I'm looking for a good marine shaft coating

[arcoen]

I'm trying to find a good coating system that will hold up to beaching and the sand blasting of turning shafts in shallow water. We have used fiberglass- but the smallest failure would allow water between the wrap and the shaft and hold in water- causing more corrosion. We have used the plastic coating in the past with not much better results. Any ideas or leads would be appreciated.

 

[DMcGrath]

Although I'm not sure of your application, I have seen a "paintable ceramic" called CeRam-Kote (Google it) that is used as an abrasive-resistant coating for pipes (interior and exterior), walls & floors.

 

[DMcGrath]

Here's another: General Magnaplate (sounds $$$ though)

 

[Barry1961]

Maybe a tungsten carbide/cobalt nickel electroplating?

I guess you have tried polyureathane already. It is one of the common coatings for slurry pumps.

http://www.sspc.org

is the society for protective coatings

Barry1961

 

[ornerynorsk]

There is a proprietary carbonitriding process that I read about in ASM's heat treat journal about 7 years ago. Corrosion resistance was supposed to be outstanding, as well as abrasion resistance. Sorry I can't recall the name or the company.

 

[DAVIDSTECKER]

Have you looked into "Hard Chrome" plating?

 

[BluePlanet1]

Nickel Chrome Boron shaft liners are now readily availabe for marine shafting applications where abrasives are a problem. The process known as metalizing or flamespray can be perform directly to the shaft when necessary if a liner can not be applied to the shaft itself.

check out sultzer-metco or do a google search on "metalizing or flame spray or hardened coatings"

 

[mshimko]

I haven't seen anything that holds up as well as advertised.

Assuming its a relatively small shaft (you mentioned "beaching"), I'd recommend a good marine grade stainless steel - proper material selection is much better than any feasible coating.

 

[Ussuri]

How about using glass flake reinforced polymer resin. They claim its hard as nails and good for most anti corrosion issues.

http://www.corrocoat.com/

 

[Heckler]

We have used electroless nickel on oil pump shafts and just recently on a water application. We used a coprocess of EN and Teflon called NP3. I've also used so processes by General Magnaplate with great success. Any propriatary process is going to co$t you.

 

[WKTaylor]

arcoen...

Suggest You try "floating" this question in the tribology Engineering Forum forum342... there are lots of similar problems noted there.

Regards, Wil Taylor