Yes tin alloys tend to be yellow hue. However the hue you get on solders is
slight and is more easily determined by eye in side by side comparison to
another solder alloy. E.g. Lead alloys are slightly blue grey, silver
containing alloys are "warm" looking and so on, but I wouldn't use oxide
colour as a firm diagnostic. This is because
- these colour differences only seem to be visible to people who are around
metals a lot.
- you can get interference effects with thin oxide films (similar to oil on
water) so colour can vary considerably from the normal typical slightly
yellow appearance of high tin alloy.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of R Sedlak
Sent: Saturday, February 27, 2010 8:26 AM
To: [log in to unmask]
Subject: Re: [TN] Colour of Oxidized Tin
Paul: Your question is not really answerable, however you spell it! The
term "oxidized" is usually thought to mean "reacted with Oxygen", but in the
strict chemical sense, (and in the real world) it can mean reacted with
anything, where the metal no longer has the full count of electrons. And
what it has reacted with will profoundly affect the colo(u)r.
This is further complicated by the fact that Tin has two oxidation states,
+2 & +4...
You can't tell if it is Tin by the colo(u)r!
Rudy Sedlak
RD Chemical Company
--- On Fri, 2/26/10, Paul Reid <[log in to unmask]> wrote:
From: Paul Reid <[log in to unmask]>
Subject: [TN] Colour of Oxidized Tin
To: [log in to unmask]
Date: Friday, February 26, 2010, 1:28 PM
Hi Everyone,
If we have oxidized tin what colour would you expect tin oxidation to
be.
I thought silver would oxidize black while tin might be more yellow or
gold.
Notice I used the word colour because I am in Canada.
Sincerely,
Paul Reid
Program Coordinator
PWB Interconnect Solutions Inc.
235 Stafford Rd., West, Unit 103
Nepean, Ontario
Canada, K2H 9C1
613 596 4244 ext. 229
Skype paul_reid_pwb
[log in to unmask] <mailto:[log in to unmask]>
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