High-Quality Titanium-based Lead Dioxide Anode from China Suppliers and Factory for Corrosive Environments
Key Features and Critical Performance
1. Structural Design
The titanium-based lead dioxide anode is not a simple coating, but rather a "sandwich" structure:
- Titanium matrix: Provides mechanical strength support.
- Intermediate bonding layer: Prevents titanium surface oxidation during electrolysis and formation of insulating TiO₂ passivation film. Pre-coated with tin-sulfide oxide, platinum group metal oxide, or tantalum.
- Surface active layer (PbO₂): The functional layer, divided into α-PbO₂ and β-PbO₂, optimized in combination.
2. Core Performance
- High catalytic & strong oxidation: Oxygen evolution potential (~1.75V) enables preferential organic degradation over oxygen release.
- Excellent corrosion resistance: Stable in oxidizing media like strong acids (sulfuric and nitric acid).
- Good conductivity & stability: Low electrode resistance, cell voltage 5%-8% lower than traditional anodes.
- Economy: Much lower material cost compared to platinum and precious metal anodes.
3. Main Limitations
- Passivation failure: Damaged intermediate layer leads to substrate oxidation and coating peeling.
- Potential lead leaching: Risk of trace lead ion leaching under extreme conditions, limiting high-purity applications.
- Complex preparation: Multi-layer preparation requires high standards and exhibits quality variations.
Product Display
Analysis of Main Application Domains
Treatment of refractory organic wastewater (the most widely used application)
Hydrometallurgy and Electrochemical Industry
- Non-ferrous metal electroplating: Electrolytic extraction of metals (zinc, copper, manganese) to reduce energy and improve purity.
- Electrochemical synthesis: Electrolytic synthesis of chlorates, hydrogen peroxide (H₂O₂), and organic compounds like 4-pyridinecarboxylic acid.
Other electrochemical processes
Used in electroplating, high-purity water production, and cathodic protection as alternative anodes for oxygen or chlorine evolution compared to traditional graphite or lead alloy anodes.
Summary and Usage Suggestions
How to choose and use
- Preferred scenarios: For complex, non-biodegradable organic wastewater or strongly acidic media electrolysis.
- Key evaluation indicators: Focus on accelerated life test data; verify specific intermediate layer materials (tin-selenium oxide, tantalum, etc.) and processes.
- Usage precautions: Avoid long-term strongly alkaline environments (PbO₂ dissolves). Ensure no fluoride ions in the electrolyte (corrodes titanium). Perform low-current polarization treatment first when reactivating.
Horizontal Comparison & Advancement
- vs. Stainless Steel/Nickel Anodes: Steel/nickel are used as cathodes or soluble anodes in alkaline/weakly corrosive environments. Titanium-based lead dioxide is insoluble for highly corrosive/oxidizing environments.
- vs. Other Titanium Anodes (e.g., Iridium-Tantalum DSA): DSA is superior for chlorine evolution (chlor-alkali industry) and has a longer lifespan, but titanium-based lead dioxide offers a greater cost advantage in high oxygen evolution potential and strong oxidizing organic wastewater treatment.
Advantages and Disadvantages
| Comparison of advantages and disadvantages of titanium based lead dioxide anode and lead anode | ||||
| No. | Technical Specification | Lead alloy anode | Titanium based lead dioxide anode | |
| 1 | The quality of copper | 99.8617% (Lead ions are easy to exceed the standard) | 99.9972% | |
| 2 | Load current density | 260A/Square | 400A/Square | |
| 3 | Anode mud | Clean trough the slot once a month | Without clear trough the slot | |
| 4 | manual operation | Heavy weight, easy to fracture conductive bean lifting | Light weight, no corrosion | |
| 5 | Sulfuric acid concentration | 180~250g/litre | <350g/litre | |
| 6 | operating temperature | <60℃ | <60℃ | |
| 7 | use life | 12~36 months | >36 months | |
| 8 | Whether can repair | beyond repair | Can be heavy plating | |
| 9 | chlorine ion content | <10ppm | <2000ppm | |
| 10 | Fluorine ion content | <1ppm | <500ppm | |
| 11 | current efficiency | 90%~95% | 88%~92% (About 3% lower than lead alloy) | |
| 12 | domestic price | 3400~3800 RMB/PC | 3600~4000 RMB/PC (15-20% more expensive than lead alloy) | |
| 13 | weight/pc | ~120kg/pc | 40~50kg/pc (Single person operation) | |
| A | 14 | structural style | Slab solid structure | Network structure, good liquid flow |
| 15 | corrosion | The liquid and gas phase interface is prone to corrosion | The interface does not corrode | |
| 16 | Board face level off | 3~6 months out of the slot, need manual recalibration | non-deformation | |
Frequently Asked Questions (FAQ)
What is the structural design of a titanium-based lead dioxide anode?
It features a multi-layer "sandwich" structure consisting of a titanium matrix for mechanical strength, a pre-coated intermediate bonding layer (such as tin-sulfide oxide or tantalum) to prevent oxidation, and a surface active layer of α-PbO₂ and β-PbO₂ for catalytic and electrochemical performance.
What are the main application domains for these anodes?
They are primarily used in the treatment of refractory organic wastewater, hydrometallurgy processes (like electroplating zinc, copper, and manganese), and electrochemical synthesis of products like chlorates and hydrogen peroxide.
What are the operational precautions when using titanium-based lead dioxide anodes?
Avoid using them in strongly alkaline environments, as PbO₂ will dissolve. Ensure the electrolyte is free of fluoride ions to prevent severe corrosion of the titanium substrate. Additionally, perform polarization at a low current when starting up new or long-inactive anodes.
How does a titanium-based lead dioxide anode compare to a traditional lead alloy anode?
Titanium-based lead dioxide anodes offer higher current densities (400A/㎡ vs 260A/㎡), longer service life (>36 months), lighter weight for easier handling, and do not generate anode mud, resulting in higher copper purity during electrolysis.
What are the limitations of titanium-based lead dioxide anodes?
The main limitations include potential degradation due to passivation if the intermediate layer is damaged, a risk of trace lead leaching under extreme conditions, and a highly complex multi-layer preparation process.
Can these anodes be repaired or replated after failure?
Yes. Unlike traditional lead alloy anodes which are beyond repair once damaged, titanium-based lead dioxide anodes can be stripped and heavy-plated again, extending the lifecycle of the titanium substrate.