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Mounts and mixing metals

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/10/2011 at 12:47
bluejay84 View Drop Down
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I can't remember the post where I read this, but I remember it well enough that it turned my radar up to a defcom 3 or maybe even a 2.  It had something to do with mixing steel and aluminum and corrosion and pitting.  Then I read the latest post asking about loctite with a mention about sealing and it just reassured me that I still have a lot to learn. 

I'm confident that my new found "buddy" that lives in my area is going to know all about this and enlighten me on the topic, but in the interim I thought it would be good to throw out there for all of the other guys getting started.  The last thing I want to do is ruin a gun when a couple of tricks would alleviate a whole bunch of trouble.  I've always kept my guns well maintained, but have never had a scope to have even considered how to keep things clean between the mounts and the barrel. 

So there it is.  Now I'll sit back and let the pro's do their thing!  Excellent  OooRa!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/10/2011 at 20:31
bluejay84 View Drop Down
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It seems there's been plenty of views but not one response.  Was that just a really dumb question or have I really stumped everybody with that one?  Thanks.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/10/2011 at 20:53
supertool73 View Drop Down
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Well if it were bad to put an aluminum ring on a steel base, then I suppose it would also be bad to mount an aluminum base on a steel gun receiver or vise versa.  I don't think it is an issue.

I have heard things like they may react slightly different with temp changes, but I have never heard anything about mixing causing the metal to pit. 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/10/2011 at 20:55
Jon A View Drop Down
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Don't worry about it.  With good coatings any dissimilar material-induced corrosion is a non-issue in this application.  Your biggest worry is steel parts with cheap and/or scratched up coatings that can rust.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/10/2011 at 21:02
bluejay84 View Drop Down
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Thanks.  I didn't have time to bury myself in this research like I do a lot of other things.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/10/2011 at 22:02
stickbow46 View Drop Down
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+1,I've never had a problem mixing those two metals,but I do use good steel like Badger,Leuppy & GG&G to mention a few.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/10/2011 at 22:17
Roy Finn View Drop Down
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If you're concerned, prior to mounting the bases, coat the mating surfaces with a rust preventative such as Corrosion-X or EEZOX. Frankly, I wouldn't be concerned about it. Also, when using Locktite, only use a tiny amount on the first couple of threads of the base screws. I have seen Locktite stain some metal finishes so remember, it's not bedding compound.

Edited by Roy Finn - January/10/2011 at 22:22
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/11/2011 at 05:27
tahqua View Drop Down
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Most aluminum bases and rings are anodized or have other coatings. Galvanic corrosion is greatly reduced from this. I have used Weaver aluminum bases with many styles of steel rings through the years. Never a problem.

Edited by tahqua - January/11/2011 at 05:28
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/11/2011 at 15:30
bberg7794 View Drop Down
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Galvanic corrosion is reduced by anodizing and blueing, but not eliminated. This is a serious issue in aviation, where I was a structural repair tech for many years-we were also dealing with steel vs aluminum vs titanium. Because with firearms the surface area in question is quite small, it isn't as much of a problem. Occasionally you will see scopes with ring marks that have corroded (Mostly where steel tubes were fitted to aluminum rings). It also depends on your environment of course. Loctite should keep moisture out of your threads and this will only help. Coating with any oil will also help.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/11/2011 at 17:29
Dale Clifford View Drop Down
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The question is not clear from your orginal post. In the beginning there was Weaver (pre-loctite era). Weaver tip-offs, steel top, aluminum bases, steel screws. Then came steel bases with Weaver cuts. Inbetween the weaver combination was a steel weaver scope. Rust, frozen screws then came Redfield all steel. Still rust, broken windage screws, drill out old ring screws. Now that the post-loctite era is here mounting problems are pretty straight forward.
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