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Chemically properties

 

 

Ceramic materials offer something special in their chemical reactivity :

  • Chemical inert
  • resistant to corrosion
  • catalystically effective
  • biologically compatable
Corrosion-resistant ceramic materials in comparison
  Oxide Carbide Nitride Silicate
AI2O3 ZrO2 SSC SISC SSN HPSN Earthen-
ware		 Hard-paste
porcelain		 Steatite
Hydrochloric acid
HCl (diluted)		 +
(*)		 - + +
(100°C)		 +
(*)		   +
(*)		 +
(*)		 +
(*)
Hydrochloric acid
HCl (concentrated)		 +
(*)		 0 +
(*)		 + - + +
(*)		 +
(*)		 +
(*)
Nitric acid
HNO2 (diluted)		 +   +
(*)		 +
(*)		 +
(*)		 + +
(*)		 +
(*)		 +
(*)
Nitric acid
HNO2 (concentrated)		 +
(*)		 0 +
(*)		 +
(*)		     + + +
Sulphuric acid
H2SO3(diluted)		 +     +
(100°C)		 +   +
(*)		 +
(*)		 +
(*)
Sulphuric acid
H2SO3(concentrated)		 +
(*)		 -
(*)		         +
(*)		 +
(*)		 +
(*)
Phosphoric acid
H3PO4		 +
(20 °C)		 0
(*)		 -
(250°C)		   0 + 80 %
H3PO4
+
(*)		 80 %
H3PO4
+
(*)		 80 %
H3PO4
+
(*)
hydrofluoric acid
HF		 - -
(20 °C)		 +   - - - - -
Caustic soda
NaOH-solution		 0
(*)		   + 0
(100°C)		 + + -
(*)		 -
(*)		 -
(*)
Caustic potash
KOH-solution		 +
(*)		 +
(*)		 +
(*)		 0
(80°C)		 +
(*)		 +      
Natrium chloride
NaCl		 +
(*)		     +
(900°C
in der Luft)		     +
(*)		 +
(*)		 +
(*)
Calium chloride
KCl		 +     +
(900°C
in der Luft)		     +    
Copper chloride
CuCl2		 (*)           + + +
Iron chloride
FeCl3		                  
+ resistant (up to given temperature) (*) boiling
- corrosion attack (at given temperature) o a reaction takes place

 

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10. Mai 2005

info@keramverband.de
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