KR101620788B1 - Surface treated electrode for electrolytic cleaning line and manufacturing method thereof - Google Patents
Surface treated electrode for electrolytic cleaning line and manufacturing method thereof Download PDFInfo
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- KR101620788B1 KR101620788B1 KR1020150089660A KR20150089660A KR101620788B1 KR 101620788 B1 KR101620788 B1 KR 101620788B1 KR 1020150089660 A KR1020150089660 A KR 1020150089660A KR 20150089660 A KR20150089660 A KR 20150089660A KR 101620788 B1 KR101620788 B1 KR 101620788B1
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- iro
- iridium oxide
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- electrode substrate
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
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- Electrodes For Compound Or Non-Metal Manufacture (AREA)
Abstract
The present invention relates to an electrode of an electrolytic cleaning facility (ECL) for improving the surface cleanliness of a coated steel sheet or the like.
Description
The present invention relates to an electrode of an electrolytic cleaner (ECL) for improving the surface cleanliness of a cold-rolled steel sheet, a coated steel sheet and the like, and a method for producing the same.
Cold rolled steel sheets and coated steel sheets (for example, galvanized steel sheets) largely depend on the cleanliness of the surface of the material. For this purpose, a method of degreasing the cold rolled steel sheet and the coated steel sheet is used physically and chemically.
Particularly, degreasing by an electrochemical method is a method of improving surface cleanliness by generating hydrogen and oxygen on the surface of a material, and is generally performed by passing through an electrolytic cleaning line during a process of manufacturing a cold-rolled steel sheet or a coated steel sheet to be.
Electrolytic cleaning is a process in which a cathode plate and a grid of a cathode plate are immersed in a strong alkaline solution to generate hydrogen and oxygen gas on the surface of the workpiece, thereby degreasing the organic substances (oil, etc.) and foreign substances existing on the workpiece surface.
The generated voltage of oxygen and hydrogen on the surface of the material is influenced by the concentration and the temperature of the solution, and the cleanliness of the material depends on the deposition voltage of hydrogen and oxygen in the anode and the cathode.
That is, the electrolytic cleanliness by the above-described electrochemical method is proportional to the amount and intensity of hydrogen and oxygen generated on the surface of the material. In particular, the lower the precipitation voltage of hydrogen and oxygen, the higher the electrolytic cleanliness.
On the other hand, a Fe sheet is used as an electrode material to date. However, when the anode and the cathode are applied, some Fe may be molten and contaminate the solution. As shown below, There is a problem that the surface of the surface of the sphere can not be sufficiently cleaned because the amount of the generated sludge is small.
CATHOD: 2H + + 2e - → H 2 , voltage: (before processing) 0V → (after processing) 0V
ANODE: 2OH - → ½O 2 + H 2 O + 2e - , voltage: 1.24V before treatment (after treatment) 0.94V after treatment
Accordingly, there is a need for a method for increasing the amount of hydrogen and oxygen generated on the surface of the material during electrolytic cleaning through an electrochemical method, in particular, a method for lowering the deposition voltage of oxygen.
One aspect of the present invention relates to an electrolytic cleaner (ECL) electrode capable of improving the cleaning ability of the cold-rolled steel sheet or the coated steel sheet when the electrolytic solution is cleaned. More particularly, And a method for producing the same.
One aspect of the present invention provides a surface-treated electrode for an electrolytic cleaner, which comprises an electrode substrate and an iridium oxide (IrO 2 ) layer on one surface of the electrode substrate.
According to another aspect of the present invention, there is provided a method of manufacturing an electrode substrate, A second step of pretreating the surface of the electrode substrate; A third step of coating an iridium oxide (IrO 2) on one surface of the pre-treated electrode substrate, And a fourth step of drying and heat-treating the coated electrode substrate,
And the third step and the fourth step are repeated. The present invention also provides a method for producing a surface-treated electrode for an electrolytic cleaner.
According to the present invention, when the surface of a material (for example, a cold-rolled steel sheet, a coated steel sheet, or the like) is cleaned from an electrolytic cleaner, the precipitation voltage of oxygen generated from the electrode is effectively lowered, There is an effect of improving the effect.
1 is a side view of a surface-treated electrode for an electrolytic cleaner according to an embodiment of the present invention.
2 is a front view of a surface-treated electrode for an electrolytic cleaner according to an embodiment of the present invention.
FIG. 3 is a graph showing the results of measurement of the oxygen precipitation voltage with respect to time when electrolytic cleaning is performed using electrodes (Examples 1 to 3) for surface-treated electrolytic cleaning equipment according to an embodiment of the present invention and conventional electrodes .
As a result of intensive studies on increasing the amount of hydrogen and oxygen generated on the surface of the material during electrolytic cleaning through electrochemical methods, the present inventors have found that when the deposition voltage of oxygen is lowered, the material surface can be sufficiently cleaned, It was confirmed that it is possible to prevent contamination.
Accordingly, the present invention provides a method of lowering the deposition voltage of oxygen generated in an electrode during electrolytic cleaning of a material.
More particularly, the present invention relates to an electrode for an electrolytic cleaner (ECL) capable of improving the cleaning ability of a material, particularly, a cold-rolled steel sheet or a coated steel sheet in electrolytic cleaning, It is significant to provide a treated electrode.
Hereinafter, the present invention will be described in more detail.
The electrode for surface-treated electrolytic cleaner according to one aspect of the present invention preferably includes an electrode substrate and an iridium oxide (IrO 2 ) layer on one surface of the electrode substrate (see FIG. 1).
At this time, a metal substrate may be used as the electrode substrate, and a Ti substrate, an Fe substrate, or the like may be used.
The iridium oxide (IrO 2 ) layer formed on one surface of the electrode substrate may have an average thickness of 11 to 13 μm.
The difficult and iridium oxide (IrO 2) the thickness of the electrolyte layer is less than 11㎛ lower precipitation voltage of the hydrogen in the electrode clean effectively, there is a severe problem is the prolonged use of iridium oxide (IrO 2) layer deteriorates. Therefore, it is preferable that the iridium oxide (IrO 2 ) layer has an average thickness of 11 μm or more, but if it is too thick, not only the coating cost increases, but also the thickness of the iridium oxide Mu m.
Meanwhile, the electrode of the present invention including the iridium oxide layer preferably includes a hole through which the solution can move. At this time, the holes may be formed in a row at regular intervals, and the fluidity of the solution can be sufficiently improved.
In particular, it is preferred that the electrodes of the present invention include a cylindrical bar between one row of holes and the other row of holes (see FIG. 2). This is to prevent the grid surface from being damaged when the strip and the electrode grid are directly closed when the strip passes through the electrode. In the present invention, the cylindrical bar is provided so as to protrude from the electrode grid , The material strip and the electrode grid can be prevented from being directly closed, thereby preventing damage to the grid.
It is preferable that the cylindrical bar has a diameter of 30 to 40 mm and a height of 30 to 40 mm and is made of a PVC material.
Also, the holes may be formed to have a diameter of 20 to 30 mm, and the spacing between the holes may be maintained at 230 to 270 mm.
An advantageous method of manufacturing the surface-treated electrolytic cleaning equipment electrode of the present invention is not particularly limited as long as it is a method capable of forming an iridium oxide (IrO 2 ) layer on one surface of the electrode substrate. In the present invention, It proposes a preferred process that can be uniformly formed to a thickness desired for an iridium oxide (IrO 2) layer.
As a preferred example for producing the electrode for surface-treated electrolytic cleaner of the present invention, a first step of preparing an electrode substrate; A second step of pretreating the surface of the electrode substrate; A third step of coating iridium oxide (IrO 2 ) on one surface of the pretreated electrode substrate; And a fourth step of drying and heat-treating the coated electrode substrate to produce a surface-treated electrode for an electrolytic cleaner.
The second step of pretreating the surface of the electrode substrate is a step for forming fine irregularities on the electrode substrate. The fine irregularities may be formed by immersing the electrode substrate in an acid, have.
At this time, sulfuric acid, hydrochloric acid, or the like can be used as the acid solution, and the heating temperature is preferably set to 40 to 60 ° C.
It is preferable that iridium oxide (IrO 2 ) is coated on the electrode substrate that has been pretreated as described above, and it is preferable to coat the surface with fine irregularities.
The coating may be performed by applying the iridium oxide (IrO 2 ), and preferably the composition prepared by mixing the resin component and the IrO 2 powder may be coated through a painting process.
More specifically, it is preferable that the composition contains 2 to 10% of iridium oxide (IrO 2 ) based on the solid content in the resin component. When the solid content of the iridium oxide satisfies 2 to 10%, an intended oxygen precipitation voltage can be effectively lowered.
As the resin component, it is preferable to use at least one resin selected from the group consisting of epoxy, ester, urethane and acrylic.
When the coating of the iridium oxide is completed, the coated electrode substrate is preferably dried and heat-treated.
The drying and heat treatment may be performed at 150 to 250 ° C. for 5 to 10 minutes, more preferably at 150 ° C. or more, so as to form a uniform and close iridium oxide (IrO 2 ) layer . If the temperature of the drying and heat treatment process is less than 150 ° C or less than 5 minutes, the oxide layer may not be sufficiently dried and a non-uniform oxide layer may be formed. On the other hand, if the temperature exceeds 250 ° C or exceeds 10 minutes There is a risk that the drying and heat treatment processes become excessive and the oxide layer is damaged.
The drying and heat treatment may be performed by a method generally known in the art. For example, a hot air heating method, an infrared heating method, an induction heating method, or the like may be used.
In the present invention, the iridium oxide (IrO 2 ) layer can be formed to a desired thickness by repeating the step of coating the iridium oxide (the third step) and the step of drying and heat-treating it (the fourth step).
As an example, when repeating 5 to 50 times, a target iridium oxide (IrO 2 ) layer having an average thickness of 11 to 13 μm can be formed. More preferably, it is advantageous to be repeated more than 17 times to form a thick uniform iridium oxide (IrO 2) layer.
By repeating the coating process, the drying process and the heat treatment process, it is possible to prevent the peeling of the iridium oxide (IrO 2 ) layer and to secure an oxide layer having a uniform thickness.
As described above, the electrode for surface-treated electrolytic cleaner manufactured by the method proposed by the present invention can improve the cleanliness of the surface of a material (for example, a plated steel sheet, etc.) It is effective.
Hereinafter, the present invention will be described more specifically by way of examples. It should be noted, however, that the following examples are intended to illustrate the present invention by way of illustration and not to limit the scope of the present invention. The scope of the present invention is determined by the matters set forth in the claims and the matters reasonably inferred therefrom.
( Example )
Example One. Electrolytic cleaning equipment Electrode preparation
A titanium substrate was prepared and then the titanium substrate was subjected to a pretreatment process in which the titanium substrate was heated to 40 to 60 캜 in a sulfuric acid solution of 5 to 15 wt% to form fine irregularities on the surface thereof.
Then, iridium oxide (IrO 2 ) was coated on the surface of the substrate having the irregularities. At this time, a composition in which iridium oxide (IrO 2 ) was added to the epoxy resin in a solid content as shown in Table 1 was painted. At this time, the remainder was water.
Thereafter, the coated substrate was dried and heat-treated at a temperature shown in Table 1 for 2 to 15 minutes to form an iridium oxide (IrO 2 ) layer. At this time, the coating process, the drying process and the heat treatment process were repeated 45 times to form an iridium oxide (IrO 2 ) layer.
Solid content (%)
Temperature (℃)
Example 1
Example 2
Example 3
(The comparative example in Table 1 corresponds to the case where iridium oxide coating is not performed).
Example 2. Oxygen Precipitation partial pressure Measure
Electrolytic cleaning of the galvanized steel sheets was performed using the respective electrodes prepared in Example 1 above. At this time, the cell voltage was measured, and the result is shown in Fig.
As shown in FIG. 3, in the case of using an electrode coated with an iridium oxide (IrO 2 ) layer, a cell voltage of about 80 V was measured during the progress of electrolytic cleaning, whereas in the comparative example in which no coating treatment was performed, It can be confirmed that the voltage is measured at 60 V or less.
The reason why the cell voltage was greatly increased in the case of using the electrode coated with iridium oxide (IrO 2 ) as compared with the comparative example is that the deposition voltage of the oxygen is effectively lowered during the electrolytic cleaning owing to the coating of the iridium oxide (IrO 2 ) The cleaning effect of the material surface can be improved.
On the other hand, the surface of the iridium oxide (IrO 2 ) layer after electrolytic cleaning was observed with naked eyes for the example in which the iridium oxide was contained in an amount of 7% based on the solid content. As a result, On the other hand, in Examples 2 and 3 in which drying and heat treatment were performed at 200 ° C and 250 ° C, respectively, the surface was peeled off, a good surface was observed even after electrolytic cleaning.
In view of this, in the present invention, although the oxygen precipitation voltage can be lowered even when the drying and heat treatment are performed at 150 ° C., it is carried out at a temperature exceeding 150 ° C. in order to secure a good quality coating layer even after electrolytic cleaning. .
Claims (10)
Wherein the iridium oxide layer is formed using a composition comprising iridium oxide (IrO 2 ) in an amount of 2 to 10% based on solids in at least one resin component of epoxy, ester, urethane and acrylic. Electrodes for clean installations.
The electrode substrate is a metal substrate, and is a titanium substrate (Ti sheet) or an iron substrate (Fe sheet).
The iridium oxide (IrO 2) layer is an electrode for electrolytic cleaning equipment would have an average thickness of 11 ~ 13㎛ surface treatment.
Wherein said electrode comprises a row of holes through which a solution can be transferred and a cylindrical bar between said row of holes and another row of holes.
Wherein the hole has a diameter of 20 to 30 mm and the interval between the holes is 230 to 270 mm and the cylindrical bar has a diameter of 30 to 40 mm and a height of 30 to 40 mm, Electrodes for clean installations.
A second step of pretreating the surface of the electrode substrate;
A third step of coating iridium oxide (IrO 2 ) on one surface of the pretreated electrode substrate; And
And a fourth step of drying and heat-treating the coated electrode substrate,
Wherein the fourth step is carried out at 150 to 250 ° C for 5 to 10 minutes, and the third step and the fourth step are repeated.
The third step of coating the iridium oxide (IrO 2 ) is a method of painting a composition comprising iridium oxide (IrO 2 ) powder mixed with a resin component.
Wherein the composition comprises iridium oxide (IrO 2 ) in an amount of 2 to 10% based on the solid content in at least one resin component of epoxy, ester, urethane and acrylic.
Wherein the surface of the electrode substrate after the second step has fine irregularities formed on the surface thereof.
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| KR1020150089660A KR101620788B1 (en) | 2015-06-24 | 2015-06-24 | Surface treated electrode for electrolytic cleaning line and manufacturing method thereof |
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| KR1020150089660A KR101620788B1 (en) | 2015-06-24 | 2015-06-24 | Surface treated electrode for electrolytic cleaning line and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101390654B1 (en) * | 2012-10-10 | 2014-05-07 | 인하대학교 산학협력단 | Fabrication Method of Mixed Metal Oxide Electrode for Alkaline Water Electrolysis System |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101390654B1 (en) * | 2012-10-10 | 2014-05-07 | 인하대학교 산학협력단 | Fabrication Method of Mixed Metal Oxide Electrode for Alkaline Water Electrolysis System |
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