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Standard Potential Magnesium Anodes
|
Alloy
|
Al
|
Zn
|
Mn
|
Si
(max)
|
Cu
(max)
|
Ni
(max)
|
Fe
(max)
|
Total of impurities
(max)
|
|
AZ63B
|
5.30-6.70
|
2.50-3.50
|
0.15-0.60
|
0.08
|
0.01
|
0.001
|
0.003
|
0.30
|
|
AZ31D
|
2.5-3.5
|
0.6-1.4
|
0.2-1.0
|
0.08
|
0.01
|
0.001
|
0.002
|
0.30
|
|
AZ63C
|
5.30-6.70
|
2.50-3.50
|
0.15-0.70
|
0.30
|
0.05
|
0.003
|
0.003
|
0.30
|
Electrochemical properties
|
Open voltage(-V)
|
Closed voltage(-V)
|
Actual capacity(A.h/kg)
|
Efficiency (%)
|
|
1.50-1.55
|
1.45-1.50
|
1,230 min
|
55 min
|
Mg High Potential Anode
CORRTECH Magnesium High Potential Anode is manufactured from high quality, primary magnesium under strict, state of the art production techniques, anode chemistry, testing and certification according to ASTM97-89 standard. For these reasons, CORRTECH Magnesium High Potential Anode meets or exceeds industry standards for high potential Mg anodes andhas a longer life.
As normally required, the anode is packaged in a cloth bag with a prepared backfill mixture that works to maintain moisture around the anode and lowers the anode to earth resistance.
For farther information of packaged Mg anodes, please call CORRTECH.
|
Alloy
|
Al
|
Mn
|
Cu
|
Si
|
Fe
|
Ni
|
Other metal impurity (max)
|
Total of impurities (max)
|
|
(max)
|
(max)
|
(max)
|
(max)
|
(max)
|
||||
|
Mg-Mn
|
0.01
|
0.50-1.30
|
0.02
|
0.05
|
0.03
|
0.001
|
0.05
|
0.3
|
As per ASTM B843 Industry Standard for M1C high potential magnesium anodes.
Electrochemical properties
|
Open voltage(-V)
|
Closed voltage(-V)
|
Actual capacity
(A.h/kg)
|
Efficiency (%)
|
|
1.70-1.75
|
1.58-1.62
|
1,100 min
|
50 min
|
Mg Extruded Rod Anodes
Extruded anodes have high current to weight ratio, are suitable to be used in where a small diameter anode is required to give enough cathodic current.
CORRTECH supplies extruded anodes in both high potential (Mg-Mn alloy) and low potential (AZ31 alloy). CORRTECH's extruded anodes are typically suitable for all kinds of water heaters and water storage tanks, or in prepolarization of offshore structure etc.
CORRTECH supplies extruded anodes in both high potential (Mg-Mn alloy) and low potential (AZ31 alloy). CORRTECH's extruded anodes are typically suitable for all kinds of water heaters and water storage tanks, or in prepolarization of offshore structure etc.
Chemical composition (%)
|
Alloy
|
Al
|
Mn
|
Zn
|
Ca
|
Si
|
Cu
|
Ni
|
Fe
|
Other Imp.
|
|
|
(max)
|
(max)
|
(max)
|
(max)
|
(max)
|
(max)
|
each
|
total
|
|||
|
AZ31B
|
2.5-3.5
|
0.2-1.0
|
0.6-1.4
|
0.04
|
0.1
|
0.03
|
0.005
|
0.005
|
---
|
0.3
|
|
AZ31D
|
2.5-3.5
|
0.2-1.0
|
0.6-1.4
|
0.04
|
0.05
|
0.01
|
0.001
|
0.002
|
0.01
|
0.3
|
|
Mg-Mn
|
0.01 max
|
0.5-1.3
|
---
|
---
|
---
|
0.02
|
0.001
|
0.03
|
0.05
|
0.3
|
Specification
|
Diameter
|
Core eccentric
|
Core diameter
|
Straightness
|
Weight
|
|
(inch)
|
(inch)
|
(inch)
|
(inch/ 2 ft length)
|
(lbs/inch)
|
|
0.500-0.020
|
0.040
|
0.135
|
0.06
|
0.015
|
|
0.675-0.020
|
0.050
|
0.135
|
0.06
|
0.025
|
|
0.700-0.020
|
1/16
|
0.135
|
0.06
|
0.027
|
|
0.750-0.020
|
1/16
|
0.135
|
0.04
|
0.031
|
|
0.800-0.020
|
1/16
|
0.135
|
0.04
|
0.035
|
|
0.840-0.020
|
1/16
|
0.135
|
0.04
|
0.038
|
|
0.900-0.020
|
1/16
|
0.135
|
0.04
|
0.043
|
|
1.050-0.020
|
1/16
|
0.135
|
0.04
|
0.057
|
|
1.315-0.020
|
1/16
|
0.135
|
0.04
|
0.089
|
|
1.561-0.016
|
1/16
|
0.188
|
0.05
|
0.125
|
|
2.024-0.024
|
1/8
|
0.188
|
0.05
|
0.208
|
|
2.562-0.024
|
1/8
|
0.188
|
0.05
|
1/3
|
Mg Extruded Ribbon Anode
Mg Extruded ribbon anodes have much more surface to weight ratios, thus it will create greater current than normal cast anode.
Mg extruded anodes are normally used for protecting oil tanks or other steel structure in high resistivity electrolytes.
Mg extruded anodes are normally used for protecting oil tanks or other steel structure in high resistivity electrolytes.
Chemical composition (%)
|
Mg
|
Mn
|
Zn
|
Al
|
Cu
|
Ni
|
Fe
|
Si
|
Impurities
|
|
|
(max)
|
(max)
|
(max)
|
(max)
|
(max)
|
Each
|
Total
|
|||
|
Balance
|
0.50-1.3
|
----
|
0.01
|
0.02
|
0.001
|
0.03
|
---
|
0.05
|
0.30
|
|
Balance
|
0.20 min
|
0.7-1.3
|
2.5-3.5
|
0.01
|
0.001
|
0.002
|
0.05
|
0.05
|
0.30
|
General Specifications
|
Section (inch)
|
3/8x3/4 +- 0.015(1/8"corner)
|
|
Diameter of core (inch)
|
0.135
|
|
Core eccentric (inch)
|
<1/16
|
|
Weight (lbs/feet)
|
0.243
|
|
Standard coil length (feet)
|
1000
|
|
Coil weight (lbs)
|
243 (110kg)
|
Application
◆Pipeline and other kinds of steel structure
Mg cast rod anodes are normally use in protecting water heater from corrosion.
CORRTECH adopts advanced casting technology, supplies quality Mg cast rod anode as follows:
Chemical composition (%)
|
Alloy
|
Mg
|
Al
|
Zn
|
Mn
|
Si
|
Cu
|
Ni
|
Fe
|
Total of Impurities
(max)
|
|
(max)
|
(max)
|
(max)
|
(max)
|
||||||
|
AZ63B
|
Balance
|
5.30-6.70
|
2.50-3.50
|
0.15-0.70
|
0.1
|
0.02
|
0.002
|
0.003
|
0.3
|
Electrochemical properties
|
Open voltage (-V)
|
Closed voltage (-V)
|
Actual capacity (A.h/kg)
|
Efficiency (%)
|
|
1.50-1.55
|
1.45-1.50
|
1,230 min
|
55 min
|
General Specifications
|
A/mm
|
B/mm
|
kg/m
|
Dia. of the
steel core (mm)
|
|
14.0
|
2.0
|
0.28
|
|
|
16.0
|
2.0
|
0.37
|
|
|
19.1
|
3.4
|
0.55
|
3.2
|
|
21.3
|
3.4
|
0.68
|
|
|
26.7
|
3.4
|
1.00
|
|
|
33.4
|
3.4
|
1.60
|
|
|
39.6
|
4.8
|
2.23
|
|
|
51.4
|
4.8
|
3.72
|
|
The diamond of steel core could be available according to customers’ request. And we also could supply special product in accordance with the drawing from customers.
Prepackaged Mg Anodes
Above bare Mg anodes could be supplied after being prepackaged. The bare Mg anodes will be assembled with cable and sealed with epoxy resin, and packaged in cotton bag.
As the prepackaged anodes are buried under the ground, if there is any harmful element in the backfill of prepackaged anodes, this element will leak to the earth and groundwater when the anode is used, which will pollute the environment.
CORRTECH prepackaged anodes are made of recyclable materials or easily decomposable materials and the content of harmful elements in the backfill is lower than safety standards, which will not bring any pollution to the surrounding.
The available cables type (insulation / sheath) are: PVC/PVC, XLPE/PVC, HMWPE with cable size: 6mmsq, 10mmsq, 16mmsq.
Composition of Backfill
Ø Gypsum: 75%
Ø Anhydrous Sodium Sulphate: 5%
Harmful elements in backfill:
|
Hg (max)
|
Pb (max)
|
||
|
1ppm
|
1ppm
|
1ppm
|
10ppm
|
