227
Galvanic Corrosion/Stray Current
Metal parts underwater can be subjected to two
basic styles of electrolysis: galvanic corrosion
and stray current corrosion. Both can damage the
outboard drive, propeller, underwater parts, boat
and motor if not correctly monitored (testing at 2
week intervals) and avoided.
Galvanic corrosion is an electrochemical reaction
between two or more metals. Drive systems consist
of several different metals. Some are more active
than others.
Galvanic corrosion of the more chemically active
metals can occur whenever two or more dissimilar
metals that are “grounded” (connected by actually
touching each other, or through a wire or metal
part) are immersed in a conductive solution (any
material that can conduct electricity). Anything but
pure water is conductive. Saltwater, fresh water
with a high mineral content and polluted freshwater
are highly conductive. Conductivity increases with
temperature. That is why Florida boats experience
more corrosion than boats in Maine.
Specifically look at a typical outboard marine drive
unit with a stainless steel propeller. The aluminum
is the more chemically active metal (called the
anode) and the stainless steel propeller is the less
chemically active metal (called the cathode).
CORROSION TABLE
Gold
Stainless Steel
Bronze
Copper
Brass
Steel
Aluminum
Zinc
Magnesium
Least Active
Most Active
Summary of Contents for 38 SAV 2019
Page 1: ...1 REGAL 38 SAV OWNER S MANUAL NOVEMBER 2019 EDITION...
Page 32: ...32 Navigation Light Rules...
Page 46: ...46 Navigation Rules...
Page 49: ...49 Lateral Aids...
Page 50: ...50 Channel Markers Regulatory Markers...
Page 52: ...52...
Page 53: ...53...
Page 153: ...153 Engine Starting Stopping Controls...
Page 208: ...208 TV SYSTEM COMPONENTS WIRING TV SYSTEM COMPONENTS WIRING...
Page 225: ...225 Dockside Cords...
Page 259: ...259 GENERAL ARRANGEMENTS...
Page 260: ...260 TOP VIEW...
Page 261: ...261 DOMESTIC SEATING OCCUPANCY...
Page 262: ...262 SLING LOCATIONS FOR LIFTING...
Page 265: ...265 YAMAHA OPTIMUS STEERING SYSTEM TWIN O B SHOWN...
Page 266: ...266 YAMAHA OPTIMUS FUEL HARNESS...
Page 267: ...267 GARMIN ETHERNET NETWORK NOTE GARMIN ETHERNET NETWORK LOCATED BEHIND GARMIN STBD PLOTTER...
Page 268: ...268 YAMAHA OPTIMUS NMEA NETWORK...
Page 269: ...269 AMPLIFIER SPEAKER WIRING...
Page 270: ...270 HULL HARDWARE AFT THRU HULLS...
Page 271: ...271 DECK HARDWARE OVERVIEW...
Page 272: ...272 DECK HARDWARE 1 AFT...
Page 273: ...273 DECK HARDWARE 2 BOW...
Page 274: ...274 DECK HARDWARE 4 PORT...
Page 275: ...275 DECK HARDWARE 5 TRANSOM...
Page 276: ...276 AMPLIFIER RCA WIRING SETTINGS...
Page 277: ...277 BATTERY MANAGEMENT PANEL COMPONENTS...
Page 278: ...278 BATTERY MANAGEMENT PANEL SWITCHES HARNESSES...
Page 279: ...279 BATTERY MANAGEMENT PANEL POWER CABLE OVERVIEW...
Page 280: ...280 BATTERY MANAGEMENT PANEL POWER CABLES 1...
Page 281: ...281 BATTERY MANAGEMENT PANEL POWER CABLES 2...
Page 282: ...282 BATTERY MANAGEMENT PANEL POWER CABLES 3...
Page 283: ...283 DECK HARNESS ROUTING 1...
Page 284: ...284 DECK HARNESS ROUTING 2...
Page 285: ...285 DECK HARNESS ROUTING 3...
Page 286: ...286 DECK HARNESS ROUTING 4...
Page 287: ...287 DECK HARNESS ROUTING 5...
Page 288: ...288 D C DISTRIBUTION PANEL FRONT...
Page 289: ...289 D C DISTRIBUTION PANEL REAR...
Page 290: ...290 HELM D C BREAKER PANEL FRONT...
Page 291: ...291 HELM BREAKER PANEL REAR...
Page 292: ...292 120 VOLT AC SHIP S MAIN PANEL FRONT...
Page 293: ...293 120 VOLT AC SHIP S MAIN PANEL REAR...
Page 294: ...294 SEAKEEPER WIRING...
Page 295: ...295 SUMP BILGE PUMP FLOAT SWITCH WIRING...