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Preparation method for phosphating ferrous lithium high-temperature-resistant phosphating film material for metal

A technology of lithium ferrous phosphide and lithium ferrous phosphate, which is applied in the coating process of metal materials, can solve the problems of reduced mold life, phosphating layer damage, and unsatisfactory lubrication, so as to reduce the harm of hydrogen embrittlement, Good corrosion resistance, good effect

Active Publication Date: 2015-11-18
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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  • Preparation method for phosphating ferrous lithium 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): (115.03): (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 f...

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Abstract

The invention relates to a preparation method for a phosphating ferrous lithium high-temperature-resistant phosphating film material for metal and belongs to the technical field of metal surface treatment. The preparation method includes the following steps that firstly, a metal matrix is selected, the surface of the metal is cleaned, chemical components are given according to the method, and the mass ratio of the chemical components is (159.68):(65.88):(115.03):(254.11):(12); the components are placed in a crucible, fully and evenly stirred through a glass bar and then placed in a box-type resistance furnace, the temperature is slowly increased from the room temperature of 20 DEG C, heat preservation is conducted for 30 min when the temperature of the resistance furnace is increased to 500-800 DEG C, and solid lithium iron phosphate is obtained; a phosphating solution is prepared from the obtained powder lithium iron phosphate and phosphoric acid according to the mass ratio of 1:2, a blank to be treated is placed in the phosphating solution, and a dark grey phosphating film can be obtained by the blank; a heating dehydrogenation process is finally conducted on the blank, so that the hazard of hydrogen embrittlement is reduced; and a saponification process is conducted, so that lubrication between the squeezed blank and a die is further enhanced.

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 liquid 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 p...

Claims

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Application Information

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Patent Type & Authority Applications(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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