Aluminum lifeboats are subject to damage by electrolytic corrosion (the aluminum being eaten away). In working around boats of aluminum you must be very careful __________.
• Electrolytic (galvanic) corrosion between different metals • Behavior of aluminum in contact with steel or iron in a wet/salty environment • Whether adding electric current or salt water increases or decreases corrosion
• Which choice would reduce the chance of dissimilar metals forming a corrosion cell on an aluminum boat? • What happens when steel or iron contacts aluminum and both are exposed to moisture or salt water? • Do we usually fight corrosion by adding more salt water or electricity, or by limiting metal contact and keeping things dry?
• Identify which choice would limit contact between dissimilar metals near the aluminum hull • Eliminate any options that would intentionally increase salt exposure or electric current on the hull • Think about standard good practice on aluminum vessels: what do crews actually avoid leaving on deck or against the hull?
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