ofshore

OK, now you've confused me, which isn't hard I know, is there such thing as an aluminum anode??? The whole point of anodes is to have a metal in contact with your existing hardware that is less noble causing it to corrode first. What would be the point of putting an aluminum anode on an aluminum drive??

Reed Jensen

The aluminum anode is left bare to dissolve... the rest of the part is painted.

Reed Jensen

I'll post an anode chart.... the metal on top protects the metals below it.
GALVANIC SERIES OF METALS AND ALLOYS
CORRODED END ( ANODIC OR LEAST NOBLE)
MAGNESIUM
MAGNESIUM ALLOYS
ZINC
ALUMINUM 5052, 3004, 3003, 1100, 6053
CADMIUM
ALUMINUM 2117, 2017, 2024
MILD STEEL (1018), WROUGHT IRON
CAST IRON, LOW ALLOY HIGH STRENGTH STEEL
CHROME IRON (ACTIVE)
STAINLESS STEEL, 430 SERIES (ACTIVE)
302, 303, 304, 321, 347, 410,416, STAINLESS STEEL (ACTIVE)
NI - RESIST
316, 317, STAINLESS STEEL (ACTIVE)
CARPENTER 20CB-3 STAINLESS (ACTIVE)
ALUMINUM BRONZE (CA 687)
HASTELLOY C (ACTIVE) INCONEL 625 (ACTIVE) TITANIUM (ACTIVE)
LEAD-TIN SOLDERS
LEAD
TIN
INCONEL 600 (ACTIVE)
NICKEL (ACTIVE)
60 NI-15 CR (ACTIVE)
80 NI-20 CR (ACTIVE)
HASTELLOY B (ACTIVE)
BRASSES
COPPER (CA102)
MANGANESE BRONZE (CA 675), TIN BRONZE (CA903, 905)
SILICONE BRONZE
NICKEL SILVER
COPPER - NICKEL ALLOY 90-10
COPPER - NICKEL ALLOY 80-20
430 STAINLESS STEEL
NICKEL, ALUMINUM, BRONZE (CA 630, 632)
MONEL 400, K500
SILVER SOLDER
NICKEL (PASSIVE)
60 NI- 15 CR (PASSIVE)
INCONEL 600 (PASSIVE)
80 NI- 20 CR (PASSIVE)
CHROME IRON (PASSIVE)
302, 303, 304, 321, 347, STAINLESS STEEL (PASSIVE)
316, 317, STAINLESS STEEL (PASSIVE)
CARPENTER 20 CB-3 STAINLESS (PASSIVE), INCOLOY 825
NICKEL - MOLYBDEUM - CHROMIUM - IRON ALLOY (PASSIVE)
SILVER
TITANIUM (PASS.) HASTELLOY C & C276 (PASSIVE), INCONEL 625(PASS.)
GRAPHITE
ZIRCONIUM
GOLD
PLATINUM
PROTECTED END (CATHODIC OR MOST NOBLE)

Chris288

Thanks again Reediddy...

fund razor

Reed you are totally right, and you were paying attention in chemistry class.

But, there's fresh water, and then there's clean water.

There is some pretty nasty fresh water around where I live. Like the river with the 100 years of Jeep plant pollution that I used to keep my boat in.
It was brown and would turn my stainless cloudy in a day. The clams glowed in the dark.

There was one heck of a lot of "medium" for electrolysis in that "fresh" water.

zahndok

So, What anode comes standard on the Merc Bravo drives? Or is this the discretion of the builder?

Reed Jensen

Probably zinc..... zinc will protect in any water.... for fresh water, magnesium is better... If you were to put magnesium anodes on in salt water... they would protect too... but would dissolve quickly.

Reed Jensen

Oh yeah... I forgot... you're in Toledo... where the Maumee catches on fire..... ( my ex-wife was from Toledo ).........

fund razor

Is she hot? Did she move back?

Reed Jensen

Uhhhh.... dunno.... I haven't seen her in 20 years.... but I heard she is still living in SLC.... but her family name is .......... Penske............