Brass Cancer

[Bob Kingsbury]

What is the brown spots that develop on brass cases. It eventually rots
the brass. What causes it?

 

[John Kielly]

Zinc deficiency?

 

[LHSmith]

Zinc deficiency?

Mr. Kielly.........have you no shame?

ROFL




Seriously, I have always thought it to be acid from handling......many times you can actually see brown fingerprints.

 

[alinwa]

Yup, dezinkification..

 

[Bob Kingsbury]

Allowing that this may be dezincifacation, would soaking them in Viagra
do em any good

 

[lngrng]

I believe Viagra will work-harden your brass.

 

[Bill Wynne]

Well! Shoot 'em or loose 'em.

Concho Bill

 

[Paul Fielder]

I believe Viagra will work-harden your brass.

If the brass experiences hardness for 4+ hours, who do you call??


pf
<><

 

[Roger T]

Call?

Dr A.Neal

 

[Bob Kingsbury]

Having experienced brass hardening for 3 hours and 59 minutes, I called
my Doctor and he said , don't F--------- with it

 

[John Kielly]

Bob,

You have just taken a serious thread into the ridiculous.










Well done!

John

 

[mturner]

Not good

Allowing that this may be dezincifacation, would soaking them in Viagra
do em any good

Bob, It has already been proven that this only makes a cartridge more overbore, increases throat erosion, and decreases accuracy.

 

[Bob Kingsbury]

Seriously guys,
The brown spots on brass seem to rot the brass. If you catch it soon
enough and scrape it off with say a pocket knife it stops. If not,it
will go through, eventually. I have never seen this in Lapua, but
everything else.

 

[cwood3]

Somebody other than Lapua makes brass.....?????

 

[Donald]

Brass worms?

 

[alinwa]

Seriously guys,
The brown spots on brass seem to rot the brass. If you catch it soon
enough and scrape it off with say a pocket knife it stops. If not,it
will go through, eventually. I have never seen this in Lapua, but
everything else.

Bob,

I don't know.... I just keep my brass clean and don't see the cancer. I've seen some weird deposits on old cases and haven't ever traced down what it is. I just call it oxidation or "corrosion!"


sorry to derail your tenor

al

 

[John Kielly]

Hey al,

we wuz right - dezincification!

http://corrosion-doctors.org/MatSelect/corrbrass.htm#Stress

And from another site dealing with wind instruments:

The exterior of the horn is protected by a coating of lacquer. If this coating is worn off, the exterior surfaces can suffer from a different type of corrosion. This corrosion is the reaction of the salt and fatty acids in your fingers with the zinc in the brass; the process is called red rot or dezincification. As the components in your sweat attack the brass, the zinc is selectively extracted until only a porous layer of red colored copper is left behind. The process is slow, and depends on the amount of sweat, and the length of time the skin debris is in contact with the metal. If not further protected, the metal in that area becomes weak, and is easily perforated.

 

[Bill Wynne]

Bob,

You have just taken a serious thread into the ridiculous.




Well done!

John

John,

You have just taken a serious thread and added science. Could it be that you really know what you are talking about?

Concho Bill

 

[Paul Fielder]

Seriously guys,
The brown spots on brass seem to rot the brass. If you catch it soon
enough and scrape it off with say a pocket knife it stops. If not,it
will go through, eventually. I have never seen this in Lapua, but
everything else.

I've never gotten this on new brass but see it on cases that have been picked up from the range (exposed )


pf
<><

 

[alinwa]

And,

From the ridiculous to the sublime.......

Ohhh yeahhh...


al