Classifications

• • 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
  • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
• • 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
  • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
  • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
  • C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
• • 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
  • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
  • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
  • C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
  • C23C28/025—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only with at least one zinc-based layer
• • 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
  • C25D5/10—Electroplating with more than one layer of the same or of different metals

Definitions

• This invention relates to a veneer plate having excellent appearance when used for application of cation electrodeposition coating, in particular, to a vehicle body member.
• Fe plating is softer than Fe-Zn alloy plating, so no cracking occurs even when the plated steel is processed into a member, and the coating film does not appear. There are few craters. However, the amount of plating
• This invention is based on the fact that the electrodeposition coatability can be improved even with a multi-layer plated steel sheet in which Fe-based plating is applied on pure Zn-plated or Zii-yarn alloy-plated. Since it was not perfect, it is intended to further improve the electrodeposition coating property and to provide a steel plate whose manufacturing cost is inexpensive.
• the steel sheet of the present invention is superior in the electrodeposition coating property because, when B is added to the bath at the time of the upper layer coating, the uniform electrodeposition property of the steel sheet is improved. Is improved, the plating layer becomes even, and if B is contained in the upper layer, if phosphate treatment is performed as a pre-coating treatment, These serve as nuclei during the deposition of phosphate, forming a fine and dense phosphate film.As a result, the electrical conductivity of the entire steel sheet surface becomes uniform, and It is presumed that this is because the paint is uniformly electrodeposited during painting, and the generation of creators is stably suppressed.
• Ki of Tsu because steel, on the upper cases of Ki Tsu Me B containing Fe, the amount of deposition Ki Tsu because even Tsu Oh in those Ri 3 / m 2 hereinafter-sided, was or If the layer is of the element-containing Fe-based alloy, the adhesion amount Ki Tsu because even Tsu Ah at 5 / ID 2 or less Ri-sided person, Ru occurrence of coating film click Les COMPUTER is suppressed. This is because even if the amount of coating is small, the upper layer is superior in covering the lower layer, and the coverage of the lower layer by the upper layer is improved. it is conceivable that .
• the upper layer is made of an Fe—Zn alloy
• the generation of coating film creators can be reduced.
• B is contained, even if the content is reduced to 50 to less than 100 wt%, the generation of coating film creators can be reduced. Can be obtained. The reason for this is presumed to be due to the above-mentioned effect of B on improving the phosphatability, but the ability to reduce the Fe content in this way is considered to be f. If this can be done, the corrosion potential difference between the upper layer and the lower layer will be small, and the long-term shochu-eating properties of the entire plating layer can be improved.
• the B content in the upper layer is preferably 0.001 to 3 wt%. This means that if the B content is less than 0.001 wt%, the crater generation and its fluctuations in the electrodeposition coating are the same as those of the upper layer that does not contain B, and the B content is lower. Even if it exceeds 3 wt%, the effect is saturated and even if it is more than that, it has no meaning.
• the coating weight of the upper layer is 0.5 to 10 for B-containing Fe plating, and 0.2 to 89 I for Fe-based alloy plating.
• the lower layer cannot be completely covered, and only the coating layer crater due to the exposure of the lower layer during electrodeposition coating is generated.
• it exceeds 10 / m 2 or more the effect of suppressing the coating film creators is flattened out, and it is necessary to increase them more. It is from. Na us, saturation of the coating film click Les COMPUTER inhibitory effect of this is conventional has a containing B Fe - For Ki single Me Zn alloy layer, 1 0 9 / «force was Tsu Ah with iota 2, In this respect, too, the effect of reducing the amount of deposits due to the addition is recognized.
• the upper layer contains 0.001 to 3 wt% of by the electroplating method, it is necessary to use an Fe-Zn-based or Fe- ⁇ -based Fe
• an Fe-Zn-based or Fe- ⁇ -based Fe for example, boric acid, metaboric acid, water-soluble metaborate, water-soluble tetraborate, tetrafluoroborate, etc. It is only necessary to add one or more kinds of boron compounds and adjust the pH of the bath to 1-3.
• Ki one because of the calling Akira of this steel sheet, but was or Ki single Me lower GaJun Z n Ru Oh than even that to improve the electrodeposition coating of the steel sheet Ki single Me Z n-based alloy, the lower layer Zn-based alloy fixing force f
• Ni in contrast to Zn-Fe-based alloy
• Fe but Zn-Ni thread alloy
• Co Cr, Mil, Mo
• Ti etc.
• the plating was performed by an electric plating method, a vapor deposition method, a melting plating method, or the like.
• the alloyed zinc-plated steel sheet is also suppressed.
• Zn-! Alloyed into a base alloy It is also suppressed.
• a cold-rolled steel sheet with a thickness of 0.8 mm is subjected to normal degreasing and pickling treatments to clean the surface, and then purely electroplated under the conditions shown in Table 1 by the electroplating method.
• a lower layer of Zn or Zn—Fe alloy or Zn—N alloy is applied, and then Fe, Fe— The upper layer of B was provided.
• the sales plate of this invention which has Fe-B plating on the upper layer, has pure Zn plating or Zn-based alloy on the lower layer. Even in the case of plating, the number of generated creators and their fluctuations are smaller than in the conventional multi-layered head plate with Fe coating on the upper layer and good electrodeposition coating. Absent .
• the content of B was adjusted by a combination of the soda metaborate concentration and the pH.
• Fe plating without B was carried out without adding soda metaborate. Table 2
• the present invention 6 It 0.75 4 0 to 5
• Comparative Example 1 Zn 0 10 0 to 18 Comparative Example 2 II 0 24 to 25 Comparative Example 3 Zn-Ni 0 35 to 23 Comparative Example 4 n—Fe 0 11 15 to 28 Comparative Example 5 Zn-Ni 0.0004 .32 to 22 Comparative Example 6 Zn—Fe 0.003 0.1 63 to 205
• Example 2 After the surface of a cold-rolled mesh plate having a thickness of 0.8 ffl M was cleaned in the same manner as in Example 1, the Zn-Fe alloy or Zn- ⁇ was first used under the conditions shown in Table 3. The lower layer of ⁇ alloy is applied, and then the upper layer of high Fe-Zn alloy containing ⁇ or high Fe-ZII alloy containing no B did.
• Example 2 Thereafter, a sample was taken from the steel sheet to be subjected to the above-mentioned treatment, and then subjected to phosphoric acid 3 ⁇ 4; ni, electrodeposition coating in the same manner as in Example 1 to obtain a coated plate having a coating thickness of 23 m. did.
• Table 4 shows the number of coating film cre- ters generated when a B-containing high Fe-Zn alloy was applied to the upper layer.
• the upper layer does not contain B.
• the first vapor deposition method in which the electric resistance heating type vapor deposition Zii space is placed below the position of ⁇ ⁇ by passing through the seal chamber where the pressure is reduced step by step and guided to the cabin, and came one Me depositing a net ⁇ ⁇ to steel ⁇ surface. Subsequently, the steel is guided to a second vapor deposition chamber having a structure similar to that of the first vapor deposition chamber disposed below the first vapor deposition chamber, and is guided to the opposite surface.
• the upper layer is coated with a high Fe-Zn alloy containing no B.
• the coated steel sheet of the present invention has a good painted appearance even when used not only for a single vehicle member, but also for other members such as a member of a household electrical appliance to which electrodeposition coating is applied, a building member, and the like. Obtainable .
• the coating properties of paints other than electrodeposition paints are excellent, they can be used for general coating purposes.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Electrochemistry (AREA)
• Electroplating Methods And Accessories (AREA)
• Other Surface Treatments For Metallic Materials (AREA)
• Laminated Bodies (AREA)
• Electroplating And Plating Baths Therefor (AREA)

Priority Applications (1)

Applications Claiming Priority (3)

Publications (1)

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Family Applications (1)

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Citations (2)

• 1986
  • 1986-03-29 JP JP61071884A patent/JPS62228498A/ja active Granted
• 1987
  • 1987-03-27 AU AU72080/87A patent/AU589767B2/en not_active Ceased
  • 1987-03-27 DE DE87902156T patent/DE3786056T2/de not_active Expired - Fee Related
  • 1987-03-27 WO PCT/JP1987/000190 patent/WO1987005950A1/ja active IP Right Grant
  • 1987-03-27 KR KR1019870700831A patent/KR920009844B1/ko not_active IP Right Cessation
  • 1987-03-27 EP EP87902156A patent/EP0264455B1/de not_active Expired - Lifetime
  • 1987-06-10 CA CA000539351A patent/CA1309055C/en not_active Expired - Lifetime

Patent Citations (2)

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