CN115494117A - Method for quantitatively analyzing concentration of tin brightener - Google Patents
Method for quantitatively analyzing concentration of tin brightener Download PDFInfo
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- CN115494117A CN115494117A CN202211324022.4A CN202211324022A CN115494117A CN 115494117 A CN115494117 A CN 115494117A CN 202211324022 A CN202211324022 A CN 202211324022A CN 115494117 A CN115494117 A CN 115494117A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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Abstract
The invention relates to the technical field of circuit board production and manufacturing, in particular to a method for quantitatively analyzing concentration of a tin brightener, which comprises the following steps: s1, providing a Hall groove; setting a right-angle surface of the Hall cell as an anode side, and setting an inclined surface of the Hall cell as a cathode side; s2, placing the brass sheet on the cathode side of the Hall cell; placing a pure tin sheet on the anode side of the Hall cell; s3, connecting the anode side and the cathode side with an external power supply; s4, measuring the width of the cathode side blackening region after time t; and S5, calculating the concentration of the tin soldering agent according to the width of the cathode side blackening area. According to the invention, the brass sheet is placed in the Hall groove, after the Hall groove is electrified, the brass sheet is influenced by the current density and the concentration of the tin polish, and the crystallization fineness degree of the tin surface in the Hall groove is inconsistent, so that the cathode side of the Hall groove is blackened.
Description
Technical Field
The invention relates to the technical field of circuit board production and manufacturing, in particular to a method for quantitatively analyzing concentration of a tin brightener.
Background
With the rapid development of the information industry, the demand for solder-plating of electronic components, semiconductors, and printed wiring boards has increased significantly. Tin plating has been widely used in the electronics industry as a protective and solderable plating for electronic components, wires, printed wiring boards, and integrated circuit blocks because of its excellent corrosion resistance and solderability.
The tin plating brightener is divided into organic brightener and inorganic brightener, wherein the organic brightener is organic brightener and is beneficial to reezing castor oil, sulfite pulp liquor, dextrin, zeityl sulfonic acid and the like, the organic brightener can improve the cathode polarization and the dispersing capacity, the plating layer is crystallized, fine and glossy, and can mask metal impurities, the inorganic brightener is nickel sulfate or cobalt salt, the commonly used nickel sulfate can improve the physical property of the plating layer and enhance the gloss, but the brightener cannot be excessive so as to prevent the plating layer from being crisp and bubbling.
When using the tin-plating brightener on the circuit board, need use the tin-plating brightener of different concentrations to different circuit boards, when the concentration label of tin-plating brightener drops, perhaps when autonomic reconfiguration tin-plating brightener, the user is difficult to confirm the concentration of tin-plating brightener fast.
Disclosure of Invention
The invention aims to provide a method for quantitatively analyzing the concentration of a tin brightener, aiming at the defects in the prior art.
The purpose of the invention is realized by the following technical scheme: a method for quantitatively analyzing the concentration of a tin brightener comprises the following steps:
s1, providing a Hall groove; setting a right-angle surface of the Hall cell as an anode side, and setting an inclined surface of the Hall cell as a cathode side;
s2, placing the brass sheet on the cathode side of the Hall cell; placing a pure tin sheet on the anode side of the Hall cell;
s3, connecting the anode side and the cathode side with an external power supply;
s4, measuring the width of the cathode side blackening region after time t;
and S5, calculating the concentration of the tin soldering agent according to the width of the cathode side blackening area.
The invention is further arranged that in step S3 the current of the external power supply is 3A.
The invention is further arranged that in step S4 the time t is 1min.
The invention is further arranged that, between step S1 and step S2, the following steps are included: the brass sheet is placed in 8-10% sulfuric acid solution, taken out after 1-2min of activation time, and washed by distilled water.
The invention is further arranged such that, in step S5, according to the formula: concentration of tin brightener = a width of blackened area-b, concentration of tin brightener was calculated.
The invention is further arranged that the formula is: the concentration of the tints =1.497 × width of the blackened areas-14.54.
The invention further provides that the calculation of the formula comprises the following steps:
r1: providing a Hall groove; setting a right-angle surface of the Hall cell as an anode side, and setting an inclined surface of the Hall cell as a cathode side;
r2: placing the brass sheet on the cathode side of the Hall cell; placing a pure tin sheet on the anode side of the Hall cell;
r3: providing n tin luster-out agents of known concentration;
r4: connecting the anode side and the cathode side with an external power supply, and putting n tin light agents with known concentration under different power supply currents;
r5: observing the blackening definition of the cathode side under different power supply currents, and selecting a current I;
r6: sequentially placing n tin polish agents with known concentration under the current I;
r7: calculating the width of the cathode side blackened area under different concentrations of the tin light agent;
r8: a linear fit was made according to the concentration of the tin brightener and the width of the cathode side blackened area.
The invention has the beneficial effects that: according to the invention, the brass sheet is placed in the Hall cell, and after the Hall cell is electrified, the crystallization fineness of the tin surface in the Hall cell is inconsistent under the influence of the current density and the concentration of the tin soldering agent, so that the cathode side of the Hall cell is blackened.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived on the basis of the following drawings without inventive effort.
FIG. 1 is a top view of a Hall cell of the present invention;
FIG. 2 is a schematic diagram of a Hall cell according to the present invention;
FIG. 3 is a line-of-fit plot of the present invention;
wherein: 1. a right-angled surface; 2. an inclined surface.
Detailed Description
The invention is further described with reference to the following examples.
As can be seen from fig. 1 to 3, the method for quantitatively analyzing the concentration of the tin brightener includes the following steps:
s1, providing a Hall groove; setting a right-angle surface 1 of the Hall cell as an anode side, and setting an inclined surface 2 of the Hall cell as a cathode side;
s2, placing the brass sheet on the cathode side of the Hall cell; placing a pure tin sheet on the anode side of the Hall cell;
s3, connecting the anode side and the cathode side with an external power supply;
s4, measuring the width of the cathode side blackening region after time t;
and S5, calculating the concentration of the tin soldering agent according to the width of the cathode side blackening area.
Specifically, in the method for quantitatively analyzing the concentration of the tin soldering agent, the brass sheet is placed in the hall cell, after the hall cell is powered on, the tin surface in the hall cell is affected by the current density and the concentration of the tin soldering agent, the crystallization fineness of the tin surface in the hall cell is inconsistent, so that the cathode side of the hall cell is blackened, and the concentration of the tin soldering agent can be calculated by measuring the width of a blackened area on the cathode side, so that the method is simple and rapid, and is convenient for a user to measure the concentration of the tin soldering agent.
In step S3, the current of the external power source is 3A. When the current is 3A, the black area on the cathode side can be clearly seen.
In the method for quantitatively analyzing the concentration of the tin brightener, in step S4, the time t is 1min. In the case where the time t is 1min, the tinting agent in the hall cell can react sufficiently, so that the cathode side of the hall cell is blackened.
In this embodiment, the method for quantitatively analyzing the concentration of the tin brightener further includes, between step S1 and step S2, the following steps: the brass sheet is placed in 8-10% sulfuric acid solution, taken out after 1-2min of activation time, and washed by distilled water. Through the setting, the interference of the last test on the concentration test can be effectively prevented.
In step S5, a method for quantitatively analyzing a tin brightener concentration according to the formula: concentration of tin brightener = a × width of black area-b, concentration of tin brightener was calculated.
In this embodiment, the formula of the method for quantitatively analyzing the concentration of the tin brightener is as follows: the concentration of the tints =1.497 × width of the blackened areas-14.54. The tin brightener concentration can be effectively calculated by the above setting.
In the method for quantitatively analyzing the concentration of the tin brightener, the calculation of the formula includes the following steps:
r1: providing a Hall groove; setting a right-angle surface 1 of the Hall cell as an anode side, and setting an inclined surface 2 of the Hall cell as a cathode side;
r2: placing the brass sheet on the cathode side of the Hall cell; placing a pure tin sheet on the anode side of the Hall cell;
r3: providing n known concentrations of tin brightener;
r4: connecting the anode side and the cathode side with an external power supply, and putting n tin light agents with known concentration under different power supply currents;
r5: observing the blackening definition of the cathode side under different power supply currents, and selecting a current I;
r6: sequentially placing n tin luster-coating agents with known concentration under the current I;
r7: calculating the width of the cathode side blackened area under different concentrations of the tin light agent;
r8: a linear fit was made according to the concentration of the tin brightener and the width of the cathode side blackened area.
Specifically, before calculating the concentration calculation formula, firstly, the current of an external power supply needs to be determined, the blackening definition of the cathode side is observed under different power supply currents, so that the test current is selected, when the glazing current is 3A, the frosted (black and gray) area on the brass sheet is increased along with the increase of the concentration of the tin brightener, the concentration is preliminarily deduced to be within the range of 20 ml/L-30 ml/L, and the result is almost consistent with the concentration result of the externally measured tin brightener; then, under the condition that the current was 3A, the tints at different concentrations were sequentially put in, the data shown in the following table were obtained, and linear fitting was performed according to the concentration of the tints and the width of the cathode side blackening region, so that the concentration of the tin formulations was =1.497 and the width of the blackening region-14.54, and the fitting residual was 98.7%, so that the concentration of the tin formulations could be calculated according to the concentration of the tin formulations =1.497 and the width of the blackening region-14.54.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. A method for quantitatively analyzing the concentration of a tin brightener is characterized by comprising the following steps: the method comprises the following steps:
s1, providing a Hall groove; setting a right-angle surface (1) of the Hall cell as an anode side, and setting an inclined surface (2) of the Hall cell as a cathode side;
s2, placing the brass sheet on the cathode side of the Hall cell; placing a pure tin sheet on the anode side of the Hall cell;
s3, connecting the anode side and the cathode side with an external power supply;
s4, measuring the width of the cathode side blackening region after time t;
and S5, calculating the concentration of the tin soldering agent according to the width of the cathode side blackening area.
2. The method for quantitatively analyzing the concentration of a tin brightener as claimed in claim 1, wherein: in step S3, the current of the external power supply is 3A.
3. The method for quantitatively analyzing the concentration of a tin brightener as claimed in claim 1, wherein: in step S4, the time t is 1min.
4. The method for quantitatively analyzing the concentration of a tin brightener as set forth in claim 1, wherein: between step S1 and step S2, the following steps are further included: the brass sheet is placed in 8-10% sulfuric acid solution, taken out after 1-2min of activation time, and washed by distilled water.
5. The method for quantitatively analyzing the concentration of a tin brightener as claimed in claim 1, wherein: in step S5, according to the formula: concentration of tin brightener = a width of blackened area-b, concentration of tin brightener was calculated.
6. The method for quantitatively analyzing the concentration of a tin brightener as set forth in claim 5, wherein: the formula is: the concentration of the tints =1.497 × width of the blackened areas-14.54.
7. The method for quantitatively analyzing the concentration of tin brightener as set forth in claim 5, wherein: the calculation of the formula comprises the following steps:
r1: providing a Hall groove; setting a right-angle surface (1) of the Hall cell as an anode side, and setting an inclined surface (2) of the Hall cell as a cathode side;
r2: placing the brass sheet on the cathode side of the Hall cell; placing a pure tin sheet on the anode side of the Hall cell;
r3: providing n tin luster-out agents of known concentration;
r4: connecting the anode side and the cathode side with an external power supply, and putting n tin light agents with known concentration under different power supply currents;
R5: observing the blackening definition of the cathode side under different power supply currents, and selecting a current I;
r6: sequentially placing n tin polish agents with known concentration under the current I;
r7: calculating the width of the cathode side blackened area under different concentrations of the tin light agent;
r8: a linear fit was made according to the concentration of the tin brightener and the width of the cathode side blackened area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211324022.4A CN115494117A (en) | 2022-10-27 | 2022-10-27 | Method for quantitatively analyzing concentration of tin brightener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211324022.4A CN115494117A (en) | 2022-10-27 | 2022-10-27 | Method for quantitatively analyzing concentration of tin brightener |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115494117A true CN115494117A (en) | 2022-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211324022.4A Pending CN115494117A (en) | 2022-10-27 | 2022-10-27 | Method for quantitatively analyzing concentration of tin brightener |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115494117A (en) |
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2022
- 2022-10-27 CN CN202211324022.4A patent/CN115494117A/en active Pending
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