An Introduction to Sacrificial Anodes
What are Anodes and how do they work?
Simply it is the use of a very pure metal to attract the destructive
electrolysis that causes rust, away from the metal surface and onto
itself.
Sacrificial anodes have been in common and constant use in a multitude
of applications for many years. They protect all ships at sea,
underground and above ground pipelines, boilers, water heaters and
generally steel structures immersed in water or damp soil conditions
where corrosion could be expected to be a problem.
The corrosion (rust) is the result of electrolytic action travelling
through moisture or fluid to home in on the metal surface at risk.
Depending upon the existing conditions such as amount and quality of the
fluid (water?) and the effective presence of any other protective
coating on the metal surface, the rate of corrosion can vary
substantially.
For this application the anodes are of a particular grade of magnesium
which is “electro-negative relative to steel” which means that they will
attract the destructive electrolytic action on to themselves. This type
of galvanic protection is called sacrificial and the principle of
electrolytic corrosion control is called cathodic protection. Because
cathodic surfaces cannot
rust, the steel surface is protected while an active
anode is in place.
“MetalGuard”
Bagged Sacrificial Anodes
Model EBA265M2 Bagged Anode

for any
metal structures and External tank Protection
FOR: Tanks,
Bores, bore heads, casings and external protection
of all types of metal structures above
and below ground level.
SPECIFICATIONS
“MetalGuard” BAGGED ANODES
Instructions:
Detailed assembly and installation instructions are provided with each
kit.
“M2” Standard Potential Extruded magnesium anodes
Oxidation Potential: |
1.4 - 1.5 volts (with respect to a copper-copper sulphate
reference anode) |
Current Capacity: |
1102 – 1212 ampere hours per kg in the ASTM Standard G97 test. |
Anode Consumption: |
Aluminium: 2.5 -3.5 Manganese:
0.20 – 1.0 |
|
Zinc: 0.7 - 1.3 max
Ca: 0.04 max |
|
Si: 0.05 max
Copper: 0.01 max |
|
Nickel: 0.001 max
Iron: 0.002 max |
|
Total other impurities: 0.30 max |
|
Other Impurities Each: 0.001 Magnesium:
Balance |
Core: |
Steel Core running lengthwise through its centre |
GENERAL
Anode Life:
The life of the anode will vary through differing factors such as soil
type, soil moisture, water quality and the quality of the surface being
protected.
Replacement:
It is recommended that your anode be inspected and replaced when more
than 50% of its central wire core is exposed through corrosion. Bagged anodes are normally replaced after
approx 10 years.
Application:
“MetalGuard” Bagged anodes
are recommended for use with any in ground metal structure, in new and
existing tanks and
bore
applications.
Consumption of anodes through
corrosion means that they are doing their job correctly!
SAFETY
“MetalGuard”
bagged anodes conform to Australian Standard AS2239.
This
standard advises that the by-products of
magnesium anodes commonly used in “potable water applications” are non-toxic.
|
There
is an Anode-Tech
Sacrificial Anode
available for:
“Galvorod” ®
THE WORLD’S MOST
EFFICIENT ANODES |
To order or for further product details contact John at-
Anode-Tech
Advanced Technology
Mobile: 0408 866 925
Email: anodetech@bigpond.com
Anodes manufactured. Can custom make to order. Supply Australia
wide.
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