Dielectric Grease vs bare Tin Plating for corrosion resistance?

[Jman]

Should I be using something like dielectric grease on my lugs, busbars, anderson contacts if they are in good new condition?
Does tin plating eventually give rise to resistance build up even when the coating is not worn much at all?

My connections are in 4wd engine bay, camper trailer & some items exposed briefly outdoors.

thanks

[Ampster]

Years ago when remodeling a house close to the ocean I noticed my electrician used noalox grease on the buss bars in the main service panel.
Later when I converted a VW to electric I began using it on all the motor and battery connections that would likely see current greater than 50 Amps. I think Anderson connectors are silver plated and I didnt use grease on those.
I did use a non metalic abrasive pad to clean off oxidation on the aluminum and copper battery and lug connectors before applying the noalox grease. That reduced resistance and the grease prevented further oxidation.
it should be noted that noalox grease is conductive vs dielectric grease that is non conductive.

[Mike90250]

There are several things in play, which one do you want ?

Dielectric Grease - generally clear, silicone based moisture repellent. Also reduces friction which wears off protective plating.
Anti-oxide Grease - corrosion /oxide inhibitor, with abrasive to cut thru aluminum oxide. sometimes with conductive particles of copper or silver
Conductive Grease - a carrier grease, heavily loaded with conductive particles, usually silver. For 100+ amp bolted connections
White automotive grease - gooped onto trailer electrical connectors.

[Jman]

There are several things in play, which one do you want ?

Dielectric Grease sounds right to me, but I wanted to know if clean new tin plated busbars & lugs require it or not? Do these platings eventually develop higher resistance even if not scuffed/damaged? I read one thing somewhere that even gold plating can corrode so that says to me yes in time I should coat all my stuff.

[Mike90250]

Tin does oxidize, but slowly. Di grease should not hurt things. Just a thin coat is all, don't glop it on.

[Jman]

Tin does oxidize, but slowly. Di grease should not hurt things. Just a thin coat is all, don't glop it on.

Glad to know. thanks