In cathodic protection, a negative potential is typically measured against which type of electrode?

In cathodic protection, a negative potential is typically measured against a copper/copper sulfate electrode. This type of electrode is commonly used in soil corrosion measurements because it provides reliable and stable readings of potential for underground structures, like pipelines or storage tanks, that require protection from corrosion.

The copper/copper sulfate electrode operates by measuring the voltage difference between the protected structure and a known reference point, which helps in analyzing the effectiveness of the cathodic protection system. When the potential is measured, a negative reading indicates that the structure is cathodically protected, meaning it is receiving sufficient current to prevent corrosion.

Utilizing a copper/copper sulfate reference helps ensure that the readings are consistent and aligned with industry standards, making it essential for monitoring and maintaining the integrity of underground assets. This electrode's specific electrochemical behavior and reliability in various environments make it the preferred choice for such measurements in cathodic protection.