Sodium Molybdate; Disodium molybdate, cas no : 7631-95-0; 10102-40-6 (dihydrate), It is used in industry for corrosion inhibition, as it is a non-oxidizing anodic inhibitor.
The addition of sodium molybdate significantly reduces the nitrite requirement of fluids inhibited with nitrite-amine, and improves the corrosion protection of carboxylate salt fluids.
Synonyms: Disodium molybdate;disodium,(T-4)-Molybdate;disodiummolybdate;Molybdate (MoO42-), disodium, (T-4)-;Molybdate (MoO42-), disodium, (T-4)-;molybdic;Molybdic acid (H2MoO4), disodium salt;Molybdic acid, disodium salt
CAS: 7631-95-0
In water treatment, sodium molybdate (Na2MoO4) has proven to be a superior corrosion inhibitor in open recirculating cooling systems and closed recirculating cooling systems.
It is often applied at lower levels and in combination with other inhibitors, such as inorganic and organic phosphates.
IUPAC name: Sodium molybdate
Other names: Disodium molybdate
CAS Number: 7631-95-0 check; 10102-40-6 (dihydrate)
Sodium molybdate, Na2MoO4, is useful as a source of molybdenum.
It is often found as the dihydrate, Na2MoO4·2H2O.
The molybdate(VI) anion is tetrahedral. Two sodium cations coordinate with every one anion.
Sodium molybdate was first synthesized by the method of hydration.
A more convenient synthesis is done by dissolving MoO3 in sodium hydroxide at 50–70 °C and crystallizing the filtered product.[3] The anhydrous salt is prepared by heating to 100 °C.
Uses
The agriculture industry uses 1 million pounds per year as a fertilizer. In particular, its use has been suggested for treatment of whiptail in broccoli and cauliflower in molybdenum-deficient soils.
However, care must be taken because at a level of 0.3 ppm sodium molybdate can cause copper deficiencies in animals, particularly cattle.
It is used in industry for corrosion inhibition, as it is a non-oxidizing anodic inhibitor.
The addition of sodium molybdate significantly reduces the nitrite requirement of fluids inhibited with nitrite-amine, and improves the corrosion protection of carboxylate salt fluids.
In industrial water treatment applications where galvanic corrosion is a potential due to bimetallic construction, the application of sodium molybdate is preferred over sodium nitrite.
Sodium molybdate has the advantage in that the dosing of lower ppm's of molybdate allow for lower conductivity of the circulating water.
Sodium molybdate at levels of 50-100 ppm offer the same levels of corrosion inhibition that sodium nitrite at levels of 800+ ppm.
By utilizing lower concentrations of sodium molybdate, conductivity is kept at a minimum and thus galvanic corrosion potentials are decreased.
Chemical formula: Na2MoO4
Molar mass: 205.92 g/mol (anhydrous)
241.95 g/mol (dihydrate)
Appearance: White powder
Density: 3.78 g/cm3, solid
Melting point: 687 °C
Solubility in water: 84 g/100 ml (100 °C)
Refractive index (nD): 1.714
Safety
Sodium molybdate is incompatible with alkali metals, most common metals and oxidizing agents. It will explode on contact with molten magnesium. It will violently react with interhalogens (e.g., bromine pentafluoride; chlorine trifluoride).
Its reaction with hot sodium, potassium or lithium is incandescent.
MOLYBDENUM PRODUCTS
PRODUCT NAME
Ammonium Dimolybdate
Ammonium Molybdate
Ammonium Heptamolybdate, ACS Reagent Grade
Ammonium Molybdate
Ammonium Molybdate Tetrahydrate
Ammonium Phosphomolybdate
Ammonium Tetrathiomolybdate
Barium Molybdate
Calcium Molybdate
Basic Calcium Molybdate 212
Calcium Molybdate
Lead Molybdate
Lithium Molybdate
Molybdenum, Metal Powder
Molybdenum Dioxide
Molybdenum Disilicide
Molybdenum Disulfide
PRODUCT NAME
Molybdenum Trioxide
Molybdic Acid (85%), ACS Reagent Grade
Molybdosilicic Acid
Nickel Molybdate
Phosphomolybdic Acid
Potassium Molybdate
Sodium Molybdate
Sodium Molybdate
Sodium Molybdate Dihydrate
Sodium Molybdate Anhydrous
Strontium Molybdate
Zinc Molybdate
Basic Zinc Molybdate 101
Zinc Molybdate
Sodium molybdate
12680-49-8 [RN]
231-551-7 [EINECS]
7631-95-0 [RN]
Dinatriumdioxido(dioxo)molybdaen [German] [ACD/IUPAC Name]
Dioxo(dioxydo)molybdène de disodium [French] [ACD/IUPAC Name]
Disodium dioxido(dioxo)molybdenum [ACD/IUPAC Name]
Molybdenum, diolatodioxo-, sodium salt (1:2) [ACD/Index Name]
sodium molybdate (anhydrous)
Sodium Molybdate, anhydrous
[7631-95-0]
10102-40-6 [RN]
106463-33-6 [RN]
14666-91-2 [RN]
231-107-2 [EINECS]
disodium diketo-dioxido-molybdenum
disodium dioxido-dioxomolybdenum
disodium dioxido-dioxo-molybdenum
Disodium molybdate
disodium tetraoxomolybdate
disodium;dioxido(dioxo)molybdenum
EINECS 231-551-7
Molybdate (MoO42-), disodium, (T-4)-
Molybdate (MoO42-), disodium, (β-4)-
Molybdate disodium
Molybdic acid (H2MoO4) , disodium salt
Molybdic acid (H2MoO4), disodium salt (8CI)
MOLYBDIC ACID DISODIUM SALT
Molybdic acid, disodium salt
Na2MoO4
Natriummolybdat [German]
Natriummolybdat
Natriummolybdat [German]
sodium dioxido(dioxo)molybdenum
sodium molybdate (anh.)
Sodium molybdate (Na2MoO4)
Sodium molybdate (VAN)
Sodium Molybdate 35% Solution
Sodium Molybdate ACS
Sodium Molybdate Anhydrous
Sodium Molybdate Crystals, Technical Grade
Sodium molybdate dihydrate
Sodium Molybdate Dihydrate (Technical Grade)
Sodium Molybdate Solution 35%
Sodium molybdate(VI)
Sodium Molybdate, ACS Grade
sodium orthomolybdate
sodiummolybdate
A laboratory study was conducted on the corrosion inhibition of low carbon steel by sodium molybdate in simulated cooling waters.
The inhibiting efficacy of sodium molybdate is shown to be influenced by water composition and by the presence of other water treatment chemicals.
More molybdate is required to protect steel in softer waters and in those containing high chloride and sulphate concentrations.
Some common water treatment chemicals, notably an alkyl phosphonate, sodium nitrite, zinc salt and sodium gluconate, synergistically improve molybdate inhibition.
Recent data which show the insensitivity of fish and fish food to sodium molybdate are presented
Molybdate-containing corrosion inhibotors are becoming more attractive in an increasing number of commercial applications. Sodium molybdate inhibits corrosion of low carbon steel, copper and brass in recirculating cooling water systems while being environmentally safe. These compounds are also economical at the concentration required for effective water treatment. Molybdenum is tolerated in various concentrations by many life forms. Molybdenum compounds are characterized as nontoxic in US Public Health Bulletin 293, by the Federal Hazardous Substances Labeling Act, and by the Occupational Safety and Health Act. The nature of molybdate inhibition was discussed. Molybdate inhibits by adsorption. This necessitates the use of more molybdate to protect steel in typical waters than is required for protection in distilled water. Sodium molybdate inhibition has been investigated in waters of varying composition and pH. Several multi-component inhibitor systems which contained sodium molybdate were studied. Several advantages of molybdates beyond general ferrous metals corrosion inhibition can be shown which have important commercial implications. These include inhibitions of pit propagation, and of crevice and nonferrous metals corrosion. The effect of sodium molybdate on the corrosion inhibition of copper was studied in soft water. Potentiodynamic polarization experiments were performed with aluminum in deaerated high chloride and high chloride
BOILERS; FEEDWATER; CORROSION INHIBITORS; MOLYBDATES; SODIUM COMPOUNDS; BRASS; COPPER; ECONOMICS; IRON; WATER; WATER TREATMENT; ALKALI METAL COMPOUNDS; ALLOYS; COPPER ALLOYS; COPPER BASE ALLOYS; ELEMENTS; HYDROGEN COMPOUNDS; METALS; MOLYBDENUM COMPOUNDS; OXYGEN COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; ZINC ALLOYS; 360105* - Metals & Alloys- Corrosion & Erosion
Corrosion Inhibitors are used in both open & closed recirculating cooling water treatment products. Benzotriazole (BZT) is a similar, but less common inhibitor. Sodium Molybdate is also used in cooling water treatment as a corrosion inhibitor. Molybdenum is used both as an inhibitor and as a trace chemical to monitor dosage measurements due to its yellow color.
Sodium Nitrite is another common metal corrosion inhitor for iron & steel and is typically used in closed-loop cooling water treatment products, such as chiller systems. (Other allied products which accompany these products are borates which act as buffers/stabilizers and have general cleaning attributes as well.)
Sodium Molybdate is a free flowing soluble crystalline fertiliser and is used to supply the trace element molybdenum to crops and livestock in various situations. ... Sodium Molybdate is suitable for foliar or fertigation application on a wide range of horticultural and broad acre crops and pastures.
Why the Agriculture Industry Uses Sodium Molybdate
WHAT IS SODIUM MOLYBDATE?
There are two main forms of Sodium Molybdate. Sodium Molybdate, Dihydrate is a crystalline powder. It loses its water of crystallization at 100 degrees Celsius. It is known to be less toxic than the other corresponding compounds of group 6B elements in the periodic table. Sodium Molybdate, Dihydrate is used in the manufacturing of inorganic and organic pigments, as a corrosion inhibitor, as a bath additive for finishing metals finishing, as a reagent for alkaloids, and as an essential micronutrient for plants and animals.
Sodium Molybdate, Anhydrous is a small, lustrous, crystalline plate. It has the melting point of 687 degrees Celsius and a density of 3.28 (18C). It is soluble in water and also noncombustible. It can be used for reagent in analytical chemistry, paint pigment, production of molybdated toners and lakes, metal finishing, brightening agent for zinc plating, corrosion inhibitor, catalyst in dye and pigment production, additive for fertilizers and feeds, and micronutrient.
WHY THE AGRICULTURE INDUSTRY USES SODIUM MOLYBDATE
Sodium Molybdate uses cover a wide range of fields, including manufacturing, metalwork, printing, and more.
But the impact it can have on plants and animals has brought it into the forefront of use for the agriculture industry, to the tune of more than 1 million pounds of sodium molybdate fertilizer used per year.
The basic chemistry of a molybdate, such as sodium molybdate, contains the element molybdenum in its highest oxidation state, which in turn helps contribute to a high solubility of the chemical in water, a benefit in fertilizer application.
This characteristic, when combined with sodium molybdate’s use as a delivery vessel for essential micronutrients (such as molybdenum) in plants, serves as another key reason for the choice of sodium molybdate fertilizer over other types of fertilizers used in agriculture.
Another touchpoint for this usage ties back to the hydroponic nutrient practice that is growing in popularity.
Hydroponics is an agricultural method in which plants are grown without soil.
Instead, they receive their essential micronutrients through a water solvent, a practice that has shown growth rates almost 50 percent faster than traditional soil-grown plants, in addition to a higher yield from hydroponic plants.
Sodium molybdate has seen a particularly strong uptick in usage among farmers of leguminous plants, such as alfalfa, peas, beans, lentils and peanuts.
Included in fertilizer, it provides these plants with enhanced uptake of the essential nitrogen element, while also allowing for efficient fixing of atmospheric nitrogen found in the atmosphere by bacteria in the legumes.
These bacteria convert the nitrogen into ammonia to synthesize amino acids within the plant.
Overall, the use of sodium molybdate in the agricultural industry can be summarized in that it is one of the few chemicals that can provide essential micronutrients and help drive plant function in a form that is both efficient and effective.
Efficiency is shown not only by the relatively small amounts needed to make an impact on the treated plants, but also in the ability to administer the chemical in easily-absorbed water-based formats.
;Disodium molybdate, cas no : 7631-95-0 ☑
10102-40-6 (dihydrate), It is used in industry for corrosion inhibition, as it is a non-oxidizing anodic inhibitor. The addition of sodium molybdate significantly reduces the nitrite requirement of fluids inhibited with nitrite-amine, and improves the corrosion protection of carboxylate salt fluids.Synonyms: Disodium molybdate;disodium,(T-4)-Molybdate;disodiummolybdate;Molybdate (MoO42-), disodium, (T-4)-;Molybdate (MoO42-), disodium, (T-4)-;molybdic;Molybdic acid (H2MoO4), disodium salt;Molybdic acid, disodium salt
CAS: 7631-95-0
