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Method for stripping metallic thin film plated on surface of material

A metal thin film and peeling material technology, which is applied in the field of material surface treatment, can solve the problems of difficult peeling of metal thin films, achieve good peeling effect, simple production and maintenance, and inhibit damage

Inactive Publication Date: 2011-11-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for stripping the metal film coated on the surface of the material, which solves the problem of difficult stripping of the metal film coated on the material surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A total of 10 pieces of 316L stainless steel sheets with an area of ​​1 square centimeter, the thickness of the Au film plated on them is 0.2 microns, and a steel ball with a diameter of 1 mm is used as the cathode conductive medium, and they are placed in a hanging basket together, and the molar concentration is In the 0.0001M sodium hydroxide aqueous solution, use it as the cathode and the titanium basket as the anode, electrolyze the aqueous solution under vibration conditions, the cathode current density is 90 amperes / square meter, and the Au film coated on the stainless steel substrate will evolve hydrogen at the cathode after 5 minutes detached from the substrate. Next, the peeled Au film was collected by filtration, the stainless steel substrate was taken out, and washed with deionized water to obtain the Au film aggregate and the stainless steel substrate respectively.

Embodiment 2

[0013] A multilayer structure Ag / Er thin film coated on a glass plate with an area of ​​100 square centimeters, the single layer thickness of Ag and Er is 0.1 micron, and the total thickness is 1 micron, and it is placed in a sodium chloride solution with a molar concentration of 1M In it, it is used as the cathode and used in conjunction with the graphite anode. Under the condition of stirring, the electrolysis process is carried out in the aqueous solution at -3°C. The cathode current density is 50 amperes / square meter. After 5 minutes, the multi-layer coated glass plate The structure Ag / Er thin film is detached from the substrate under the action of cathodic hydrogen evolution. Next, the peeled metal film was collected by filtration, the glass plate was taken out, and washed with deionized water respectively to obtain the Ag / Er thin film aggregate and the glass plate substrate respectively.

Embodiment 3

[0015] A polyethylene film with an area of ​​4 square centimeters, on which the thickness of the Pt film plated is 0.5 microns, is placed in a potassium sulfate solution with a molar concentration of 0.005M, and it is used as a cathode and used in conjunction with a platinum anode. The water electrolysis process is carried out at room temperature, and the cathode current density is 3000 amperes / square meter. After 10 minutes, the Pt film coated on the polyethylene film falls off from the polyethylene film under the action of hydrogen evolution at the cathode. Next, the stripped Pt was collected by filtration, the polyethylene film was taken out, and washed with deionized water to obtain Pt film aggregates and polyethylene film respectively.

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Abstract

The invention discloses a method for stripping a metallic thin film attached to the surface of a material, belonging to the technical field of surface treatment of materials. The method comprises the following steps that: a metallic thin film coated on the surface of a material is connected to a circuit and used as a negative electrode; the metallic thin film is coupled with a counter electrode, then driven by an external power supply and performed a brine electrolysis process in an electrolyte solution, so that a hydrogen evolution reaction is implemented on the metallic thin film, wherein the electric current density of the negative electrode is 30-3000 amperes / square meter, the molar concentration of an electrolyte is 0.0001-1M, and the temperature of the electrolyte solution is minus 5-90 DEG C; the metallic thin film is stripped from a matrix under a mechanical action caused by precipitated hydrogen, then a matrix material and the stripped metallic thin film are respectively collected; the electrolyte solution attached to the surfaces of the matrix material and the stripped metallic thin film are scoured off by water so as to obtain a matrix material and a metallic thin film bunch which are separated from each other. The method disclosed by the invention has the advantages of good metallic thin film stripping effect, small required equipment investment, simple production and maintenance, cleanness and speediness; and by using the method, the damage to a stripping process on the matrix material is avoided or inhibited.

Description

technical field [0001] The invention belongs to the technical field of material surface treatment, in particular to a method for peeling off a metal film attached to the surface of a material. Background technique [0002] Stripping off the metal film coated on the surface of the material is an important technology, which has broad application requirements, such as metal resource recovery, scientific research, etc. Conventional methods for stripping the metal film coated on the surface of the material include mechanical stripping, introducing thermal stress using temperature difference, physical separation after crushing, etching and dissolution, etc. However, the mechanical peeling method is often difficult to completely peel off the firmly attached metal film on the surface of the material, or cause damage to the substrate. However, the thermal stress method may cause damage to the base material that cannot withstand high or low temperatures. Etching and dissolution met...

Claims

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Application Information

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IPC IPC(8): C25F5/00
Inventor 曹江利
Owner UNIV OF SCI & TECH BEIJING
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