Tech Tour Seminar SeriesTech Tour Seminar SeriesScott de Recat – Derema GroupScott de Recat – Derema Group

Corrosion 101What is Galvanic Corrosion?When a metal is immersed in an electrolyte (salt, brackish, or fresh water) small

electrical cells begin to form on the metal’s 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.

Corrosion 101

CATHODIC (LEAST ACTIVE, MORE NOBLE)

THE MORE SPACE YOU THE MORE SPACE YOU HAVE BETWEEN METALS, HAVE BETWEEN METALS, THE MORE ELECTRICAL THE MORE ELECTRICAL CURRENT IS DERIVEDCURRENT IS DERIVED

ANODIC METALS (MOST ACTIVE, LEAST NOBLE)M III - Mg (-1450 mV)

M II - AlM I - ZnGalvanized SteelAluminumMild SteelIronTinBronzeBrassNickelCopperStainless SteelSilverGold (+1420mV)

The Noble ScaleThe Noble Scale

Corrosion 101

Composition MI

Zinc Alloy MIL-A-18001K

MII Aluminum Alloy

MIL-A-24779 (SH)

MIII Magnesium Alloy

AZ-91-D

Cadmium 0.025% - 0.07% -- --

Copper 0.005% Max. 0.004% Max. 0.030% Max.

Iron 0.005% Max. 0.090% Max. 0.005% Max.

Indium -- 0.014% - 0.020% --

Lead 0.006% Max. -- --

Mercury -- 0.001 Max. --

Silicon -- 0.08% - 0.20% 0.10% Max.

Nickel -- -- 0.002%

Manganese -- -- 0.15% - 0.50%

Magnesium -- -- Remainder

Aluminum 0.1% - 0.5% Remainder 8.3% - 9.7%

Zinc** Remainder 4.0% - 6.5% 0.35% - 1.0%

**”MI Zinc anodes have a zinc purity of 99.995%

Specifications MI

Zinc Alloy

MII Aluminum

Alloy

MIII Magnesium

Alloy CAPACITY, ampere-hours per pound 355 1225 500

EFFICIENCY (test) 95% 94% 50%

CONSUMPTION, pound per ampere-year 24.5 lbs 7.6 lbs 17.5 lbs

POTENTIAL (reference Cu/CuSO4) -1050mV -1100mV -1450mV

Martyr Anode Alloy BreakdownMartyr Anode Alloy Breakdown

Corrosion 1013 Different Anodes for 3 Different Water 3 Different Anodes for 3 Different Water EnvironmentsEnvironmentsThere used to be only 1 anode type – Zinc. But over many years OEM’s, 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.

Corrosion 1013 Different Anodes for 3 Different Water 3 Different Anodes for 3 Different Water EnvironmentsEnvironments

ZnZn Salt & Brackish Water

Fresh Water Only!

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

AlAl Very Light, Dull Silver in Color “Pits” as it corrodes. Available in Commercial & Pleasurecraft lines

MgMg Extremely light. Dark Grey in Color Available in Pleasurecraft only

Used by most OEM’s

Does not work effectively in pure fresh water

Cannot be used in salt or brackish water

Corrosion 101Recent News - Anodes & The EnvironmentRecent News - Anodes & The Environment

Corrosion 101Recent News - Anodes & The EnvironmentRecent News - Anodes & The Environment

WA DOE Boatyard General Permit Guidelines – Page 14

Corrosion 101So now what are your options?So now what are your options?

Aluminum Anodes - Benefits Aluminum Anodes - Benefits

•Contain No Cadmium. Primary elements are Aluminum and Indium Contain No Cadmium. Primary elements are Aluminum and Indium which are non-toxicwhich are non-toxic

•Better efficiency and performance vs. ZincBetter efficiency and performance vs. Zinc

• Improved corrosion protectionImproved corrosion protection

• Reducing the quantity of anodes requiredReducing the quantity of anodes required

• Longer performance lifeLonger performance life

•Lighter in weight then Zinc anodesLighter in weight then Zinc anodes

•Less costly than Zinc anodesLess costly than Zinc anodes

Martyr Brands them as “Cadmium-Free” MII AnodesMartyr Brands them as “Cadmium-Free” MII Anodes

•Other companies offering Aluminum Anodes includeOther companies offering Aluminum Anodes include

• Performance Metals, Sea Shield and Reliance Performance Metals, Sea Shield and Reliance

Corrosion 101Who’s using Aluminum AnodesWho’s using Aluminum Anodes• US NavyUS Navy

• Canadian NavyCanadian Navy

• US and Canadian Ferry FleetUS and Canadian Ferry Fleet

• Oil and Gas Industry – Offshore drilling platformsOil and Gas Industry – Offshore drilling platforms

• Leading dock manufactures world wideLeading dock manufactures world wide

• All US/Japanese engine manufacturers All US/Japanese engine manufacturers

• MercuryMercury

• VolvoVolvo

• BRPBRP

• HondaHonda

• YamahaYamaha

Corrosion 101What has been written about Aluminum vs. Zinc?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 can’t be isolated, you’ll 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.”

Corrosion 101What has been written about Aluminum vs. Zinc?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! They’re lighter and last longer, so they’re a plus for your boat and for the underwater life in your marina”.

Corrosion 101What has been written about Aluminum vs. Zinc?What has been written about Aluminum vs. Zinc?Marine Log – April 2012 Issue Crowley Marine – VP of Engineering – Bill Metcalf

Crowley’s 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? “it’s based on utilization. The aluminum anodes will last longer in the water, they have a better performance life, say Metcalf”.

Corrosion 101What has been written about Aluminum vs. Zinc?What has been written about Aluminum vs. Zinc?Artist, Sport Fishing Professional, Environmentalist, Editor Guy Harvey – Summer 2012 Guy Harvey Magazine

Corrosion 101FAQ’s about Aluminum vs. Zinc?FAQ’s 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?

Corrosion 101What to look for in Anode ProtectionWhat to look for in Anode Protection

QualityQuality

• 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 AnodesProduct 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!)

Corrosion 101What does Martyr have to offer?What does Martyr have to offer?

Customer Service/ SupportCustomer 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

Corrosion 101Did we mention support…Did we mention support…

CatalogsPosters/ Flyers

POP ItemsWebsite

www.martyranodes.com www.martyranodes.com

Website

www.martyranodes.com

Website

www.martyranodes.com

Website

Corrosion 101Did we mention support…Did we mention support…

Custom FAB’s Sell Sheet Available

Just ask!

Corrosion 101