Take advantage of cathodic protection materials to build a wonderful tomorrow
Cathodic Protection technology is the technology to stop or prevent the protected metal structure from electrochemical corrosion. Reasonable cathodic protection can lengthen the service life of metal structure and ensure its safe operation.
Basic introduction
1   Sacrificial Anode System
2   Impressed Current System


Sacrificial Anode System

Zinc and magnesium anodes used in cathodic protection applications in soil are sometimes supplied prepackaged with a prepared backfill material in a cloth or cardboard container. The special backfill prevents direct soil contact to reduce localized corrosion of the anode, prevents passivation of the anode caused by reactions with soil salts, provides a low-resistivity environment around the anode, and expands when wet to fill the hole and eliminate air voids.

Chemical Composition:

Anode

Hydrated Gypsum

Bentonite Cla

Sodium Sulfate

Magnesium

75%

20%

5%

Zinc

50%

50%

- -


Impressed Current System

Carbon is used as a backfill material around impressed current anodes for underground CP applications. The purpose of the backfill material is to:

1 reduce the resistivity of the environment surrounding the anode to increase the amount of current the anode can discharge

2 extend the anode surface area, thus increasing the amount of current the anode can discharge

3 reduce consumption of the anode since the carbon becomes the part of the anode consumed before the anode itself.

Yuxi offers carbon backfill both at calcined petroleum or metallurgical coke, each being the product of its respective industry.

The typical composition of carbon backfill is:

Carbon

Ash

Moisture

Sulfur

Volatile Matter

Resistivity

Particle size

Calcined

≥98.5%

≤0.5%

≤0.5%

≤0.5%

≤0.5%

≤0.1Ω.cm

0.1-1.0mm

Metallurgical

≥86.0%

≤12.0%

≤5.0%

≤0.6%

≤1.8%

N/A

1-10mm