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Old 03-08-2008, 10:21 AM   #1
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Scratches in Anodized Aluminum, Safe to Use?

I have a Calphalon Commercial Hard-Anodized 3-quart sauté pan that I used to make Chicago style pizzas in. I then decided to cut the pizza in the pan and when I was cleaning it up I saw that the knife blade left scratches in the anodization. I looked in the instructions and saw that it said not to cut stuff in the pan when it was hot.

I did this a few years ago and the pan has just been sitting in a cupboard since then. I was wondering if the pan was still safe to cook in?

Thanks,

Chad

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Old 03-08-2008, 10:28 AM   #2
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The pan is fine - what is on the outside of the pan is also all the way through the pan. The inside of a few of my pots are now silver versus the hard anodized color because of heating salted water. It will cook the same. Just be sure to clean your pan with an abrasive to remove anything that might be in the scratched areas and basically, clean them like this after ever use. You don't want anything oxidizing on the outside or the inside.
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Old 03-08-2008, 05:36 PM   #3
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I agree with kitchenelf - it is safe to use. After aluminum is anodized it goes into a dye tank, which is where it gets its color to distinguish it from untreated aluminum. You may have only scratched through the dye. If it is coated with nonstick - you've obviously cut through that. But, it's still safe to use.

FWIW: the dye will also wear off on the bottom just from years of use, and from the inside from using metal utensils, harsh abrasives, etc.
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Old 03-08-2008, 05:42 PM   #4
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ditto what they all said.
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Old 03-08-2008, 07:21 PM   #5
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Good to hear. It wasn't non-stick so I don't have that to worry about. It only went down to the bare aluminum in a few places. This is a piece of good old Toledo made Calphalon and I'd hate to lose it.

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Old 03-10-2008, 09:13 AM   #6
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Wow.

Pretty much what others have written except anodizing is only a surface treatment thousandths of an inch/ mils / nanometers thick. Anodizing does not extend into / through the base metal/ material.

Is the pan a danger? Not really. Soon as aluminum is exposed to oxygen it forms a layer of oxide which retards further oxidation. Acidy foods may corrode the pan and undermine the anodizing but I doubt it.

If somehow more anodizing comes off I wouldn't worry about it. Anodizing is pretty inert, would probably just pass through the system.
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Old 03-10-2008, 09:28 AM   #7
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Alu is amphoteric, it will react with Acids AND Bases.

Happily, simple alu salts are Not toxic ;)
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Old 03-10-2008, 04:10 PM   #8
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Quote:
Originally Posted by YT2095 View Post
Alu is amphoteric, it will react with Acids AND Bases.
YT:
Thanks for sharing

"Saying an element amphoteric means that it is possessing both
basic and acidic properties, that it is one which is capable of yielding
both "hydrogen" and hydroxyl ions (assuming aqueous, or similar, chemistry).
This behavior is common in hydroxides of elements of intermediate
electronegativities and relatively high oxidation numbers, such as those
found near the stepped bold diagonal line of the periodic table (including
the Al and Pb you cited). Let's look at aluminum hydroxide, a hydrated
species in solution. [Al(H2O)3(OH)3] This compound will solubilize in
strong acid or base (but not much in neutral solution) by virtue of its
amphoteric nature. In strong acid, it reacts with "hydrogen" (or hydronium
ion) to become the soluble ion [Al(H2O)4(OH)2]+, and will proceed to
[Al(H2O)6]3+, also soluble. In strong base, it "accepts" hydroxyl ion (OH-)
to yield the soluble species [Al(H2O)2(OH)4]-. This is related to the
electronic configurations of the amphoteric elements, since the reaction
properties (tendency to gain, lose or share an electron) arise from electron
configuration."

Just thought the rest of the group was yurning to know this
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Old 03-10-2008, 10:41 PM   #9
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mozart - I was going to type this exact same thing earlier - I just hadn't gotten around to it yet..................................
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Old 03-11-2008, 10:08 AM   #10
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Quote:
Originally Posted by mozart View Post
YT:
Thanks for sharing
I aim to please
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