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A preparation method of metal surface composite phosphate film suitable for warm extrusion

A composite phosphate and metal surface technology, applied in the direction of metal material coating process, etc., can solve problems such as unsatisfactory lubrication, reduced mold life, phosphating layer damage, etc., to meet the requirements of large-scale industrial applications and easy to operate , the effect of strong adsorption

Active Publication Date: 2017-12-05
SHANDONG JIANZHU UNIV
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Problems solved by technology

For warm extrusion of ferrous metals, the general temperature is slightly lower than the recrystallization temperature of ferrous metals. For example, warm extrusion of steel is generally around 900°C. At this time, the phosphating layer is destroyed and satisfactory lubrication cannot be obtained during the extrusion process. , which greatly reduces the life of the mold

Method used

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Embodiment Construction

[0028] The preferred embodiment of the present invention is given below:

[0029] Carry out spheroidizing annealing treatment on the blank after blanking, 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, and the fine burrs on the surface of the blank are removed , strengthen the surface quality; carry out pickling, use 2% sulfuric acid solution for pickling; give the chemical composition ratio according to the invention, configure a composite lithium iron phosphate-calcium phosphate surface treatment solution suitable for ferrous metal warm extrusion : first through the iron oxide Fe 2 o 3 , lithium hydroxide LiOH·H 2 O, lithium hydroxide LiOH·H 2 O, ammonium dihydrogen phosphate (NH 4 ) 2 HPO 4 , carbon source C to synthesize lithium iron phosphate, followed by calcium oxide CaO superfine powder, calcium dihydrogen pho...

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Abstract

The invention relates to the field of metal surface treatment, especially suitable for warm extrusion of ferrous metals. It is necessary to carry out surface treatment on ferrous metal blanks through a composite phosphate solution to obtain a layer of composite lithium iron phosphate-calcium phosphate capable of high temperature resistance. Films are used to increase die life. Given the chemical composition ratio according to the invention, a kind of composite lithium ferrous phosphate-calcium phosphate surface treatment solution suitable for ferrous metal warm extrusion is configured: first pass iron oxide Fe2O3, lithium hydroxide LiOH H2O, lithium hydroxide LiOH H2O, ammonium dihydrogen phosphate (NH4) 2HPO4, carbon source C to synthesize lithium iron phosphate, followed by calcium oxide CaO ultrafine powder, calcium dihydrogen phosphate Ca(H2PO4)2 ultrafine powder, phosphoric acid H3PO4, lithium iron phosphate Ultrafine powder LiFePO4, and distilled water H2O, the mass ratio is: (5‑10): (40‑60): (10‑30): (5‑10): (808‑912). Put the blank to be treated into the phosphating solution at 55°-60°C, 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 relates to the field of metal surface treatment, and is especially suitable for ferrous metals for warm extrusion. It is necessary to carry out surface treatment on ferrous metal blanks through a composite phosphate solution to obtain a layer of composite lithium ferrous phosphate-calcium phosphate salt capable of high temperature resistance. Films are used to increase die life. Background technique [0002] At present, the application of metal surface treatment by phosphating solution is very extensive, and the demand for phosphating metal surface for extrusion industry is very large. In the early 20th century, due to the invention of tool steel and metal surface phosphating technology, the extrusion of ferrous metals was realized. The extrusion of ferrous metals was first used in military industry. The most typical product is bullet casings. In the 1950s, ferrous metals Extrusion began to be used in civilian use, and is currently widel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/07
Inventor 徐淑波李振东任国成程钢
Owner SHANDONG JIANZHU UNIV
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