compatable metals

[Madchark]

Can stainless steel bolts be used to fasten bronze thru hulls and zinc plates without having a compatability problem? The connections will be all grouned to the zinc plate.

Any feedback is appreciated.

Thanks,

T.

[seapower]

I can't say it's the "best" way, but I think you'll find just by walking around most boat yard's that it's done very frequently. I know there is info out there that will give you the precise answer. I'm just telling what I see every day. Making sure that those component's are bonded will help alot. Frank

[clt_capt]

Good Bonding is key. The Bronze fittings are actually more resistant than the stainless, and copper wiring used to connect between the thru-hulls and the zinc are slightly more resistant than the bronze.

Galvanic corosion is always going to find the weak link - Make sure you have a good connection to your zincs...




Gold, solid and plated, Gold-platinum alloy 0.00Rhodium plated on silver-plated copper 0.05
Silver, solid or plated; monel metal. High nickel-copper alloys 0.15
Nickel, solid or plated, titanium an s alloys, Monel 0.30
Copper, solid or plated; low brasses or bronzes; silver solder; German silvery high copper-nickel alloys; nickel-chromium alloys 0.35
Brass and bronzes 0.40
High brasses and bronzes 0.45
18% chromium type corrosion-resistant steels 0.50
Chromium plated; tin plated; 12% chromium type corrosion-resistant steels 0.60Tin-plate; tin-lead solder 0.65
Lead, solid or plated; high lead alloys 0.70
Aluminum, wrought alloys of the 2000 Series 0.75
Iron, wrought, gray or malleable, plain carbon and low alloy steels 0.85
Aluminum, wrought alloys other than 2000 Series aluminum, cast alloys of the silicon type 0.90
Aluminum, cast alloys other than silicon type, cadmium, plated and chromate 0.95
Hot-dip-zinc plate; galvanized steel 1.20
Zinc, wrought; zinc-base die-casting alloys; zinc plated 1.25
Magnesium & magnesium-base alloys, cast or wrought 1.75
Beryllium 1.85

[Captcrafton]

Make sure you use some tef-gel, and you will be fine.

[Madchark]

Thank you for the info. I will post up some new build pictures.

T.