WO2013168528A1 - 黒色Cr-Co合金めっき皮膜用黒化処理液 - Google Patents
黒色Cr-Co合金めっき皮膜用黒化処理液 Download PDFInfo
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- WO2013168528A1 WO2013168528A1 PCT/JP2013/061446 JP2013061446W WO2013168528A1 WO 2013168528 A1 WO2013168528 A1 WO 2013168528A1 JP 2013061446 W JP2013061446 W JP 2013061446W WO 2013168528 A1 WO2013168528 A1 WO 2013168528A1
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/58—Treatment of other 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/42—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions only one element being applied
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
- C25D3/06—Electroplating: Baths therefor from solutions of chromium from solutions of trivalent chromium
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/04—Electrolytic coating other than with metals with inorganic materials
- C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
Definitions
- the present invention relates to a blackening treatment solution for a black Cr—Co alloy plating film and a blackening treatment method for a black Cr—Co alloy plating film.
- the black-colored film is used in various fields such as ornaments because of its good appearance, and is also used for various optical machine parts, measuring instrument parts, etc. by utilizing its low reflectivity.
- Various coatings such as chromium, nickel, zinc, aluminum, and iron are known as black coatings, and various methods such as chemical treatment and anodization are known as the formation method. ing.
- Patent Document 1 a black chrome plating method
- Patent Document 2 a black chrome plating method
- the plating baths used in these black chrome plating methods contain hexavalent chromium ions in the bath, but in recent years, the toxicity of hexavalent chromium has become a problem, such as working environment and wastewater treatment. In view of this, development of a plating solution with low toxicity is strongly desired. For this reason, black plating from a trivalent chromium bath with low toxicity is spreading as an alternative technique (see Patent Document 4, Patent Document 5, and the like below).
- the film obtained from the trivalent chrome plating bath has a black color that is weak and darker than the black plating obtained from the hexavalent chrome bath, and is more black from the point of decorativeness. A film is desired.
- the present invention has been made in view of the current state of the prior art described above, and its main purpose is to improve the blackness of a plating film with a weak blackness formed from a plating bath containing trivalent chromium.
- An object of the present invention is to provide a method capable of further improving the decorativeness.
- the present inventor has intensively studied to achieve the above-mentioned purpose.
- an acidic aqueous solution having a pH value within a range of ⁇ 1 to 5 is used for a Cr—Co alloy plating film containing a specific amount of Cr. It has been found that the blackness can be greatly improved by the treatment, and a black plating film having a good appearance can be obtained.
- the black plating film with improved blackness by this method is subjected to electrolytic chromate treatment, so that the corrosion resistance is greatly improved while maintaining a good appearance, and a black film having both excellent appearance and corrosion resistance is obtained. It has been found that it can be formed, and the present invention has been completed here.
- the present invention provides the following blackening treatment method for black Cr—Co alloy plating film and blackening treatment liquid for Cr—Co alloy plating film.
- Item 1 A black Cr—Co alloy plating film comprising a black Cr—Co alloy plating film having a Cr content of 1 to 15% by weight and a blackening solution comprising an aqueous solution having a pH value of ⁇ 1 to 5 Blackening treatment method.
- the blackening treatment method according to Item 1 which is a film.
- Item 3. The blackening treatment method according to Item 1 or 2, wherein the blackening treatment solution comprising an aqueous solution having a pH value of -1 to 5 contains hydrochloric acid and / or sulfuric acid as an acid component.
- Item 4. Item 4. The method according to any one of Items 1 to 3, wherein the method of bringing the black Cr—Co alloy plating film into contact with the blackening treatment liquid is a method of immersing an article having a black Cr—Co alloy plating film in the blackening treatment solution. the method of. Item 5.
- Item 5. The method according to any one of Items 1 to 4, wherein the black Cr—Co alloy plating film contains 5 to 15% by weight of phosphorus.
- Blackening of black Cr-Co alloy plating film characterized by performing blackening treatment of black Cr-Co alloy plating film by any one of the above items 1 to 5 and further performing electrolytic chromate treatment Processing method.
- Item 7. A blackening treatment solution for a black Cr—Co alloy plating film, comprising an aqueous solution having a pH value of ⁇ 1 to 5.
- Item 8. Item 8. The blackening solution for black Cr—Co alloy plating film according to Item 7, which contains hydrochloric acid and / or sulfuric acid as an acid component.
- Item 9 An article having a black Cr—Co alloy plating film blackened by the method of any one of the above items 1 to 6.
- a black plating film to be treated with the blackening solution of the present invention is a black Cr—Co alloy formed from a plating bath containing trivalent chromium and having a Cr content of 1 to 15% by weight. It is a plating film.
- a method for forming a black Cr—Co alloy plating film having a Cr content in the range of 1 to 15% by weight is not particularly limited. In particular, it is formed from a Cr—Co alloy plating bath that satisfies the following conditions. In addition, when the Cr—Co alloy plating film is to be processed, the blackness of the plating film can be greatly improved by performing the blackening treatment described later.
- black Cr-Co alloy plating film formed from a bath especially black Cr-Co alloy plating film with greatly improved blackness and good appearance decoration. it can.
- such a Cr—Co alloy plating bath comprises an aqueous solution containing a complexing agent, a reducing agent, a conductive salt, a pH buffering agent, etc. in addition to a compound containing a cobalt compound and trivalent chromium.
- a plating bath can be mentioned.
- the cobalt compound include cobalt sulfate, cobalt chloride, cobalt nitrate, and cobalt acetate.
- the trivalent chromium compound include chromium sulfate, chromium chloride, chromium nitrate, and chromium acetate.
- Complexing agents include monocarboxylic acids such as formic acid and acetic acid, salts thereof, dicarboxylic acids such as oxalic acid, malonic acid and maleic acid, salts thereof, hydroxycarboxylic acids such as citric acid, malic acid and glycolic acid, and salts thereof Examples thereof include inorganic acids such as organic acids such as urea, thiocyan, and cyanic acid.
- the reducing agent include hypophosphorous acid, ascorbic acid, water-soluble salts thereof (Na salt, K salt, ammonium salt, etc.), dimethylamine borane (DMAB), and the like.
- Examples of the conductive salt include sodium sulfate, potassium sulfate, ammonium sulfate, sodium chloride, potassium chloride, and ammonium chloride.
- Examples of pH buffering agents include boric acid, sodium borate, and aluminum chloride.
- the cobalt compound may be about 1 to 50 g / L
- the trivalent chromium compound may be about 5 to 500 g / L.
- the complexing agent may be, for example, about 5 to 200 g / L
- the reducing agent may be about 2 to 100 g / L
- the conductive salt is about 30 to 300 g / L.
- the pH buffering agent may be about 10 to 100 g / L.
- the plating conditions when using the above-described Cr—Co alloy plating bath there are no particular limitations on the plating conditions when using the above-described Cr—Co alloy plating bath, as long as the black Cr—Co alloy plating film having a Cr content of 1 to 15 wt% can be formed.
- the pH is about 2 to 5, preferably about 2.5 to 4, and the bath temperature is about 25 to 60 ° C., preferably about 30 to 55 ° C., about 1 to 20 A / dm 2 , preferably 5 to 15 A / dm.
- Plating may be performed at a cathode current density of about 2 .
- the formed Cr—Co alloy plating film is a film containing up to about 15% by weight of phosphorus.
- a black appearance can be obtained in a wide current density range by performing the blackening treatment described later on the Cr—Co alloy plating film containing about 5 to 15% by weight of phosphorus.
- the black Cr—Co alloy plating film having a Cr content in the range of about 1 to 15% by weight is an aqueous solution having a pH value of about ⁇ 1 to 5, preferably ⁇ 1 to 2.
- a good black appearance can be imparted without impairing the appearance of the black Cr—Co alloy plating film by contacting with a blackening treatment solution comprising an aqueous solution of about be able to.
- the pH of the blackening treatment solution is too high, the blackness of the black Cr—Co alloy plating film cannot be sufficiently improved even when the treatment is performed under the conditions described later.
- the pH value of the blackening treatment liquid is lower than the above range, not only the blackness of the black Cr—Co alloy plating film cannot be sufficiently improved, but also an uneven film appearance, so-called unevenness, is not preferable.
- the above pH value is a value measured using a commercially available pH meter at a liquid temperature of 25 ° C.
- the blackening treatment solution comprising an aqueous solution having a pH value of ⁇ 1 to 5 may be an aqueous solution within a predetermined pH range.
- the blackening solution may be adjusted to a predetermined pH range using an inorganic acid and / or an organic acid. That's fine.
- the inorganic acid include hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, hydrofluoric acid, and boric acid.
- organic acids include aliphatic monocarboxylic acids such as formic acid and acetic acid; aliphatic dicarboxylic acids such as oxalic acid, malonic acid and succinic acid; aliphatic hydroxymonocarboxylic acids such as gluconic acid; fats such as malic acid Examples thereof include aliphatic hydroxydicarboxylic acids; carboxylic acids such as aliphatic hydroxytricarboxylic acids such as citric acid. These inorganic acids and organic acids can be used singly or in combination of two or more.
- the addition amount of the inorganic acid and the organic acid is not particularly limited, and may be appropriately blended so as to be within the above-mentioned pH range. Usually, it can be about 1 to 100 g / L, and about 5 to 50 g / L. It is preferable that
- the addition amount may be adjusted using these to achieve the above pH value.
- the addition amount of 98% sulfuric acid is 5%.
- a black Cr—Co alloy plating film having a Cr content within a range of 1 to 15% by weight is treated with a pH. What is necessary is just to make it contact with the blackening process liquid which consists of aqueous solution whose value is -1-5. Thereby, the blackness can be improved without impairing the appearance of the black Cr—Co alloy plating film, and a good black appearance can be imparted.
- the black cr-Co alloy plating film can be efficiently treated by immersing an article having the black Cr-Co alloy plating film in the blackening treatment liquid. It can be carried out.
- the liquid temperature of the treatment liquid is not particularly limited, but may be, for example, about 10 to 80 ° C., preferably about 30 to 60 ° C. When the bath temperature is within this range, a good black appearance can be imparted without impairing the appearance of the plating film by performing immersion treatment under the conditions described later. On the other hand, if the bath temperature is too low, a sufficient black appearance cannot be obtained. On the other hand, when the bath temperature is too high, uneven color tone tends to occur, which is not preferable.
- the immersion treatment time when the treatment time is extremely short, sufficient blackening is not recognized. Further, if the treatment time is longer than necessary, the appearance of the film may be impaired, which is not preferable. For this reason, the immersion time is usually about 30 seconds to 20 minutes, and the immersion treatment time is preferably about 1 minute to 10 minutes.
- the Cr-Co alloy plating film that has been blackened by the above-described method is subsequently subjected to electrolytic chromate treatment, so that blackening treatment can be performed without deteriorating a good black appearance.
- the corrosion resistance of the applied Cr—Co alloy plating film can be greatly improved.
- blackening treatment is performed using a blackening treatment solution having a pH of about ⁇ 0.5 to 1, a blackened film having high corrosion resistance can be obtained by performing electrolytic chromate treatment.
- the specific conditions for the electrolytic chromate treatment are not particularly limited, and the electrolytic treatment may be performed using a known electrolytic chromate solution within a range that does not impair a good black appearance.
- an aqueous solution containing a chromium compound such as chromic acid, anhydrous chromic acid, sodium dichromate, potassium dichromate, and the like, and adding sulfuric acid or the like as necessary may be mentioned.
- the chromium concentration in the treatment solution may be, for example, about 2.5 to 50 g / L, the pH value is about 1.0 to 5.5, the treatment temperature is about 20 to 70 ° C., and the cathode current density is about 0.1 to 2 A / dm 2.
- the electrolytic treatment may be performed for about 10 seconds to 5 minutes.
- the anode is not particularly limited, but for example, Pb, Pb—Sn alloy or the like can be used.
- the blackening treatment liquid used in the blackening treatment method of the present invention is a treatment liquid that does not contain a hexavalent chromium compound, and the black Cr—Co alloy plating film to be treated also does not contain a hexavalent chromium compound. It is formed from a liquid.
- a plating film having a good black appearance can be formed without using an environmentally hazardous substance such as hexavalent chromium.
- the black plating film to be formed is a plating film having a good black appearance and excellent decorativeness. Furthermore, since it is a low reflectance film, it can be effectively used for various applications.
- the corrosion resistance can be greatly improved without impairing a good black appearance. As a result, it can be effectively used for various applications as a black film having good appearance and corrosion resistance.
- Example 1 A brass plate on which a bright nickel plating film having a thickness of 5 ⁇ m was formed was used as a test piece, and a black Cr—Co alloy plating film was formed using each Cr—Co alloy plating solution having the composition described in Table 1 below.
- the reflectance of the formed Cr—Co alloy plating film was measured with a color difference meter.
- the reflectance was measured in the wavelength range of 400 to 700 nm.
- the measurement result of the reflectance shows the minimum and maximum ranges of the reflectance in the wavelength range of 400 to 700 nm.
- the blackening treatment was performed by immersing in each blackening treatment liquid having the composition described in Table 1.
- the processing conditions are as shown in Table 1 below.
- NaOH was used in order to increase the pH of the blackening treatment solution.
- Example 2 Using a brass plate with a bright nickel plating film with a thickness of 5 ⁇ m as a test piece, 40% chromium sulfate 184ml / L, potassium sulfate 140g / L, cobalt sulfate 14.3g / L, boric acid 40g / L, hypophosphorous acid Na10g Using a Cr-Co alloy plating bath consisting of an aqueous solution of pH 3.5 containing L / L, plating was performed for 10 minutes under the conditions of a bath temperature of 50 ° C. and a cathode current density of 10 A / dm 2 . A black Cr-Co alloy plating film was formed. The obtained Cr—Co alloy plating film contained Co: about 80 wt% Cr: about 2 wt% P: about 7 wt%, O: about 7 wt%, C: about 4 wt%.
- an aqueous solution containing 10 g / L of malic acid and whose pH value was adjusted with sulfuric acid was used as a blackening treatment solution, and a sample on which a Cr—Co alloy plating film was formed was placed in a treatment solution at a liquid temperature of 50 ° C. Blackening treatment was performed by dipping for a minute.
- Each sample subjected to blackening treatment was subjected to electrolytic chromate treatment using a commercially available electrolytic chromate treatment solution (trade name: ECB-Y, manufactured by Okuno Pharmaceutical Co., Ltd.).
- the main component of the electrolytic chromate treatment solution used was sodium dichromate, and the treatment conditions were ECB-Y 100 ml / L solution (chromium concentration 0.7 g / L), treatment solution pH 3.5, bath temperature: 25 ° C ( RT), cathode current density: 0.5 A / dm 2 , and processing time was 1 minute.
- each sample was subjected to a corrosion resistance test (CASS test) according to JIS H8502 using a CASS tester for 24 hours, and each sample after the test was rated according to the rating number (RN) based on the total corrosion area ratio.
- the corrosion resistance was evaluated.
- a sample having no rust generation on the entire surface is designated as a rating number (RN) 10, and the smaller the rating number (RN), the higher the corrosion area ratio.
- the results are shown in Table 2 below.
- Example 3 For a sample on which a Cr—Co alloy plating film was formed by the same method as in Example 2, an aqueous solution containing 35% hydrochloric acid at 200 mL / L and having a pH value of ⁇ 0.1 was used as the blackening treatment liquid, and the liquid temperature was 20 ° C. As a result, the blackening treatment was performed by changing the treatment time between 2 and 10 minutes.
- Example 2 After the electrolytic chromate treatment was performed under the same conditions as in Example 2, the film appearance and corrosion resistance were evaluated in the same manner as in Example 2. The results are shown in Table 3 below.
- the corrosion resistance of the film after the electrolytic chromate treatment was particularly good when the blackening treatment time was in the range of 4 to 6 minutes.
- Example 4 For a sample on which a Cr—Co alloy plating film was formed in the same manner as in Example 2, a blackening treatment liquid having a pH value adjusted to a range of ⁇ 0.32 to 0.45 with 98% sulfuric acid was used, and the liquid temperature was 40 ° C. The blackening treatment was performed while changing the treatment time between 3.5 and 8 minutes.
- Example 2 After the electrolytic chromate treatment was performed under the same conditions as in Example 2, the film appearance and corrosion resistance were evaluated in the same manner as in Example 2. The results are shown in Table 4 below.
- Example 5 A sample on which a Cr—Co alloy plating film was formed in the same manner as in Example 2 was immersed in a blackening treatment solution consisting of an aqueous solution with a pH value of 0 containing 50 mL / L of 98% sulfuric acid at a liquid temperature of 40 ° C. for 5 minutes. Then, the blackening process was performed.
- a blackening treatment solution consisting of an aqueous solution with a pH value of 0 containing 50 mL / L of 98% sulfuric acid at a liquid temperature of 40 ° C. for 5 minutes. Then, the blackening process was performed.
- Example 2 using the same electrolytic chromate treatment solution as in Example 2, the electrolytic chromate treatment was performed at a cathode current density of 0.5 A / dm 2 and a liquid temperature of 25 ° C. with an electrolytic chromate treatment time of 10 seconds to 3 minutes.
- the film appearance and corrosion resistance were evaluated in the same manner as in Example 2. The results are shown in Table 5 below.
- Example 5 particularly good corrosion resistance could be imparted under the treatment conditions in Example 5 when the electrolytic chromate treatment time ranged from 1 to 2 minutes.
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Abstract
Description
項1. Cr含有率が1~15重量%の黒色Cr-Co合金めっき皮膜を、pH値が-1~5の水溶液からなる黒化処理液に接触させることを特徴とする、黒色Cr-Co合金めっき皮膜の黒化処理方法。
項2. 黒色Cr-Co合金めっき皮膜が、コバルト化合物と3価クロムを含む化合物を、Cr/Co(重量比)=2~60の比率で含有するCr-Co合金めっき浴から電気めっき法によって形成された皮膜である、上記項1に記載の黒化処理方法。
項3. pH値が-1~5の水溶液からなる黒化処理液が、酸成分として、塩酸及び/又は硫酸を含有するものである、上記項1又は2に記載の黒化処理方法。
項4. 黒色Cr-Co合金めっき皮膜を黒化処理液に接触させる方法が、黒色Cr-Co合金めっき皮膜を有する物品を黒化処理液に浸漬する方法である、上記項1~3のいずれかに記載の方法。
項5. 黒色Cr-Co合金めっき皮膜が、リンを5~15重量%含有するものである、上記項1~4のいずれかに記載の方法。
項6. 上記項1~5のいずれかの方法で黒色Cr-Co合金めっき皮膜の黒化処理を行った後、更に、電解クロメート処理を行うことを特徴とする、黒色Cr-Co合金めっき皮膜の黒化処理方法。
項7. pH値が-1~5の水溶液からなる、黒色Cr-Co合金めっき皮膜用黒化処理液。
項8. 酸成分として、塩酸及び/又は硫酸を含有する上記項7に記載の黒色Cr-Co合金めっき皮膜用黒化処理液。
項9. 上記項1~6のいずれかの方法で黒化処理された黒色Cr-Co合金めっき皮膜を有する物品。
本発明の黒化処理液の処理対象となる黒色めっき皮膜は、3価クロムを含むめっき浴から形成された、Cr含有率が1~15重量%の範囲内の黒色Cr-Co合金めっき皮膜である。
本発明では、上記したCr含有率が1~15重量%程度の範囲内の黒色Cr-Co合金めっき皮膜を、pH値が-1~5程度の水溶液、好ましくは-1~2程度の水溶液、より好ましくは-0.5~1程度の水溶液からなる黒化処理液に接触させることによって、黒色Cr-Co合金めっき皮膜の外観を損なうことなく、良好な黒味外観を付与することができる。黒化処理液のpHが高すぎる場合には、後述する条件で処理を行った場合であっても黒色Cr-Co合金めっき皮膜の黒味を十分に向上させることができない。一方、黒化処理液のpH値が上記範囲より下回ると、黒色Cr-Co合金めっき皮膜の黒味を十分に向上させることができないばかりか、不均一な皮膜外観、いわゆるムラを示すので好ましくない。尚、上記したpH値は、25℃の液温において市販のpHメーターを用いて測定した値である。
本発明では、上記した方法によって黒化処理を施したCr-Co合金めっき皮膜に対して、引き続き電解クロメート処理を行うことによって、良好な黒色外観を低下させることなく、黒化処理を施したCr-Co合金めっき皮膜の耐食性を大きく向上させることができる。特に、pHが-0.5~1程度の黒化処理液を用いて黒化処理を行った場合には、電解クロメート処理を行うことによって、耐食性の高い黒化皮膜とすることができる。
膜厚5μmの光沢ニッケルめっき皮膜を形成した真鍮板を試験片とし、下記表1に記載した組成を有する各Cr-Co合金めっき液を用いて黒色Cr-Co合金めっき皮膜を形成した。
膜厚5μmの光沢ニッケルめっき皮膜を形成した真鍮板を試験片として、40%硫酸クロム184ml/L、硫酸カリウム140g/L、硫酸コバルト14.3g/L、ホウ酸40g/L、次亜リン酸Na10g/Lを含有するpH3.5の水溶液からなるCr-Co合金めっき浴を用いて、浴温50℃、陰極電流密度10A/dm2の条件で10分間めっき処理を行い、膜厚約1.0μmの黒色Cr-Co合金めっき皮膜を形成した。得られたCr-Co合金めっき皮膜は、Co : 約80 wt% Cr : 約2 wt% P : 約7 wt%、O:約7wt%、C:約4wt%を含有するものであった。
実施例2と同様の方法でCr-Co合金めっき皮膜を形成した試料について、35%塩酸を200mL/L含有するpH値が-0.1の水溶液を黒化処理液として用いて、液温を20℃として、処理時間を2~10分の間で変化させて黒化処理を行った。
実施例2と同様の方法でCr-Co合金めっき皮膜を形成した試料について、98%硫酸を用いてpH値を-0.32~0.45の範囲に調整した黒化処理液を用い、液温を40℃とし、処理時間を3.5~8分の間で変化させて黒化処理を行った。
実施例2と同様の方法でCr-Co合金めっき皮膜を形成した試料を、98%硫酸を50mL/L含有するpH値0の水溶液からなる黒化処理液に、液温40℃で5分間浸漬して黒化処理を行った。
Claims (9)
- Cr含有率が1~15重量%の黒色Cr-Co合金めっき皮膜を、pH値が-1~5の水溶液からなる黒化処理液に接触させることを特徴とする、黒色Cr-Co合金めっき皮膜の黒化処理方法。
- 黒色Cr-Co合金めっき皮膜が、コバルト化合物と3価クロムを含む化合物を、Cr/Co(重量比)=2~60の比率で含有するCr-Co合金めっき浴から電気めっき法によって形成された皮膜である、請求項1に記載の黒化処理方法。
- pH値が-1~5の水溶液からなる黒化処理液が、酸成分として、塩酸及び/又は硫酸を含有するものである、請求項1又は2に記載の黒化処理方法。
- 黒色Cr-Co合金めっき皮膜を黒化処理液に接触させる方法が、黒色Cr-Co合金めっき皮膜を有する物品を黒化処理液に浸漬する方法である、請求項1~3のいずれかに記載の方法。
- 黒色Cr-Co合金めっき皮膜が、リンを5~15重量%含有するものである、請求項1~4のいずれかに記載の方法。
- 請求項1~5のいずれかの方法で黒色Cr-Co合金めっき皮膜の黒化処理を行った後、更に、電解クロメート処理を行うことを特徴とする、黒色Cr-Co合金めっき皮膜の黒化処理方法。
- pH値が-1~5の水溶液からなる、黒色Cr-Co合金めっき皮膜用黒化処理液。
- 酸成分として、塩酸及び/又は硫酸を含有する請求項7に記載の黒色Cr-Co合金めっき皮膜用黒化処理液。
- 請求項1~6のいずれかの方法で黒化処理された黒色Cr-Co合金めっき皮膜を有する物品。
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US14/395,091 US9920416B2 (en) | 2012-05-09 | 2013-04-18 | Blackening treatment solution for black Cr—Co alloy plating film |
KR1020147031256A KR101692262B1 (ko) | 2012-05-09 | 2013-04-18 | 흑색 Cr-Co 합금 도금 피막용 흑화 처리액 |
CN201380022278.2A CN104254642B (zh) | 2012-05-09 | 2013-04-18 | 用于黑色Cr‑Co合金镀膜的黑化处理溶液 |
JP2014514423A JP5867761B2 (ja) | 2012-05-09 | 2013-04-18 | 黒色Cr−Co合金めっき皮膜用黒化処理液 |
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