TECHNET Archives

November 2001

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Mike Fenner <[log in to unmask]>
Reply To:
Date:
Fri, 30 Nov 2001 13:52:11 -0000
Content-Type:
text/plain
Parts/Attachments:
text/plain (110 lines)
The term rust may be used slightly differently UK/US, so I dredge up from
memory what I was taught sometime ago in last century England:

Strictly only iron can rust, but it is more than just iron oxide. It is a
dynamic mixture of iron oxides and water which perpetuates itself as long as
there is a supply of oxygen in damp conditions.

Non ferrous metals don't rust therefore but they may tarnish. Phosphorus is
not a metal, so it can neither rust nor tarnish to oxide, it actually burns
quite vigorously.

As mentioned below generally oxides do not conduct, the only one I can think
of off hand that does is silver. Some oxides in conjunction with the base
metal can make rectifiers so conduct in one direction only. In iron oxide
terms old fashioned cast iron drainpipes used to accidentally act as simple
radio receivers and re-transmitters due to this rectification phenomenon.


Confession time: when I get asked this sort of "I ought to/used to know this
basic sort of stuff" question, or need to know enough to ask a harder one
myself, I quite often visit www.howstuffworks.com

You can ask almost anything you like and it usually comes back quickly with
the answer you were thinking of. More importantly it assumes almost no prior
knowledge so you can understand it.


Best regards

Mike Fenner
Applications Engineer, European Operations
Indium Corporation
 T: + 44 1908 580 400
M: + 44 7810 526 317
 F: + 44 1908 580 411
 E: [log in to unmask]
W: www.indium.com
Leadfree: http://Pb-Free.com



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of <Peter George Duncan>
Sent: Friday, November 30, 2001 12:19 AM
To: [log in to unmask]
Subject: Re: [TN] Rusty


Hi, Kathy,

Rust is a very poor conductor, as anyone with a rusty car and wiring
trouble can testify. Corrosion on battery terminals can ruin a connection,
and where oxidisation is deliberate, such as in anodising of aluminium,
electrical conductivity is poor to non-existant, depending on the thickness
of the oxide layer.

Peter Duncan




                    Kathy Kuhlow
                    <Kathy@BTW-IN        To:     [log in to unmask]
                    C.COM>               cc:     (bcc: DUNCAN Peter/Asst
Prin Engr/ST
                    Sent by:             Aero/ST Group)
                    TechNet              Subject:     [TN] Rusty
                    <[log in to unmask]
                    ORG>


                    11/30/01
                    01:55 AM
                    Please
                    respond to
                    "TechNet
                    E-Mail
                    Forum."






I was asked a question today and I can't seem to find the answer.  I think
I know but I need more then a gut feel.

Is rust conductive, just a by product, or both?  The materials we were
discussing are phosphorus, bronze, iron.  Thanks in advance.

Kat
(See attached file: TEXT.htm)



[This e-mail is confidential and may also be privileged. If you are not the
intended recipient, please delete it and notify us immediately; you should
not copy or use it for any purpose, nor disclose its contents to any other
person. Thank you.]

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------

ATOM RSS1 RSS2