COMMUNITY FORUM

Timbear

07:38AM | 01/11/05
Member Since: 11/07/04
83 lifetime posts
Bvplumbing
An earlier poster here was looking for an alternative to using galvanized nails on copper pipe clips to secure them. I am wondering if zinc screws do damage to copper?

Thanks,


LonnythePlumber

07:50AM | 01/11/05
Tim I don't really know whether the pot metal we refer to as zinc is even a metal, let alone whether it interacts with copper. I have read the explanation several times about the exchange between dissimiliar metals and their properties but I can't say I have grasp it.

I have put Mr. Kestenholz's name in the header thinking it will attract him because the super boiler guy most likely knows. He can let us both know if he chooses.

Timbear

06:13PM | 01/11/05
Member Since: 11/07/04
83 lifetime posts
Lonny,

Apparently the "zinc screws" we see advertised are really galvanized. As to the reactions between metals, I found a table at a corrosion web site: http://www.intercorr.com/howmetals.htm

It looks like the only choice for adhering copper hangers would be copper screws or nails. Anything else will corrode.

bravey

09:23AM | 01/12/05
Member Since: 06/23/04
164 lifetime posts
"Galvanized" and "zinc coated" are two terms for the same thing. Materials that are galvanized are, in fact, coated with molten zinc in a heated vat . The process of applying the zinc is called galvanizing and the resultant coating has picked up the same name. Whereas zinc can also be applied like paint, galvanizing only occurs in the molten vat process. Lastly, "electro-galvanizing" is also another method of appying zinc which involves electricity. Similarly, when two dissimilar metals generate a corrosive action between themselves, it is refered to as "galvanic corrosion".

If you look closely at the chart that Timbear referenced, you will see that no other metal is totally inert when placed next to copper. One solution to your problem is to use zinc (or galvanized) nails that have a neoprene or fiber washer pre-applied under the head. These are available from some hardware sources for use in nailing fiberglass roof panels and other applications requiring a watertight seal. In your case, the washer will provide an insulating barrier between the copper and the zinc. This technique is often done in construction where a copper surface is coated with asphaltic tar or mastic before when it will be touching aluminum or steel. The fiber washer will provide enough separation to prevent galvanic action.

Regards
Click_to_reply_button
Inspiration_banner

INSPIRATION GALLERY



Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.

Reply_choose_button

captcha
type the code from the image

Anonymous

Post_new_button or Login_button
Register

This garden shed has been decked out to the nines. Designer Orla Kiely created the intimate home for a flower trade show, ... Built on a rocky island in the Drina River, near the town of Bajina Basta, Serbia, this wooden house was cobbled together ... Large steel-framed windows flood the interior of this remodeled Michigan barn with daylight. The owners hired Northworks A... Edging formed with upside-down wine bottles is a refreshing change. Cleverly and artistically involving recycled materials... A Washington State couple called on BC&J Architects to transform their 400-square-foot boathouse into a hub for family bea... Similar to the elevated utensil concept, hanging your pots and pans from a ceiling-mounted rack keeps them nearby and easy... For windows, doors, and mirrors that could use a little definition, the Naples Etched Glass Border adds a decorative flora... The thyme growing between these stepping stones adds a heady fragrance to strolls along this lush, low-maintenance garden ... Decoupage is an easy way to add any paper design to your switch plate, whether it is wallpaper, scrapbook paper, book page... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Reluctant to throw away any of those unidentified keys in your junk drawer? Hang them from a few chains attached to a simp... A stripped-down model, sans screened porch, starts out at $79,000. Add the porch, a heated floor for the bath, and all the... Salvaged boards in varying widths and colors make up the dramatic accent wall in this attic space. The high-gloss white of... Need a window and a door in a tight space? A Dutch door with a window may be your answer. These useful doors are split hor...
Follow_banner_a
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon
 
webapp1