Tungsten wire is not prone to electrochemical corrosion, which is mainly due to its excellent physical and chemical properties.
First of all, tungsten wire has physical properties such as high density, high melting point and high hardness, which make tungsten wire stable in a variety of environments. At the same time, tungsten wire also has good chemical stability and shows strong resistance to air, water and some chemical reagents.
Secondly, the reason why tungsten wire has good corrosion resistance is mainly due to the formation of a dense oxide protective film on its surface. This protective film can effectively prevent oxygen, water and other corrosive substances from contacting the inside of the tungsten wire, thereby greatly extending the service life of the tungsten wire. Especially under high temperature and strong acid and alkali environment, tungsten wire can still maintain good stability, which is also an important manifestation of its corrosion resistance.
However, it should be noted that although tungsten wire has excellent corrosion resistance, under certain specific conditions, such as when voltage is applied to tungsten wire (as anode), tungsten wire may still corrode at the air-electrolyte interface. The electrochemical reaction of this corrosion phenomenon includes the oxidation of tungsten on the anode to tungstate ions, while releasing free electrons, and the water molecules in the electrolyte on the cathode accepting electrons to produce hydroxide ions and hydrogen. But in general, the corrosion in this case is relatively controllable and limited.
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