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magnesium anodes
- Sep 11, 2017 -

In cathodic protection, the most widely used sacrificial anodes are magnesium anodes. Magnesium anodes are designed for the cathodic protection of steel under fresh, brackish, and seawater conditions.

Magnesium anodes are also used extensively for underground structures and pipelines. Anodes can be supplied with cable connections welded to meet the customer’s requirements. For underground applications, anodes are packed in cotton bags with a gypsum / bentonite / sodium backfill to ensure immediate effect on installation and a constant environment through the anode’s working life.

Magnesium anodes are available in two standard alloys as follows:

 Standard Alloy (AZ63): -1.55V w.r.t. copper- for use in average soil resistivity conditions.
 High Potential Alloy: -1.75V w.r.t. copper- for use in high soil resistivity conditions.

Standard Composition


Mg

Al

Zn

Mn

Si
  (max)

Cu
  (max)

Ni
  (max)

Fe
  (max)

Other   Imp. 
  (max)

Each

Total

High Potential

Bal.

0.01 max

-

0.50-1.30

0.05

0.02

0.001

0.03

0.05

0.30


Bal.

5.30-6.70

2.50-3.50

0.15-0.70

0.10

0.02

0.002

0.003

--

0.30


Bal.

5.30-6.70

2.50-3.50

0.15-0.70

0.30

0.05

0.003

0.003

--

0.30


Bal.

5.0-7.0

2.0-4.0

0.15-0.70

0.30

0.10

0.003

0.003

--

0.30

Electrochemical Properties


Open-Circuit Voltage
 
(-V   respect to Cu/CuS04)

Closed-Circuit Voltage
  (-V respect to Cu/CuS04)

Actual Capacity
  (Ah/lb)

Current Efficiency
 
(%)

High Potential

1.77~1.82

0.01 max

1.64~1.69

0.50-1.30


Bal.

5.30-6.70

2.50-3.50

0.15-0.70


Bal.

5.30-6.70

2.50-3.50

0.15-0.70

 


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