초록
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A zinc whiskerless galvanized product has a multi-layer rust prevention film that provides excellent rust prevention, self-repair ability, and coating adhesion. A manufacturing method provides a zinc whiskerless galvanized product having the multi-layer rust prevention film. The multi-layer rust prevention film can be provided without the use of chemicals injurious to the environment such as sexivalent chrome. The multi-layer rust prevention film can be applied to various electronic components including computer equipment, communication equipment, or the...
A zinc whiskerless galvanized product has a multi-layer rust prevention film that provides excellent rust prevention, self-repair ability, and coating adhesion. A manufacturing method provides a zinc whiskerless galvanized product having the multi-layer rust prevention film. The multi-layer rust prevention film can be provided without the use of chemicals injurious to the environment such as sexivalent chrome. The multi-layer rust prevention film can be applied to various electronic components including computer equipment, communication equipment, or the like.
대표
청구항
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1. A whiskerless galvanized product having a multi-layer rust prevention film, comprising a galvanized film, formed to adhere strongly on a surface of a metal substrate, having a lattice distortion of 0.02 to 0.35% of plated film measured by an X-ray diffractometer and a carbon content of 0.01 to 0.07 mass % in plated film, a first rust prevention film mainly containing tannic acid and formed to adhere strongly on the surface of said galvanized film, a second rust prevention film containing mainly metal ions and/or metal compounds formed on an upper port...
1. A whiskerless galvanized product having a multi-layer rust prevention film, comprising a galvanized film, formed to adhere strongly on a surface of a metal substrate, having a lattice distortion of 0.02 to 0.35% of plated film measured by an X-ray diffractometer and a carbon content of 0.01 to 0.07 mass % in plated film, a first rust prevention film mainly containing tannic acid and formed to adhere strongly on the surface of said galvanized film, a second rust prevention film containing mainly metal ions and/or metal compounds formed on an upper portion of said first rust prevention film, and a third rust prevention film mainly containing tannic acid and formed to adhere strongly on said second rust prevention film. 2. The galvanized product of claim 1, wherein said metal substrate has a surface of a metal selected from the group consisting of iron base material, zinc, nickel, aluminum, magnesium, copper and alloys of two or more metals selected from the group consisting of zinc, nickel, aluminum, magnesium, and copper.3. The galvanized product of claim 1, wherein said metal ion is selected from the group consisting of Mo, V, Ti, W, Zr, and a mixture of two species or more selected from the group consisting of Mo, V, Ti, W, and Zr, while said metal compound contains a metal selected from the group consisting of Mo, V, Ti, W, Zr and mixture of two kinds or more of metals.4. The galvanized product of claim 1, wherein each of said at least one metal compound comprises a metal selected from the group consisting of Mo, V, Ti, W, and Zr.5. The galvanized product of claim 1, plated on the surface of the metal substrate using a zinc cyanide bath of which caustic soda concentration is 50 to 160 g/L, zinc concentration is 10 to 30 g/L, a ratio of sodium cyanide concentration (g/L) to zinc concentration (g/L) is more than 3 and equal or inferior to 4, and to which a brightener is added.6. The galvanized product of claim 5 wherein: said metal substrate has a surface of a metal selected from the group consisting of iron base material, zinc, nickel, aluminum, magnesium, copper and alloys of two or more metals selected from the group consisting of zinc, nickel, aluminum, magnesium, and copper; and said metal ion is selected from the group consisting of Mo, V, Ti, W, Zr and a mixture of two species or more selected from the group consisting of Mo, V, Ti, W, and Zr, while said metal compound contains a metal selected from the group consisting of Mo, V, Ti, W, Zr, and a mixture of two kinds or more of these metals. 7. The galvanized product of claim 5, wherein: said metal substrate has a surface of a metal selected from the group consisting of iron base material, zinc, nickel, aluminum, magnesium, copper and alloys of two or metals selected from the group consisting of zinc, nickel, aluminum, magnesium, and copper; and each of said at least one metal compound comprises a metal selected from the group consisting of Mo, V, Ti, W, and Zr. 8. A manufacturing method of a galvanized product having a multi-layer rust prevention film, comprising a galvanized film, formed to adhere strongly on a surface of a metal substrate, having a lattice distortion of 0.02 to 0.35% of plated film measured by an X-ray diffractometer and a carbon content of 0.01 to 0.07 mass % in plated film, a first rust prevention film mainly containing tannic acid and formed to adhere strongly on the surface of said galvanized film, a second rust prevention film an containing mainly metal ions and/or metal compounds formed on upper portion of said first rust prevention film, and a third rust prevention film mainly containing tannic acid and formed to adhere strongly on said second rust prevention film, comprising the steps of: forming to adhere strongly a galvanized film having a lattice distortion of 0.02 to 0.35% of plated film measured by an X-ray diffractometer and a carbon content of 0.01 to 0.07 mass % in plated film, by plating on a surface of a metal substra te using a zinc cyanide bath of which caustic soda concentration is 50 to 160 g/L, zinc concentration is 10 to 30 g/L, a ratio of sodium cyanide concentration (g/L) to zinc concentration (g/L) is more than 3 and equal or inferior to 4, and to which a brightener is added, and washing the galvanized film with water; next, forming a first rust prevention film mainly containing tannic acid to adhere strongly on the surface of the galvanized film by treating the surface of said galvanized film with a first treatment liquid containing tannic acid, and washing the formed first rust prevention film with water; next, forming a second rust prevention film containing mainly metal ions and/or metal compounds on the upper portion of the first rust prevention film by treating with a second treatment liquid containing metal ions and/or metal compounds, and washing the formed second rust prevention film with water; and next, forming a third rust prevention film mainly containing tannic acid to adhere strongly on the surface of the second rust prevention film by treating with the first treatment liquid containing tannic acid, and washing the formed third rust prevention film with water and drying the formed third rust prevention film.
