Magnesium Anode
Saturday, 09 February 2019 00:00
Magnesium Anode
BORNA Godaz magnesium anodes have been specifically developed for cathodic protection of steel structures under fresh, brackish and sea water. They are manufactured in a comprehensive range of alloys, shapes and size to provide a wide selection for cathodic protection of buried under ground structures and pipelines, submerged and marine structures, vessels, storage tanks, internal protection of water tanks, etc.
Anodes for buried pipelines, tanks and similar structures are normally supplied packaged in a cotton bag containing a rapid wetting, moisture retaining backfill which reduces the electrolyte resistivity adjacent to the anode and improves performance.
Our magnesium anodes are available in two different magnesium alloy chemical compositions:
• Standard Potential -SP
• High Potential .HP
Typical Applications
|
Temporary
• Temporary protection of pipelines • Temporary protection of tank •Bottoms
• Anodes are installed during the • Construction period and prioi to • Energizing the permanent impressed • current system |
Permanent
• permanent protection of well • coated pipelines in low resistivity soils • permanent protection of buried • vessels and tanks • Internal protection of water tanks • Permanent protection of marine • Structures • "Hot Spot" locations |
| Magnesium chemical composition | ||
| Element | Standard | High Potential |
| Aluminum (%) | 5.3 - 6.7 | 0.05 max |
| Zinc (%) | 2.5 - 3.5 | 0.03 max |
| Manganese (%) | 0.2 - 0.5 | 0.5 - 1.0 |
| Copper (%) | 0.02 max | 0.02 max |
| Nickel (%) | 0.001 max | 0.002 max |
| Iron (%) | 0.005 max | 0.03 max |
| All Others (%) | 0.01 max | 0.03 max |
| Magnesium (%) | Remainder | Remainder |
Standards:
NACE-DNV
ASTM -IPS
| Eletrical Properties | Standard | High Potential |
| Electrochemical capacity (Ah/Kg) | 1230 | 1230 |
| Closed circuit potential (V) | -1.55 | -1.75 |
| (Respect to Ag/Agcl reference electrode) | ||
| Efficiency (%) | 58 | 49 |
The most widely specification for magnesium anodes is ASTM B275,ASTM G97.IPS-M-TP750/2, BS 7361, ASTM A283 grade C.
Standard Backfill Composition:
| GYPSUM (CaSO4)% | Bentonite Clay % | Sodium Sulfate% | Approx. Resistivity in Ohm-cm |
||
| Hydrated | Molding Plaster(Plaster of Paris) | ||||
| (A) 25 | --- | 75 | --- | 250 | |
| (B) 50 | --- | 50 | --- | 250 | |
| (C) --- | 50 | 50 | --- | 250 | |
| (D) 75 | --- | 20 | 5 | 50 | |
BORNA Godaz magnesium anodes are also used for protection of offshore structures quay walls and for marine applications in ballast tanks and external ships hulls and rudder and heat exchangers protection.
BORNA Godazmagnesium anodes can be made in various shapes &size to suit individual applications. They normally have steel-bar, rod core or wire for attachment to the structure by welding, cad-welding or either bolts & clamps.
The following documents show typical datasheets of Magnesium anode made in BORNA Godaz company. Also, Other informations such as ITP, QCP, chemical and electrochemical reports and certificates have shown here.
Datasheet Sample of BornaGodaz Single Hole Magnesium Anode (Standard Alloy 0.5 Kg)
Datasheet Sample of BornaGodaz Magnesium Anode (High Potential Alloy 17 lb - Trapezoidal Section)
Datasheet Sample of BornaGodaz Magnesium Anode (High Potential Alloy 32 lb - Trapezoidal Section)
Datasheet Sample of BornaGodaz Rod Shape Magnesium Anode (High Potential Alloy) , for cathodic protection of Heat Exchangers & Condensers
Chemical Analysis Report of BornaGodaz Magnesium Anode (Standard Alloy Grade AZ63B)
Electrochemical Test Report of BornaGodaz Magnesium Anode (Standard Alloy Grade AZ63B)
Chemical Analysis Report of BornaGodaz Magnesium Anode (High Potential Alloy)
Electrochemical Test Report of BornaGodaz Magnesium Anode (High Potential Alloy)
BornaGodaz Magensim Anode Catalogue - Persian Version
BornaGodaz Magnesium Anode Catalogue - English Version
