رهاورد ذوب ایرانیان
تولید کننده آندهای فداشونده
عنوان :
آند Backfill
دسته : آندهای منیزیم
Backfill :
1- Backfill mix (A) , is useful n low soil moisture areas and utilizes the moisturholding characteristic of the bentonite clay .
2- Backfill mix (B) , is usefil with magnesium or zinc in very wet marshy soils to prevent rapid migration of backfill from anode surface .
3- Backfill mix (C ) , with low resistivity , is useful in high oil resistivity reas to reduse the anode resistance to earth .
|
Backfill Composition |
|||
|
Materials |
Type |
Type |
Type |
|
Gypsum % |
25 |
50 |
75 |
|
Bentunite % |
75 |
50 |
20 |
|
Sodium suiphate |
-- |
-- |
5 |
|
Approx Resistivity in ohm-cm |
250 |
250 |
50 |
RahavardZob`s magnesium anodes usually are produced with two chemical composition types : Standard & High Protential (table 2) .
|
Elements |
Al |
Zn |
Mn |
Cu |
Ni |
Fe |
All others |
Mg |
|
Standard |
5.3 – 6.7 |
2.5 – 3.5 |
0.2 – 0.5 |
0.02 (max) |
0.001 (max) |
0.005 (max) |
0.01 (max) |
Balance |
|
High Protential |
0.01 (max) |
0.03 (max) |
0.9 – 1.2 |
0.02 (max) |
0.001 (max) |
0.3 (max) |
0.3 (max) |
Balance |
Please note that these are our standard chemical composition . Other can be cast to cutomer requirements.
The must used specifications for magnesium anodes are : ASTM B 275, ASTM G7 , IPS-M-TP-50/3 , BS7361 , ASTM A 283 grade C .
Electrical properties :
1- Open circuit potential negative volts (Cu/CuSO4 electrode ):
a)Standard : 1.6 V
b)High Potential : 1.75 V
2- Current efficiency (min) :
a) Standard :58 % V
b) High potential 50 % V
3-Conumption rate 9max ) :7.3 Kg/amp – year
4- Energy capability (min) :1200 amp – hr/Kg