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Current Density Is Important to Service Life of Molybdenum Electrode

Current density is one of the most important parameters for designing the glass electric melting furnace, which is also a very important factor that affects the service life of molybdenum electrode. Controlling the right current density helps the extension of electrode’s working life. 

Molybdenum electrodes are simultaneously subjected to the combined effects of electricity, high temperature and corrosion during smelting. Chemical corrosion and electrochemical corrosion are unavoidable. The experimental analysis shows that the corrosion rate of the electrode is closely related to the current density in the same molten glass.

When the current density is low, the temperature of the moly electrode is lower than the molten glass’s. As the current density increases, the temperature of the electrode reaches or even exceeds the temperature difference of the molten glass. If the relationship between the corrosion rate and the temperature in the medium alkali glass is quantitatively detected, it will be found that the higher the temperature, the greater the corrosion rate. Based on the results of various research experiments, it can be judged that if the current density increases and the temperature of the electrode area rises, it will affect chemical reaction process of the electrode, change flow state of the glass in the electrode area, and finally corrode molybdenum electrode rapidly.

The temperature of electrode is proportional to the current density, and its critical current density value can be 0.4-0.7A/cm2, according to a large number of production experiments. Under this current density, 8-10mm thickness of electrode can work for more than 2 years. The maximum allowable current density is about 2-3A/cm2. In order to make the corrosion less, if it is alkali-free glass, the current load should be smaller. When the current density is less than 1.00A/cm2, the molybdenum electrode can better resist the corrosion of the molten glass. On the contrary, when the current density is higher than 1.00A/cm2, the corrosion rate will naturally increase, and bubbles will be generated on the interface between the molybdenum electrode and the molten glass.

In short, controlling the current density reasonably in glass melting is essential for the application of molybdenum electrode. Chinatungsten Online provides high-purity and high-quality molybdenum electrode worldwide. 

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