Cosmetic Care & Maintenance
7-23
Galvanic/Stray Current Corrosion
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.
Speci
fi
cally 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 23 OBX
Page 1: ...OWNER S MANUAL 23 OBX...
Page 2: ...REGAL 221734 OWNER S MANUAL 12 2015 23 OBX...
Page 7: ...INT 7 Introduction THIS PAGE IS LEFT INTENTIONALLY BLANK...
Page 18: ...INT 18...
Page 38: ...1 16 CHAPTER 1 NAVIGATION LIGHT RULES...
Page 41: ...1 19 Safety On Board...
Page 83: ...CHAPTER 3 3 16...
Page 142: ...Equipment Operation 6 3 Standard Battery Switch Circuitry Front View...
Page 143: ...CHAPTER 6 6 4 Standard Battery Switch Circuitry Rear View...
Page 145: ...CHAPTER 6 6 6 Dual Battery Switch Circuitry Front View...
Page 146: ...Equipment Operation 6 7 Dual Battery Switch Circuitry Rear View...
Page 151: ...CHAPTER 6 6 12 TYPICAL TONNEAU BOW COVER BOW COVER COCKPIT COVER...
Page 152: ...Equipment Operation 6 13 CANVAS TRAVEL COVER...
Page 168: ...Equipment Operation 6 29 Typical Hinged Power Tower Actuator Hydraulic Ram Typical Power Tower...
Page 236: ...CHAPTER 9 Notes...
Page 265: ...12 11...
Page 267: ...12 13 STEREO PERFORMANCE PACKAGE HARNESS RUN...
Page 268: ...12 14 FUSE BLOCK OVERVIEW...
Page 269: ...Technical Information 12 15...
Page 270: ...12 16...
Page 271: ...Technical Information 12 17...
Page 272: ...12 18 TYPICAL DASH WIRING WITH GARMIN 7606...
Page 273: ...Technical Information 12 19 TYPICAL DECK HARNESS BREAKOUTS...
Page 275: ...Technical Information 12 21 TYPICAL DECK HARNESS OVERVIEW...
Page 276: ...12 22 TYPICAL GARMIN YAMAHA NEMA 2000 NETWORK...
Page 282: ...12 28 Sea Star Hydraulic Assisted Steering System Typical Helm Layout...