CN1267748A - Cathode electrolysis process for coloring copper surface - Google Patents
Cathode electrolysis process for coloring copper surface Download PDFInfo
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- CN1267748A CN1267748A CN 99102627 CN99102627A CN1267748A CN 1267748 A CN1267748 A CN 1267748A CN 99102627 CN99102627 CN 99102627 CN 99102627 A CN99102627 A CN 99102627A CN 1267748 A CN1267748 A CN 1267748A
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- coloring
- coloring liquid
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- citric acid
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Abstract
The present invention belongs to the field of chemistry, and the technological process may be used to form various bright colors, orange red, purple, golden yellow, violet, greenish black, etc. on dense, homogeneous and bright copper layer. The coloring liquid consists of basic copper carbonate 10-40 g/l, citric acid 40-180 g/l and potassium hydroxide 50-200 g/l, and the coloring conditions include coloring liquid temperature of 15-40 deg.c, pH value 12-14 and cathode current density of 5-50 mA/sq dm. The coloring liquid is non-toxic and stable in property and can form fast color layer.
Description
The present invention relates to electrochemical field, especially relate to cathode electrolysis process for coloring on a kind of bright copper layers and (be called for short: NCEC5).
The copper surface colour can improve outward appearance, obtains simulating golden colour and other pleasing color.Can produce the look film on the copper surface or disturb film with colorize method, this film very thin (only tens of millimicron), sometimes disturb film self almost not have color, and when the copper surface with the film surface luminous reflectance took place, light wave was offset mutually outside mutually, form various different colors, when the thickness of film increased gradually, tone changed thereupon, generally occurred a series of colors such as red, yellow, blue, green successively, if during film in uneven thickness, iris will be produced or piebald is variegated.Painted for copper, relevant books put down in writing more chemical method (" the process of surface treatment handbook, Science and Technology of Shanghai press, in January, 1991 first version), dull with the color that this method obtains, the concentration of solution is difficult to be controlled.In recent years, there is data to report katholysis, can produce multiple color (Wang Quanfa on the copper surface, " electrolytic coloring of copper ", " electroplating and environmental protection ", 1988,10 (5) 10) adopt copper sulfate, lactic acid, Trisodium Citrate, sodium hydroxide etc. in its prescription, sediment is more behind its solution life-time service, and performance is unstable, and operating restraint is narrower.
The objective of the invention is to develop a kind of solution component still less, performance is more stable, and operating restraint is wideer, and abundanter, the more gorgeous copper cathode of surface of the color category of acquisition is separated painted novel process (being called for short NCEC5).
Content of the present invention comprises prescription, preparation and working specification and the coloring effect of coloring liquid, and particular content is as follows:
1. the prescription of coloring liquid: ventilation breather 10～40 grams per liters, citric acid 40～180 grams per liters, potassium hydroxide 50～200 grams per liters.
2. the compound method of coloring liquid:
(1) water with 1/2 volume dissolves citric acid, adds KOH pH value is transferred to about 3～4;
(2), and under constantly stirring, slowly pour in the groove with ventilation breather water furnishing pasty state.Have great amount of carbon dioxide gas to separate out this moment, is strictly on guard against and overflows;
(3) under agitation add KOH, make the pH value coarse adjustment to desirable value, the dilution tank liquor is to volume required;
(4) regulating pH value with citric acid or potassium hydroxide strong solution can try out to desirable value.
3. working specification: PH 12～14,15～40 ℃ of coloring liquid temperature, 5～50 milliamperes/square decimeter of cathode current densities.
4. coloring effect: in the operating procedure scope, can successively occur orange red, brick red, purplish red, yellowish, golden yellow, violet, multiple color such as blackish green over time on the copper surface.When PH hangs down, be beneficial to violet, dark-coloured appearance such as blackish green; When PH is high, be beneficial to the appearance of light tones such as red, Huang.The coloring liquid temperature is higher, when the concentration of cathode current density and coloring liquid is big, painted speed is very fast, otherwise then slower.As long as electrically contact well, copper surface compact, even, bright, not passivation can obtain even, gorgeous color.
In order to make technology of the present invention be easier to control, use the galvanic current source, milliampere meter is adopted in the electric current indication.Electric current distribution should be evenly, stable, the temperature requirement uniformity of coloring liquid is to guarantee the workpiece uniform coloring.When the liquid temperature was higher, current density should be hanged down; When the liquid temperature was low, current density was suitable high, made painted speed be easy to control.
Coloring liquid of the present invention is nontoxic, and to compare composition less with similar coloring liquid, and sediment is less behind the life-time service, and performance is more stable, and is painted gorgeous.The fast light photograph of pigmented layer, behind for example golden yellow chromatograph cover clear lacquer in indoor storage nondiscoloration in 10 years.
The prescription of embodiment 1 coloring liquid is: ventilation breather 15 grams per liters, citric acid 80 grams per liters, potassium hydroxide 86 grams per liters; The temperature of coloring liquid is 18 ℃, and PH is about 12, and cathode current density is 50 milliamperes/square decimeter, and during 1 minute painted time, the copper surface is orange red; In the time of 2 minutes, be red-purple; In the time of 3 minutes, be golden yellow; In the time of 4 minutes, for blackish green.
The prescription of embodiment 2 coloring liquids is: ventilation breather 20 grams per liters, citric acid 94 grams per liters, potassium hydroxide 100 grams per liters; The temperature of coloring liquid is 15 ℃, and PH is about 13, and cathode current density is 20 milliamperes/square decimeter, and during 1 minute painted time, the copper surface is orange red; In the time of 2 minutes, for brick-red; In the time of 3 minutes, be red-purple; In the time of 4 to 5 minutes, be the copper red look; In the time of 6 minutes, be light golden rod yellow; In the time of 7 minutes, be golden yellow; In the time of 8 minutes, be dark golden yellow.
Claims (3)
1. a cathode electrolysis process for coloring copper surface (is called for short: NCEC5), comprise the prescription of coloring liquid, the preparation of coloring liquid and the working specification of coloring process etc., it is characterized in that: the prescription of coloring liquid is, ventilation breather 10～40 grams per liters, citric acid 40～180 grams per liters, potassium hydroxide 50～200 grams per liters.
2. cathode electrolysis process for coloring copper surface as claimed in claim 1 is characterized in that: the compound method of described coloring liquid is that dissolve citric acid with the water of 1/2 volume (1), adds KOH pH value is transferred to about 3～4; (2), and under constantly stirring, slowly pour in the groove with ventilation breather water furnishing pasty state; (3) under agitation add KOH, make the pH value coarse adjustment to desirable value, the dilution tank liquor is to volume required; (4) regulating pH value with citric acid or potassium hydroxide strong solution can try out to desirable value.
3. cathode electrolysis process for coloring copper surface as claimed in claim 1 is characterized in that: the working specification of described coloring process is PH12～14,15～40 ℃ of coloring liquid temperature, 5～50 milliamperes/square decimeter of cathode current densities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99102627 CN1267748A (en) | 1999-03-18 | 1999-03-18 | Cathode electrolysis process for coloring copper surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99102627 CN1267748A (en) | 1999-03-18 | 1999-03-18 | Cathode electrolysis process for coloring copper surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1267748A true CN1267748A (en) | 2000-09-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99102627 Pending CN1267748A (en) | 1999-03-18 | 1999-03-18 | Cathode electrolysis process for coloring copper surface |
Country Status (1)
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| CN (1) | CN1267748A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086999A (en) * | 2016-08-31 | 2016-11-09 | 山东豪门铝业有限公司 | A kind of ability cathode electrophoresis double-colored bronze wire drawing element aluminium section bar preparation technology |
| CN111074258A (en) * | 2019-12-30 | 2020-04-28 | 河北师范大学 | Method for blackening copper foil and recovering primary color at room temperature |
-
1999
- 1999-03-18 CN CN 99102627 patent/CN1267748A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086999A (en) * | 2016-08-31 | 2016-11-09 | 山东豪门铝业有限公司 | A kind of ability cathode electrophoresis double-colored bronze wire drawing element aluminium section bar preparation technology |
| CN111074258A (en) * | 2019-12-30 | 2020-04-28 | 河北师范大学 | Method for blackening copper foil and recovering primary color at room temperature |
| CN111074258B (en) * | 2019-12-30 | 2021-09-14 | 河北师范大学 | Method for blackening copper foil and recovering primary color at room temperature |
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