Molybdenum Electrode Chemical Property

Molybdenum Electrode Picture

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