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Sony Magnesium Cases = too soft??

post #1 of 36
Thread Starter 
I have noticed several posts regarding the Magnesium cases on Sony's top PCDP's (D-EJ01 and D-EJ1000) and MD's being easily scratched and marked.

Is this true?

Could some owners please post their thoughts on this?
post #2 of 36

It is an issue. My D-EJ01 is in perfect condition and has been pampered with a headroom airbag and no "active" use, yet I can still see tiny bleamishes on it.

However, my Japanese MZ-E900 MD player is magnesium too and I don't think it could be scratched in any way... I guess it also depends on some other factors.
post #3 of 36
My japanese e900 came with a tiny blemish on it
post #4 of 36
Oh yeah, it's an issue. My CDP has this giant scratch on it. Also it likes to eat cds, it scratches the top of the cd, which is worse than scratching the bottom. Grr I need a new pcdp, my D-EJ815 has had its last day with me today.
post #5 of 36
my e900 came with a small black mark. It won't come off! Pisses me off . . .
post #6 of 36
I haven't had any problems with my MZ-R90 or MZ-R909 which I believe both have a magnesium case, but my newly arrived D-EJ1000 has small surface scratches on the top cover (since I received it). Unlike the mark on chych's player, mine aren't even noticeable unless you look at it closely and turn it the right way so the light catches it just right. If I had to do it over again, I would still buy it. One thing about it though, it doesn't seem to be as sturdy as some of my others (my 915 for example), but part of that might be just my perception from its smaller size and lighter weight. I am going to be a little more careful with the 1000, but not paranoid or anything. I'll just make sure I carry it in its supplied cloth bag.

post #7 of 36
It's one of the tradeoffs you get with Magnesium-alloy (if it were just magnesium it would burst into flames quite easily ). Magnesium-alloy is much stronger than steel or aluminum at similar thicknesses and weights, so it's a great material to use for portable electronics. Unfortunately, it also scratches easier
post #8 of 36
I wonder if a really fine grade of sandpaper or steel wool, or even one of those burnishing strips would help to buff out any little scratches? At this point I am not willing to risk further damage for the tiny marks I have now, but in the future I may if it gets a lot worse.

post #9 of 36
Magnesium alloys are probably the WORST materials that consumer products of any type and any grade can be made of.

Magnesium alloys are not all that strong, especially compared to some of the wrought aluminum alloys. Magnesium is very soft, very prone to all types of corrosion, probably the MOST corrosion prone material you can find, bends easily just before it breaks, as most have said it scratches easily. Most of the stains you're talking about are various forms of corrosion, which, fortunately, have not penetrated deeply.

With a mag alloy case, don't get within 20 miles of the coast or it will fall apart. Don't eat salty foods and then touch it. don't spill acids or bases or water on it.

If it's a Mag Alloy, run from it as fast as you can. Get Aluminum. Far stronger, more corrosion resistant, less likely to scratch, and generally, a far superior material.

They've almost completely stopped using mag alloys in aerospace. The stuff sucks.

I speak from 25 years as Metallurgical Lab Manager in Aeospace.
post #10 of 36
On Sony's web page for the D-EJ1000, they list one of the features as: "Rugged, lightweight magnesium alloy lid". That would presume that Sony used the material because if its light weight and strength. Who knows what they were thinking.

It sounds like magnesium alloys were used in the aerospace industry at one time. At the time what were the advantages considered to be? Any way to bring the finish of a mag alloy back to better condition?
post #11 of 36
yeah, the mark I have has to been turned into the light, but I'm still angry.
post #12 of 36
Dammit, why can't they just make a d-25s sound quality, d-ej1000 size, all TITANIUM lid AND bottom.... With a 10-disc cd-changer.

...and Cold fusion power batteries??
post #13 of 36
Mag alloys were widely used in aerospace at one time. However, all the disadvantages of magnesium led to development of newer and far superior replacement materials.

Composites, Titanium alloys, Aluminum-Lithium, and newer aluminum casting and wrought alloys heve almost totally replaced Magnesium.

Titanium and Aluminum-Lithium are difficult to work with, but strength/weight and corrosion resistance are very high. Plus, Titanium is one of the most corrosion resistant metals known and also has tremendous strength properties at elevated temperatures.

Magnesium was always used when there was a really critical weight problem and they didn't have a substitute. They have many now. Plus, Mag Alloys can still be ignited fairly easily and burn in air at 6K degrees F. I can't believe they'd use it for the case of a consumer product, but I guess it sounds exotic.

Jewelers rouge MAY, repeat MAY, polishe some of the marks out without leaving other marks.
post #14 of 36
gaineso, to be fair, I'm willing to bet that the mag alloys they're using now in a lot of consumer electronics (MD players, CD players, laptop frames, etc.) are made of different materials than those used in aerospace
post #15 of 36
Have you got any scratches on your e900 MacDEF? I'm really glad I got the blue model...
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