Prepacked Magnesium Anodes

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Description:

Magnesium Anodes are a type of Sacrificial Anode. They are mainly used when high driving potential is desirable, e.g. soils, fresh water, and brackish water. The corrosion products produced by magnesium alloys are non-toxic and therefore suitable for use in potable water.

Prepacked Anode packed in cotton bag and filled with backfill , and bare anode connected with cable and the joints are sealed with epoxy resin.

Advantage:
Magnesium anode is casted from high-purity magnesium and installed in a backfill of 75 % gypsum, 20 % Bentonite and 5 % sodium sulfate.
This type of anode produces an open circuit potential of 1.65 - 1.70 volts, which is 20 - 30 % greater than conventional magnesium anodes. This high driving voltage means greater protection can be delivered from fewer anodes

Application

Prepacked Magnesium anode are used for pipelines, tanks and buried vessels cathodic protection, it can maintain moisture around the anode and lowers the anode to earth resistance.Anodes used in low resistivity soils may be supplied

Chemical Compositions of Cast Magnesium Anodes:

Element		Anode type
Element		High Potential	AZ63B(HIA)	AZ63C(HIB)	AZ63D(HIC)	AZ31
Mg		Bal	Bal	Bal	Bal	Bal
Al		<0.01	5.30-6.70	5.30-6.70	5.0-7.0	2.70-3.50
Zn		-	2.50-3.50	2.50-3.50	2.0-4.0	0.70-1.70
Mn		0.50-1.30	0.15-0.70	0.15-0.70	0.15-0.70	0.15-0.60
Si(max)		0.05	0.10	0.30	0.30	0.05
Cu(max)		0.02	0.02	0.05	0.10	0.01
Ni(max)		0.001	0.002	0.003	0.003	0.003
Fe(max)		0.03	0.005	0.005	0.005	0.005
Other Imp.(max)	Each	0.05	-	-	-	-
Other Imp.(max)	Total	0.30	0.30	0.30	0.30	0.30

Electrochemical Properties

TYPE ITEM	Open Voltage (-V,SCE)	Close Voltage (-V,SCE)	Actual Capacity (A.h/LB)	Efficiency %
High Potential	1.70-1.78	1.50-1.60	>500	>50
AZ63	1.50-1.55	1.45-1.50	>550	>55
AZ31	1.50-1.55	1.45-1.50	>550	>55

Backfill Composition:

Element	Powdered Hydrated Gypsum	Granular Bentonite	Anhydrous Sodium Sulphate
Normal (%)	75	20	5

Cable:

10mm² XLPE/PVC tail cable, or as customer requirements