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topic 50986

What would make Brass magnetic?


January 19, 2009

I recently purchases a vase that is brass, at least that I was told it was brass. I happen to have a neo magnet and it became attracted to it and stuck to the vase. It wasn't a strong attraction and it came off easily but it stuck to it non the less. My questions are, " Is it possible that some other base metals were added to the making of the brass vase that would make it magnetic?" Also, "could it be brass electroplating?" One last question-"Is there a test to determine if my vase is somewhat brass all the way through?" I am upset that the company informed me that it is Brass and I suspect that they lied to me. I just want to know that if it's anyway possible that this could be brass or if it's common that some brass are attracted to magnets by the way it's made.Any help would be appreciated. Thanks to all.

LOU

Lou Abbatiello
hobbyist - Lindenhurst, New York


First of two simultaneous responses -- January 21, 2009

You cannot make brass magnetic. I suspect you have got a steel based product that has been plated with brass or even painted with a brass coloured lacquer

trevor crichton
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK


Second of two simultaneous responses -- January 21, 2009

Brass and it's alloys are non-ferrous (no iron content). If it is even slightly magnetic it is most likely brass plated. On the underside (bottom) of vase scrape with a sharp screwdriver to see if there is a different color metal that appears. You will probably see a silvery metal. Ferrous metals are not normally alloys in brass, and I've never heard of any that would make the brass magnetic.

Mark Baker
Fellow plater - Syracuse, New York


First of two simultaneous responses -- January 22, 2009

Sorry to be the one to break the news, but it sounds like you got taken. There isn't any "magnetic brass" that I know of - it's plated ware.

dave wichern
Dave Wichern
Consultant - The Bronx, New York


Second of two simultaneous responses -- January 23, 2009

It's probably got a plated nickel layer, then a brass topcoat. Electroplated nickel is attracted to a magnet, especially if it's thick....It doesn't sound like solid brass.

G. Brackett III
- Maine


January 26, 2009

This is a follow-up question to whether or not if brass is magnetic. The responses I have received were all appreciated. The follow-up question is,"Is it remotely possible when making the brass by combining copper and zinc that they also added iron to the mix?" Instead of just copper and zinc, it's copper, zinc and iron all mixed together in a pot and then poured. Thanks to all.

Lou Abbatiello
- Lindebhurst, New York


January 29, 2009

I think you are clutching at straws. Copper and zinc are the components of brass; if it contains iron of any degree that would make it magnetic, you have cheap second rate brass.

trevor crichton
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK

February 5, 2009

Stumbled on this thread and thought I'd toss my answers into the mix from a metallurgical perspective. First of all, non-ferrous doesn't mean that a material contains 0.0% iron iron, only that it is not iron based. Brass alloys are classified as non-ferrous because they are copper based. Brasses are primarily alloyed with zinc, but can also contain tin, manganese, nickel, lead, and iron. Iron and nickel are both ferromagnetic, manganese is paramagnetic.
Secondly, Neodymium magnets are very strong. If you had an iron based substrate that was brass plated, the magnet would have a strong attraction right through the plating.
Thirdly, the fact that the magnet is very strong means that it will be weakly attracted to very small amounts of magnetic material in the brass. I have a known sample of a copper base alloy, SAE 430B, sitting on my desk right now that has a neodymium magnet stuck to it. SAE 430B contains 2 to 4% iron, and the magnet has a fairly strong attraction (strong enough to hold 3 business cards in place).
Bottom line is I believe you have a vase that was made from a brass alloy that contains some small percentage of iron and/or nickel.

Jim Stubbs
- Minster, Ohio


August 17, 2009

Actually, WikiAnswers says that brass may contain 0.2 - 0.4% iron as an ordinary contaminant - and that's enough to get a noticeable attraction from o Neodymium-based 'super-magnet'. all of the 'commercial grade' brass bar that I've played with will be weakly attracted to a super-magnet.

Brian Spencer
teacher - Adelaied, South Australia, Australia


February 8, 2012

Jim S: SAE 430b is a manganese bronze; not brass.

George Hillier Sr.
construction - Highland, Indiana


February 12, 2014

You said you used a neo magnet, which is one of the stronger magnets. It did not "stick" to it in the sense of a true ferrous metal would be attracted to a magnet, But the neo magnet creates an electro field in line with the falling (gravity works) of the magnet which can if the magnet is strong enough seem to be magnetic. This is only a force of force created by the electrons in the brass only slightly trying to line up with the N and S poles of the neo magnet, thereby not "sticking" to the non ferrous metal but trying. In theory if the size of the neo magnet was so large in comparison to a relatively small piece of brass, it would stick.
Or perhaps another senerio posted by others could be correct.

Thomas Hayes
- Long Beach, Mississippi USA

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