MME Group Anode - Booklet

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Page: CONTENTS: 2 Alloy speci cation of standard sacri cial anodes

3 Choosing zinc or aluminium anodes

4 Anode recommendations

5 Choosing tank anodes

WELD-ON HULL ANODES

7 - 28 Aluminium weld on hull anodes30 - 46 Zinc weld on hull anodes

BOLT-ON ANODES / DISC ANODES

48 - 58 Aluminium bolt on hull anodes (with 2 bolting holes)

60 - 70 Zinc bolt on hull anodes (with 2 bolting holes)

72 - 77 Aluminium bolt-on disc anodes (with 1 bolting hole)

79 - 86 Zinc bolt-on disc anodes (with 1 bolting hole) TANK ANODES

88 - 101 Aluminium tank anodes

103 - 116 Zinc tank anodes

PITGUARD ANODES

118 - 121 Aluminium pitguard anodes (including 1 clamp per anode)

123 - 127 Zinc pitguard anodes (including 1 clamp per anode) PENCIL / ROD ANODES

129 Zinc pencil anodes + brass plugs for pencil anodes

131 Zinc rod anodes (solid / massive zinc anode bar, excl. holes, excl. insert)

MOUNTING MATERIAL

133 Stud assembly for bolt-on anodes

134 M-clamp installation for tank anodes in general135 M-clamps for tank anodes (2 clamps per anode required)


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GENERALThe below mentioned alloys have been chosen with great care to ensure an evencorrosion pattern, reliable electrical capacity and a long working life. These alloys areused for standard sacri cial anodes. On request Materiaal Metingen Europe can castanodes with different alloy speci cations.

ALUMINIUM ALLOY

Element Range (%)Zinc (Zn) 3.50 - 5.00Titanium (Ti) 0.01 - 0.05Silicon (Si) 0.05 - 0.20Bismuth (Bi) 0.05 - 0.15Indium (In) 0.02 - 0.05Copper (Cu) 0.01 maxIron (Fe) 0.15 maxOthers each 0.10 max

Aluminium Balance

Nominal electrical capacity: 2700 AmpHr/KgNominal open circuit potential: -1100 mV vs Ag/AgCl (seawater) reference cell

Element Range (%) Aluminium (Al) 0.10 - 0.5

Cadmium (Cd) 0.025 - 0.07Copper (Cu) 0.005 maxIron (Fe) 0.005 maxLead (Pb) 0.006 maxOthers total 0.10 maxZinc (Zn) BalanceNominal electrical capacity: 780 AmpHr/KgNominal open circuit potential: -1050 mV vs Ag/AgCl (seawater) reference cell

The copper, iron and lead contents of our normal zinc alloys are usually less then 0.003%each.

ZINC ALLOY acc. US MIL Spec. A-18001K

ALLOY SPECIFICATIONS OF

STANDARD SACRIFICIAL ANODES

A LONGER LIFE


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GENERALTraditionally many companies prefer to use zinc instead of aluminium. MME advices theuse of aluminium instead of zinc for the following reasons:

1. Price of anode material

Due to the fact that the capacity of aluminium (2700 A hr/Kg) is almost 3.5 times

higher than zinc (780 A hr /Kg) the total amount of required anode material (Kg) isless. This results in a cheaper Cathodic Protection System to that given by zinc withan equal level of protection.

2. Price of Installation As the total weight of anode material for a system using aluminium is less comparedto a system using zinc anodes the installation costs for a system using aluminiumanodes will also be less.

3. Multi EffectiveIn brackish water aluminium anodes work more effectively than zinc, due to thehigher driving voltage of aluminium.

4. Environmental PollutionCompared to aluminium alloys, zinc is considered to be less neutral to theenvironment.

For anodes used in water ballast and other tanks see chapter Choosing tank anodes(page 5).

CHOOSING ZINC OR ALUMINIUM AS

ALLOY FOR SACRIFICIAL ANODES

A LONGER LIFE


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Saltwater

Brackish Water

Fresh Water

Zn Al Mg

Zn Al Mg

Zn Al Mg

In saltwater, both Zinc and Aluminium are suitable, but aluminium has a better re-activationperformance.

Aluminium is the recommended material for brackish water.

On pure fresh water magnesium is the best performing anode material.With polluted water or when a boat is temporary in brackish water, aluminium is the preferred

anode.

The recommendations apply to steel structures. For more detailed information, pleaseconsult your local distributor.

ANODE RECOMMENDATIONS

A LONGER LIFE


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GENERALTraditionally many vessels are tted with sacri cial anodes for external protection (hull).For achieving the same protection of the internal construction of the vessel (mainly waterballast tanks) sacri cial anodes can also be used. However due, to the fact that tanksare inherently complex structures as well as being con ned spaces, the use of anodeshas to be well engineered and the following rules adhered to:

1. Effect of ballast tank anodes

The ballast tank anodes will be without effect when the ballast tanks are empty. Itwill take some time to obtain full effect (polarisation) of submerged steel surfacesafter lling with seawater. In the ullage space or under deck area on top of tanks theanodes will not be effective unless the tank is completely lled.

2. The use of zinc / aluminium or magnesium alloy anodes

Anode alloy materials based on zinc or aluminium are acceptable, magnesium alloyis not allowed. Ballast tanks adjacent to tanks for liquid cargo with a ash point< 60 C are to be considered as dangerous areas. Aluminium alloy anodes are to belocated in such way that the kinetic energy which is developed in case of loosening

and falling down will be < 275 J. This means that in these areas the maximum height(in mtr) of an aluminium anode above tank bottom, deck or stringer may not exceedthe value obtained by 28 / W, where W is the gross weight of the anode.Furthermore classi cation societies may require structures to be installed to protectthe aluminium anodes from being hit by falling objects. Please consult your localsurveyor / classi cation society branch of ce for full details.

3. Welding or bolting type anodesFor a good operation of the anodes it is vital to have a good electrical conductivitybetween the ship structure and the anodes. This can be obtained either by welding

(preferably) or bolting the anodes to the ship structure. In case bolting type anodesare requested the optional M clamps can be used (see page 122).

For the pros and cons of the use of zinc or aluminium alloys for sacri cial anodes usedsee chapter Choosing zinc or aluminium as alloy for sacri cial anodes (page 3).

CHOOSING TANK ANODES

A LONGER LIFE


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ALUMINIUMWELD-ONHULL ANODES


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ZINCWELD-ONHULL ANODES


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ALUMINIUMBOLT-ONHULL ANODES


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M M E 2 4 Z B


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ZINCBOLT-ONDISC ANODES


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ALUMINIUMTANK ANODES


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ZINCTANK ANODES


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ALUMINIUMPITGUARD ANODES


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ZINCPITGUARD ANODES


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ZINCPENCIL ANODES


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ZINCROD ANODES


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MOUNTING MATERIAL


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MME Group has a large, professional and fully ownedfoundry for the manufacturing of sacricial anodes for the

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MME Group Anode - Booklet

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