Electrically conductive and abrasion resistant spray-coating.

Hello.
I am looking for a spray or some other self-application that conducts electricity (preferably with as little resistance as possible) and is resistant to abrasion. There are many offers on the web with descriptions that indicate conductivity and abrasion resistance, but I prefer to ask if anyone has had contact with it and can recommend something. I am interested in the best conductivity and the highest possible abrasion resistance. I want to use it in a kind of switch where another metal element will slide over such a painted surface, so it would be good if it didn't rub off. It would also be appropriate for the product to be available for purchase
Best regards.

In my trials, the only thing that worked well was strips of self-adhesive copper foil (sometimes used in screens), properly cut.

walus12 wrote:

I want to use it in something like a switch, where another metal element will move over such a painted surface,

Give it up, as long as it's not supposed to be a multi-use switch.
On the other hand, the carbon potentiometers don't wear out too quickly. If you like to experiment, try an epoxy and silver conductive adhesive.
I can provide you with powdered silver for making glue yourself, you can buy a ready-made one, eg ELPOX 15
Much depends on what current will "handle" the switch, and thus the pressure of the moving and stationary part of the switch.

Maybe instead of combining with some sprays, just use a reed switch?

xury wrote:

Maybe instead of combining with some sprays, just use a reed switch?

Well, unfortunately not. Needs to apply a conductive coating. The predecessor also mentioned carbon coatings of the potentiometers - something similar to me.
I was thinking about something such a , possibly something such a . Does anyone have experience with similar preparations?
With copper tape there will be a problem that it will add a bit of thickness, and I would prefer it to be thin.

Added after 15 [hours] 34 [minutes]:

vodiczka wrote:

walus12 wrote:

I want to use it in something like a switch, where another metal element will move over such a painted surface,

Give it up, as long as it's not supposed to be a multi-use switch.
On the other hand, the carbon potentiometers don't wear out too quickly. If you like to experiment, try an epoxy and silver conductive adhesive.
I can provide you with powdered silver for making glue yourself, you can buy a ready-made one, eg ELPOX 15
Much depends on what current will "handle" the switch, and thus the pressure of the moving and stationary part of the switch.

I mean something similar to the surface on the potentiometers. The supported current will be very small, the clamping force is similar to that of ordinary rotary potentiometers.
Another issue is the resistance of such a surface. As long as it conducts electricity well over a distance equal to the thickness of the layer of this paint (i.e. from the metal that covers the top of this paint), how will it be with conductivity over longer distances (a few cm)?

walus12 wrote:

Another issue is the resistance of such a surface. As long as it conducts electricity well over a distance equal to the thickness of the layer of this paint (i.e. from the metal that covers the top of this paint), how will it be with conductivity over longer distances (a few cm)?

It will be similar to the copper conductor. The resistance measured along the length will be many times greater than the transverse but still low, of the order of 1 ohm or a fraction of it.

walus12 wrote:

The operated current will be very small,

. Up to how many milliamps?

Graphit available at https://www.conrad.pl/p/lakier-cramolin-graphit-1281411-200-ml-820571? and many electronics stores - it is slightly abrasive, as with all potentiometers, - as with all graphite

Graphiit 33 CONTACT 218 https://www.reichelt.com/pl/pl/Spreje-do-pow-...tml?ACTION=3&LA=446&ARTICLE=9480&GROUPID=4074 also graphite and slightly more abrasion resistant than above

EMV 35 CONTACT 260 https://www.reichelt.com/pl/pl/?ARTICLE=9517&PROVID=2788 available as above, very resistant copper varnish with good conductive properties

There are also EMI 35 https://www.sklep.cyfronika.com.pl/pl/p/KC-EM...-na-bazie-miedzi-EMV-35-pojemnosc-200ml/14655 less resistant to abrasion as above but probably more resistant to weather conditions

You can also get EMV 35 with molybdenum in some places - it is probably the most abrasion-resistant varnish

But there is probably no more abrasion resistant than self-adhesive copper tape. and it can be the cheapest.

wada wrote:

highly resistant copper varnish with good conductive properties

If the conductivity is to be good, then only silver-based varnish or glue.

vodiczka wrote:

wada wrote:

highly resistant copper varnish with good conductive properties

If the conductivity is to be good, then only silver-based varnish or glue.

What about spray zinc? Will do the trick? Ew. aluminum? Because such are available. I only see glues with silver.

walus12 wrote:

vodiczka wrote:

wada wrote:

highly resistant copper varnish with good conductive properties

If the conductivity is to be good, then only silver-based varnish or glue.

What about spray zinc? Will do the trick? Ew. aluminum? Because such are available. I only see glues with silver.

NO
poor conductivity and mechanical strength, these are sprays for protection against corrosion, e.g. galvanized gutters, or other elements where the original galvanized has been damaged

I have given you what is used in electronics, read about it EMV 35 KONTAKT 260 - the resistance of the 1cm strip and the length of 1m is about 1.5 ? and after slightly pressing it, it becomes even lower, silver will not be much better, silver in addition quite quickly corrodes and with this EMV35 some repair heated car windows.

You can buy EMV35 almost anywhere in 200ml spray.

wada wrote:

silver in addition corrodes quite quickly

You forget that silver oxide conducts electricity and that gives it an advantage over other metals. In addition, "brand" adhesives or varnishes are produced on the basis of the so-called flaked silver with a developed surface of silver particles.

vodiczka wrote:

wada wrote:

silver in addition corrodes quite quickly

You forget that silver oxide conducts electricity and that gives it an advantage over other metals. In addition, "brand" adhesives or varnishes are produced on the basis of the so-called flaked silver with a developed surface of silver particles.

And you can recommend some silver-based spray / varnish. I can't even find it. There are only glues.

No conductive varnish will be strong enough.

Freddy wrote:

No conductive varnish will be strong enough.

So what to apply? Glue?

Apply a thin foil.

Freddy wrote:

Apply a thin foil.

It can not be otherwise? I also thought about copper tape to remove the glue from it (quite thick, because the copper itself is very thin) and stick it on a conductive glue based on copper no. Elpox 15. Will such something work?