Zirconium 702 has excellent thermal conductivity, corrosion resistant, and is inert to all organic and inorganic substances. Its qualities make it the perfect substance for corrosion-resistant process equipment. Any piece of process equipment where corrosion is a concern should be given zirconium consideration due to its long-term advantages of decreased downtime, greater life expectancy, and profitability.
Zirconium is widely recognized for its resistance to pitting and crevice corrosion as well as its immunity to stress corrosion cracking. At ambient temperature, a protective oxide layer forms on this reactive metal because of its high affinity for oxygen.
Zirconium offers excellent corrosion resistance to:
It has poor resistance to oxidizing agents
Chemical Composition:
| Element | Percentage |
|---|---|
| Zirconium ( Zr ) | 95.5% |
| Hafnium ( Hf ) | 4.5% |
| Iron ( Fe ) + Chromium ( Cr ) | 0.2% |
| Nitrogen | 0.025% |
Corrosion Rating:
RATINGS - 0:Unsuitable 1:Poor to Fair 2:Fair 3:Fair to good 4:Good 5:Good to Excellent 6:Normally Excellent
| Materials | Non-oxidizing or reducing media | Liquids | Gases | |||||||
| Acid solutions excluding Hydrochloric, phosphoric, sulfuric | Neutral solutions, e.g. many Non-oxidizing salt solutions, chlorides, sulfates | Alkaline solutions | Oxidizing Media | Halogen & derivatives | ||||||
| Caustic & mild alkalis, excluding ammonium hydroxide | Ammonium hydroxide & amines | Acid solutions, e.g. nitric | Neutral or alkaline solutions e.g. per sulfates, peroxides, chromates | Pitting media, acid ferric chloride solutions | Halogen | Hydrogen halides, dry, e.g., dry, hydrogen chloride | ||||
| Moist, e.g. chlorine below dew point | Dry, e.g. fluorine above dew point | |||||||||
| Zirconium | 3 | 6 | 2 | 6 | 6 | 6 | 2 | 6 | 1 | 6 |
Note: Maximum Design Temperature: 316°C