Electrolytic solution, electrolysis case, electropolishing system, and electropolishing method using these

a technology of electrolysis solution and electrolysis case, which is applied in the field of electrolysis solution, can solve the problems of high equipment renewal cost, high cost, and difficult operation, and achieve the effects of reducing workload, shortening operation time, and holding viscous electrolytic solution

Inactive Publication Date: 2013-12-05
MARUI MEKKI INDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the aging deterioration, stain and rust would adhere to an inner surface of the tank.
Since the renewal of equipment is very expensive, there is a method of prolonging the life of the tank by a temporary repair, that is, a mechanical polishing like the buffing.
It is an extremely hard operation.
In addition, a simple buffing treatment breaks the surface texture and causes the rusts and deterioration.
The electropolishing is not a realistic method in view of the cost.

Method used

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  • Electrolytic solution, electrolysis case, electropolishing system, and electropolishing method using these
  • Electrolytic solution, electrolysis case, electropolishing system, and electropolishing method using these
  • Electrolytic solution, electrolysis case, electropolishing system, and electropolishing method using these

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0045]

[0046]The following electrolytic solutions are prepared.[0047](1) Electrolytic solutions (b), (c), and (f) for comparative tests, (which is referred to as a normal solution, hereinafter.)

[0048]85% phosphoric acid: 750 mL / L

[0049]98% sulfuric acid: 250 mL / L[0050](2) Electrolytic solution used to the present invention, (which is referred to a high-viscous solution, hereinafter.)

[0051]85% phosphoric acid: 750 mL / L

[0052]98% sulfuric acid: 250 mL / L

[0053]SiO2.XH2O: 200 g / L

[0054]

[0055]Test pieces, SUS 316L, (30×30×3) mm, are subjected to the following electropolishing treatment. The coating electropolishing in under-mentioned (b) and (c) is done so as to impregnate the felt or medical-resistant cloth with the electrolytic solution and pass the current between the work-piece and the cathode sandwiching the felt (cloth) between them. The treatments applying the present invention using the electrolytic case (having the distance between the work-piece and the cathode is 10 mm) are done fo...

embodiment 2

[0078]

[0079]The normal solution and the high-viscous solution are the same as the electrolytic solutions (1) and (2) in the above Embodiment 1.

[0080]

[0081]The treatments are almost same as Embodiment 1, but the voltage is set for large value in the under-mentioned (c) and (d) that correspond to the present invention. Accordingly the current increases, too. In addition, the processing time in (c) and (e) is set for three minutes.

[0082](a) The buffing only.

[0083](b) The coating electropolishing (1 minute) using the normal solution (the electrolytic solution (1)), 11V of voltage, 0.1 A / dm2 of current.

[0084](c) The coating electropolishing (3 minutes) using the normal solution (the electrolytic solution (1)), 11V of voltage, 0.1 A / dm2 of current.

[0085](d) The coating electropolishing (1 minute) using the high-viscous solution (the electrolytic solution (2)), 20V of voltage, 50 to 70 A / dm2 of current.

[0086](e) The coating electropolishing (3 minute) using the high-viscous solution (the e...

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Abstract

In an electropolishing method passing large current, an electrolytic solution is given a viscosity by reacting an organic acid (a phosphoric acid solution or a mixed solution of phosphoric acid and sulfuric acid) with a silicon dioxide as a gelling agent, the electrolytic solution is continuously introduced to an electrolysis case and concurrently the first introduced electrolytic solution is discharged to progress the electropolishing. The electrolysis case has a cathode at a specific height from a lower open end of a frame in a specific size and depth, an introduction port on the cathode for introducing the electrolytic solution with specific viscosity, and a discharge port for discharging the solution from the frame. It is possible to shorten the distance of the cathode in the electrolysis case from the open end corresponding to the work-piece surface, and control the resistant of the electrolytic solution, so that the large current can be passed and the operation time can be reduced.

Description

TECHNICAL FIELD[0001]The present invention relates to electropolishing, and in particular, electrolytic solution, electrolysis case, electropolishing system to be used to the electropolishing, and the electropolishing method.BACKGROUND ART[0002]It is the electropolishing that is frequently used as a method for removing rust and stain of metals.[0003]That is to say, the electropolishing, wherein metal (work-piece) and a cathode are immersed in an electrolytic solution keeping a specific distance from each other, and a specific current flow by applying a positive charge on the metal and a negative charge on the cathode, and then metal elements on a surface of the work-piece are dissolved, has a purpose to improve the durability of the work-piece by a modification of the metal surface. However, it is general that the work-piece before the electropolishing needs to be mechanically polished by the buffing.[0004]When the metal work is a stainless work-piece, phosphoric acid or a mixed sol...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25F7/00C25F3/16
CPCC25F7/00C25F3/16
Inventor IDA, YOSHIAKI
Owner MARUI MEKKI INDS
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