bronze composition

[ebb]

naval bronze (brass) 464
% 60 - copper
39.25 - zinc
.75 - tin

manganese bronze 675
% 58.50 - copper
39.25 - zinc
1 - tin
.25 - manganese
1 - iron

everdur 655
% 95.8 - copper
3.1 - silicon
1 - manganese

These alloys come in hard and soft versions.
ANY bronze alloy with over 25% zinc is subject to dezincification. (actual fact)

Which of these bronzes are subject to dezincing?

Three guesses.


IMCO, modern marinas will dezinc anything.
Marinas in the '60s were not hot like they are today. Agree?
Galvanic corrosion can potentially affect any metal immersed in an electrolyte. Alloys with tin make them particularly strong and corrsion resistent. Above the waterline. Strive to keep all metals in the water the same alloy. Shaft, shoe, rod, bolts, pins, thru hulls. Put sacrificial zincs everywhere.