mme sacrificial anodes booklet
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A Longer Life
SACRIFICIAL ANODES
www.mme-group.com
Hull Anodes
Bolt-on Anodes / Disc Anodes
Tank Anodes
Pitguard Anodes
Pencil / Rod Anodes
Mounting Material
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Page: CONTENTS: 2 Alloy specification of standard sacrificial 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 - 48 Zinc weld on hull anodes50 - 55 Magnesium weld on hull anodes
BOLT-ON HULL ANODES57 - 68 Aluminium bolt on hull anodes (with 2 bolting holes)70 - 81 Zinc bolt on hull anodes (with 2 bolting holes)83 - 86 Magnesium bolt on hull anodes (with 2 bolting holes)
BOLT-ON DISC ANODES88 - 93 Aluminium bolt-on disc anodes (with 1 bolting hole)95 - 102 Zinc bolt-on disc anodes (with 1 bolting hole)104 Magnesium bolt-on disc anodes (with 1 bolting hole)
TANK ANODES106 - 121 Aluminium tank anodes123 - 136 Zinc tank anodes
PITGUARD ANODES138 - 141 Aluminium pitguard anodes (including 1 clamp per anode)143 - 147 Zinc pitguard anodes (including 1 clamp per anode)
PENCIL / ROD ANODES149 Zinc pencil anodes + brass plugs for pencil anodes151 Zinc rod anodes (solid / massive zinc anode bar, excl. holes, excl. insert)
MOUNTING MATERIAL153 - 154 Stud assembly for bolt-on anodes155 M-clamp installation for tank anodes in general156 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 even corrosion pattern, reliable electrical capacity and a long working life. These alloys are used for standard sacrificial anodes. On request Materiaal Metingen Europe can cast anodes with different alloy specifications.
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 maxAluminium Balance
Nominal electrical capacity: 2700 AmpHr/KgNominal open circuit potential: -1100 mV vs Ag/AgCl (seawater) reference cell
Element Range (%)Aluminium (Al) 0.10 - 0.5Cadmium (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 the use 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) is less. This results in a cheaper Cathodic Protection System to that given by zinc with an equal level of protection.
2. Price of InstallationAs the total weight of anode material for a system using aluminium is less compared to a system using zinc anodes the installation costs for a system using aluminium anodes will also be less.
3. Multi EffectiveIn brackish water aluminium anodes work more effectively than zinc, due to the higher driving voltage of aluminium.
4. Environmental PollutionCompared to aluminium alloys, zinc is considered to be less neutral to the environment.
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-activation performance.
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, please consult your local distributor.
ANODE RECOMMENDATIONS
A LONGER LIFE
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GENERALTraditionally many vessels are fitted with sacrificial anodes for external protection (hull). For achieving the same protection of the internal construction of the vessel (mainly water ballast tanks) sacrificial anodes can also be used. However due, to the fact that tanks are inherently complex structures as well as being confined spaces, the use of anodes has 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. It will take some time to obtain full effect (polarisation) of submerged steel surfaces after filling with seawater. In the ullage space or under deck area on top of tanks the anodes will not be effective unless the tank is completely filled.
2. The use of zinc / aluminium or magnesium alloy anodes
Anode alloy materials based on zinc or aluminium are acceptable, magnesium alloy is not allowed. Ballast tanks adjacent to tanks for liquid cargo with a flash point < 60 C are to be considered as dangerous areas. Aluminium alloy anodes are to be located 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 exceed the value obtained by 28 / W, where W is the gross weight of the anode. Furthermore classification societies may require structures to be installed to protect the aluminium anodes from being hit by falling objects. Please consult your local surveyor / classification society branch office for full details.
3. Welding or bolting type anodesFor a good operation of the anodes it is vital to have a good electrical conductivity between 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 anodes are requested the optional M clamps can be used (see page 134).
For the pros and cons of the use of zinc or aluminium alloys for sacrificial anodes used see chapter Choosing zinc or aluminium as alloy for sacrificial anodes (page 3).
CHOOSING TANK ANODES
A LONGER LIFE
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ALUMINIUM WELD-ON HULL ANODES
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ZINC WELD-ON HULL ANODES
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MAGNESIUM WELD-ON HULL ANODES
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ALUMINIUM BOLT-ON HULL ANODES
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MM
E03
AB
Net
t Wei
ght:
0.37
Kg
Gro
ss W
eigh
t:0.
46 K
g
BA
C
BA
C
21
21
Mat
eria
al M
etin
gen
Eur
ope
bvR
ietd
ekke
rstra
at 1
6P
.O. B
ox 4
222
2980
GE
Rid
derk
erk
Net
herla
nds
Tel.
+31
(0)1
80-4
8 28
28
Fax
+31
(0)1
80-4
6 22
41
ww
w.m
me-
grou
p.co
m
Pro
ject
ion:
Sca
le:
Ord
er n
umbe
r:
Dra
wn:
Che
cked
:
Dat
e:
Dat
e:
App
rove
d:
Pro
ject
:
Dw
g:C
opyr
ight
MM
E. N
o pa
rt of
this
dra
win
g m
ay b
e co
pied
, dis
clos
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r mad
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, in
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form
, with
out p
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n co
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ater
iaal
Met
inge
n E
urop
e.
Rev.Description:Date:
Dat
e:
She
et
Alu
min
ium
Allo
y B
olt O
n H
ull A
node
MM
E 0
3AB
MM
E 0
3AB
1:1.
5
FZE
30-0
1-17
PdG
30-0
1-17
PP
30-0
1-17
1/1
A4
Not
e:A
ll di
men
sion
s an
d w
eigh
ts a
re n
omin
al. D
imen
sion
s in
mm
All
data
is s
ubje
ct to
cha
nge
with
out p
rior n
otic
eA
node
is fi
tted
with
hol
es s
uita
ble
for M
10 s
tuds
and
nut
sA
node
can
als
o be
pro
vide
d w
ith b
acki
ng s
heet
or b
acks
ide
coat
ed
150
6030
3
22
11
25
11
80
Alu
min
ium
allo
y sp
ecifi
catio
nC
ompo
nent
sIm
purit
ies
Per
cent
age
(%)
Sili
con
0.05
- 0.
20Zi
nc3.
50 -
5.00
Tita
nium
0.01
- 0.
05B
ism
uth
0.05
- 0.
15In
dium
0.02
- 0.
05A
lum
iniu
mR
emai
nder
Cop
per
0.01
max
Iron
0.15
max
Oth
ers
each
0.02
max
Oth
ers
tota
l0.
05 m
ax
Ele
ctro
chem
ical
cap
acity
:27
00 A
Hr /
Kg
nom
inal
Sol
utio
n po
tent
ial:
-110
0 m
V v
s. A
g / A
gCI r
efer
ence
cel
l nom
inal
(in
seaw
ater
)
Oth
er s
peci
ficat
ions
are
ava
ilabl
e on
requ
est.
8
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ZINC BOLT-ON HULL ANODES
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MM
E01
ZB
Net
t Wei
ght:
1.0
Kg
Gro
ss W
eigh
t:1.
1 K
g
BA
C
BA
C
21
21
Mat
eria
al M
etin
gen
Eur
ope
bvR
ietd
ekke
rstra
at 1
6P
.O. B
ox 4
222
2980
GE
Rid
derk
erk
Net
herla
nds
Tel.
+31
(0)1
80-4
8 28
28
Fax
+31
(0)1
80-4
6 22
41
ww
w.m
me-
grou
p.co
m
Pro
ject
ion:
Sca
le:
Ord
er n
umbe
r:
Dra
wn:
Che
cked
:
Dat
e:
Dat
e:
App
rove
d:
Pro
ject
:
Dw
g:C
opyr
ight
MM
E. N
o pa
rt of
this
dra
win
g m
ay b
e co
pied
, dis
clos
ed, o
r mad
epu
blic
, in
any
form
, with
out p
rior w
ritte
n co
nsen
t of M
ater
iaal
Met
inge
n E
urop
e.
Rev.Description:Date:
Dat
e:
She
et
Zinc
Allo
y B
olt O
n H
ull A
node
MM
E 0
1ZB
MM
E 0
1ZB
1:1.
5
FZE
30-0
1-17
PdG
30-0
1-17
PP
30-0
1-17
1/1
A4
Zinc
allo
y sp
ecifi
catio
ns a
cc. U
S M
il. S
pec-
A-1
8001
KC
ompo
nent
sIm
purit
ies
Per
cent
age
(%)
Cad
miu
m0.
025
- 0.0
7A
lum
iniu
m0.
10 -
0.5
Zinc
Rem
aind
erC
oppe
r0.
005
max
Iron
0.00
5 m
axLe
ad0.
006
max
Oth
ers
tota
l0.
10 m
ax
Ele
ctro
chem
ical
cap
acity
:78
0 A
Hr/K
g no
min
alS
olut
ion
pote
ntia
l:-1
050m
V v
s. A
g/A
gCI r
efer
ence
cel
l nom
inal
(in
seaw
ater
)
Oth
er s
peci
ficat
ions
are
ava
ilabl
e on
requ
est.
Not
e:A
ll di
men
sion
s an
d w
eigh
ts a
re n
omin
al. D
imen
sion
s in
mm
All
data
is s
ubje
ct to
cha
nge
with
out p
rior n
otic
eA
node
is fi
tted
with
hol
es s
uita
ble
for M
10 s
tuds
and
nut
sA
node
can
als
o be
pro
vide
d w
ith b
acki
ng s
heet
or b
acks
ide
coat
ed
6030
3
22
11
25
11
8
150
80
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MM
E 24
ZB
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MAGNESIUM BOLT-ON HULL ANODES
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ZINCBOLT-ON DISC ANODES
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MAGNESIUM BOLT-ON DISC ANODES
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ALUMINIUMTANK ANODES
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ZINC TANK ANODES
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ALUMINIUMPITGUARD ANODES
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ZINCPITGUARD ANODES
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ZINC PENCIL ANODES
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ZINC ROD ANODES
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MOUNTING MATERIAL
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MME GroupRietdekkerstraat 16PO Box 42222980 GE RidderkerkThe Netherlands
T: +31 (0)180 48 28 28F: +31 (0)180 46 22 41
E: sa@mme-group.comI: www.mme-group.com
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of know-how and experience
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