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Performance of Beryllium Copper

(6) Corrosion Resistance

In general, copper and its alloys have good corrosion resistance. Among various copper alloys, beryllium copper has excellent corrosion resistance and a low sensitivity to stress corrosion which can be serious for brass and nickel silver. Also beryllium copper has a better corrosion resistance against seawater than aluminum bronze or copper nickel. Therefore, beryllium copper is an ideal material when corrosion resistance and mechanical strength are required at the same time. A dense oxide film is formed on the surface of beryllium copper by age hardening and acts as protective coating. Thus, beryllium copper also shows good resistance against discoloration at a high temperature. Fig. 8 shows the magnitude of corrosion by salt water spray in comparison with other copper alloys. Phosphor bronze and copper titanium corrosion will advance at a much more rapid pace.

Fig. 8 Corrosion of Copper Alloys(Salt Water Spray)

Fig. 8 Corrosion of Copper Alloys (Salt Water Spray)

Table 7. Approximate Corrosion Resistance of Beryllium Copper

Good (0.025mm / year max.) Limited (0.025-0.25mm / year) Poor (0.25mm / year min.)
Ammonia, dry
Chloride, dry
Sea water (RT)
Gasoline
Citric acid
Acetic acid 0-1%(RT)
Bromine, dry
Steam
Atmosphere, rural, industrial, marine
Hydrochloric acid, up to 5%
Chlorine, moist (RT)
Sea water (60°C)
Acetic acid 2.5%-10% (RT)
Sodium hydroxide up to 10% (RT)
Bromine, moist (RT)
Sulfur dioxide, moist, up to 10%(RT)
Mine water
Sulfuric acid, up to 10% (RT)
Ammonia, moist
Ferric chloride
Hydrochloric acid over 5%
Chlorine, moist (ET)
Chromic acid
Bromine, moist(ET)
Nitric acid
Ammonium hydroxide
Tin, (molton)

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