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An electrolytic polishing method for complex brass

An electrolytic polishing, complex brass technology, applied in the field of electrolytic polishing solution and electrolytic polishing, can solve the problems of unstable mechanical polishing quality, low efficiency, over-corrosion of complex brass, etc., to reduce the experimental work intensity, simple formula, The effect of a good polishing effect

Inactive Publication Date: 2017-03-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the mechanical polishing quality is unstable and the efficiency is low during the metallographic sample preparation process of complex brass, and the existing electrolytic polishing method will cause over-corrosion of complex brass, thereby providing a complex brass electrolytic polishing method

Method used

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  • An electrolytic polishing method for complex brass
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  • An electrolytic polishing method for complex brass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. The selected sample is cast complex aluminum brass, the chemical composition (mass percentage) is: 64.76% Cu, 22.27% Zn, 1.92% Fe, 7.49% Al, 2.51% Mn, 0.22% Pb, 0.52% Ni;

[0047] 2. Grind the metallographic sample in the order of 400#, 800#, 1500#, 2500#, 5000# sandpaper. When changing the sandpaper, the grinding direction of the sample should be changed to π / 2, and there is no upper A wear mark of sandpaper, the lubricant is water;

[0048] 3. Mechanical polishing can be done according to the general metallographic sample polishing process, using short woolen cloth, 0.3μmAl 2 o 3 The polishing paste and the lubricant are water, the rotational speed of the polishing disc is 300r / min, and the surface is polished until there are no scratches visible to the naked eye. During the polishing process, attention should be paid to the lighter the force at the later stage of polishing, and the direction of the sample should be kept unchanged during the polishing process to ...

Embodiment 2

[0052] 1. The selected sample is normalized complex aluminum brass, the chemical composition (mass percentage) is: 64.76% Cu, 22.27% Zn, 1.92% Fe, 7.49% Al, 2.51% Mn, 0.22% Pb, 0.52% Ni ;

[0053] 2. Grind the metallographic sample in the order of 400#, 800#, 1500#, 2500#, 5000# sandpaper. When changing the sandpaper, the grinding direction of the sample should be changed to π / 2, and there is no upper A wear mark of sandpaper, the lubricant is water;

[0054] 3. Mechanical polishing can be done according to the general metallographic sample polishing process, using short woolen cloth, 0.3μm Al 2 o 3 The polishing paste and the lubricant are water, the rotational speed of the polishing disc is 300r / min, and the surface is polished until there are no scratches visible to the naked eye. During the polishing process, attention should be paid to the lighter the force at the later stage of polishing, and the direction of the sample should be kept unchanged during the polishing pr...

Embodiment 3

[0058] 1. The selected sample is as-cast complex manganese brass, the chemical composition (mass percentage) is: 60.28% Cu, 33.3% Zn, 0.29% Fe, 2.09% Al, 1.96% Mn, 1.05% Si, 0.43% Pb;

[0059] 2. Grind the metallographic sample in the order of 400#, 800#, 1500#, 2500#, 5000# sandpaper. When changing the sandpaper, the grinding direction of the sample should be changed to π / 2, and there is no upper A wear mark of sandpaper, the lubricant is water;

[0060] 3. Mechanical polishing can be done according to the general metallographic sample polishing process, using short woolen cloth, 0.3μm Al 2 o 3 The polishing paste and the lubricant are water, the rotational speed of the polishing disc is 300r / min, and the surface is polished until there are no scratches visible to the naked eye. During the polishing process, attention should be paid to the lighter the force at the later stage of polishing, and the direction of the sample should be kept unchanged during the polishing process...

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Abstract

An electrolytic polishing method for complex brass is disclosed. The method includes (1) grinding complex brass and then preforming mechanical polishing, (2) performing electrolytic polishing, with the complex brass after mechanical polishing being adopted as an anode, a lead block being adopted as a cathode, an electrolytic polishing direct voltage being 1-4 V, a current being 0.1-4 A, an electrolytic polishing temperature being room temperature, and electrolytic polishing time being 5-30 s, and (3) taking the complex brass out after electrolytic polishing, washing with absolute ethanol and then drying the complex brass to obtain a product, wherein an electrolytic polishing liquid comprises H3PO4, gelatin and oxalic acid, 2-4 g of the gelatin and 2-4 g of the oxalic acid are added for each 30-70 mL of the H3PO4 and the H3PO4 concentration is not less than 85%. According to the method, requirements on previous mechanical polishing quality before the electrolytic polishing are low, the electrolytic polishing can be operated at room temperature, and the electrolytic polishing liquid is simple in formula, nontoxic, nonirritant and nonvolatile, and can be stored for a long term and repeatedly used.

Description

technical field [0001] The invention relates to an electrolytic polishing liquid and an electrolytic polishing method using the polishing liquid, in particular to a complex brass electrolytic polishing liquid and an electrolytic polishing method using the electrolytic polishing liquid. Background technique [0002] Complex brass is a multi-element alloy formed by adding iron, manganese, silicon, aluminum and other elements on the basis of copper-zinc binary alloy. It has the characteristics of high strength, low friction coefficient, good wear resistance and good processability, so in It is widely used in equipment manufacturing, mechanical parts and automobile synchronizer ring preparation. When observing complex brass structures, polishing treatment has a key influence on the observation results. The purpose of polishing treatment is to remove burrs and scratches on the surface of the metallographic sample and make the metallographic surface smooth. At present, the commo...

Claims

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Application Information

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IPC IPC(8): C25F3/22
CPCC25F3/22
Inventor 殷福星方前常若斌方伟刘宝玺
Owner HEBEI UNIV OF TECH
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