Tech Tour Seminar Series Scott de Recat

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Tech Tour Seminar SeriesScott de Recat Derema
Group
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Corrosion 101
What is Galvanic Corrosion?
When a metal is immersed in an electrolyte (salt,
brackish, or fresh water) small electrical cells
begin to form on the metals surface as a result
of a chemical reaction. In time, the metal
becomes polarized and material is lost from the
anodic pole of these cells. This causes the
damage we know as galvanic corrosion. An even
stronger effect is produced when two different
metals are electrically connected in the same
electrolyte.
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Corrosion 101
The Noble Scale
ANODIC METALS (MOST ACTIVE, LEAST NOBLE)
M III - Mg (-1450 mV) M II - Al M I -
Zn Galvanized Steel Aluminum Mild
Steel Iron Tin Bronze Brass Nickel Copper Stainles
s Steel Silver Gold (1420mV)
THE MORE SPACE YOU HAVE BETWEEN METALS, THE MORE
ELECTRICAL CURRENT IS DERIVED
CATHODIC (LEAST ACTIVE, MORE NOBLE)
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Corrosion 101
Martyr Anode Alloy Breakdown
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Corrosion 101
3 Different Anodes for 3 Different Water
Environments
There used to be only 1 anode type Zinc. But
over many years OEMs, boat builders and the
general boating public realized that there were
too many variables when it comes to key boating
areas and proper protection and thus the
evolution of 3 different anode alloys.
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Corrosion 101
3 Different Anodes for 3 Different Water
Environments

• Salt Water Only!
• Does not work in fresh brackish water
• Very Heavy and Shiny
• Looks sandblasted as it corrodes.
• Readily Available.

Zn
Al

• Salt Brackish Water

• Does not work effectively in pure fresh water

• Very Light, Dull Silver in Color

• Pits as it corrodes.

• Available in Commercial Pleasurecraft lines

• Used by most OEMs

• Fresh Water Only!

Mg

• Cannot be used in salt or brackish water

• Extremely light. Dark Grey in Color

• Available in Pleasurecraft only

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Corrosion 101
Recent News - Anodes The Environment
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Corrosion 101
Recent News - Anodes The Environment
WA DOE Boatyard General Permit Guidelines Page
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Corrosion 101
So now what are your options?

• Aluminum Anodes - Benefits
• Contain No Cadmium. Primary elements are Aluminum
  and Indium which are non-toxic
• Better efficiency and performance vs. Zinc
• Improved corrosion protection
• Reducing the quantity of anodes required
• Longer performance life
• Lighter in weight then Zinc anodes
• Less costly than Zinc anodes
• Martyr Brands them as Cadmium-Free MII Anodes
• Other companies offering Aluminum Anodes include
• Performance Metals, Sea Shield and Reliance

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Corrosion 101
Whos using Aluminum Anodes

• US Navy
• Canadian Navy
• US and Canadian Ferry Fleet
• Oil and Gas Industry Offshore drilling
  platforms
• Leading dock manufactures world wide
• All US/Japanese engine manufacturers
• Mercury
• Volvo
• BRP
• Honda
• Yamaha

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Corrosion 101
What has been written about Aluminum vs. Zinc?
Seaworthy/ Boat US Standards Below the
waterline, when you have a stainless steel shaft
and a bronze prop, which cant be isolated,
youll need an anode either zinc, magnesium or
aluminum that will be sacrificed to save the
fitting. Zinc can be used in saltwater magnesium
can be used in freshwater (never in salt or
brackish water) but the most widely affective
anodes these days are being made of aluminum,
which can last up to 50 longer, and remain
active in brackish and saltwater. How, you may
ask, does an aluminum anode protect an aluminum
outdrive? The answer is that an anode is made
with an aluminum alloy that is significantly
different (more anodic) than the alloy used on an
outdrive.
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Corrosion 101
What has been written about Aluminum vs. Zinc?
West Advisor Getting rid of Cadmium and
Zinc Zinc and cadmium are elements used in
traditional salt-water anodes that are suspected
of causing environmental damage. CMP Global has
re-formulated their product, removing these
alloys for safer more green anodes. A rare bit
of good news for the boater these new
formulations actually work better! Theyre
lighter and last longer, so theyre a plus for
your boat and for the underwater life in your
marina.
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Corrosion 101
What has been written about Aluminum vs. Zinc?
Marine Log April 2012 Issue Crowley Marine
VP of Engineering Bill Metcalf
Crowleys vice president, Engineering, and a
30-year Crowley veteran, Bill Metcalf says the
company has used aluminum anodes since before I
joined the company. The reason? its based on
utilization. The aluminum anodes will last longer
in the water, they have a better performance
life, say Metcalf.
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Corrosion 101
What has been written about Aluminum vs. Zinc?
Artist, Sport Fishing Professional,
Environmentalist, Editor Guy Harvey Summer
2012 Guy Harvey Magazine
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Corrosion 101
FAQs about Aluminum vs. Zinc?

• Can I use aluminum anodes on my aluminum boat?
• Why doesn't Martyr produce aluminum pencil
  anodes?
• Can I mix aluminum anodes with zinc anodes?

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Corrosion 101
What to look for in Anode Protection

• Quality
• MIL Spec Products are critical Reliable
  Performance.
• Products produced in an ISO 9001 Certified
  Facility
• In-house lab testing ensures adherence to the Mil
  Spec alloy material (zinc, aluminum magnesium)
  
• Approved vendor to many OEM, Government
  Military organizations around the world

• Product Availability - Bulk Packaged Anodes
• Product availability in all 3 alloys (only
  manufacturer to do so)
• Products available for most popular marine
  engines/ systems
• Key boatyard products including commercial plates
• 2 choices of shaft/ rudder/ collar hardware hex
  slotted in stainless
• Over 50 new products launched every year (over
  400 parts now!)

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Corrosion 101
What does Martyr have to offer?

• Customer Service/ Support
• Factory Rep support in the field
• Factory personnel trained in Corrosion Control
  through NACE
• Worldwide distribution network
• Fisheries Supply
• Diversified Marine Products
• Redden Marine
• Port Supply
• Large range of support material available

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Corrosion 101
Did we mention support
Website
Website
Website
www.martyranodes.com
www.martyranodes.com
www.martyranodes.com
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Corrosion 101
Did we mention support
Custom FABs Sell Sheet Available Just ask!
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Corrosion 101
QUESTIONS?