Hi again,
I did state "should be treated."
I did state "we are left with plated contacts to corrode."
Where I thought I saw green other than the blob of glue type stuff is on the body casting edge to the right of the provided image, I have now given it a more thorough look and see it is just as likely to be a lighting artefact as corrosion.
Personally I have never found a threaded fastner in a product that does not have some surface treatment, sometimes only light or substandard!
It would not make sense for a manufacturer to use untreated fastners and end up with rejects due to corrosion. Furthermore if we wanted untreated screws to plate in house where I worked they were special order and worked out dearer than chemically stripping and plating from stock.
I understand that automotive fastners are plated to withstand the elements. However I doubt periodical prolonged immersion in water containing many and varied contaminants was ever envisioned and I don't think they were meant to last 40 years. Anyway my main point was the time that undamaged plating can survive, and to discredit the notion of the corrosion appearing in a weekend! :
Basically I think we concur on this situation.
Cheers Graham.
I did state "should be treated."
I did state "we are left with plated contacts to corrode."
Where I thought I saw green other than the blob of glue type stuff is on the body casting edge to the right of the provided image, I have now given it a more thorough look and see it is just as likely to be a lighting artefact as corrosion.
Personally I have never found a threaded fastner in a product that does not have some surface treatment, sometimes only light or substandard!
It would not make sense for a manufacturer to use untreated fastners and end up with rejects due to corrosion. Furthermore if we wanted untreated screws to plate in house where I worked they were special order and worked out dearer than chemically stripping and plating from stock.
I understand that automotive fastners are plated to withstand the elements. However I doubt periodical prolonged immersion in water containing many and varied contaminants was ever envisioned and I don't think they were meant to last 40 years. Anyway my main point was the time that undamaged plating can survive, and to discredit the notion of the corrosion appearing in a weekend! :
Basically I think we concur on this situation.
Cheers Graham.
dgatwood said:Valvebounce said:It states that most likely it is an alloy of magnesium which would generally corrode to a gray film coating but should be protected by a surface treatment.
I'd expect it to be coated either way, which makes corrosion even less plausible.
Valvebounce said:The greenish colour would indicate to me a compound involving copper was involved and as this is on the body of magnesium that would be unlikely so I guess that just adds to the confusion, I would think it is unlikely to be contamination from copper of the pcb as that is lacquered over to prevent corrosion so we are left with plated contacts to corrode.
...which are all either gold plated or tinned with solder. Either way, there's no exposed copper. BTW, where do you see green? The only green I see is pretty clearly glue placed there to hold a ribbon cable into one of those shove-in connectors.
Valvebounce said:Also as I have said in previous posts part of my expertise is classic cars, I have bolts of approximately 40 years of age that have been left in containers that have collected water sufficient to cause a tide line. Yes some of the bolts have rusted, generally those with tool damage that has damaged the plating, but many have survived so clean they look like new. It is so unusual to find tool damage on fixings inside modern electronics that I would not be surprised to see no corrosion on the screws.
Bolts used in cars are plated specifically because the products are designed to live outdoors and are designed to be repairable. I would not expect screws in consumer electronics to be plated because neither of those is the case. My refrigerator, for example, had small screws that rusted because of condensation, to such a degree that I had to drill the heads. Hard to say for sure, though, whether these screws are plated or not.
Upvote
0