Atomizer death - a new theory

[kinabaloo]

Atomizer death - a new theory

We all know that atomizers eventually die and it was long believed, reasonably enough, to be that the fine nichrome wire broke after the repeated stresses of expension and contraction, plus getting thinner as it slowly gets thinner with age.

Sun created a new theory about the final death - through examining many deceased atomizers he noticed that the nichrome wire had been disconnected at the the solder joint; his theory being that as the deposit on the coil grew bigger, it eventually pulled out the wire from the joint.

I think this may play a small part sometimes, but is not the main reason.

A well-soldered joint could not be pulled apart. Unless ... the joint had become weakened.

I believe the solder joint is weakened chemically (perhaps aided by heat) by the juice/vapor. In particular, tin is leached from the solder joint making it much softer and the join looser. Eventually, the electrical connection is lost (and the nichrome wire might even remove its leg from the joint to take up a more comfortable position (i.e. not necessarily with any great force exerted by the deposit growing in size).

The evidence for this - and also the inspiration, though it took a day for the implications to become apparent to me - was discovered by Exogenesis in his analysis of atomizer coil deposits (Analysis of the Black Gunk on Atomizer Coils). The results showed an unusual amount of the element tin within the deposit.

A possible solution is for pure silver solder to be used for connecting the nichrome wire heater coil or the use of a 'wire-wrap' technique for the join.

It remains uncertain what part of the juice causes the leaching of tin and by what reaction or other effect.

[Sun Vaporer]

kinabaloo--I do not know about this at all as the ones that were still heating somewhat the I experimented with with the Ice Cleaner where loaded with residue that was on there for months and when cleaned, the coil was tight as a drum at those contact points--So based on what I have scene--this theory would need much more investigation.

I might add that that would not explain that all of the cold ones I have examined and cleaned, the coil was in fact lifted an the contact was snapped--not disolved way. INHO--these atomizers failed due to the mechanical action of the expantion and contration that occurs with the heat and when there is residue build up on the coil, the coll can not expand and contract properly and hence forces a break in the contact. That is what it looks like upon examination and also watching the coil heat and contract with heavy residue build up.

Also note that buld up happens in a day or two--not weeks ---Sun

[kinabaloo]

Sun - but the death typically occurs after weeks not days.

I didn't say the solder was all disolved away, just weakened a bit at the join - enough for the wire to get loose. Previously you reported that the wire was pulled out of the join, not snapped. Indeed, I don't believe the wire would snap because it is on legs of some milimeters in length so it has quite a lot of room to move. Only in the very worst cases would deposit form all the way to the solder joint.

It might look like it has snapped at the joint but i think it simply lifted out of the joint.

This new theory is not completely an alternative to yours but refines it. And it is just a theory; I don't say it is fact

[taz3cat]

Sun if your theory is right we need to clean our atts everyday. May try that.

[exogenesis]

Were the 'snap points' of the dead coils at the solder joint?

The wire is looped deeply within the solder blob,
and is unlikely to pull out I think.

If the snap point is at the solder blob then the wire could have been just weakened there,
rather than dissolved completely away ?

[kinabaloo]

Many people say that one cannot solder to nichrome wire in the usual sense of a strong bond - the solder simply holds the wire in place. So it is quite possible that it can come out after spending time in fluid containing acids and solvents such as e-juice. This a very unusual environment for a soldered joint.

This can be tested of course But would involve leaving such a joint in juice for a month or two.

[Sun Vaporer]

Sun if your theory is right we need to clean our atts everyday. May try that.

Taz--you are right--just like cooking one time in a pan--it needs to be cleaned otherwise the residue hardens and builds up---the more I look at and watch these coils in action--and how the residue can build up in just one day, the more I come to the conclution that they are in fact made quite well, but the use without cleaning is their demise----Sun

[kinabaloo]

Either way, it is good news as it seems that the heater coils are not simply burning out as once believed and so there is the possibility of extending their life considerably by getting on top of the deposit issue (cleaning), lowering dry deposit content of juices and (perhaps) asking the manufactures to make a tighter joint, perhaps with a technique like wire wrap where one wire is tightlt wrapped around the other (not unlike twisting wires together).

[kinabaloo]

Sun - in that we agree: i think one can see a deposit after just a few hours of use. But there might be a joint issue as well as a deposit issue.

Regular cleaning is still as important as ever.

[kinabaloo]

The electrochemistry inside the atomizer (various metals in electrolytic juice) has been a hitherto overlooked subject. There is some discussion of this from post #30 onwards on this thread: Analysis of the Black Gunk on Atomizer Coils