IrTa Coating Titanium Anode For Cathodic Protection

IrTa-coated titanium anodes are advanced mixed metal oxide (MMO) electrodes designed for impressed current cathodic protection (ICCP) systems. They are widely used to protect metallic structures in seawater, soil, and industrial environments from corrosion.

The coating consists of iridium oxide (IrO₂) and tantalum oxide (Ta₂O₅) applied onto a titanium substrate, forming a stable, highly active, and long-life electrocatalytic surface.

Working Principle

In cathodic protection systems:

The titanium MMO anode acts as the auxiliary anode

When DC current is applied:

• Electrons are supplied to the protected metal structure

• The structure becomes the cathode

• Corrosion reactions are suppressed

At the anode:

A slow, controlled electrochemical reaction occurs

The MMO coating provides catalytic activity for oxygen evolution

The titanium substrate remains structurally stable

This system effectively prevents corrosion of pipelines, tanks, and offshore structures.

Key Advantages

Excellent Corrosion Resistance
Ir-Ta coating is highly stable in seawater, soil, and chemical environments

Long Service Life
Low coating consumption rate ensures long-term operation

High Electrochemical Stability
Maintains performance under continuous current load

Low Consumption Rate
Typically very low coating loss (mg/A·year level)

High Current Efficiency
Suitable for large-scale ICCP systems

Dimensional Stability
Titanium substrate remains intact during operation

Technical Specifications

Reference Standards:
ASTM B265 / NACE TM0108

Base Material: Titanium Grade 1 or Grade 2 (ASTM B265 compliant)

Coating System: Iridium–Tantalum Mixed Metal Oxide (Ir-Ta MMO)

Available Forms: Tube / Plate / Mesh / Wire / Rod

Coating Structure: Thermal decomposition multi-layer coating

Performance Requirements

Accelerated Life Test: According to application conditions

Test Medium: Na₂SO₄ solution (1 mol/L)

Current Density: ~10,000 A/m²

Temperature: 25 ± 5°C

Quality Inspection Before Delivery

Each anode is strictly tested for:

Dimensional accuracy

Coating appearance inspection

Coating adhesion strength

Substrate chemical composition

Accelerated life testing

Electrical resistance verification

Application Areas

Offshore oil & gas platforms

Submarine pipelines

Underground pipeline networks

Storage tanks (internal & external protection)

Marine steel structures

Industrial buried steel systems

Application Case

In offshore oil and gas projects, Ir-Ta coated titanium anodes are installed on submerged steel structures such as platform legs. These anodes are connected to a DC power supply to provide continuous cathodic protection.

In seawater environments:

• Chloride concentration is high

• Corrosion rate is extremely aggressive

The Ir-Ta MMO coating ensures:

• Stable long-term operation

• Resistance to seawater corrosion

• Reduced maintenance costs

Field applications show that ICCP systems using Ir-Ta titanium anodes significantly extend structure service life and reduce repair frequency.

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