The Corrosion Resistance of Tantalum
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The Corrosion Resistance of Tantalum

Tantalum is a refractory metal with a melting point of 5425°F (2996°C). It is a tough, ductile metal, which can be formed into almost any shape. It is used in corrosion resistant applications in environments no other metal can withstand. The major limitation of tantalum is its reactivity with oxygen and nitrogen in the air at temperatures above 300°C.
 
Tantalum is the most corrosion resistant metal in common use today. The presence of a naturally occurring oxide film on the surface of tantalum is the reason for tantalum's extreme corrosion resistant properties in aggresive media. The corrosion resistance in hydrochloric acid and resistance in sulfuric acid are second to none. It is inert to practically all organic and inorganic compounds. Tantalum's corrosion resistance is very similar to glass as both are unsuitable for use in hydrofluoric acid and strong hot alkali applications.

For this reason tantalum is often used with glass lined steel reactors as patches, dip tubes, piping and overhead condensers. Tantalum is inert to sulfuric and hydrochloric acid in all concentrations below 300°F. The corrosion attack on tantalum up to 400°F is not significant and is in common use up to 500°F.

Tantalum is not corroded by nitric acid in concentrations up to 98% and temperatures up to at least 212°F. Tantalum has proven itself to be totally inert in many corrosion applications. Some heat exchanger installations have been in continuous use for over 40 years in multi-product research environments without so much as a gasket change due to corrosion.
 
By the Tantaline Surface Alloy Technology it is posible to apply corrosion resitant surface layers of pure tantalum on top lower performance substartes like e.g. stainless steel.

Tantalum corrosion resistance in hydrochloric acid. Tantalum protection against corrosive attack in HCL.
Corrosion of Tantalum in Hydrochloric Acid
 
Corrosion resistance of tantalum in sulphuric acid (sulfuric) H2S04. Tantalum sulphuric acid protection from corrosive attack.
Corroion of Tantalum in Sulfuric Acid

 
Customer Testimonial - Performance (2:24)
Click to view General Atomics experience with Tantaline
 
Audio Presentation available: "The Corrosion Performance of Special Metals"
See the corrosion rates of Titanium, Hastelloys, Zirconium and Tantaline in Hot Acids. (1:55)
 
Corrosion Data on Metals in Hydrochloric Acid
Corrosion data in Hydrochloric acid. Choose ISO corrosion curves or the corrosion rates shown in tables at different temperatures and concentration.

Compare the corrosion data of Titanium, Nickel alloys (Hastelloy), Zirconium, Niobium and Tantalum in Hydrochloric Acid at various concentration and temperatures. Plese choose the format below

> As ISO corrosion CURVES
> As TABLES

 

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