CN115767938A - Gold plating method applied to reinforced steel sheet - Google Patents
Gold plating method applied to reinforced steel sheet Download PDFInfo
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- CN115767938A CN115767938A CN202211496194.XA CN202211496194A CN115767938A CN 115767938 A CN115767938 A CN 115767938A CN 202211496194 A CN202211496194 A CN 202211496194A CN 115767938 A CN115767938 A CN 115767938A
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- steel sheet
- reinforced steel
- dry film
- reinforced
- exposure
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 121
- 239000010959 steel Substances 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 78
- 238000007747 plating Methods 0.000 title claims abstract description 61
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000010931 gold Substances 0.000 title claims abstract description 38
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 38
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 25
- 238000005530 etching Methods 0.000 claims abstract description 11
- 238000009713 electroplating Methods 0.000 claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 239000000758 substrate Substances 0.000 claims abstract description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 54
- 238000007731 hot pressing Methods 0.000 claims description 24
- 239000003814 drug Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 abstract description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
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Abstract
The invention discloses a gold plating method applied to a reinforced steel sheet, which comprises the following steps: providing a substrate: selecting a reinforced steel sheet without any coating on the surface; designing a graph; nickel plating: carrying out overall nickel plating on the reinforced steel sheet when the reinforced steel sheet is conveyed to a nickel plating process; sticking a dry film, exposing by using a film, developing, etching and removing the film to obtain the preset shape of the reinforced steel sheet; continuously pasting a dry film, and then exposing and developing to ensure that the dry film is only remained on the non-working part of the reinforced steel sheet; gold plating: continuously electroplating the reinforced steel sheet for 790-810s at 82-86 ℃ so that the working part of the reinforced steel sheet is covered with a gold plating layer; the working part of the reinforced steel sheet comprises a plurality of body parts and edge parts, wherein the body parts are distributed in an array manner, and one end of each body part extends to the edge part; removing the film: and removing the dry film at the non-working part of the reinforced steel sheet. The invention at least comprises the following advantages: the grounding resistance is stable and small, and the welding performance is optimized.
Description
Technical Field
The invention relates to the technical field of circuit boards, in particular to a gold plating method applied to a reinforced steel sheet.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
In most cases, the circuit board needs to be matched with a reinforcing steel sheet for use in the using process. The conventional reinforced steel sheet is mainly fixed with a circuit board through a nickel layer on the surface of the steel sheet by means of soldering. However, due to the influences of materials, operation methods and the like, the welding difficulty is high, and the welding joint of the two parts is irregular, so that the grounding resistance value of the reinforced steel sheet after being pressed with the circuit board cannot meet the required requirement (is not more than 0.4 omega), the reliability is poor and the like.
It should be noted that the above description of the background art is provided for the sake of clarity and complete description of the technical solutions of the present invention, and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.
Disclosure of Invention
In order to overcome the defects in the prior art, the embodiment of the invention provides a gold plating method applied to a reinforced steel sheet, and solves the problems of high grounding resistance and poor reliability in the prior art.
The embodiment of the application discloses: a gold selective plating method applied to a reinforced steel sheet comprises the following steps:
providing a substrate: selecting a reinforced steel sheet without any coating on the surface;
designing a pattern: photo-drawing a preset graph designed by software into two films at the top and the bottom by a photo-drawing machine;
nickel plating: carrying out overall nickel plating on the reinforced steel sheet when the reinforced steel sheet is conveyed to a nickel plating process;
pasting a dry film, exposing by using a film, then developing, etching and removing the film, and specifically comprises the following steps: sticking a dry film on the surface of the nickel-plated reinforced steel sheet in a hot pressing mode; then arranging the reinforced steel sheet between the two films, and transferring the pattern exposure of the two films to a dry film through exposure; then the reinforced steel sheet passes through a developing process at the speed of 2.3-2.7m/min, so that a pattern is developed on the reinforced steel sheet; then, etching the developed reinforcing steel sheet by using liquid medicine to obtain a preset shape of the reinforcing steel sheet; performing surface film removal treatment on the reinforced steel sheet with a preset shape;
pasting a dry film, then exposing and developing, and specifically comprising the following steps: sticking a dry film on the reinforced steel sheet with a preset shape in a hot pressing mode; then, a dry film is only remained on the non-working part of the reinforced steel sheet through the procedures of exposure and development;
gold plating: conveying the reinforcing steel sheet with a preset shape through the exposure and development processes to an electroplating process, and continuously electroplating the reinforcing steel sheet for 790-810 seconds at the temperature of 82-86 ℃ so that the working part of the reinforcing steel sheet is covered with a gold-plated layer; the working part of the reinforced steel sheet comprises a plurality of body parts and edge parts which are distributed in an array manner, the rest parts are non-working parts of the reinforced steel sheet, and one end of the body part extends to the edge parts;
removing the film: and the reinforcing steel sheet after the gold plating process is conveyed to a film removing process at a constant speed so as to remove a dry film at a non-working part of the reinforcing steel sheet.
Further, in the step of "performing full-face nickel plating on the reinforcing steel sheet when the reinforcing steel sheet is conveyed to a nickel plating process", the full-face nickel plating is performed on the reinforcing steel sheet at 81-85 ℃ for 1950-2050 s.
Further, in the step of pasting a dry film on the surface of the nickel-plated reinforced steel sheet in a hot pressing manner, the reinforced steel sheet is hot-pressed and conveyed at a speed of 2.3-2.7m/min, and the temperature parameter in the hot pressing process is 85-110 ℃, and the pressure is 4.5-5.5kg/cm 2 So as to paste the dry film on the surface of the reinforced steel sheet.
Further, in the step "then setting the reinforcing steel sheet between two films, transferring the pattern exposure of the two films onto a dry film by exposure", the exposure parameters of the reinforcing steel sheet: the precision is 11-13 μm, the PE value is 38-42, and the number of exposure scales is 8-10.
Further, in the step "the working portion of the reinforced steel sheet includes a plurality of body portions and edge portions distributed in an array, and the rest are non-working portions of the reinforced steel sheet", two adjacent body portions are connected by a connecting rib.
Further, gluing the reinforced steel sheet after the gold plating and film removing procedures, wherein the first surface of the reinforced steel sheet is provided with a gold plating layer, coating a conductive adhesive on the second surface of the reinforced steel sheet in a hot pressing manner, and the first surface and the second surface of the reinforced steel sheet are arranged oppositely.
Further, the step of pasting a dry film, then exposing and developing specifically comprises the following steps: sticking a dry film on the reinforcing steel sheet with a preset shape in a hot pressing mode; then, a dry film is only remained in a non-working part of the reinforced steel sheet through the processes of exposure and development,
the reinforced steel sheet is hot-pressed and conveyed at a speed of 0.8-1.0m/min, and the temperature parameter in the hot-pressing process is 90-100 ℃, and the pressure is 5.0-5.2kg/cm 2 Sticking a dry film on the non-working surface of the reinforced steel sheet;
the reinforced steel sheet subjected to the hot pressing is conveyed to an exposure process, and parameters of the exposure process comprise: the precision is 11-13 μm, the PE value is 20-30, and the number of exposure scales is 6-8;
and conveying the exposed reinforced steel sheet to a developing process at the speed of 2.6-3.0m/min, and finishing developing to ensure that a dry film only remains on a non-working part of the reinforced steel sheet.
By means of the technical scheme, the invention has the following beneficial effects: firstly, selecting a reinforcing steel plate with proper size parameters and clean surface, obtaining the reinforcing steel plate with a preset shape by the procedures of designing a pattern, plating nickel, pasting a dry film, exposing by using a film, developing, etching, removing the film and the like, and keeping the dry film only on a non-working part of the reinforcing steel plate by the procedures of pasting the dry film, exposing, developing and the like; performing gold plating treatment on the reinforced steel plate, wherein the working part of the reinforced steel plate can be electroplated with a gold plating layer by controlling parameters such as temperature, time and the like, and the working part comprises a plurality of body parts and edge parts which are distributed in an array manner; the reinforcing steel plate with gold plated selectively obtained by adopting the structure and the process has the advantages that in the subsequent tinning connection process with the circuit board, tin only climbs on the gilding layer and cannot be diffused to a non-working area, namely, the body part and the edge part of the integral reinforcing steel plate can be effectively, uniformly and regularly connected with the circuit board, so that the grounding resistance is small (not more than 0.15 omega) and the resistance is stable.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method in an embodiment of the invention;
fig. 2 is a schematic structural view of a reinforcing steel plate in an example of the invention.
Reference numerals of the above figures: 1. a reinforcing steel plate; 2. a body portion; 3. edge parts.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is considered as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Referring to fig. 1 and 2, the present embodiment discloses a method for selectively plating gold on a reinforced steel sheet, comprising the following steps:
providing a substrate: selecting a reinforced steel sheet without any coating on the surface;
designing a pattern: photo-drawing a preset graph designed by software into two films at the top and the bottom by a photo-drawing machine;
nickel plating: carrying out overall nickel plating on the reinforced steel sheet when the reinforced steel sheet is conveyed to a nickel plating process;
pasting a dry film, exposing by using a film, then developing, etching and removing the film, and specifically comprises the following steps: sticking a dry film on the surface of the nickel-plated reinforced steel sheet in a hot pressing mode; then arranging the reinforced steel sheet between the two films, and transferring the pattern exposure of the two films to a dry film through exposure; then the reinforced steel sheet passes through a developing process at the speed of 2.3-2.7m/min, so that a pattern is developed on the reinforced steel sheet; then, etching the developed reinforcing steel sheet by using liquid medicine to obtain a preset shape of the reinforcing steel sheet; carrying out surface film removal treatment on the reinforced steel sheet with a preset shape;
pasting a dry film, then exposing and developing, and specifically comprising the following steps: sticking a dry film on the reinforcing steel sheet with a preset shape in a hot pressing mode; then, a dry film is only remained on the non-working part of the reinforced steel sheet through the procedures of exposure and development;
gold plating: conveying the reinforced steel sheet with a preset shape through the exposure and development processes to an electroplating process, and continuously electroplating the reinforced steel sheet for 790-810 seconds at the temperature of 82-86 ℃ so that the working part of the reinforced steel sheet is covered with a gold plating layer; the working part of the reinforced steel sheet comprises a plurality of body parts 2 and edge parts 3 which are distributed in an array manner, the rest parts are non-working parts of the reinforced steel sheet, and one end of the body part 2 extends to the edge part 3;
and (3) removing the film: and the reinforcing steel sheet after the gold plating process is conveyed to a film removing process at a constant speed so as to remove a dry film at a non-working part of the reinforcing steel sheet.
According to the method, firstly, a reinforced steel plate 1 with proper size parameters and clean surface is selected, the reinforced steel plate 1 with a preset shape can be obtained through the procedures of designing a pattern, plating nickel, pasting a dry film, exposing with a film, then developing, etching, removing the film and the like, and then the dry film is only remained on a non-working part of the reinforced steel plate through the procedures of pasting the dry film, then exposing, developing and the like; performing gold plating treatment on the reinforced steel plate 1, wherein the working part of the reinforced steel plate 1 can be electroplated with a gold plating layer by controlling parameters such as temperature, time and the like in the process, and the working part comprises a plurality of body parts 2 distributed in an array manner and edge parts 3; the reinforcing steel plate 1 selectively plated with gold obtained by adopting the structure and the process has the advantages that in the subsequent process of tin plating connection with the circuit board, tin only climbs on the gold plating layer and cannot be diffused to a non-working area, namely, the body part 2 and the edge part 3 of the whole reinforcing steel plate 1 can be effectively, uniformly and regularly connected with the circuit board, so that the grounding resistance is small (namely, not more than 0.15 omega) and the resistance is stable.
One embodiment includes:
providing a substrate: selecting a reinforced steel sheet without any coating on the surface, wherein the size of the reinforced steel sheet can be 250mm × 350mm;
designing a pattern: and (3) photoplotting the preset graph designed by the software into two films at the top and the bottom by a photoplotting machine.
Nickel plating: and when the reinforced steel sheet is conveyed to a nickel plating process, carrying out overall nickel plating on the reinforced steel sheet at the temperature of 81-85 ℃ for 1950-2050 s.
Pasting a dry film, exposing by using a film, then developing, etching and removing the film, and specifically comprises the following steps: and sticking a dry film on the surface of the nickel-plated reinforced steel sheet in a hot pressing mode, specifically, the reinforced steel sheet is hot-pressed and conveyed at the speed of 2.3-2.7m/min, and the temperature parameter in the hot pressing process is 85-110 ℃, and the pressure is 4.5-5.5kg/cm < 2 > so as to stick the dry film on the surface of the reinforced steel sheet.
Then, arranging the reinforced steel sheet between the two films, and transferring the pattern exposure of the two films onto a dry film through exposure, wherein the exposure parameters of the reinforced steel sheet are as follows: the precision is 11-13 μm, the PE value is 38-42, and the number of exposure ruler grids is 8-10.
Then the reinforced steel sheet passes through a developing process at the speed of 2.3-2.7m/min, so that a pattern is developed on the reinforced steel sheet; then etching the developed reinforced steel sheet by using liquid medicine to obtain a preset shape of the reinforced steel sheet; and performing surface film removing treatment on the reinforced steel sheet with a preset shape.
Pasting a dry film, then exposing and developing, and specifically comprising the following steps: sticking a dry film on the reinforcing steel sheet with a preset shape in a hot pressing mode; and then, a dry film is only remained on the non-working part of the reinforced steel sheet through the processes of exposure and development.
Specifically, the reinforced steel sheet is hot-pressed and conveyed at the speed of 0.8-1.0m/min, the temperature parameter in the hot-pressing procedure is 90-100 ℃, and the pressure is 5.0-5.2kg/cm < 2 >, so that a dry film is attached to the non-working surface of the reinforced steel sheet;
the reinforced steel sheet subjected to hot pressing is conveyed to an exposure process, and parameters of the exposure process comprise: the precision is 11-13 μm, the PE value is 20-30, and the number of exposure scales is 6-8;
and conveying the exposed reinforced steel sheet to a developing process at the speed of 2.6-3.0m/min, and finishing developing to ensure that a dry film only remains on a non-working part of the reinforced steel sheet.
Gold plating: conveying the reinforcing steel sheet with a preset shape through the exposure and development processes to an electroplating process, and continuously electroplating the reinforcing steel sheet for 790-810 seconds at the temperature of 82-86 ℃ so that the working part of the reinforcing steel sheet is covered with a gold-plated layer; the working part of the reinforced steel sheet comprises a plurality of body parts 2 and edge parts 3 which are distributed in an array mode, the rest parts are non-working parts of the reinforced steel sheet, and one end of each body part 2 extends to each edge part 3. Preferably, two adjacent body parts 2 are connected by a connecting rib.
It is worth noting here that: the main body 2 is rectangular and distributed in a rectangular array, and the number and the gap thereof can be adaptively designed according to the requirement, which will not be described herein. Note also that the edge portion 3 refers to an edge of each ridge of the reinforce steel plate 1 and a side wall of the reinforce steel plate 1, and is positioned as the edge portion 3 described above because the entire thickness of the reinforce steel plate 1 is small.
Removing the film: and the reinforcing steel sheet after the gold plating process is conveyed to a film removing process at a constant speed so as to remove a dry film at a non-working part of the reinforcing steel sheet.
And gluing the reinforcing steel sheet after the gold plating and film removing procedures, wherein the first surface of the reinforcing steel sheet is provided with a gold plating layer, coating a conductive adhesive on the second surface of the reinforcing steel sheet in a hot pressing mode, and the first surface and the second surface of the reinforcing steel sheet are arranged oppositely.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (7)
1. A gold selective plating method applied to a reinforced steel sheet is characterized by comprising the following steps:
providing a substrate: selecting a reinforced steel sheet without any coating on the surface;
designing a pattern: photo-drawing a preset graph designed by software into two films at the top and the bottom by a photo-drawing machine;
nickel plating: carrying out overall nickel plating on the reinforced steel sheet when the reinforced steel sheet is conveyed to a nickel plating process;
pasting a dry film, exposing by using a film, then developing, etching and removing the film, and specifically comprises the following steps: sticking a dry film on the surface of the nickel-plated reinforced steel sheet in a hot pressing mode; then arranging the reinforced steel sheet between the two films, and transferring the pattern exposure of the two films to a dry film through exposure; then the reinforced steel sheet passes through a developing process at the speed of 2.3-2.7m/min, so that a pattern is developed on the reinforced steel sheet; then etching the developed reinforced steel sheet by using liquid medicine to obtain a preset shape of the reinforced steel sheet; performing surface film removal treatment on the reinforced steel sheet with a preset shape;
pasting a dry film, then exposing and developing, and specifically comprising: sticking a dry film on the reinforced steel sheet with a preset shape in a hot pressing mode; then, a dry film is only remained on the non-working part of the reinforced steel sheet through the procedures of exposure and development;
gold plating: conveying the reinforced steel sheet with a preset shape through the exposure and development processes to an electroplating process, and continuously electroplating the reinforced steel sheet for 790-810 seconds at the temperature of 82-86 ℃ so that the working part of the reinforced steel sheet is covered with a gold plating layer; the working part of the reinforced steel sheet comprises a plurality of body parts and edge parts which are distributed in an array manner, the rest parts are non-working parts of the reinforced steel sheet, and one end of the body part extends to the edge parts;
removing the film: and the reinforcing steel sheet after the gold plating process is conveyed to a film removing process at a constant speed so as to remove a dry film at a non-working part of the reinforcing steel sheet.
2. The selective plating method for a reinforcing steel sheet according to claim 1, wherein in the step of "plating the entire surface of the reinforcing steel sheet with nickel while the reinforcing steel sheet is being conveyed to the nickel plating process", the entire surface of the reinforcing steel sheet is plated with nickel at a temperature of 81 to 85 ℃ for 1950 to 2050 s.
3. The selective gold plating method for a reinforced steel sheet according to claim 1, wherein the reinforced steel sheet is transferred by hot pressing at a speed of 2.3 to 2.7m/min in the step of applying a dry film on the surface of the reinforced steel sheet after nickel plating by hot pressing at a temperature of 85 to 110 ℃ under a pressure of 4.5 to 5.5kg/cm 2 So as to paste the dry film on the surface of the reinforced steel sheet.
4. The selective gold plating method applied to a reinforcing steel sheet according to claim 1, wherein in the step "then setting the reinforcing steel sheet between two films, pattern exposure of the two films is transferred onto a dry film by exposure", exposure parameters of the reinforcing steel sheet are: the precision is 11-13 μm, the PE value is 38-42, and the number of exposure ruler grids is 8-10.
5. The selective gold plating method applied to a reinforcing steel sheet according to claim 1, wherein in the step "the working portion of the reinforcing steel sheet includes a plurality of body portions arranged in an array and edge portions, and the rest are non-working portions of the reinforcing steel sheet", adjacent two of the body portions are connected by a connecting rib.
6. The selective gold plating method applied to a reinforcing steel sheet according to claim 1, wherein the reinforcing steel sheet after the gold plating and stripping process is coated with a gold plating layer on a first surface thereof, and a conductive paste is coated on a second surface thereof by hot pressing, the first surface and the second surface of the reinforcing steel sheet being disposed opposite to each other.
7. The selective gold plating method applied to a reinforced steel sheet according to claim 1, wherein the step of "attaching a dry film, then exposing and developing specifically comprises: sticking a dry film on the reinforcing steel sheet with a preset shape in a hot pressing mode; then, a dry film is only remained in a non-working part of the reinforced steel sheet through the processes of exposure and development,
the reinforced steel sheet is hot-pressed and conveyed at a speed of 0.8-1.0m/min, and the temperature parameter in the hot-pressing process is 90-100 ℃, and the pressure is 5.0-5.2kg/cm 2 Sticking a dry film on the non-working surface of the reinforced steel sheet;
the reinforced steel sheet subjected to hot pressing is conveyed to an exposure process, and parameters of the exposure process comprise: the precision is 11-13 μm, the PE value is 20-30, and the number of exposure ruler grids is 6-8;
and conveying the exposed reinforced steel sheet to a developing process at the speed of 2.6-3.0m/min, and finishing developing to ensure that a dry film only remains on a non-working part of the reinforced steel sheet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211496194.XA CN115767938A (en) | 2022-11-25 | 2022-11-25 | Gold plating method applied to reinforced steel sheet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211496194.XA CN115767938A (en) | 2022-11-25 | 2022-11-25 | Gold plating method applied to reinforced steel sheet |
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