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TABLE 2 - CORROSION DATA of NIOBIUM in AQUEOUS MEDIA, CONT., P. 3
Solutions Concentration (Weight%) Temp. (°C) Corrosion Rate mm/y (mpy)*
Organic Acid
Acetic Acid 5-99.7 boiling nil
Acetic Acid 50% with 50% Acetic boiling 0.025 (1.0)
  Anhydride    
Acid Solutions       
Citric Acid 10 boiling 0.025 (1.0)
Formaldehyde 6 boiling nil
Formaldehyde 37 boiling 0.0025 (0.1)
Formic Acid 10 boiling nil
Formic Acid 50 boiling 0.025 (1.0)
Lactic Acid 10-85 boiling 0.025 (1.0)
Oxalic Acid 10 boiling 1.25 (50)
Tartaric Acid 20 RT-boiling nil
Trichloroacetic 50 boiling nil
Trichloroethylene 99 boiling nil
Alkaline      
NaOH 1-40 RT 0.125 (5.0)
NaOH 1-10 98 Embrittle
KOH 5-40 RT Embrittle
KOH 1-5 98 Embrittle
NH4OH   RT nil
Salts      
AICl3 25 boiling 0.005 (0.2)
Al2(S04)3 25 boiling nil
AIK(S04)2 10 boiling nil
CaCI2 70 boiling nil
CaCI2 .2% with .1% MgCI2 80 0.025 (1.0)
  +200 ppm NaF    
  +100 ppm CaF2    
CaCI2 .2% with .1% MgCI2 80 0.25 (10)
CaCI2 2% with 1% MgCI2 80 0.025 (1.0)
  + 200 ppm NaF    
  + 2800 CaF2    
CaCI2 2% with 1% MgCI2 80 0.125(5.0)
CaCI2 6.6% with 3.3% MgCI2 80 0.025 (1.0)
  + 200 ppm NaF      
  + 9800 ppm CaF2      
CaCI2 6.6% with 3.3% MgCI2 80 0.025 (1.0)
Cu(N03)2 40 boiling nil
CuSO4 40 104 0.025 (1.0)

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INDEX  •  CORROSION RESISTANCE PROPERTIES  •  FABRICATION   
NIOBIUM PRODUCTS   •  SPECIFICATIONS of NIOBIUM   
NIOBIUM ELECTRONICS APPLICATIONS