Does anybody know a way to protect a steel component that is continually submersed in water from rusting???

Ive looked at Zinc electroplating but was told it may only last a year before the Zinc gives up to the steel.

Suggested that I might try Nickel, but before I do I thought i'd ask here since I know some people on here experience of this sort of stuff.

Any advice for what might work???

 

Make it from stainless steel.

Nickel plating will fail eventually too. !

 

What water is it, SALTWATER or just normal water ?
What is the temp of the water ?
tabetha

 

What sort of size are we talking about mate?

What sort of conditions will it be exposed to - will it be static water or moving etc.

Cheers

 

powdercoating?

or as said,,, make it from high quailty stainless

 

Thanks to ALL for the replies

I tried but its killing all my tooling

Just normal water (possibly with methanol added).


Its essentially the same as a Bulkhead adaptor for a Tank outlet.
Or put another way, its like an M16 set screw, with a 1/4 BSP hole through the middle.
Tank has a hole on the bottom, the adaptor pushes through the hole, then a dowty washer is pushed onto the external thread and a nut screwed on to hold it in place. Then a 1/4 BSP hose Elbow adaptor (a bit like the 3rd one in the pic) is screwed into the internal thread.
Mainly static only movement is due to gravity.
Its the outlet for my Water Injection tank.

The outlet I have now is Zinc coated steel, and has started rusting.

Ive tried to find one in Aluminium but unsuccessfully :-(

Would this work??? I can get it powder coated for nothing (family member).........

Just for clarification here's a quick drawing of what it is............



The bottom of the 4 shown on the left is what I have but not in SS but normal steel.
I also had the upper face machined (the top that is inside the tank) to a lower profile, with ramped edges and slots for easier water passage out.

 

worth maybe checking a local plumbing shop incase they sell something similar in plastic??

 

Thanks for that, im planning to tomorrow, as well as a Hydraulics place near to me as well..........

Ive heard they can be found in brass too..........

 

Could you get a local machining company to make you one in aluminium?

Is there an aeroquip equivalent?

 

by the sounds of it you seam to have access to machines. if you could get a lump of plastic and machine it down to 16mm and drill a hole through it, and put your shoulder on it etc you could probably source a bsp tap somewhere.

good luck with it

 

didnt think of doing it in ally

 

Stainless is hard i will say that, are you using plenty of metal cutting fluid while trying to turn it etc and correct speed settings? Or is it the tapping part thats the hard bit? If you really are struggling go to a machine shop and they will do it for you i had a couple of sump plugs made for fitting an oil temp sender purely because i didnt have the right tap. When i went to pick them up they gave them to me free of charge!

 

What tooling are you using? What DOC and feeds are you using? I've always found Stainless (depending on the grade) reasonably easy to machine, although I know some people totally hate working with it because it work hardens quite easily.

 

I can probably answer both of these in one.........

I have a very old manual lathe with limited tools, and plenty of free play in the threads
But it was free and is plenty good enough for the Aluminium parts i've turned.

Just nowhere upto the job of doing SS.





There's only one close to me, I went there with the original, that was the place that machined the slots and the radius edge. Bloke was a bit of an arsehole in the end and said when he reluctantly gave it back to me, "we dont normally do small jobs like this so dont bother coming back again"
Charming!!!

I might have to wait until I travel a bit further away and see if there are any other machine shops that might be able to help, unless I can get a waterproof coating of some kind for this one..........

 

just an aside, but would you be better having the dowty washer inside, between the fitting and the tank? There is the potential to leak past the threads inside the nut as is..

 

Very probably Rich, But i wanted to keep the profile as low as possible. The washer would just add to the height of the outlet internally and prevent more water from getting out
The tank is not that big and so I need to utilise what volume I have.

I had loads of PTFE on the threads too............

 

Well............

I think I may have found something to try
RS components 458-6823

Is SS, and has an internal 1/4 BSP and external thread of 20.5mm.

Might be ok, what would be better Brass or SS??? the SS is about twice as much.........

 

Get a threaded fitting welded onto the tank and use aeroquip?

 

Cant do that its plastic...........