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TABLE 2 - CORROSION DATA of NIOBIUM in AQUEOUS MEDIA, CONT., P. 2
Solutions Concentration (Weight%) Temp. (°C) Corrosion Rate mm/y (mpy)*
Acid Solutions      
Phosphoric Acid 85 boiling 3.75 (150)
Phosphoric Acid 85% with 4% HNO3 88 0.025 (1.0)
Phosphoric Acid 30% + 5 ppm F-1 boiling 0.25 (10)
Phosphoric Acid 40% + 5 ppm F-1 boiling 0.25 (10)
Phosphoric Acid 50% + 5 ppm F-1 boiling 0.5 (20)
Phosphoric Acid 68% with 3.5% HNO3 45 0.125 (5.0)
  and 5% acetic acid    
Sulfuric Acid 5-40 RT nil
Sulfuric Acid 25 100 0.125 (5.0)
Sulfuric Acid 98 RT Embrittle
Sulfuric Acid 10 boiling 0.125 (5.0)
Sulfuric Acid 25% + 200 ppm Cl-1 boiling 0.25 (10)
  +5ppm F-1    
Sulfuric Acid 40 boiling 0.5 (20)
Sulfuric Add 40% with 2% FeCI3 boiling 0.25 (10)
Sulfuric Acid 60 boiling 1.25 (50)
Sulfuric Acid 60% with 01-1% FeCI3 boiling 0.5 (20)
Sulfuric Acid 20% with 7% HCI boiling 0.5 (20)
  +50 ppm F-1    
Sulfuric Acid 20% with 7% HCI boiling 0.5 (20)
  +100 ppm F-1    
Sulfuric Acid 20% with 7% HCI and boiling 0.25 (10)
  1OO ppm F-      
Sulfuric Acid 50% with 20 HNO3 50-80 nil
Sulfuric Acid 50% with 20% HNO3 boiling 0.25 (10)
Sulfuric Acid 60 90 0.05 (2.0)
Sulfuric Acid 65 153 2.5 (100)
Sulfuric Acid 70% + 200 ppm CuCI2 158 >5.0 (200)
Sulfuric Acid 70% + 1000 ppm CuCI2 153 2.5 (100)
Sulfuric Acid 70% + 10000 ppm CuCI2 154 2.5 (100)
Sulfuric Acid 70 167 5.0 (200)
Sulfuric Acid 70% with 15% Cr+3 100 nil
Sulfuric Acid 70% with 15% Cr+3 125 0.125 (5.0)
Sulfuric Acid 70% with 15% Cr+3 boiling 3.75 (150)
Sulfuric Acid 72% + 3% CrO3 100 0.025 (1.0)
Sulfuric Acid 72% + 3% CrO3 125 0.125 (5.0)
Sulfuric Acid 72% + 3% Cr03 boiling 3.75 (150)

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