Molybdenum Electrode Chemical Property

molybdenum electrodes

Chemical properties are the nature which manifested in chemical change, such as acidic, alkaline, oxidation, reduction, thermal stability and other properties. Chemical properties and chemical change is inherent characteristics in any physical. All material is through chemical properties and chemical changes to distinguish their vastly different with other substances. What’s more chemical properties are relatively static of substances, but chemical change is the relative movement of substances.

The chemical property of molybdenum electrode are as follows: at room temperature in air or water molybdenum electrodes are stable, but when the temperature reached 400℃ it will cause slight oxidation, when temperature reached 600℃ will cause violent oxidized to generate molybdenum trioxide. Besides, molybdenum electrodes are not dissolved in hydrochloric acid, hydrofluoric acid, nitric acid and alkali solution. However molybdenum electrodes can be dissolved in nitric acid, aqua regia or hot sulfuric acid solution.

Molybdenum electrode even at a high temperature not react with hydrogen, but at 1500 ℃ can react with nitrogen to generate molybdenum nitride. Over 1100~1200℃ can react with carbon, carbon monoxide and hydrocarbons to obtain MoSi2 and MoSi2. But even in 1500 ~ 1700 ℃oxidizing atmosphere molybdenum electrodes still quite stable and will not be oxidized decomposed.

Medium
Experiment Condition
Reaction Condition
Water
Non-corroding
HF
Cold, hot
Non-corroding
HF+H2SO4
Cold
Non-corroding
Hot
Slight corrosion
HF+aqua regia
Cold
Slight corrosion
Hot
Rapid corrosion
HF+HNO3
Cold, hot
Rapid corrosion
Ammonium hydroxide
Non-corroding
Molten caustic soda
In air
Slight corrosion
Oxidant like in KNO3, KNO2,KclO3,PbO2
Rapid corrosion
Boron
High temperature
Generate boride
Carbon
Above 1100℃
Generate carbide
Silicon
Above 1100℃
Generate silicide
Phosphorus
To maximum temperature
Non-corroding
Sulfur
Above 440℃
Generate sulfide
Iodine
Under 790℃
Non-corroding
Bromine
Under 840℃
Non-corroding
Chloride
Above 230℃
Active corrosion
Fluorine
Room temperature
Active corrosion
Air and oxygen
400℃
Starts to oxidize
600℃
Intense oxidant
Above 700℃
MoO3 sublimation
Hydrogen and inert gas
To maximum temperature
No reaction
CO
Above 1400℃
Generate carbide
CO2
1200℃
oxidation
Hydrocarbon
1100℃
Generate carbide
Al Ni Fe Co Sb
Molten mass
Active corrosion
Zn
Molten mass
Slight corrosion
Bi
Molten mass
Highly corrosion
Glass
Molten mass
Highly corrosion
Refractory oxide like Al2O3,ZrO2,BeO,MgO,ThO2
Under 1700℃
Non-corroding
Nitrogen
Above 1100℃
Nitridation reaction

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