Method of sacrificial anode transistor-driving in cathodic protection system

• A transistor driven system for magnesium anodes was proposed and explained.
• Driven and non-driven systems were compared.
• Two auxiliary driving electrodes were tested.
• The driven system proved to prolong the anode operating time and their current output.
• For the transistor driven system protection criteria were met.

A magnesium anode driving system has been proposed. A PNP driving transistor has been used. Electrochemical testing in 3%NaCl, results and comparison of the driving system and classic direct anode to cathode connection are presented. The driving system reduced the protection current and stabilized the working conditions of the anode. Higher anode efficiency was achieved. Overprotection and hydrogen embrittlement threats were prevented and the potential of the cathode met the protection criterion. The expected anode operating time has been prolonged.