Magnesium Anode Performance

Product Description

Making high potential magnesium anodes can be a difficult proposition. Much like adding ingredients to a cake recipe, it is fairly simple to meet ASTM B 843 (Standard Specification for Magnesium Alloy Anodes for Cathodic Protection) requirements for anode composition. However, the difficult part in the process is the way the anode is made, which can greatly affect the ultimate performance of the anode.
Anode Performance
What is acceptable anode performance? Two factors, open circuit potential and current efficiency, are the industry standards by which anode performance is measured. These factors are confirmed by conducting laboratory tests in accordance to ASTM G97 (Laboratory Evaluation of Magnesium Anode Test Specimens for Underground Application) requirements. In this test, anode "pencils" or samples are taken from randomly selected anodes and are measured over a period of fourteen days. At the conclusion of the test, open circuit potential is measured and weight loss is utilized to determine current efficiency.
While there are no specific industry standards for open circuit potential and current efficiency, the "accepted" levels are typically:
. Open Circuit Potential: -1.70 volts with respect to a saturated Calomel electrode (-1.774 volts with respect to a Cu/CuSO4 electrode)
. Current Efficiency: 50% or 500 amp hours
What happens when an anode fails to meet the above levels? If an anode falls below -1.70 volts open circuit potential, there will be a corresponding decrease in output current produced by that anode. Simply put, the anode will produce less protective current. Conversely, as open circuit potential increases, additional output current will be obtained, assuming similar circuit resistance. Similarly, if anode current efficiency drops below the 50% target, the life of the anode will also decrease. If current efficiency increases, so too will anode life.

Chemical composition (%)

Alloy

Other metal impurity (max)

Total of impurities (max)

(max)

Mg-Mn

0.01

0.50-1.30

0.02

0.05

0.03

0.001

0.05

0.3

Electrochemical properties

Open voltage(-V)

Closed voltage(-V)

Actual capacity
(A. h/kg)

Efficiency (%)

1.70-1.75

1.58-1.62

1, 100 min

50 min

More Product Features


HS Code:	8104902000
Trademark:	CORRTECH
Standard:	ASTM B843
Productivity:	500000PC/Year
Origin:	China
Packing:	Wooden Carton
Classification:	Non-Ferrous Metal & Products
Export Markets:	North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe
Company:	Shandong Corrtech Cathodic Protection Technology Company