Tantalum for Extreme Corrosion Environments
Tantalum is a rare, extremely corrosion-resistant refractory metal widely used in the chemical, semiconductor, and aerospace industries.
With its unmatched resistance to strong acids—including nitric, sulfuric, hydrochloric, and hydrofluoric acids—tantalum remains stable where most metals rapidly deteriorate.
Its unique combination of corrosion resistance, thermal stability, and biocompatibility makes it indispensable for high-purity and high-reliability systems.
Key Material Properties of Tantalum
Tantalum combines exceptional corrosion resistance, high-temperature strength, thermal stability, and biocompatibility—making it a critical material for demanding chemical, semiconductor, medical, and high-purity industrial applications.
High Corrosion Resistance
Stable in aggressive chemical environments, including hot and concentrated acids.
- Formation of a stable Ta₂O₅ oxide layer
- Resistance to strong mineral acids
- Applicable to reactors and chemical processing systems
High Strength-to-Weight Ratio
Maintains structural stability while allowing forming and machining.
- Supports forming, machining, and welding
- Maintains properties under mechanical load
- Used in pressure vessels and precision components
Heat & Oxidation Resistance
Stable under high-temperature and oxidizing conditions.
- Melting point around 3,017°C
- Oxide layer reduces deformation at high temperature
- Applicable to vacuum and high-temperature systems
Biocompatibility
Chemically inert in biological and high-purity environments.
- No ion release in bodily fluids
- Supports tissue integration
- Used in medical and semiconductor systems
Where Tantalum Is Used
for Highly Concentrated Acids
Heat transfer in high-temperature,
highly concentrated acid environments.
& Column Linings
Internal linings for long-term corrosion resistance
in aggressive chemical processes.
& Distillation Systems
Equipment for corrosive vapors
and repeated thermal cycling.
Handling Equipment
Materials for contamination-sensitive
chemical processes.
Common Industrial Tantalum Grades
| Category | Grade | Feature | Typical Applications |
|---|---|---|---|
| Pure Tantalum | Ta (R05200) |
Corrosion resistance in strong acids High ductility Stable oxide layer (Ta₂O₅) |
Chemical reactors Acid process equipment Heat exchangers (HCl / H₂SO₄) |
| Ta (R05400 High Purity) |
High purity (low impurities) Stable in ultra-clean environments Low contamination risk |
Semiconductor wet benches Etching equipment Diffusion components |
|
| Tantalum-Niobium Alloy | Ta-2.5Nb (R05252) |
Improved strength vs pure Ta Maintained corrosion resistance Good formability |
Heat exchangers Piping systems Chemical tubing |
| Ta-10Nb (R05255) |
Higher strength Improved thermal stability Corrosion resistance in acid systems |
Pressure vessels Acid recycle systems Structural components |
|
| Tantalum-Tungsten Alloy (Ta-W) | Ta-W2.5 |
Enhanced mechanical strength Thermal stability High-temperature capability |
Furnace components High-temperature structures |
| Ta-W10 |
High-temperature strength Creep resistance Structural stability under heat |
Heat shields High-temperature assemblies |
|
| Refractory / High-Temperature Grades | EB-Refined Ta (Electron-Beam Melted) |
Ultra-high purity Low inclusion content Stable microstructure |
Semiconductor equipment Medical-grade components |
| Specialty Grades | Tantalum Sheet/Plate (ASTM B708) |
Formability Weldability Corrosion resistance |
Lining Cladding Plant retrofit |
| Tantalum Tube/Rod (ASTM B365) |
Precision forming capability Corrosion resistance Dimensional stability |
Acid pipelines Medical components Heater elements |
Representative Corrosion Rates
| Environment | Tantalum (Ta) | Ti Gr.2 | SUS316L | Notes |
|---|---|---|---|---|
| Seawater (25°C) | < 0.00001 | < 0.0001 | 0.02-0.05 |
Stable passive oxide film Negligible corrosion rate |
| Chloride Solution | < 0.0001 | < 0.0001 | 0.1-0.3 |
No pitting behavior SUS susceptible to localized attack |
| Oxidizing Acid (HNO₃ 20%) | < 0.0001 | < 0.0001 | 0.05-0.2 |
Stable under oxidizing conditions Maintains corrosion resistance at elevated temperature |
| Reducing Acid (H₂SO₄ 10%) | < 0.005 | 0.0005 | 1-3 |
Stable at higher acid concentrations Ti performance decreases with concentration |
| Brine | < 0.0001 | < 0.0001 | 0.1-0.3 |
Chloride-resistant behavior No localized corrosion observed |
| Wet Chlorine Gas | Stable | Stable | Rapid Attack |
Stable in chlorine environments SUS experiences rapid degradation |
| Hydrochloric Acid (HCl) | Stable | Increased (Caution) | Severe Attack |
Stable even in hot HCl Ti requires condition-dependent evaluation |
Physical Properties (Reference: Tantalum R05200 / Grade 1)
Tantalum is applied in environments requiring high corrosion resistance and thermal stability.
The following table presents representative physical properties for material selection and design.
| Property | Value (Tantalum) | Description |
|---|---|---|
| Density | 16.6 g/cm³ | Higher than steel and titanium, requiring consideration in structural load and handling. |
| Melting Point | 2,996°C | Suitable for high-temperature service where thermal stability is required. |
| Tensile Strength | ~285 MPa | Ductile at room temperature, with strength increasing after cold working. |
| Yield Strength | ~185 MPa | Moderate at room temperature and retained under elevated-temperature conditions. |
| Elongation | 20–30%+ | Supports forming and thin-gauge fabrication where ductility is required. |
| Thermal Conductivity | 57.4 W/m·K | Applicable to equipment requiring both heat transfer and corrosion resistance. |
| Modulus of Elasticity | 186 GPa | Provides stiffness comparable to carbon steel in structural design. |
Meterials Supplied by ATX
Primary Metal Materials
Pipes & Tubes
Accessories & Components
Wire Products
Wire Rod · Welding Wire · Mesh Wire
Piping Components
Pipe Fittings (Elbow · Tee) · Flanges
Specialty Metal Scrap & Recycling
Exceptional Corrosion Resistance
ATX provides a one-stop solution from material supply to customized fabrication, backed by over 35 years of manufacturing and processing experience in titanium and specialty non-ferrous metals.