Posted: 6/17/2013 9:35:28 AM EDT
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Anybody know what the corrosion/solvent/ and wear resistance of these lowers is?
It seems like a neat idea a lower that weighs 35% less than aluminum. So, thoughts input or otherwise? |
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Quoted:
It's used in structural applications, engine blocks, all kinds of wheel, et cetera. It's just basically lighter aluminum. That can catch fire. And has different metallurgical and fabrication properties. And has different surface treatments. But other than that, it's just like aluminum. But lighter. |
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Quoted:
It's used in structural applications, engine blocks, all kinds of wheel, et cetera. It's just basically lighter aluminum. 
Not even close. Magnesium consumer products are alloys of magnesium. The density is about 0.065 lbf/in^3, or 65% of aluminum alloys (~0.10 lbf / in^3). The ductility is poor, although no worse than aluminum castings. The applications are similar to those used for cast aluminum. |
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Quoted:
Quoted:
It's used in structural applications, engine blocks, all kinds of wheel, et cetera. It's just basically lighter aluminum. That can catch fire. And has different metallurgical and fabrication properties. And has different surface treatments. But other than that, it's just like aluminum. But lighter. Aluminum can burn... just not so easily or as well under normal circumstances. 
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Quoted:
Don't see the point. Aluminum lowers are already super light. I got one of the mag tac fde lowers. I'm using it for a light recce. I figure it gives a discount on the weight on the porky swfa 1-6 I'm using. Or, it makes a t1 and larue mount "free" in terms of weight. meh, I like the occasional whizbang chotchke of questionable necessity
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Magnesium corrodes like a motherfucker if you don't keep the protective coating in place.
Here's my take on it, the lower was engineered designed to be made out of aluminum. If you build the lower out of anything else and don't engineer and design it to take advantage of the specific strengths of the material you are using then you're wasting time and money. |
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Quoted:
Magnesium is much more reactive with oxygen than aluminum. While strong and light, aluminum makes better tools than does magnesium because both will get nicks, wear and abrasions in use. The aluminum will be less prone to corrosion. From what I under stand aluminum is practically impervious to corrosion due to the oxidation layer that forms. Obviously some things can attack it and corrode it like mercury or a strong base. |