Published: Jan 2005
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A MAJOR FACTOR in determining the specific applications of tantalum for corrosion-resistant equipment is its price. The cost of tantalum metal is about 15 times that of nickel-copper, nickel, or titanium and about 50 to 100 times that of the stainless steels. Accordingly, the service requirements for tantalum components are to have practically no corrosion degradation over time periods of years-virtually indefinite life. This means that the use of tantalum is limited to a relatively small number of the most severe media and conditions in relatively thin cross sections or as lining compared to other materials of construction. Selection of tantalum for use is based on large, not moderate, improvements of performance over other materials. Therefore, testing data do not need to be highly quantified. If corrosion rates greater than 0.051 mm/yr. (2 mpy) are indicated the application very likely is not recommended .
CPI-Product Manager, H. C. Starck, Inc., Newton, MA
Senior Metallurgist, H. C. Starck, Inc., Newton, MA