Tungsten Points’ Corrosion

What influence the tungsten points’ rate are humidity, impurities and metal surfaces state in the air. If air humidity is greater, water film condensation on metal surface will be thicker too, therefore, water film resistance will be smaller and corrosion will faster.

The expression of tungsten points’ corrosion process
W + O2 = W - 4e + O2 = WO2
2WO2 + H2O – e = W2O5 + 2H
W2O5 + H2O - e = 2WO3 + 2H
WO3 + H2O = H2WO4(black gum)
H2WO4 – H2O = WO3(dehydration → tan dura)
The above expression shows that electrochemical corrosion’s nature is metal atom losing electrons and be oxidized process.
How to define electrochemical corrosion process is that metal is destroyed after an electrochemical reaction between electrolyte and metal.

The occurrence conditions of metal electrochemical corrosion:
1. There are potential differences
2. There are electrolytic liquid, etc.
In a humid environment, tungsten points will be corroded (especially when air humidity is higher than 60%), the process is called atmospheric corrosion, is also a species of electrochemical corrosion.

 

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