X
In order to reduce the grounding resistance of the anode and make the corrosion of the anode surface uniform, the magnesium anode and zinc anode used for cathodic protection in the soil generally use fillers. The typical filler composition is as follows:
Soil Resistivity | Product | Gypsum Powder | Bentonite | Sodium Sulfate |
＞ 20Ω•m | Magnesium alloy sacrificial anode | 75% | 20% | 5% |
Zinc alloy sacrificial anode | ||||
≤20Ω•m | Magnesium alloy sacrificial anode | 50% | 50% | -- |
Zinc alloy sacrificial anode | 50% | 45% | 5% |
Calcined petroleum coke is mainly used as a ground bed filler for impressed current anodes. It comes from petroleum refining and has a resistivity of generally less than 1Ω•cm.
Model Code | Carbon Content (%) | Moisture (%) | Volatile Matter (%) | Ash Content (%) | Bulk Density | Proportion | Particle Diameter | Resistivity Ω .cm |
CA-01 | ＞ 98.5 | ＜ 0.5 | ＜0.5 | ＜0.5 | 1180 kg/m3 | 2.0-2.3 | 0-1mm | ≤0.1 |
CA-02 | ＞98.5 | ＜0.5 | ＜0.5 | ＜0.5 | 1180 kg/m3 | 2.0-2.3 | 0-2mm | ≤0.1 |
