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# Measurement of Copper Surface Oxide Film

7 years 2 weeks ago #1447
Dear Moderator,

I need to convert my copper surface oxide film from amstrong to mC, is there any one can give me the formula?

Many thanks and regards,
Berman

7 years 2 weeks ago #1448
Hello Berman,

An ångström or angstrom (symbol Å) is an internationally recognized non-SI unit of length equal to 0.1 nanometer or 1×10−10 meters.

Regards
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com

7 years 2 weeks ago #1449
Hi Vettecoupe,

Thanks for the correction.

I need to know how many micro coulomb do we need to measure the each thickness of oxide?

Is there any one can help to explain the principle of the copper oxide determinator?

7 years 2 weeks ago #1450
In the Wire Association International, Inc. Nonferrous Wire Handbook Volume 3, there is a chapter (Page 564) titled "Measurement of Oxide and Sulfide Films on Copper Rod and Wire" It was written by Dr. Horace Pops and is 6 pages long. Within that chapter is a section titled "Determination of Film Thickness" and it describes how one can determine the thickness of cuprous oxide, cupric oxide, cuprous sulfide and so on.

The method starts with "Voltage versus Time" plots obtained by an electrolytic reduction procedure and this is too complex to be included in this Forum. It also includes sketches. An equation is used to calculate the thickness, again too complicated to be placed in the Forums. This equation employs Faradays but as I am sure you know; 1 coulomb = 1.03642686 × 10-5 Faradays. The thickness is in centimeters but as we already discussed an ångström or angstrom (symbol Å) is an internationally recognized non-SI unit of length equal to 0.1 nanometer or 1×10−10 meters.

I suggest you purchase The Nonferrous Wire Handbook Volume 3, www.wirenet.org/waistore/productdetail.cfm?productid=14 ($$125.00 US for non-members of WAI or$$95.00 for members) or the Nonferrous Handbook Set (Volumes 2 and 3) ($$135.00 US for non-members of WAI or$$105.00 for members) www.wirenet.org/waistore/productdetail.cfm?productid=12 and have it sent by courier to your location.

I hope this helps.

Kindest regards
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com

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