07:38AM | 01/11/05
Member Since: 11/07/04
83 lifetime posts
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?



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.


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

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:

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


09:23AM | 01/12/05
Member Since: 06/23/04
162 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.



Post a reply as Anonymous

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


type the code from the image


Post_new_button or Login_button

All bookworms need a good bookmark that inspires them to keep reading. To make this colorful bookmark, cut a rectangular p... It turns out that many bath and kitchen cleansers contain chemicals that are dangerous to the skin and eyes, and often pro... So often we paint tiny nooks white to make them appear larger, but opting for a dark, dramatic wall color like this one—Be... Chocolate-colored walls and large window frames allow the exposed wood beams to take center stage in this small screened p... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... Pursue what's known as the stack effect. To achieve it, open the windows on both the upper and lower floors, and as warm a... Like no other floor type, a checkerboard design works wonders to underscore the retro kitchen theme. Vinyl flooring, ceram... 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... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... If you put the washing machine in the mudroom, you can stop the kids from walking through the house in dirty, grass-staine...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon