JP2018135543A - Plating method and plated metal roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plating method capable of enhancing adhesion to a metal roll.SOLUTION: A plated metal roll 1 has irregularity formed by physically treating the surface of an aluminum metal roll 10 and has distinct and dense surface irregularity obtained by further performing chemical etching after defatting. The metal roll 10 is subjected to plating through substitution treatment. The plating to which the metal roll 10 is subjected enters into the irregularity and is hardly peeled from the metal roll 10 compared with when only sandblast treatment or only acid treatment is performed before plating.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a plating method and a plated metal roll.

  For example, Patent Document 1 discloses a method in which a ceramic is chemically eroded or sandblasted, and then an antibacterial metal material is chemically plated on the surface of the ceramic.

JP-A-11-335856

  It aims at providing the plating method with high adhesiveness with respect to metal rolls.

  The plating method of the plated metal roll according to the present invention comprises a step of forming irregularities on the surface of the metal roll by physical collision with the metal roll, and the metal roll having irregularities formed by physical collision. , A step of degreasing, a step of etching the degreased metal roll with an acidic solution, and a step of plating the metal roll after the etching treatment.

  Preferably, the method further includes a step of replacing the plated metal roll.

  The plated metal roll according to the present invention includes a first layer having irregularities formed by physical collision on the surface, and a second layer that is a metal thin film formed on the first layer. And the first layer is subjected to a degreasing process and an etching process using an acidic solution.

  Preferably, the first layer is subjected to a replacement treatment with a replacement liquid.

  Preferably, the metal of the metal roll is aluminum.

  Preferably, the total length is 2400 mm at the maximum and the outer diameter is φ30 to φ250.

  A plating method having high adhesion to a metal roll can be provided.

1 is a diagram illustrating a plated metal roll 1; FIG. It is a flowchart explaining the plating process (S10) of the plating metal roll 1. FIG. It is a figure which illustrates the state where metal roll 10 was immersed in plating solution.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating a plated metallic roll 1.
As illustrated in FIG. 1, a plated metal roll 1 includes a metal roll 10 having a first layer 100, a second layer 102 that is a plated layer formed on the first layer 100, And a plating layer formed on the second layer 102. A metal roll is a roll formed of aluminum, for example, a roller for transporting a machine that produces a high-performance film used in a coater, a slitter, a film drying furnace, and the like. More specifically, the metal roll 10 has a roll outer diameter of φ30 to φ250 and a total length of about 2400 mm at the maximum.
The first layer 100 has irregularities formed by physical collision. Specifically, the first layer 100 is a layer in which irregularities are formed on the surface of the metal roll 10 by spraying an abrasive at high speed (sand blasting) using compressed air, centrifugal force, or the like. In this example, the sand material used for sand blasting is alumina with a count of 150.

The first layer 100 has been degreased. Specifically, in order to remove the fats and oils on the first layer 100, the metal roll 10 is immersed in a solution using an acidic degreasing agent to perform degreasing.
The first layer 100 is subjected to an etching process and smut removal. In the etching process, the oxide film formed on the first layer 100 is removed from the degreased first layer 100 using an acid. In this example, the oxide film is removed by immersing the metal roll 10 on which the first layer 100 is formed in an acidic solution containing potassium monopersulfate and potassium persulfate, and an acidic solution made of sulfuric acid. To do. Further, the first layer 100 is freed of smut generated during the removal of the oxide film. By removing the oxide film and the smut, the already formed oxide film and the oxide film formed after the formation of the first layer 100 are removed. Thereby, the oxide film which covered the unevenness | corrugation of the 1st layer 100 formed by sandblasting is removed, and an unevenness | corrugation becomes clear. In the etching by chemical treatment, unevenness having a size different from that of the physical treatment is formed, and the unevenness of the first layer 100 becomes denser.
As described above, the first layer 100 is made of a clean state suitable for plating by removing oils and fats and an oxide film, and the metal roll 10 is subjected to a physical process called sandblasting and a chemical process called etching. It is formed by roughening the surface.

Further, the first layer 100 subjected to the etching process is subjected to a replacement process with a replacement liquid. Specifically, the first layer 100 is formed of a metal roll in an aqueous solution in which zinc is dissolved in a strong alkaline solution in order to remove an oxide film newly formed during air and water washing and prevent reoxidation. 10 is immersed to form a zinc film on the first layer 100. In this example, an aqueous solution containing zinc oxide and sodium hydroxide is used.
The zinc coating on the first layer 100 is peeled once and then subjected to zinc replacement again. As a result, a finer zinc film is formed on the first layer 100. In this example, the same solution as that used for etching (an acidic solution containing potassium monopersulfate and potassium persulfate and an acidic solution containing sulfuric acid) is used for peeling.

The second layer 102 is a layer in which a metal thin film is formed on the first layer 100. The metal thin film is, for example, nickel plating, and the nickel plating penetrates into the unevenness of the first layer 100. This makes it difficult for the second layer 102 to peel from the first layer 100, that is, the metal roll 10.
The second layer 102 is formed by plating the first layer 100 that has been subjected to the zinc replacement treatment. Specifically, the second layer 102 is formed by immersing the metal roll 10 having the first layer 100 subjected to the zinc replacement treatment in a nickel plating solution. More specifically, in the second layer 102, nickel plating is formed on the first layer 100 by replacing the zinc film on the first layer 100 with nickel in the plating solution. In this example, a watt bath is used for the plating solution, and the components include nickel sulfate, nickel chloride, and boric acid. Thereby, nickel plating is performed on the first layer 100 to form the second layer 102. The thickness of the second layer is about 10-15 μm. Excellent corrosion resistance due to nickel plating.

  On the second layer 102, a hard chrome plating layer is further formed. Specifically, the second layer 102 is subjected to a degreasing process and an etching process, and then a hard chromium plating layer immerses the metal roll 10 in the hard chromium plating bath on the second layer 102. Is formed. Hard chrome plating has high hardness and is excellent in wear resistance and durability.

FIG. 2 is a flowchart for explaining the plating process (S10) on the metal roll 10. As shown in FIG.
As illustrated in FIG. 2, in step 100 (S100), the metal roll 10 is subjected to sand blasting to form irregularities on the surface thereof. The first layer 100 is formed by sandblasting.
In step 105 (S105), the metal roll 10 is degreased using an acidic solution. Specifically, the metal roll 10 having the first layer 100 subjected to sandblasting is immersed in an alkaline solution at 50 ° C. for 5 minutes. After degreasing, it is washed with water, and the solution adhering to the metal roll 10 is poured, so that it is not mixed with the solution to be immersed.
In step 110 (S110), the degreased metal roll 10 is etched. The degreased metal roll 10 is immersed in an acidic solution at 50 ° C. for 2 minutes to remove the oxide film on the metal roll 10. Further, the smut generated during the removal of the oxide film is removed. As in S105, after the acid treatment, it is washed with water.
In step 115 (S115), the acid-treated metal roll 10 is subjected to zinc substitution treatment (primary substitution). The metal roll 10 is immersed in a 25 ° C. solution in which zinc is dissolved in a strong alkaline solution, and the storage tank containing the solution is swung for 40 seconds to form a zinc film on the metal roll 10. Then wash with water.
In step 120 (S120), the zinc film formed in S115 is peeled off. Specifically, the metal roll 10 is immersed in an acidic solution at 30 ° C. for 40 seconds. Thereafter, it is washed with water so that no acidic solution remains on the metal roll 10.
In step 125 (S125), the zinc replacement process (secondary replacement) is performed again. Similar to the primary substitution, the sample is immersed in an aqueous solution at 25 ° C. in which zinc is dissolved in a strong alkaline solution, and the aqueous solution storage tank is shaken for 20 seconds. Thereby, a finer zinc film can be formed on the first layer 100. Then wash with water.
In step 130 (S130), the metal roll 10 subjected to the zinc replacement process is subjected to a plating process. Specifically, the metal roll 10 on which the zinc film is formed by S125 is immersed in a 50 ° C. watt bath for 20 minutes. In that case, it supplies with electricity to the metal roll 10, and (30A-40A) electroplating is performed. As illustrated in FIG. 3, the metal roll 10 immersed in the plating tank 3 is subjected to nickel plating while being rotated by the rotation mechanism 32. The plated layer applied on the first layer 100 is the second layer 102.
In step 135 (S135), a degreasing process is performed on the metal roll 10 on which the second layer 102 has been formed in S130, as in S105.
In step 140 (S140), similarly to S110, the metal roll 10 degreased in S135 is subjected to an etching process and a smut removing process.
In step 145 (S 145), the metal roll 10 is immersed in a hard chrome plating bath to form a hard chrome plating layer on the second layer 102. The hard chrome plating is applied to the metal roll 10 by electrolytic plating.
In step 150 (S150), the hard chrome-plated metal roll 10 is mirror-polished to correct the balance, and then inspected.

FIG. 3 is a diagram illustrating a nickel plating tank 3 according to the present invention.
As illustrated in FIG. 3, the plating tank 3 includes a container 30 that stores a plating solution, a rotation mechanism 32 that rotates the metal roll 10 immersed in the container 30, and an anode 34 that is disposed inside the container 30. Have The container 30 stores a Watt bath as a plating solution. The metal roll 10 immersed in the plating solution is energized as a cathode, and is subjected to nickel plating while being rotated about the axis by the rotation mechanism 32.

  As described above, the plated metal roll 1 has a surface with irregularities formed by physical processing (sand blasting), and is further subjected to chemical treatment (etching treatment). The unevenness of the metal roll 1 is made clear and dense. Since plating is performed after these treatments, the plating enters the unevenness of the metal roll 10 and adhesion between the metal roll 10 and the plating increases. That is, the plating is more difficult to peel from the metal roll 10 as compared with the case where only the sandblasting process or the pretreatment of the acid process is performed.

In the above-described embodiment, the first layer 100 has irregularities formed by spraying an abrasive at high speed. For example, the first layer 100 is scraped by a file, sandpaper, or the like. Unevenness may be formed on the surface.
Moreover, in the said embodiment, although the acidic degreasing agent is used for a degreasing agent, if it can remove the fats and oils on the 1st layer 100, it will not be limited to this, For example, using an alkaline degreasing agent You may degrease.

DESCRIPTION OF SYMBOLS 1 ... Plating metal roll 3 ... Plating tank 10 ... Metal roll 30 ... Container 32 ... Rotating mechanism 34 ... Anode 100 ... 1st layer 102 ... 2nd layer

Claims (6)

Forming irregularities on the surface of the metal roll by physical collision with the metal roll; and
Degreasing the metal roll on which irregularities are formed by physical collision; and
Etching the degreased metal roll with an acidic solution;
And a step of plating the metal roll after the etching process. The plating method according to claim 1, further comprising a step of replacing the plated metal roll. A first layer having irregularities formed by physical collision on the surface;
A second layer that is a metal thin film formed on the first layer;
The first layer is subjected to a degreasing process and an etching process using an acidic solution. The plated metal roll according to claim 3, wherein the first layer is subjected to a replacement treatment with a replacement liquid. The plated metal roll according to claim 3, wherein the metal of the metal roll is aluminum. The total length is up to 2400mm,
The plated metal roll according to claim 3, wherein the outer diameter is φ30 to φ250.

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