A kind of preparation method of lithium ferrous phosphide high temperature resistant phosphating film material for metal

A technology of lithium ferrous phosphide and lithium ferrous phosphate, applied in the direction of metal material coating process, can solve the problems of unsatisfactory lubrication, damage of phosphide layer, reduction of mold life, etc., to reduce the harm of hydrogen embrittlement, Good corrosion resistance, good effect

Active Publication Date: 2017-10-13
东莞市颖兴金属表面处理材料有限公司
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Problems solved by technology

For metal hot extrusion, the general temperature is higher than the recrystallization temperature of the metal. For example, the hot extrusion of steel is generally around 1000°C. At this time, the phosphating layer is destroyed, and satisfactory lubrication cannot be obtained during the extrusion process. Reduced mold life

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  • A kind of preparation method of lithium ferrous phosphide high temperature resistant phosphating film material for metal

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Embodiment Construction

[0033] The preferred embodiment of the present invention is given below:

[0034] Spheroidizing and annealing the blank after cutting, the heating temperature should be lower than the recrystallization temperature of the material below 50°C and keep warm for 3-4 hours; the blank is shot peened for 15 minutes by a shot blasting machine to remove the fine burrs on the surface of the blank and strengthen Surface quality; pickling, using 2% sulfuric acid solution for pickling. According to the invention, the chemical composition ratio is given, including Fe 2 o 3 , LiOH·H 2 O, (NH 4 ) 2 HPO 4 , carbon source, its mass ratio is: (159.68): (65.88): (254.11): (12). The dried LiOH·H 2 O, (NH 4 ) 2 HPO 4 Put it together with the weighed ferric oxide and carbon, stir well with a glass rod, put it into a box-type resistance furnace, slowly raise the temperature from room temperature 20°C, and keep it warm when the resistance furnace rises to 500-800°C After cooling for 30 minu...

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Abstract

The invention discloses a method for preparing a high-temperature-resistant lithium iron phosphide high-temperature-resistant phosphating film material for metals, belonging to the technical field of metal surface treatment, and the invention is obtained through the following steps. Firstly, the metal substrate is selected, and the metal surface is cleaned, and the chemical composition is given according to the invention, and the mass ratio is: (159.68): (65.88): (254.11): (12). Put the above-mentioned substances into a crucible, fully stir them with a glass rod, put them into a box-type resistance furnace, slowly raise the temperature from a room temperature of 20°C, and keep the temperature for 30min when the resistance furnace rises to 500‑800°C to obtain a solid lithium iron phosphate . Put the obtained lithium iron phosphate powder and phosphoric acid in a phosphating solution with a mass ratio of 1:2, put the blank to be treated into the phosphating solution, and the blank can obtain a dark gray phosphating film. Finally, the blank is heated to remove hydrogen to reduce the harm of hydrogen embrittlement. The saponification process is carried out to further enhance the lubrication between the extrusion billet and the die.

Description

technical field [0001] The invention belongs to the field of phosphating film preparation of industrial metals, in particular to a high temperature resistant lubricating phosphating film used for hot extrusion metal blanks and semi-finished products. It is necessary to carry out surface treatment on the metal blank by phosphate solution, and obtain a layer of lithium iron phosphate film capable of high temperature resistance on the metal blank, so as to improve the life of the hot extrusion die and the surface quality of the metal blank. Background technique [0002] Phosphating technology is the process of surface-treating metals with phosphating solution agents to form a uniform, fine, corrosion-resistant phosphating film on the surface. In principle, it belongs to chemical conversion coating treatment, so phosphating is sometimes called For chemical conversion coating treatment. Phosphating treatment is widely used in industry, mainly for rust prevention, lubrication and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/07
Inventor 徐淑波任国成范小红林晓娟
Owner 东莞市颖兴金属表面处理材料有限公司
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