Cathodic Electrochemical Protection Of Molybdenum Electrodes In An All-Electric Melter

During several research programmes, the cathodic protection of molybdenum heating electrodes was tested step-by-step on an all-electric glass melting furnace over eight years. Starting with one pair at least, all 12 heating electrodes were superimposed with a negative direct voltage to reduce the corrosion of molybdenum. The molybdenum release of the electrodes could nearly be halved at the used furnace and with the glass melted. The molybdenum content of the glass was determined to compare the unprotected and the protected state, respectively, and to confirm the success of the cathodic protection.