWP

 

[MadMango]

OK, thanks for the replies. I'll take cloa's advice and repost this in forum338. So there's no need to keep this discussion going on here.

"Art without engineering is dreaming; Engineering without art is calculating."

Have you read faq731-376 to make the best use of these Forums?