I’m having a challenge with my early efforts in electrolysis.  If you view the attached photo you will see that I’ve managed to clean the handle of my pipe wrench but I’ve had no success in cleaning the chain.  What am I doing wrong?

 You are not getting current through each individual piece of the chain.                  Dave

There is not a good connection between the rusty links of the chain so electricity doesn't pass well.  Try a gallon of vinegar and let it soak a couple of days before you rinse it off with running water and a scrub brush---and have the WD-40 handy!

Folks, thank y’all for the replies.  I can see that the current isn’t passing through the chain though it seems to have as much contact with the black lead as the handle did.  Anyway it is now soaking in vinegar as Thomas suggests.

Thanks again.

You had each individual link connected to the black lead?  That is what would be required "to have as much contact with the black lead as the handle did"  .

No, Sir, I did not.  Each group of 2 links have a connecting pin which seemed to me would provide the continuity.  I suppose there was enough rust to prevent that.

Most chains are hot dip lubed in the factory and remnants of that non-conductive coating remain virtually forever, even if they don't seem to be there.  Chain is really hard to clean via electrolysis anyway due to the many joints involved so when you add a bit of non-conductivity, it becomes a losing battle.

Even chains that we boil out in hot caustic solutions still have traces of grease in the joints after several hours of boiling (while moving--so the joints are articulating).  This is with easy to remove food grade oils too.  With some oils they also polymerize with long term oxygen contact--basically turning into what is effectively a layer of "plastic" which won't conduct and is virtually impossible to remove with any chemical.  It's similar to the coating one puts on cast iron cook-wear but to a much greater extent and toughness.

5 hours ago, ThomasPowers said:

You had each individual link connected to the black lead

You could always thread a wire through the links but it sounds like it's somewhat futile anyway. Have you tried a good old fashioned soak in acid and a wire brush? 

Pnut

He's trying a vinegar soak.   It's what I would use for chains that don't get the 'drug behind the pickup down the sandy dirt road' technique.

I don't know how I missed him saying that. I somehow skipped over that posted altogether. 

Pnut

Two days into the vinegar bath this is what the chain looks like.  All links still don’t swivel freely so it’s going back into the bath for another two days.

As I'm still working M-F; I generally leave stuff in from Saturday to Saturday and use a potato scrubbing brush under the hose bib to clean off the black crud.  It's looking better though!  (Note your hands will stink a bit...)

I have a chain wrench for pipe; but I need a longer chain as I would like to use it removing valves from welding tanks.