Beryllium Copper Strip

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

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.

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)
Citric acid
Acetic acid 0-1%(RT)
Bromine, dry
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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