Final answer:
In certain locations for E3 protection, sacrificial electrodes have been bonded to the composite material and used in conjunction with numerous conductive materials. Sacrificial electrodes, such as those made of magnesium, are used in strategies to protect underground tanks or pipes. These electrodes are more cost-effective to replace than the iron objects they are protecting.
Step-by-step explanation:
In certain locations for E3 protection, sacrificial electrodes have been bonded to the composite material and used in conjunction with numerous conductive materials. Sacrificial electrodes, such as those made of magnesium, are used in strategies to protect underground tanks or pipes. These electrodes are more cost-effective to replace than the iron objects they are protecting.