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May 6th, 2020, 09:00 PM #1
Brownells says galvanic corrosion isn't a real problem
I'm not contesting what they are saying. Just sharing.
-Zach
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May 6th, 2020, 09:22 PM #2
Re: Brownells says galvanic corrosion isn't a real problem
Haha! This came up in my last build thread when I was at the point of installing my barrel.
The whole internet says that you have to use AeroShell "somenumber" grease ONLY in order to prevent this corrosion from locking your barrel to your upper.
I said "fuck it", I'm not paying $12 of a dab of this wonder grease - I used the synthetic axle grease that sits in a tub in my garage.I called to check my ZIP CODE!....DY-NO-MITE!!!
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May 6th, 2020, 10:06 PM #3
Re: Brownells says galvanic corrosion isn't a real problem
Both vids are correct; galvanic corrosion of an AR barrel, barrel nut, and upper receiver is a non-problem due in part to non-electrically-conductive anodizing on the receiver. In addition, there is usually no corrosion-promoting electrolyte present. Corrosion won't happen without an electrolyte; it doesn't have to be sea water with ~ 3.5% salt, plain tap water is impure enough to carry a charge between aluminum and steel. ARs are simply too dry to corrode, the vast majority of the time. The people who use their ARs/M4s/M16s in water generally clean them well afterward, so even those guns aren't going to see "white rust" form like it does under the silver colored powder coating on older Toyota aluminum wheels.
NoahWisdom and knowledge shall be the stability of thy times.
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May 6th, 2020, 10:11 PM #4
Re: Brownells says galvanic corrosion isn't a real problem
They are correct, even if they don't know why! If one recalls the 'galvanic series' chart from chemistry, the two metals are fairly close in potential, so the chances of galvanic corrosion are minimal.
[ATTACH=CONFIG]132200[/img]Resistance to tyrants is obedience to God.
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May 6th, 2020, 10:17 PM #5
Re: Brownells says galvanic corrosion isn't a real problem
My understanding of it isn't that the metals themselves are the issue. It is an issue when you use graphite based lubricants (which lots of lubricants are).
Again, I'm not arguing the videos. Just passing the argument along.
-Zach
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May 7th, 2020, 06:56 AM #6
Re: Brownells says galvanic corrosion isn't a real problem
The same thing happened to those "forever" doors sold by home dumpster when they first opened up.
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May 7th, 2020, 08:23 AM #7
Re: Brownells says galvanic corrosion isn't a real problem
For awhile I thought I'd be tightening the barrel nut over and over until it completely seated because of the different expansion rates of the two metals.
If you've ever wrenched on a Harley Shovelhead, or anything with aluminum heads, you know what I'm talking about.
However I don't think the temp cycle is extreme enough, no matter how hard you run it, to warrant being concerned since I've never had to retighten one.
I believe the only time you need to worry about corrosion reaction is when that unfortunate boating accident occurs.
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May 7th, 2020, 08:40 AM #8
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May 7th, 2020, 09:24 AM #9
Re: Brownells says galvanic corrosion isn't a real problem
I disagree. The gasket material can be any of several different compounds depending on usage.
Aluminum alloys have a linear thermal expansion (10-6 in/(in oF)) of anywhere between roughly 9 & 13 depending on the alloy.
Iron & steel, depending on the alloy, has an expansion rate of around 6.
It will take several heat cycles between 70 & 500 degrees to get these two to play well together.
I'm referring to extremes that an AR may not ever experience.
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May 7th, 2020, 09:25 AM #10
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