unpainted
The element Zinc (Zn)
Need diameter as well.
The answer is... Yes! certain types of paint make them rustproof.
If this is for a fence slat use a # 8 galvinized, if it's for a 2x4 railing use a 16 D galvinized. If you want a better hold use a star head deck screw these are easier to screw in than a phillps head and can be removed easier too.
Galvinized piping fell out of favor because they a-didnt last as long as the new copper pipes and b-there was concern about the zinc coating contaminating water. If there in good condition for 70 years your probably fine. If your concerned have your water tested for lead and zinc.
If galvinized over anything a magnot will pick up.
Copper is used in switches, (light) recepticles, all house wiring, 90% of your plumbing, (if your house is pre 1970, then its galvinized pipe) copper is also in your appliances.
Yes and no. Pipes are pipes and many houses have both copper and galvinized. But copper and galvinized pipe must never come into direct contact with each other. You have to put what's called a dielectric fitting (available at your local hardware store) in between them. The problem is that without a dielectric fitting you'll get what's called electrolysis. Electrolysis eats holes in your pipes. Like I said, just put in a dielectric fitting. No sweat.
NO!! Black iron pipe has a special coating to resist the highly corrosive effect of natural gas. Galvenized pipe CANNOT be used for gas service.
PVC pipe is an acceptable product to use in chillers that contain glycol. You should never use galvinized pipe where glycol is used. Copper is acceptable as well.
My husband and I built a deck last year. I would recommend using pre-treated lumber. It will last longer than ordinary wood. Also choose the best galvinized nails available to avoid rust.
There is no chemical reaction that will happen if galvanized pipes are connected to copper pipes via a brass intermediary. The reason is that brass does not react to either copper or zinc, the mineral used to galvanize metal pipes.