What the heck happened to my bolt snap? [Archive] - ScubaBoard - Scuba Diving Forum - Diving Social Network

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Brandon
January 20th, 2012, 08:14 AM
I've had this (stainless) bolt snap on my primary regulator for almost two years now. I sent my reg off for service and it came back looking like this:

113558

Now it wasn't gorgeous before I sent it, it had plenty of corrosion on it (the dull gray kind) and I was just about ready to cut it off and replace it. But curious what may have caused the black oxidation...

I'm thinking it was liberally soaked in a cleaning agent of some sort, and the cheap metal on the bolt snap didn't hold up to it...

Any ideas?

ScubaSteve
January 20th, 2012, 08:36 AM
Is that one of them Home Depot models? :D And I think your guess is as likely as any.

Tortuga68
January 20th, 2012, 08:41 AM
Brass is class
for freshwater dives
but in salt water
only stainless survives

That doesn't really have anything to do with your thread, but I just thought it up and wanted to share it

My guess would be the same as yours, cleaning agent

Brandon
January 20th, 2012, 08:57 AM
Not from Home Depot, but not sure exactly where I picked up that one either. I have a lot of bolt snaps... I noticed last year that some I picked up from the dive shop have not been wearing very well at all; this could be one of them.

jar546
January 20th, 2012, 09:25 AM
Looks like the technician put your bolt snap in the ultrasonic cleaner and it also looks like it is not 100% stainless

Fishpie
January 20th, 2012, 10:07 AM
Ospho?

Mud&Rox
January 20th, 2012, 10:16 AM
Why do silver or stainless steel earrings turn black (http://wiki.answers.com/Q/Why_do_silver_or_stainless_steel_earrings_turn_bla ck)

herman
January 20th, 2012, 10:38 AM
That's an old diving wifes tale, pretty much all I use is brass. Rinse it with the rest of the gear and a little wd-40 in the springs once in a while and they work fine. I don't recall ever changing one due to corrosion.

As to the one in the photos that is some kind of reaction to a cleaning agent....my question is if it was attached to your hoses (guessing) why were the hoses in a cleaning agent in the first place.

Akimbo
January 20th, 2012, 12:52 PM
Are you sure it wasn't nickle-plated brass? It looks like they put it in an ultrasonic cleaner with a mild acid for corrosion removal.

jar546
January 20th, 2012, 03:40 PM
Are you sure it wasn't nickle-plated brass? It looks like they put it in an ultrasonic cleaner with a mild acid for corrosion removal.

That is what it looks like to me. This looks like the result of being in the ultrasonic cleaner a tad too long. Depends what was in the ultrasonic cleaner and how long it was in there, temp, etc,

Kilili
January 20th, 2012, 03:46 PM
First, sloppy work by the service dept. They should have removed first, then sent back with reg.
Second, stainless would not have corroded from your use in the manner you described.

I would agree with the assessment of nickel coated brass, with the nickel heavily corroded by some cleaning process and the brass showing from beneath.
Nickel coated brass is a poor choice for salt water. Ordinary brass holds up much better. Maintain as stated in an earlier posting. Stainless steel is even better, but a bit more expensive.

Ospho, as referenced earlier is a mixture of phosphoric acid and sodium dichromate, and used as a rust inhibitor coating. It turns iron oxide (rust) into inert iron phosphate. I know nothing about servicing regs, but cannot see how this stuff has any applicability, unless someone tried to use it to clean up the snap. Really don't know what it would do to nickel.

Mr Carcharodon
January 20th, 2012, 03:52 PM
From the color I'd say that is corrosion. What you probaby have is a plated bolt snap and not stainless steel. Nickel and cadmium are pretty common materials for plating. From the dark color I'd guess cadmium. The acids (and sometime bases) used for ultrasonic cleaning will accelerate the corriosion process.

Brandon
January 20th, 2012, 07:36 PM
Ordered another pile of bolt snaps from Reef Scuba and will be replacing any questionable ones... it's a minor annoyance, was more curious than anything.

Mitchell Teeters
January 21st, 2012, 06:30 PM
I noticed last year that some I picked up from the dive shop have not been wearing very well at all; this could be one of them.

Are you kidding? An LDS that is supposed to have your life in their hands actually sold a customer something cheap?? Goodness what is the world coming to?

Brandon
January 21st, 2012, 11:47 PM
Are you kidding? An LDS that is supposed to have your life in their hands actually sold a customer something cheap?? Goodness what is the world coming to?
Rofl, just had to go there, didn'tcha =p

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