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Surface treatment method for composite sulfuric acid-phosphomycin calcium applicable to warm extrusion

A calcium phosphate salt and surface treatment technology, which is applied in the coating process of metal materials, etc., can solve problems such as unsatisfactory lubrication, phosphating layer damage, and reduced mold life, and meet the requirements of large-scale industrial applications. Strong adsorption Effect, easy operation effect

Inactive Publication Date: 2015-07-15
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

[0023] The preferred embodiment of the present invention is given below:

[0024] 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 sulfuric acid-calcium phosphate surface treatment solution suitable for ferrous metal warm extrusion: including oxidation Calcium CaO, Calcium Sulfate CaSO 4 , calcium dihydrogen phosphate Ca(H 2 PO 4 ) 2 , phosphate H 3 PO 4 , sulfuric acid H 2 SO 4 and distilled water H 2 Composed of O, its mass ratio is: (5-10): (15-30): (40-60): (10-30): (5-10): (808-912). In this embodiment...

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Abstract

The invention relates to the field of metal surface treatment, and in particular relates to a surface treatment method for black metal in warm extrusion, wherein a black metal blank is subjected to surface treatment by using a sulfuric acid-phosphomycin calcium solution, and a high-temperature resisting sulfuric acid-phosphomycin calcium film, so that the service life of a mold is prolonged. The surface treatment method comprises the following steps: mixing calcium oxide CaO superfine powder, calcium sulfate CaSo4 superfine powder, monocalcium phosphate Ca(H2PO4)2 superfine powder, phosphoric acid H3PO4, sulfuric acid H2SO4 and distilled water H2O in proportion, reacting to generate a calcium sulfate CaSO4 and monocalcium phosphate Ca(H2PO4)2 solution, performing shot blasting and pickling on the blank, performing phosphorization, dehydrogenation and saponification on the solution so as to obtain a black metal extruded blank with a composite sulfuric acid-phosphomycin calcium surface film.

Description

technical field [0001] The invention relates to the field of metal surface treatment, especially suitable for warm extrusion of ferrous metals. It is necessary to perform surface treatment on ferrous metal blanks with a composite sulfuric acid-phosphate solution to obtain a layer of composite sulfuric acid-calcium phosphate film capable of high temperature resistance. Used to increase mold 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 widely used in the field ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/22
Inventor 徐淑波景财年任国成林晓娟范小红李振东
Owner SHANDONG JIANZHU UNIV
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