Tantaline® is a special surface treatment, through which stainless steel parts are given the extensive corrosion resistant properties of tantalum. Special rare metals such as nickel alloys, titanium, zirconium, niobium and even tantalum can be replaced by Tantaline®.


Tantaline® treatment is a diffusion bonded protective layer of tantalum, formed by chemical vapor deposition (CVD) on the surface of common materials. The proprietary process creates a dense tantalum surface with all the beneficial properties of pure tantalum. The Tantaline® process is conducted in a sealed reaction chamber under highly controlled conditions. The resulting surface has the same properties as pure tantalum. Due to its very dense surface oxide layer, tantalum is the most corrosion resistant metal commercially available. It has been well established in industrial applications, under high temperature acidic environments. 


Der eigene Prozess erzeugt eine extrem dichte Oberfläche aus Tantal mit allen vorteilhaften Eigenschaften von reinem Tantal. Das Tantaline® Verfahren wird in einer geschlossenen Reaktionskammer unter sehr kontrollierten Bedingungen durchgeführt.


If you are interested in our products, please have a look in our (printable) brochure.



Typical parts treated by Tantaline® are valves, fittings, autoclaves, process chambers, flow reactors, bellows, fasteners, flowmeters,

mixers, custom parts, medical devices and many other items.


Please contact us with your special request.



Characteristics of Tantaline® Surface Alloy


•Diffusion bonded and inseparable to the base part

•Thickness of tantalum layer is 50 μm

•Treatment of large and small parts

•100% dense layer

•Geometry independent



Tantaline® has a hardness similar to SuS 316

•Brinell @3000kg: 193 - 2 40

•Measured 200 - 250 Vickers

•Rockwell C: 11 - 23

•Rockwell B : 92 - 100

•Rockwell A: 56 - 62 


Properties of Tantaline® treated components


Tantaline ® has a unique combination of mechanical properties and characteristics, that allow treated components to service extremely severe environments. Tantaline ® treated components are rugged, durable, ductile and of course corrosion resistant.

The secret to the Tantaline ® solution is its long service life, rapid turn-around and cost-effective pricing. 


Thermal Shock Resistance

After every Tantaline ® treatment, the following test is executed:

•Samples are water quenched from 300°C

•48h corrosion test 32% HCl at 75°C after 10–30–60–100 cycles


Result after 100 cycles:

•No cracks, delamination or other defects observed

•No corrosion observed




Request test coupon

The ring on the left side is a 316 stainless steel washer that has been treated in the Tantaline® process .

We offer this test coupon to test in your corrosive



Please contact us for further information.


Dimensions of washer: D30mm x 2,5mm


Application notes

Using the link on the right you can view our application notes. In these notes the properties of Tantaline® are explained with components that are often provided by the Tantaline® treatment.

Corrosion table

Corrosion table

Tantaline is resistant against corrosion with the following media up to 150 degrees Celsius, unless stated otherwise.


Acetic acid

Ethyl sulfate

Phosphorus, <700°C (1290°F)

Acetic anhydride

Ferric chloride

Phosphorus chlorides


Ferric sulfate

Phosphorus oxychloride

Air, <300°C (570°F)

Ferrous sulfate

Pickling acids, except HNO3-HF



Potassium bromide

Aluminum chloride

Formic acid

Potassium chloride

Aluminum nitrate


Potassium dichromate

Aluminum sulfate

Hydroiodic acid

Potassium ferricyanide


Hydrobromic acid

Potassium iodine-iodine

Ammonium bicarbonate


Potassium nitrate

Ammonium carbonate

Hydrochloric acid

Potassium permanganate

Ammonium chloride

Hydrogen bromide, <400°C

Potassium sulfate

Ammonium nitrate

Hydrogen chloride, <350°C

Propionic acid

Ammonium phosphate

Hydrogen iodide

Silver nitrate

Ammonium sulfate

Hydrogen peroxide

Sodium acetate

Amyl acetate or chloride

Hydrogen sulfide

Sodium aluminate

Aniline hydrochloride

Hydroxyacetic acid

Sodium bisulfate, solution

Barium carbonate

Hypochlorus acid

Sodium bromide

Barium chloride

Iodine, <300°C (570°F)

Sodium chlorate

Barium hydroxide


Sodium chloride

Barium nitrate

Lactic acid

Sodium citrate

Benzoic acid

Magnesium chloride

Sodium cyanide

Boric acid

Magnesium hydroxide

Sodium dichromate

Bromine, dry, <300°C (570°F)

Magnesium sulfate

Sodium hypochlorite

Bromine, wet

Manganous chloride

Sodium nitrate

Butyric acid

Methyl alcohol

Sodium nitrite

Calcium bicarbonate

Methylsulfuric acid

Sodium phosphate

Calcium bisulfates

Mineral oils

Sodium silicate

Calcium bisulfites

Mixed acids (sulfuric-nitric)

Sodium sulfate

Calcium carbonate

Motor fuels

Sodium sulfide

Calcium chloride

Nickel salts

Sodium sulfite

Calcium hydroxide

Nitric acid

Sodium thiosulfate

Calcium hypochlorite

Nitric acid, fuming

Stearic acid

Carbolic acid

Nitric oxides

Succinic acid

Carbon dioxide

Nitrogen, <300°C (570°F)

Sulfamic acid

Chloric acid

Nitrous acid

Sulfur, <500°C (930°F)

Chlorinated brine

Nitrosyl chloride

Sulfur chlorides

Chlorine, dry, <250°C (480°F)

Organic chlorides

Sulfur dioxide

Chlorine, wet, <350°C (662°F)

Organic acids

Sulfuric acid, to 175°C (350°F)

Chlorine oxides

Organic esters

Sulfurous acid

Chloroacetic acid

Organic salts

Sulfuryl chloride

Chromic acid

Oxalic acid

Tannic acid

Citric acid

Oxygen, <300°C (570°F)

Tartaric acid

Copper salts

Pechloric acid

Thoinyl chloride

Dichloroacetic acid

Petroleum products

Tin salts



Zinc chloride

Ethylene dibromide

Phosphoric acid, <4ppmp, <180°C

Zinc sulphate



 Limited corrosion resistance


Tantaline offers limited corrosion resistance with the following media.

Air, >300°C (570°F)

Oleum (fuming sulfuric acid)

Sodium carbonate


Potassium carbonate

Sodium hydroxide, dilute

Ammonium hydroxide

Potassium hydroxide, dilute

Sodium hydroxide, conc.

Fluoride salt

Potassium hydroxide, conc.

Sodium pyrosulfate, molten

Hydrofluoric acid

Potassium pyrosulfate, molten

Sulfur trioxide

Hydrogen, <300°C (570°F)

Sodium bisulfate, molten

Sulfuric acid, >175°C (350°F)

Hydrogen fluoride