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Molybdate passivation solution and method for passivating manganese metal by using molybdate passivation solution

A technology of passivating metals and molybdates, applied in the direction of metal material coating process, etc., to achieve the effect of preventing corrosion

Active Publication Date: 2014-06-04
BEIFANG UNIV OF NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, flushing waste water and passivation waste liquid still contain low-priced chromium ions. Although the toxicity is relatively light, it cannot solve the problem of environmental hazards from the source.

Method used

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  • Molybdate passivation solution and method for passivating manganese metal by using molybdate passivation solution
  • Molybdate passivation solution and method for passivating manganese metal by using molybdate passivation solution
  • Molybdate passivation solution and method for passivating manganese metal by using molybdate passivation solution

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Embodiment 1

[0017] (1) Take ammonium molybdate, take triethanolamine and hydroxyhexylidene diphosphoric acid as a complexing agent, then mix ammonium molybdate and complexing agent with distilled water to form a passivation solution, and control the mass fraction of ammonium molybdate to 2.5% , the mass fraction of triethanolamine is 0.7%, and the mass fraction of hydroxyhexylidene diphosphoric acid is 0.1%;

[0018] (2) Soak and passivate the polished metal manganese sheet (irregular flake shape, but the working area is larger than 10mm×10mm) in the obtained passivation solution. The passivation temperature is controlled at 23°C, and the passivation time is 60s. Passivation solution pH6-7. After passivation, the metal manganese sheet was placed in the air to dry naturally (the laboratory temperature was 23°C).

[0019] For the passivated metal manganese, the corrosion rate was calculated by dripping nitric acid-potassium permanganate, soaked in neutral salt water, the Tafel diagram and ...

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Abstract

The invention relates to a molybdate passivation solution and a method for passivating manganese metal by using the molybdate passivation solution. The method is characterized by comprising the following steps of (1) extracting molybdate, blending triethanolamine and etidronic acid to form a complexing agent, adding water into the molybdate and the complexing agent to prepare the passivation solution, wherein the content of ammonium molybdate is controlled to be 1.0 to 4.0 mass percent, the content of the triethanolamine is controlled to be 0.5 to 1.0 mass percent, and the content of the etidronic acid is controlled to be 0.05 to 0.15 mass percent; and (2) passivating the manganese metal in the obtained passivation solution, wherein the passivation temperature is controlled to be 15 to 35 DEG C, the passivation time is controlled to be 30 to 90 seconds, and the pH of the passivation solution is controlled to be 6 to 7. According to the molybdate passivation solution and the method, the complexing agent is effectively selected and matched with the molybdate to passivate the manganese metal to form a layer of molybdate passivation film on the surface of the electrolytic manganese metal, so that the manganese metal is effectively prevented from corrosion; and the method can be used instead of a conventional dichromate passivation method, chromium-free passivation is actually realized from the source, and the aim of zero emission of chromium is fulfilled.

Description

technical field [0001] The invention relates to a molybdate passivation solution and a method for passivating metal manganese with it. Background technique [0002] As an important metal element, manganese is widely used in industry and has a large demand. It is one of the basic raw materials in the metallurgical industry. In order to ensure its commodity value and performance, passivation is an important link in the production of metal manganese by electrolysis. Metal manganese passivation forms a passivation film on its surface to improve its corrosion resistance, so as to ensure the transportation and maintenance of metal manganese. store. [0003] At present, the traditional process of manganese passivation commonly used is chromium passivation, and hexavalent chromium ions are carcinogens, which are extremely harmful to human health and the natural environment. The existing passivation process mainly adopts dichromate passivation, and the electrolytic metal manganese ...

Claims

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Application Information

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IPC IPC(8): C23C22/68
Inventor 罗钊韩凤兰
Owner BEIFANG UNIV OF NATITIES
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