CN111940253A - Chemical milling protective adhesive dip-coating method - Google Patents
Chemical milling protective adhesive dip-coating method Download PDFInfo
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- CN111940253A CN111940253A CN202010823165.4A CN202010823165A CN111940253A CN 111940253 A CN111940253 A CN 111940253A CN 202010823165 A CN202010823165 A CN 202010823165A CN 111940253 A CN111940253 A CN 111940253A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/02—Local etching
- C23F1/04—Chemical milling
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Abstract
The invention provides a dip-coating method of chemical milling protective glue, which comprises the steps of blending glue solution, pre-treating a workpiece, mounting and hanging, dipping glue, dripping, leveling, drying and the like. Meanwhile, the process of the dip-coating method of the chemical milling protective adhesive is used for the first time in the same industry in China, fills the blank in the industry, improves the manufacturing level of the chemical milling process, plays an important role in enhancing the production capacity and innovation capacity of companies, and has a good promoting effect on improving the manufacturing level of aviation and aerospace in China.
Description
Technical Field
The invention belongs to the technical field of surface processing, relates to a chemical milling protective adhesive dip-coating method, and more particularly relates to a chemical milling protective adhesive coating method suitable for aluminum alloy workpieces.
Background
Chemical milling (chemical milling for short) is a special processing technology in which a part of a metal material to be processed is exposed to a specific chemical medium for corrosion, a part which is not required to be processed is protected, and the shape and the size required by a workpiece are obtained by controlling the shape and the corrosion time. In chemical milling production, the coating of the protective adhesive is mostly finished by manual brushing and spraying, and the defects of uneven surface thickness of the adhesive film, easy generation of bubbles, low utilization rate of the adhesive solution, long production period, low production efficiency, great harm to human bodies, great difficulty in waste gas treatment and the like exist in manual operation.
Disclosure of Invention
The invention aims to provide a dip-coating method of chemical milling protective glue, which is used for solving the problems in the prior art. The method utilizes automatic conveying equipment, adopts autonomous dip-coating process parameters and process flow to control, avoids manual operation, forms uniform glue films without bubbles, ensures that the gluing rate of workpieces is close to 100 percent, improves the production efficiency, hardly generates waste gas and reduces the environmental hazard.
The technical scheme of the invention is as follows:
a dip-coating method of chemical milling protective glue comprises the following steps:
(1) blending glue solution: tetrachloroethylene is adopted to adjust the construction viscosity of the protective adhesive to 15S-40S;
(2) pretreatment of a workpiece:
the pretreatment comprises the following steps: bright dipping, cold water washing, alkali corrosion, warm water washing, cold water washing, bright dipping and cold water washing, which are specifically as follows:
a) light emission: treating in 300g/L-500g/L nitric acid solution at room temperature for 0.5min-2 min;
b) alkali corrosion: controlling the temperature of the bath solution at 40-55 ℃, and treating for 2-5 min in 20-35 g/L sodium hydroxide solution;
c) light extraction after alkali corrosion: at room temperature, in 300g/L-500g/L nitric acid solution until the workpiece recovers the bright surface;
d) warm water washing: treating in warm water at 30-50 deg.c for 1-2 min;
e) and (3) cold water washing: treating in cold water at room temperature for 1-2 min;
(3) mounting and hanging: the workpieces cannot be contacted with each other, so that air pockets are avoided, the distance between the workpieces is not less than 150mm, and the hanging material adopts stainless steel wires;
(4) gum dipping: slowly immersing the workpiece into a dipping tank, keeping for 10-15 s after the workpiece is completely immersed, and slowly taking out the workpiece;
(5) and (4) dripping: taking the workpiece out of the dipping tank, standing the workpiece above the tank liquor or in the glue dripping tank, and dripping for at least 30 min;
(6) leveling and drying: leveling at room temperature for at least 10min, and drying at 40-60 deg.C for at least 30 min; the glue film is complete and continuous, and has no defects of pinholes, bubbles, scratches and the like, and the thickness of the glue film is not less than 0.2 mm;
further, when the width of the gumming workpiece is more than or equal to 1000mm, dip-coating for 2 times (repeated procedures: gumming → dripping → leveling and drying); when the width of the gummed workpiece is less than 1000mm, dip-coating is carried out for 3 times (repeating the steps of gumming → dripping → leveling and drying). The workpiece must be turned over after each dip coating so that the next dip coating can be carried out.
The invention has the advantages that:
the implementation of the dip-coating method of the chemical milling protective adhesive effectively solves the problems of non-uniform adhesive film, multiple leak points and larger influence of human factors caused by manual adhesive brushing and spraying of the chemical milling, effectively ensures the quality of the chemical milling adhesive film and improves the chemical milling quality of airplane parts. Meanwhile, the process of the dip-coating method of the chemical milling protective adhesive is used for the first time in the same industry in China, fills the blank in the industry, improves the manufacturing level of the chemical milling process, plays an important role in enhancing the production capacity and innovation capacity of companies, and has a good promoting effect on improving the manufacturing level of aviation and aerospace in China.
Drawings
Fig. 1 is a gum dipping schematic diagram of a chemical milling protective gum dip coating method provided in an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto. The following provides specific materials and sources thereof used in embodiments of the present invention. However, it should be understood that these are exemplary only and not intended to limit the invention, and that materials of the same or similar type, quality, nature or function as the following reagents and instruments may be used in the practice of the invention. The experimental procedures used in the following examples are all conventional procedures unless otherwise specified. Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1
Fig. 1 is a gum dipping schematic diagram of a chemical milling protective gum dip coating method provided in an embodiment of the present invention. Referring to fig. 1, in the present embodiment, the chemical milling protective paste dip coating method includes:
(1) blending glue solution: before each work, the construction viscosity of the protective adhesive needs to be adjusted to 15S (the cup for measuring the viscosity is EZ 5# Zahn cup), and tetrachloroethylene is adopted for viscosity adjustment.
(2) Pretreatment of a workpiece:
a) light emission: treating in 300g/L nitric acid solution (rho is 1.42g/mL) at room temperature for 2 min;
b) alkali corrosion: controlling the temperature of the bath solution at 40 ℃, and treating for 5min by using 20g/L sodium hydroxide solution;
c) light extraction after alkali corrosion: at room temperature, in 300g/L nitric acid solution (rho 1.42g/mL) until the workpiece regains a shiny surface;
d) warm water washing: treating with 30 deg.C warm water for 2 min;
e) and (3) cold water washing: treating in cold water at room temperature for 2 min.
(3) Mounting and hanging: the workpieces can not be contacted with each other, and air pockets are avoided. The distance between the workpieces is not less than 150mm, and the hanging material is stainless steel wire.
(4) Gum dipping: and slowly immersing the workpiece into the dipping tank, keeping for 15s after the workpiece is completely immersed, and slowly taking out the workpiece.
(5) And (4) dripping: and (4) taking the workpiece out of the dipping tank, standing the workpiece above the tank liquor or in the glue dripping tank, and dripping for 40 min.
(6) Leveling and drying: leveling for 15min at room temperature, and drying at 40 deg.C for 60 min. The adhesive film should be complete and continuous and should not have defects such as pinholes, bubbles, scratches and the like. The thickness of the adhesive film should not be less than 0.2 mm.
In the embodiment, the width of the dipped workpiece is more than or equal to 1000mm, dip-coating is carried out for 2 times (repeated procedures: dipping → dripping → leveling and drying), and the workpiece needs to be turned over after each dip-coating so as to carry out next dip-coating.
Example 2
A dip-coating method of chemical milling protective glue comprises the following steps:
(1) blending glue solution: before each work, the construction viscosity of the protective adhesive needs to be adjusted to 40S (the cup for measuring the viscosity is EZ 5# Zahn cup), and tetrachloroethylene is adopted for viscosity adjustment.
(2) Pretreatment of a workpiece:
a) light emission: treated with 500g/L nitric acid solution (ρ 1.42g/mL) at room temperature for 0.5 min;
b) alkali corrosion: controlling the temperature of the bath solution at 55 ℃, and treating for 2min by using 35g/L sodium hydroxide solution;
c) light extraction after alkali corrosion: in a 500g/L nitric acid solution (rho 1.42g/mL) at room temperature until the workpiece regains a shiny surface;
d) warm water washing: treating with warm water at 50 deg.C for 1 min;
e) and (3) cold water washing: treating in cold water at room temperature for 1 min.
(3) Mounting and hanging: the workpieces can not be contacted with each other, and air pockets are avoided. The distance between the workpieces is not less than 150mm, and the hanging material is stainless steel wire.
(4) Gum dipping: and slowly immersing the workpiece into the dipping tank, keeping for 15s after the workpiece is completely immersed, and slowly taking out the workpiece.
(5) And (4) dripping: and (4) taking the workpiece out of the dipping tank, standing the workpiece above the tank liquor or in the glue dripping tank, and dripping for 45 min.
(6) Leveling and drying: leveling for 20min at room temperature, and drying at 60 deg.C for 35 min. The adhesive film should be complete and continuous and should not have defects such as pinholes, bubbles, scratches and the like. The thickness of the adhesive film should not be less than 0.2 mm.
In this example, the width of the dipped work piece is < 1000mm, and dip-coating should be performed 3 times (repeating process: dipping → dripping → leveling and drying). The workpiece must be turned over after each dip coating so that the next dip coating can be carried out.
Example 3
A dip-coating method of chemical milling protective glue comprises the following steps:
(1) blending glue solution: before each work, the construction viscosity of the protective adhesive needs to be adjusted to 30S (the cup for measuring the viscosity is EZ 5# Zahn cup), and tetrachloroethylene is adopted for viscosity adjustment.
(2) Pretreatment of a workpiece:
a) light emission: treating in 400g/L nitric acid solution (rho is 1.42g/mL) at room temperature for 1 min;
b) alkali corrosion: controlling the temperature of the bath solution at 50 ℃, and treating for 3.5min by using 30g/L sodium hydroxide solution;
c) light extraction after alkali corrosion: in a 400g/L nitric acid solution (rho 1.42g/mL) at room temperature until the workpiece regains a shiny surface;
d) warm water washing: treating with warm water at 40 deg.C for 1.5 min;
e) and (3) cold water washing: treating in cold water at room temperature for 1.5 min.
(3) Mounting and hanging: the workpieces can not be contacted with each other, and air pockets are avoided. The distance between the workpieces is not less than 150mm, and the hanging material is stainless steel wire.
(4) Gum dipping: and slowly immersing the workpiece into the dipping tank, keeping the workpiece for 10-15S after the workpiece is completely immersed, and slowly taking out the workpiece.
(5) And (4) dripping: and (4) taking the workpiece out of the dipping tank, standing the workpiece above the tank liquor or in the glue dripping tank, and dripping for 30 min.
(6) Leveling and drying: leveling for 10min at room temperature, and drying at 50 deg.C for 30 min. The adhesive film should be complete and continuous and should not have defects such as pinholes, bubbles, scratches and the like. The thickness of the adhesive film should not be less than 0.2 mm.
In the embodiment, the width of the gummed workpiece is more than or equal to 1000mm, and dip-coating is carried out for 2 times (the repeated procedure is gumming → dripping → leveling and drying); the workpiece must be turned over after each dip coating so that the next dip coating can be carried out.
Therefore, the dip-coating method of the chemical milling protective adhesive is simple in technological method operation, the obtained workpiece has the characteristics of uniform adhesive film thickness, no air bubbles and good binding force, the requirements of the chemical milling workpiece are met, the product qualification rate is ensured to a great extent, and the product quality and the production efficiency are improved.
The above description of exemplary embodiments has been presented only to illustrate the technical solution of the invention and is not intended to be exhaustive or to limit the invention to the precise form described. Obviously, many modifications and variations are possible in light of the above teaching to those skilled in the art. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to thereby enable others skilled in the art to understand, implement and utilize the invention in various exemplary embodiments and with various alternatives and modifications. It is intended that the scope of the invention be defined by the following claims and their equivalents.
Claims (2)
1. The dip-coating method of the chemical milling protective glue is characterized by comprising the following steps:
(1) blending glue solution: tetrachloroethylene is adopted to adjust the construction viscosity of the protective adhesive to 15S-40S;
(2) pretreatment of a workpiece:
the pretreatment comprises the following steps: bright dipping, cold water washing, alkali corrosion, warm water washing, cold water washing, bright dipping and cold water washing, which are specifically as follows:
a) light emission: treating in 300g/L-500g/L nitric acid solution at room temperature for 0.5min-2 min;
b) alkali corrosion: controlling the temperature of the bath solution at 40-55 ℃, and treating for 2-5 min in 20-35 g/L sodium hydroxide solution;
c) light extraction after alkali corrosion: at room temperature, in 300g/L-500g/L nitric acid solution until the workpiece recovers the bright surface;
d) warm water washing: treating in warm water at 30-50 deg.c for 1-2 min;
e) and (3) cold water washing: treating in cold water at room temperature for 1-2 min;
(3) mounting and hanging: the workpieces cannot be contacted with each other, so that air pockets are avoided, the distance between the workpieces is not less than 150mm, and the hanging material adopts stainless steel wires;
(4) gum dipping: slowly immersing the workpiece into a dipping tank, keeping for 10-15 s after the workpiece is completely immersed, and slowly taking out the workpiece;
(5) and (4) dripping: taking the workpiece out of the dipping tank, standing the workpiece above the tank liquor or in the glue dripping tank, and dripping for at least 30 min;
(6) leveling and drying: leveling at room temperature for at least 10min, and drying at 40-60 deg.C for at least 30 min; the adhesive film should be complete and continuous, and should not have defects such as pinholes, bubbles, scratches, etc., and the thickness of the adhesive film should not be less than 0.2 mm.
2. The dip-coating method of the chemical milling protective adhesive according to claim 1, wherein when the width of the dipped work piece is more than or equal to 1000mm, dip-coating is performed for 2 times, namely, the step (4) to the step (6) are performed for 2 times; and (5) when the width of the gum dipping workpiece is less than 1000mm, dip-coating for 3 times, namely performing the steps (4) to (6) for 3 times.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010823165.4A CN111940253A (en) | 2020-08-17 | 2020-08-17 | Chemical milling protective adhesive dip-coating method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010823165.4A CN111940253A (en) | 2020-08-17 | 2020-08-17 | Chemical milling protective adhesive dip-coating method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112608654A (en) * | 2020-12-07 | 2021-04-06 | 中昊北方涂料工业研究设计院有限公司 | Dip-coating type chemical milling protective adhesive |
| CN115418639A (en) * | 2022-09-29 | 2022-12-02 | 中国航发动力股份有限公司 | Chemical milling solution and method for stainless steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101122025A (en) * | 2007-08-09 | 2008-02-13 | 成都飞机工业（集团）有限责任公司 | Titanium alloying milling solution and milling technique used for the same |
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2020
- 2020-08-17 CN CN202010823165.4A patent/CN111940253A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101122025A (en) * | 2007-08-09 | 2008-02-13 | 成都飞机工业（集团）有限责任公司 | Titanium alloying milling solution and milling technique used for the same |
Non-Patent Citations (1)
| Title |
|---|
| 刘诗超: "低毒环保铝合金化铣保护涂料的应用研究", 《能源研究与管理》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112608654A (en) * | 2020-12-07 | 2021-04-06 | 中昊北方涂料工业研究设计院有限公司 | Dip-coating type chemical milling protective adhesive |
| CN115418639A (en) * | 2022-09-29 | 2022-12-02 | 中国航发动力股份有限公司 | Chemical milling solution and method for stainless steel |
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Application publication date: 20201117 |