Cosmetic Care & Maintenance
7-19
Typically electrons flow from the anode (the aluminum drive unit),via
the external conducting path to the cathode (stainless steel propeller).
If there is a very large anode connected to a small cathode, the anode
will corrode very slowly. If a very large cathode is connected to a small
anode, the anode will corrode very quickly. Obviously, if you do not
control galvanic corrosion, over time the aluminum will corrode away.
The first sign of galvanic corrosion is paint blistering (starting on sharp
edges) below the water line- a white powdery substance forms on the
exposed metal areas. As the corrosion advances, the exposed metal will
become deeply pitted as the metal is actually eaten away.
Another condition which will increase galvanic corrosion is the removal
or reduction in surface area of the sacrificial anodes. Never add
aftermarket products that are connected to the engine ground such as
stainless steel steering aids and trim planes.
Zinc connected to aluminum will form a corrosion cell but the
aluminum (drive) becomes the cathode and the zinc (anode) corrodes.
Even though your boat may not have shore power aboard current from
nearby vessels with shore power can produce stray current galvanic
corrosion. Stray current corrosion occurs when metal with an electrical
current flowing into it is immersed in water that is grounded (lake,
ocean, pond). The current can leave the metal and flow through the
water to ground. This will cause rapid corrosion of the metal at the
point where the current leaves.
When a vessel nearby is plugged into shore power, they can potentially
tie your aluminum drive unit to their boat via the green grounding shore
power lead. Your aluminum drive unit could be the receiving end of
a large galvanic cell (a battery) interconnected with nearby vessels or
even through the marina’s metal structures via their electrical system.
https://www.boat-manuals.com/
Summary of Contents for 33 OBX
Page 1: ...INT INT 1 INT 1 OWNER S MANUAL 3300 33 OBX 07 02 18 https www boat manuals com ...
Page 43: ...1 17 Safety On Board NAVIGATION LIGHT RULES https www boat manuals com ...
Page 46: ...1 20 CHAPTER 1 https www boat manuals com ...
Page 68: ...CHAPTER 2 2 4 Signals https www boat manuals com ...
Page 76: ...CHAPTER 2 2 12 Notes https www boat manuals com ...
Page 91: ...Engine Controls 3 15 https www boat manuals com ...
Page 130: ...CHAPTER 4 4 18 Notes https www boat manuals com ...
Page 160: ...CHAPTER 5 5 30 Notes https www boat manuals com ...
Page 222: ...CHAPTER 6 6 62 Notes https www boat manuals com ...
Page 256: ...CHAPTER 9 9 6 Notes CHAPTER 9 https www boat manuals com ...
Page 272: ...11 8 3300 Bow Rider Dimensions 1 of 2 https www boat manuals com ...
Page 273: ...Technical Information 11 9 3300 Bow Rider Dimensions 2 of 2 https www boat manuals com ...
Page 274: ...11 10 3300 Persons Occupancy https www boat manuals com ...
Page 276: ...11 12 3300 Bow Rider Deck Hardware 2 of 5 https www boat manuals com ...
Page 277: ...Technical Information 11 13 3300 Bow Rider Deck Hardware 3 of 5 https www boat manuals com ...
Page 279: ...Technical Information 11 15 3300 Bow Rider Deck Hardware 5 of 5 https www boat manuals com ...
Page 280: ...11 16 3300 Bow Rider Hull Hardware 1 of 3 https www boat manuals com ...
Page 281: ...Technical Information 11 17 3300 Bow Rider Hull Hardware 2 of 3 https www boat manuals com ...
Page 282: ...11 18 3300 Bow Rider Hull Hardware 3 of 3 https www boat manuals com ...
Page 286: ...11 22 3300 Bow Rider Fresh Water System 2 of 2 https www boat manuals com ...
Page 288: ...11 24 3300 Bow Rider Waste Water System 2 of 2 https www boat manuals com ...
Page 289: ...Technical Information 11 25 3300 Bow Rider DC Head Panel https www boat manuals com ...
Page 290: ...11 26 3300 Bow Rider Helm Switch Panel https www boat manuals com ...
Page 291: ...Technical Information 11 27 3300 Bow Rider Helm Breaker Panel https www boat manuals com ...
Page 292: ...11 28 3300 Bow Rider Volvo IGN MERC Analog EVC https www boat manuals com ...
Page 293: ...Technical Information 11 29 3300 Bow Rider IPA Volvo MERC Analog https www boat manuals com ...
Page 294: ...11 30 3300 Bow Rider IPA Volvo MERC Analog w Garmin https www boat manuals com ...
Page 296: ...11 32 3300 Bow Rider Aft Switch Panel https www boat manuals com ...
Page 297: ...Technical Information 11 33 3300 Bow Rider Windlass Panel https www boat manuals com ...
Page 305: ...Technical Information 11 41 33 OBX Persons Occupancy https www boat manuals com ...
Page 306: ...11 42 33 OBX Deck Plan https www boat manuals com ...
Page 307: ...Technical Information 11 43 33 OBX Main Dimensions https www boat manuals com ...
Page 308: ...11 44 33 OBX Hull Hardware 1 of 3 https www boat manuals com ...
Page 309: ...Technical Information 11 45 33 OBX Hull Hardware 2 of 3 https www boat manuals com ...
Page 310: ...11 46 33 OBX Hull Hardware 3 of 3 https www boat manuals com ...
Page 311: ...Technical Information 11 47 33 OBX Strong Point Cleat Installation https www boat manuals com ...
Page 312: ...11 48 33 OBX Deck Hardware 1 of 5 https www boat manuals com ...
Page 313: ...Technical Information 11 49 33 OBX Deck Hardware 2 of 5 https www boat manuals com ...
Page 314: ...11 50 33 OBX Deck Hardware 3 of 5 https www boat manuals com ...
Page 315: ...Technical Information 11 51 33 OBX Deck Hardware 4 of 5 https www boat manuals com ...
Page 316: ...11 52 33 OBX Deck Hardware 5 of 5 https www boat manuals com ...
Page 317: ...Technical Information 11 53 33 OBX Sling Locations https www boat manuals com ...
Page 318: ...11 54 33 OBX Waste Hose Routing 1 of 2 https www boat manuals com ...
Page 319: ...Technical Information 11 55 33 OBX Waste Hose Routing 2 of 2 https www boat manuals com ...
Page 320: ...11 56 33 OBX A C Hose Routing 1 of 2 https www boat manuals com ...
Page 321: ...Technical Information 11 57 33 OBX A C Hose Routing 2 of 2 https www boat manuals com ...
Page 322: ...11 58 33 OBX Water Hose Routing https www boat manuals com ...
Page 323: ...Technical Information 11 59 33 OBX Fuel Tank Installation https www boat manuals com ...
Page 324: ...11 60 33 OBX Block Overview https www boat manuals com ...
Page 325: ...Technical Information 11 61 33 OBX Typical Switch Panel Breakout https www boat manuals com ...
Page 326: ...11 62 33 OBX Typical Dash Chartplotter Breakout https www boat manuals com ...