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Sodium Molybdate

Sodium molybdate (Na2MoO4), often encountered as the dihydrate (Na2MoO4·2H2O), is a white, crystalline salt with a wide range of applications. Here's a breakdown of its key aspects:

Properties:

1. High solubility in water: Makes it easily usable in various aqueous applications.
2. Non-combustible: Relatively safe to handle in terms of flammability.
3. Slightly alkaline: Exhibits a weak basic character.

Applications:

1. Agriculture: Used as a micronutrient for crops, addressing molybdenum deficiencies that can hinder plant growth and yield. It can be applied as a seed dressing or foliar spray.
2. Corrosion inhibition: Acts as an anodic inhibitor in various fluids, protecting metals from corrosion.
3. Chemical catalyst: Employed in specific chemical reactions, though less common compared to other uses.
4. Fire retardants and pigments: Used in limited applications due to the availability of more efficient alternatives.

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Sodium Molybdate

Product Description

Sodium molybdate is a compound composed of sodium (Na), molybdenum (Mo), and oxygen (O). Its chemical formula is Na2MoO4.

Sodium molybdate has several applications across various industries. One of its main uses is as a corrosion inhibitor in industries such as water treatment, oil and gas, and automotive. It forms a protective layer on metal surfaces, preventing or slowing down the corrosion process.

Sodium molybdate characteristics

Shape

Crystalline powder

Molecular formula

Na2MoO4

CAS #

7631-95-0

EINECS

231-551-7

Molar mass

205.92 g/mol

Density

3.78g/cm3

Melting point

687℃

Solubility in water

84g/100ml（100℃)

Sodium Molybdate Applications

1. Metal Corrosion Inhibitor for iron and steel

Sodium molybdate is commonly used as a metal corrosion inhibitor for iron and steel, and is commonly found in water treatment products like chiller systems, where bimetallic design and construction can raise the risk of metal corrosion.

This additive is primarily used in closed-loop systems, and is regarded to be far superior to other corrosion inhibitors like sodium nitrate. At concentrations of just 50 to 100 ppm, sodium molybdate offers superior performance compared to 800+ ppm concentrations of sodium nitrate.

2. Agricultural Additive For Fertilizer

Sodium molybdate is widely used as an agricultural additive on farms. It’s an ideal choice for fertilizer applications. This is because the basic chemistry of molybdate compounds like sodium molybdate include molybdenum oxide at its highest oxidation state.

This means that the chemical is highly-soluble in water. This means that fertilizers using sodium molybdate easily combine and mix with water and soak into soil, delivering molybdenum oxide and other valuable micronutrients into the roots and minimizing runoff, which wastes chemical compounds and can have negative environmental consequences.

Sodium molybdate is particularly popular among farmers who primarily focus on legumes like lentils, beans, alfalfa, and peanuts. It helps with the uptake of nitrogen, ensuring efficient nitrogen-fixing for these plants, and allowing nitrogen to be synthesized into ammonia and essential amino acids.

3. Hydroponic Farming & Agriculture

Similarly to traditional soil-based fertilizer applications, sodium molybdate can be used in hydroponic farming, which uses inert substrates as the growing medium instead of soil. Mineral nutrient solutions are delivered directly to the plants using water, so highly-soluble nutrients and fertilizers – such as sodium molybdate – are very desirable for these purposes.