Straight Flush Page 2

Straight Flush - Maintenance Q & A - January 2003 - Part 2
Maintenance Q & A — January 2003
By Capt. Ken Kreisler


Straight Flush
Part 2: Galvanic Corrosion, PMY Tries... Tuf Enuf
 
 More of this Feature
• Part 1: VacuFlush, and more
• Part 2: Galvanic Corrosion, and More

 Related Resources
• Maintenance Q&A Index

How are galvanic corrosion and electrolysis different? B.E., via e-mail
Electrolysis is the chemical breakdown--otherwise known as corrosion--of an electrolyte, a liquid that can transfer ions between metals. For example, when the seawater around your boat undergoes a chemical change, that is electrolysis. It is also what happens inside your lead-acid battery when the electrolyte--battery acid--dilutes and is therefore unable to interact with the lead plates, the chemical reaction necessary to produce electricity. (Electrolytic corrosion, also known as stray-current corrosion, is caused by an external electrical current.)

Galvanic corrosion is the decomposition of one of two metals of different electrical potential--known as voltage--when they're immersed in an electrolyte. A natural battery is formed by two metals--say, a propeller made of Nibral (an alloy of nickel, bronze, and aluminum) and a prop shaft made of stainless steel--playing the role of anode and cathode, when they are immersed in seawater, an excellent current-carrying liquid. As electrons move from anode to cathode--that is, from the metal with higher electrical potential (less noble on the galvanic scale) to the one with the lower potential (more noble on the scale)--the metal deteriorates. Placing a sacrificial anode made of a metal, such as zinc, which has a high electrical potential, between the metals in the circuit will cause the zinc to decompose first and thus save the other metals.

Need help with a maintenance problem? Write to Maintenance Q & A, Power & Motoryacht, 260 Madison Ave., 8th Fl., New York, NY 10016. Fax: (917) 256-2282. e-mail: ken_kreisler@primediamags.com. No phone calls, please.

PMY Tries... Tuf Enuf
I just tried out a new product on my boat, Tuf Enuf Natural Bilge Cleaner. Actually, it's an old product--intro'd in 1993--with a new logo. Wallace and Sons of St. Augustine, Florida, bottles and sells the milky stuff that has a citrus scent both intense and Floridian. After I poured a quart into the bilge of the Scrumpy Vixen, it promptly began smelling like a freshly peeled orange, thanks to a compound called d'limonene, which the company says is derived from crushed orange peels.

What about the product's cleaning abilities? I've never been one to keep a spotless bilge, so the Scrump's nether areas were a tad grungy. Nor have I ever been one to scrub bilges with brushes and sponges, so I added a little fresh water and let the mixture slosh around for a day or so, washing-machine-style. Tuf Enuf removed some grease and grime, but not all, thereby suggesting that a complete job might call for further applications.

Since the company says the mildness of the product makes it safe on fabrics and the environment, I also tried a little on fiberglass surfaces and vinyl upholstery inside the wheelhouse. It removed smudges, dirt, and even rust stains almost instantly. Cost: $9.95 per quart and $29.95 per gallon.—Capt. Bill Pike

Wallace & Sons Phone: (800) 223-5969. www.tufenuf.com.

Previous page > VacuFlush, and more > Page 1, 2

This article originally appeared in the January 2003 issue of Power & Motoryacht magazine.

Vetus Maxwell Tip of the Week

Hot Today

Featured Brands

Cutwater MCY logo
HMY Yacht Sales logo Ocean Alexander logo
Imtra logo Volvo Penta logo

Select Brokerage

Brokerage Listings Powered by BoatQuest.com