The criterion of -850mV is referenced to which electrode?

The criterion of -850 mV is referenced to the Copper Sulfate Electrode (CSE), which is commonly used in cathodic protection practices. When assessing galvanic or cathodic protection systems, the potential of a structure is measured against this standard reference electrode to determine the effectiveness of cathodic protection. The -850 mV criterion indicates the desired potential to protect steel structures submerged in electrolyte, ensuring that the potential is negative enough to prevent corrosion.

Utilizing the Copper Sulfate Electrode offers a reliable and consistent measurement, as it provides a stable reference point for evaluating the protection levels of pipelines and other structures exposed to corrosive environments. The -850 mV represents a threshold that indicates sufficient cathodic protection is being achieved, making it a standard reference point in the field.