Preventing green corrosion on textured thin sheet brass

linnea56January 24, 2009

I bought a gorgeous new-but-antique looking wall mirror a few years ago. Planning to redecorate, it waited in the basement in its shipping carton. I was finally ready for it today and brought it upstairs ready to hang it only to find that it had corroded in the interim.

It had splotches of crusty green blue in numerous places. This mirror (which is quite large at 22" x 26") is made of thin brass with an elaborate texture stamped into it, which is then formed around an openwork wooden framework and nailed in place with tiny nails. I decided to clean it up with Penny Brite, which is what I normally use for tarnished brass or copper. This turned into a 6 hour marathon. Because of the underlying wooden framework I had to make sure it did not get too wet. The corrosion was very resistant: I had to use alternately cleaner and scotchbrite. Some parts stayed a dark spotty brown or red even after intense scrubbing, but at last all the green was gone. It originally had a nice patina in the low parts: not anymore. I finally got it 90% clear and dried it off. I reapplied the patina (another hourÂs work) and repolished those parts.

But as soon as it was dry I saw the green corrosion blooming up again! The worst areas are where the brass meets the mirror surface at a right angle, and on the sides. This surface is not textured but smooth. I canÂt possibly scrub this more than I already did. This area also I made dark brown with the new patina; corrosion coming right through it (from what I can tell).

I want to seal it to eliminate the corrosion spreading, and maybe paint over these sides with dark brown paint. At least the most important part, the textured surface seems to be OK. I donÂt want to lacquer it, it would be too difficult to remove if the corrosion canÂt be stopped and I have to clean it periodically. If I paint over the corrosion with acrylic or oil paint will that stop it from spreading? I was planning on using paste wax to seal the brass instead of lacquer. Will using paint and the paste wax work? I remember reading somewhere about using brown colored shoe polish on brass. What would work best?

Thanks!

Thank you for reporting this comment. Undo
brickeyee

Sounds like either paint on the wood or some glue was used to attach the brass tightly.

You could try cleaning a small area and then using a heat gun (or even a blow dryer) to remove the moisture before the corrosion can start again.

After that a coat of oil based polyurethane might provide enough barrier to stop the process.

    Bookmark   January 28, 2009 at 5:23PM
Sign Up to comment
More Discussions
Metal/Iron Stair rail
I moved into a house last year. It is a tri-level home....
harmony5002
Horseshoes
I have an abundance of used steel Montana horseshoes...
lilbritches1
metal compatibility
I have a built in gutter on my gable roof. The gutter...
dustynight
Painting Galvanized Metal
What's the best way to paint galvanized metal(exterior)?...
vic99
Building a snow plow pusher.
I have a large driveway to clear of snow in the winter,...
The_Ingenious_One
Sponsored Products
Side By Side Giclee CFL Swing Arm Desk Lamp
Lamps Plus
Luli Sanchez LST39 Deep Charcoal Rectangular: 2 Ft. x 3 Ft. Rug
$107.64 | Bellacor
Contemporary Indoor/Outdoor Area Rug: Garland Rugs Southpointe Shag Chocolate
$69.97 | Home Depot
Artcraft Lighting Morocco 12" Wide Chrome Wall Sconce
Lamps Plus
Vacuum Breaker
Signature Hardware
Good Ideas Garden Wizard Elevated Garden - GW-EG-GRN
$202.76 | Hayneedle
Green Leather Fold-Up Cuff Garden Gloves
$8.99 | zulily
Cordelia Lighting Outdoor Lanterns. Mesa Collection 3 Light Wall Mounted Outdoor
Home Depot
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™