Semi-quantitative rapid determination method for RV value of chemical gold plating liquid medicine

Abstract

The invention provides a semi-quantitative rapid determination method for the RV value of a chemical gold plating liquid medicine, and relates to the field of rapid solution detection, pure water, an iodine solution, a sodium thiosulfate solution, a starch indicator and a sulfuric acid solution are added into a brown glass bottle, a series of reaction reagents with different RV values are prepared by controlling the adding amount of the sodium thiosulfate solution, a measurement gradient is formed, and the RV value of the chemical gold plating liquid medicine is determined. Respectively adding equivalent to-be-detected solution into each gradient reagent, fully and uniformly mixing, and quickly judging the RV value of the to-be-detected solution according to the characteristic color change presented by the reaction system, the quick determination method provided by the invention can quickly obtain the concentration range of the to-be-detected component, effectively improve the rate of titration analysis, and improve the accuracy of titration analysis. And the concentration of the component to be detected can be analyzed according to the color change of the mixed solution in the bottle only by using a pipette to sample and adding the sample into the titration bottle without depending on the operation of professional personnel, so that the operation is very simple and convenient.

Description

Technical Field

[0001] The invention relates to the field of rapid solution detection, in particular to a semi-quantitative rapid determination method for RV value of chemical gold plating solution. Background Art

[0002] As semiconductor packaging continues to increase in integration, the circuit designs of package housings and substrates are becoming increasingly complex. Electroplating, due to its requirement for pre-established electrical connections, is difficult to adapt to the plating requirements of multi-island package housings and substrates, such as SIPs and BGAs. In contrast, electroless gold plating, with its advantage of not requiring an external current, has shown significant potential in this field and continues to expand its application. To achieve functional gold layers thicker than 0.1μm, the industry generally utilizes a reduction-based electroless gold plating process (also known as thick electroless gold). This process utilizes a reducing agent, such as hypophosphite, borane, or hydrazine, to reduce gold ions in a solution and deposit the resulting metallic gold layer. In this process, the reducing agent concentration in the solution is a critical parameter that directly influences the deposition rate and final coating quality. Therefore, the reducing agent concentration indicator (RV value) must be strictly monitored during production. Currently, monitoring and measuring the RV value of gold plating solutions primarily relies on titration analysis. This method precisely measures the volume of a standard titrant of known concentration consumed to completely react with the substance being measured (reducing agent), and then calculates the content of the component being measured based on the stoichiometric relationship established in the chemical reaction. Its core principle is based on chemical reaction types such as acid-base titration, redox titration, precipitation titration, or complexometric titration. However, existing titration analysis methods suffer from cumbersome procedures, requiring the operator to add the titrant dropwise and repeat the operation multiple times to obtain an average value. This results in an inability to quickly determine the content of the component being measured during sample measurement. Furthermore, this method is highly dependent on the operator's professional experience and technical skills. Accurate control of the titration speed, the semi-titration operation for endpoint determination, and the subjective judgment of color observation are all prone to significant human error, especially for novice or non-professional personnel, which can affect the accuracy of monitoring results and process stability. Summary of the Invention

[0003] The purpose of the present invention is to provide a semi-quantitative rapid determination method for the RV value of chemical gold plating solution to solve the above technical problems.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A semi-quantitative and rapid method for determining the RV value of chemical gold plating solution is used. Pure water, iodine solution, sodium thiosulfate solution, starch indicator, and sulfuric acid solution are added to a brown glass bottle. By controlling the amount of sodium thiosulfate solution added, a series of reaction reagents with different RV values ​​are prepared to form a measurement gradient. An equal amount of the test solution is added to each gradient reagent. After thorough mixing, the RV value of the test solution is quickly determined based on the characteristic color change of the reaction system.

[0005] Preferably, after the test solution reacts with each gradient reagent, if the mixed solution is colorless, it means that the RV value of the test solution is greater than or equal to the RV value of the reaction reagent; if the mixed solution is blue, it means that the RV value of the test solution is less than the RV value of the reaction reagent; if the mixed solution is dark, it means that the RV value of the test solution is much less than the RV value of the reaction reagent.

[0006] Preferably, the measurement range and accuracy of the reaction reagents can be flexibly adjusted by adjusting the concentration and addition amount of each reagent.

[0007] The beneficial effects of the present invention are as follows: the rapid determination method proposed in the present invention can quickly obtain the concentration range of the component to be measured, effectively improving the rate of titration analysis, and does not rely on professional personnel to perform the operation. It only needs to use a pipette to take a sample and add it to the titration bottle to analyze the concentration of the component to be measured according to the color change of the mixed solution in the bottle. The operation is very simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 Schematic diagram when the solution is colorless; Figure 2 Schematic diagram when the solution is blue; Figure 3 Schematic diagram when the solution is dark. DETAILED DESCRIPTION

[0009] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0010] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0011] Specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0012] Example 1 In this embodiment, a semi-quantitative rapid determination method for the RV value of chemical gold plating solution is proposed. A 10ml brown glass bottle is used as a container to store iodine solution in the dark. 2ml of pure water, 1ml of 0.5mol / L iodine solution, 0.2ml of starch solution, and 1ml of 0.5mol / L sulfuric acid solution are added to the bottle. The measurement range is adjusted by controlling the amount of sodium thiosulfate solution added. In specific operation, 0.1ml, 0.15ml, 0.2ml, and 0.25ml of 0.1mol / L sodium thiosulfate solution are added to the reagent bottle, respectively, so that the corresponding RV values ​​of the reagent bottle are 18, 17, 16, and 15, and the measurement accuracy is 1. 0.1ml of the solution is added to the reagent bottle. If the solution becomes colorless, it indicates that the RV value of the solution is greater than or equal to the RV value of the reagent bottle; if the solution turns blue, it indicates that the RV value of the solution is less than the RV value of the reagent bottle; if the solution color remains dark, it indicates that the RV value of the solution is much less than the RV value of the reagent bottle. According to the color change, the current potion RV value range can be obtained through two or three reagent bottles. For further explanation, the above colors can be referred to Figure 1-Figure 3 .

[0013] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0014] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A semi-quantitative rapid determination method of the RV value of chemical gold plating solution, characterized by: Add pure water, iodine solution, sodium thiosulfate solution, starch indicator, and sulfuric acid solution to a brown glass bottle. By controlling the amount of sodium thiosulfate solution added, a series of reaction reagents with different RV values ​​are prepared to form a measurement gradient. Add an equal amount of the test solution to each gradient reagent, mix thoroughly, and quickly determine the RV value of the test solution based on the characteristic color change of the reaction system.

2. The semi-quantitative rapid determination method of RV value of chemical gold plating solution according to claim 1, wherein: After the test solution reacts with each gradient reagent, if the mixed solution is colorless, it means that the RV value of the test solution is greater than or equal to the RV value of the reaction reagent; If the mixed solution is blue, it means that the RV value of the test solution is less than the RV value of the reaction reagent; If the mixed solution is dark, it means that the RV value of the test solution is much smaller than the RV value of the reaction reagent.

3. the semi-quantitative rapid determination method of RV value of chemical gold plating solution according to claim 1, is characterized in that: The measurement range and accuracy of the reaction reagents can be flexibly adjusted by adjusting the concentration and addition amount of each reagent.

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