Tantaline® Treated Fasteners


Tantaline® is a unique Tantalum treatment solution that can extend the life of fasteners in a wide range of aggressive chemical environments. Stress Corrosion Cracking (SCC) of fasteners is a common problem that occurs when both tensile stress and corrosion act simultaneously. Tantaline® treatment can prevent failures due to SCC by eliminating corrosion.Tantalum is recognized as the most corrosion resistant metal available for industrial use. Tantalum coatings applied by the proprietary Tantaline® treatment process provides superior corrosion resistance for extended service of a wide range of fasteners.


The Chemical Vapor Deposition (CVD) process used by Tantaline® produces a uniform diffusion bonded tantalum layer that conforms to complex geometries such as threads. Tantaline® treated fasteners offer superior high temperature corrosion resistance compared to Hastelloy®*, Inconel®**, and Stainless Steel. It provides protection against all forms of corrosion including SCC, corrosion fatigue, and crevice corrosion in the presence of hot acids, thereby reducing failures. An additional benefit is that ease of disassembly reduces maintenance time and costs. The metallurgical properties of the tantalum surface combined with the uniform and conformal CVD layer results in a robust product that can be offered with economical pricing and short lead-times.


A wide range of styles and configurations are suitable for Tantaline® treatment.

Fastener Type:
  • Bolts
  • Studs
  • Cap Screws
  • Machine Screws
  • Threaded rods
Thread type:
  • Unified national coarse
  • Unified national fine
  • ISO metric
  • Special orders


Chemical Processing Hot acids, wet and dry chlorine, sulfur compounds, sour gases containing hydrogen sulfide (H2S) compounds
  • Valve assemblies
  • Pipe flange connections
  • Pump body assemblies
  • Equipment mounts
  • Pressure vessel closures
  • Process Equipment
  • Storage tank mounting
  • Drilling Equipment
  • Engine components
  • Heat exchangers
  • Motor equipment
Oil & Gas Acid gases (CO2, H2S, SO2), ammonia (NH3), hydrogen cyanide (HCN), alkylation, and amine derivatives
Pharmaceutical Oxidizing agents including hydrogen peroxide (H2O2), bromine (Br), chlorine (Cl), nitration, and various cleaning chemistries
Semiconductor Strong HCl etchants, corrosive Nital (alcohol + nitric acid), byproducts of Silicon deposition process
Mining High Pressure Acid Leach (HPAL), Partial Oxidation (POX), Extraction
Marine Corrosive sea water with chlorides, dissolved oxygen (O2), microbial corrosion

Key Technical Information

Hastelloy®* or Stainless Steel fasteners are susceptible to SCC and pitting especially in hot acids like HCl. Tantaline® treatment offers the following beneficial characteristics:

  • Chemically resistant to SCC and pitting in many aggressive media and environments.
  • Tantalum layer remains passivated and inert to corrosion under high temperature (>200⁰ C) acidic conditions including concentrated hydrochloric acid (HCl) and
    sulfuric acid (H2SO4).***
  • Superior corrosion resistance against wet, dry chlorine atmospheres, and other chlorinated environments.
Tantalum HCI Corrosion Resistance
*Hastelloy® is a registered trademark of Haynes International.
**Inconel® is a trademark of Special Metals Wiggin Limited.
***FJ, H. (n.d.). Properties of Tantalum for Applications in the Chemical Process Industry