Determination method for free sulfite in cyanide-free gold plating solution

A technology for measuring sulfite radicals, which is applied in the direction of chemical analysis by titration, can solve problems such as process abnormalities, achieve good reproducibility, low cost, and broad application prospects

Pending Publication Date: 2022-03-04
CHENGDU HIWAFER SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But what detect in the detection method of sulfite content in the electroplating gold solution at present is the whole sulfite content in the solution, therefore, if can develop a kind of concentration that can accurately measure free state sulfite in the cyanide-free gold-plating solution, Timely regulation of the concentration of free sulfite will become an important means to avoid the abnormal occurrence of cyanide-free electroplating solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Step 1: Prepare 5% soluble starch solution

[0050] Prepare a 5% soluble starch solution by using analytically pure soluble starch, that is, add 50 mL of deionized water to a 100 mL beaker, place it on a heating plate and heat it to 80°C, and set aside. Take another 100mL beaker and weigh 2.5g of soluble starch on a high-precision electronic balance, then add the prepared 80°C deionized water into the beaker containing the soluble starch, stir and dissolve with a glass rod, and get ready.

[0051] Step 2: Prepare 37% hydrochloric acid solution for commercial purchase

[0052] Use analytically pure hydrochloric acid, the concentration of which is 37% hydrochloric acid purchased in the laboratory.

[0053] Step 3: Prepare the iodine standard solution with a concentration of 0.05mol / L

[0054] Use analytically pure 0.05mol / L iodine standard solution, the iodine standard solution purchased by the laboratory that meets the experimental requirements.

[0055] Step 4: Prepa...

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PUM

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Abstract

The invention provides a method for measuring free sulfite in a cyanide-free gold plating solution, which comprises the following steps: detecting the total sulfite concentration by iodometry, then measuring the gold concentration in a sample to be measured by an analytical instrument, and calculating the concentration of the free sulfite according to a formula. The determination method is simple, rapid, low in cost, feasible in technology, reasonable in economy and wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of measuring sulfite content, in particular to a method for measuring free sulfite in a cyanide-free gold plating solution. Background technique [0002] Precious metal plating has developed rapidly since its development. Due to the magnificent color and good conductivity of gold plating, low and stable contact resistance, good stability and high corrosion resistance, gold electroplating is widely used in jewelry, watches, handicrafts and electronic components and other fields. Electroplated gold alloys can not only obtain a variety of luster to meet people's needs for decorative appearance, but also improve the hardness and wear resistance of the coating, so they are favored by people. [0003] Electroplating gold is generally plated in a cyanide-free bath. The resulting coating is not only excellent in performance and beautiful in appearance, but also improves the mechanical properties of the material sur...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 付梦婷朱洪辉江义武
Owner CHENGDU HIWAFER SEMICON CO LTD
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