Mazhef salt
Manganous dihydrogen phosphate
CAS: 18718-07-5
Molecular Formula: H4MnO8P2
Mazhef salt - Names and Identifiers
| Name | Manganous dihydrogen phosphate |
| Synonyms | Mazhef salt Manganesebiphosphate Manganese-2-phosphate manganous diphosphate Manganese phosphate acid Manganesedihydrogenphosphate Manganous dihydrogen phosphate manganese(2+) hydrogen phosphate manganese bis(dihydrogen phosphate) Manganese(Ⅱ) phosphate monobasic tetrahydrate |
| CAS | 18718-07-5 |
| EINECS | 242-520-2 |
| InChI | InChI=1/Mn.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/q+2;/p-2 |
Mazhef salt - Physico-chemical Properties
| Molecular Formula | H4MnO8P2 |
| Molar Mass | 248.91 |
| Boling Point | 158°C at 760 mmHg |
| Water Solubility | soluble H2O; insoluble ethanol [KIR81] |
| Vapor Presure | 1.41mmHg at 25°C |
| Appearance | White or bright red crystals |
| Storage Condition | Room Temprature |
| Sensitive | Easily absorbing moisture |
| Physical and Chemical Properties | White to off-white or reddish Crystal |
| Use | It is mainly used as a phosphating agent for iron and steel rust prevention, especially suitable for large machinery and equipment rust prevention. It is used as a lubricating layer and a protective layer for various weapons in the national defense industry. |
Mazhef salt - Risk and Safety
| Toxicity | 参见金属锰。 |
Mazhef salt - Upstream Downstream Industry
| Raw Materials | Sodium carbonate Phosphoric acid manganese(ii) sulfate Manganese(II) carbonate Ammonium Bicarbonate |
Mazhef salt - Nature
Open Data Verified Data
white, gray-white or with reddish crystals, can be dissolved in water from the hydrolysis of flocculent precipitation, aqueous solution is acidic, insoluble in alcohol. Hygroscopic. Contact with the oxide is easy to deteriorate, there is corrosion.
Last Update：2025-06-10 22:55:16
Mazhef salt - Preparation Method
Open Data Verified Data
- manganese carbonate method: phosphoric acid and manganese carbonate are mixed in a certain proportion to carry out a reaction, and impurities are removed through clarification, and then concentrated, crystallized and centrifuged to obtain manganese acid phosphate.
- manganese sulfate method: manganese sulfate is reacted with soda ash to generate manganese carbonate, which is reacted with phosphoric acid after washing to generate manganese acid phosphate, heated to 70~80 ℃, barium carbonate is added to remove sulfate, and 24h is clarified, and the slag is removed by Suction filtration, the filtrate was concentrated, crystallized and centrifuged to obtain manganese acid phosphate.
Last Update：2025-06-10 22:55:16
Mazhef salt - Introduction
Easy deliquescence, soluble in water to hydrolyze into flocculent precipitate. The aqueous solution is acidic and insoluble in alcohol. It's hygroscopic. It is extremely easy to deteriorate in contact with oxides and has corrosive effects. Dehydrated above 100°C to produce anhydrous.
Last Update：2022-10-16 17:14:36
Mazhef salt - Application
Open Data Verified Data
for steel products, especially large machinery and equipment phosphating treatment, as a phosphating agent, can play a rust prevention effect, in the defense industry used as a variety of weapons and other lubrication layer and protective layer.
Last Update：2025-08-19 16:24:40
Mazhef salt - Safety
Open Data Verified Data
packed in a polypropylene woven bag lined with a polyethylene plastic bag, 25kg or 50kg net per barrel. Should be stored in a cool, ventilated, dry warehouse. The container must be sealed to prevent moisture and heat. Transport should be protected from rain and sun. When loading and unloading should be light to prevent packaging damage. Fire, water, sand and all kinds of fire extinguishing. Toxicity and protection: see manganese metal.
Last Update：2025-06-10 22:55:16
Mazhef salt - Reference Information
| overview | acid manganese phosphate, also known as marzhev salt and manganese dihydrogen phosphate, is a white or light pink crystalline powder. Dissolved in water to hydrolyze into a flocculent precipitate, the solution is acidic, insoluble in alcohol, and hygroscopic. It is extremely easy to deteriorate in contact with oxides and has corrosive effects. When it is higher than 100 ℃, it is dehydrated into anhydrous. |
| toxicity | see metal manganese. |
| chemical properties | white to off-white or reddish crystals. It can be dissolved in water and hydrolyzed to form a flocculent precipitate. The aqueous solution is acidic and insoluble in alcohol. |
| use | mainly used as phosphating agent for steel rust prevention, especially suitable for rust prevention of large-scale mechanical equipment, and used as lubricating layer and protective layer for various weapons in national defense industry used for phosphating treatment of steel products, especially large-scale mechanical equipment, as phosphating agent, which can play an anti-rust effect. Used in the defense industry as a lubricating and protective layer for various weapons, etc. Phosphor sensitizer. |
| production method | manganese carbonate method mixes phosphoric acid and manganese carbonate in a certain proportion for reaction, removes impurities after clarification, and then concentrates, crystallizes and centrifuges to prepare acid manganese phosphate. Its MnCO3 2H3PO4 → Mn(H2P04)2 H2O CO2 ↑ manganese sulfate method reacts manganese sulfate with soda ash to generate manganese carbonate, after washing, reacts with phosphoric acid to generate acid manganese phosphate, heats to 70~80 ℃, adds barium carbonate to remove sulfate, clarifies for 24 hours, drains to remove slag, and the filtrate is concentrated, crystallized and centrifuged to obtain acid manganese phosphate. Its MnSO4 Na2CO3 → MnCO3 Na2SO4MnCO3 2H3PO4 → Mn(H2PO4)2 CO2 ↑ H2O |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
Last Update：2024-04-10 22:29:15
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Raw Materials for Mazhef salt