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Electrochemical determination method of stabilizer in chemical nickel plating solution

A technology of electroless nickel plating solution and measurement method, which is applied in the field of electrochemical measurement to achieve the effect of good reproducibility and high sensitivity

Inactive Publication Date: 2015-07-22
CHANGZHOU UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, for the control and control of stabilizers in electroless nickel plating baths, the analysis of metal ions is relatively easy. For example, atomic absorption or plasma emission spectrometry can be used to directly measure lead ions and cadmium ions. However, for some organic compounds containing mercapto groups, So far, there is no effective way. In response to this problem, our research group found that by placing the gold electrode in the electroless nickel plating solution, after the gold electrode adsorbs the mercapto compound, the solution of potassium ferricyanide is used as a probe, through Detect the change of the reduction current of the potassium ferricyanide solution, and quantify the stabilizer mercapto compound in the electroless nickel plating solution

Method used

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  • Electrochemical determination method of stabilizer in chemical nickel plating solution
  • Electrochemical determination method of stabilizer in chemical nickel plating solution
  • Electrochemical determination method of stabilizer in chemical nickel plating solution

Examples

Experimental program
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Embodiment 1

[0017] The mensuration of sodium tetrathionate in the electroless nickel plating liquid of embodiment 1

[0018] Put the clean gold electrode (diameter 2mm) in the electroless nickel plating solution containing sodium tetrathionate at 25°C for 15 minutes, wash the surface of the gold electrode with deionized water, and place the gold electrode in a solution containing 5.0x10 -4 moL -1 K 3 Fe(CN) 6 and 0.1molL -1 In the solution of KCl, a saturated calomel electrode is used as a reference electrode, and a platinum wire is used as a counter electrode to form a three-electrode system. At 25°C, K 3 Fe(CN) 6 Revert to K 4 Fe(CN) 6 current.

[0019] Prepare standard solutions with sodium tetrathionate concentrations of 0, 0.1, 0.2, 0.3 and 0.4 ppm respectively. Similarly, put the clean gold electrodes (diameter 2mm) in the above standard solution of sodium tetrathionate at 25°C for 15 minutes, wash the surface of the gold electrodes with deionized water, and place the go...

Embodiment 2

[0021] The mensuration of thiourea in the electroless nickel plating liquid of embodiment 2

[0022] Put the clean gold electrode (diameter 2mm) in the electroless nickel plating solution containing thiourea at 25°C for 15 minutes, wash the surface of the gold electrode with deionized water, and place the gold electrode in a solution containing 5.0x10 -4 moL -1 K 3 Fe(CN) 6 and 0.1molL -1 In the solution of KCl, a saturated calomel electrode is used as a reference electrode, and a platinum wire is used as a counter electrode to form a three-electrode system. At 25°C, K 3 Fe(CN) 6 Revert to K 4 Fe(CN) 6 current.

[0023] Prepare standard solutions with thiourea concentrations of 0, 0.1, 0.2, 0.3 and 0.4 ppm respectively. Similarly, put clean gold electrodes (diameter 2mm) in the above-mentioned standard solution of thiourea at 25°C for 15 minutes, wash the surface of the gold electrodes with deionized water, and place the gold electrodes in a solution containing 5.0...

Embodiment 3

[0025] The mensuration of cysteine ​​in the electroless nickel plating liquid of embodiment 3

[0026]Put the clean gold electrode (diameter 2mm) in the electroless nickel plating solution containing cysteine ​​at 25°C for 15 minutes, wash the surface of the gold electrode with deionized water, and place the gold electrode in a solution containing 5.0x10 -4 moL -1 K 3 Fe(CN) 6 and 0.1molL -1 In the solution of KCl, a saturated calomel electrode is used as a reference electrode, and a platinum wire is used as a counter electrode to form a three-electrode system. At 25°C, K 3 Fe(CN) 6 Revert to K 4 Fe(CN) 6 current.

[0027] Prepare standard solutions with cysteine ​​concentrations of 0, 0.1, 0.2, 0.3 and 0.4 ppm respectively. Similarly, put the clean gold electrodes (diameter 2mm) in the above-mentioned cysteine ​​standard solution at 25°C for 15 minutes, wash the surface of the gold electrodes with deionized water, and place the gold electrodes in the solution cont...

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Abstract

The invention relates to an electrochemical determination method of stabilizer in chemical nickel plating solution, which belongs to the technical field of electrochemical determination. The method is characterized in that a gold electrode is placed into the chemical nickel plating solution to adsorb sulfhydryl compound, potassium ferricyanide solution is used as a probe, and the stabilizer sulfhydryl compound in the chemical nickel plating solution is detected by detecting the variation of reduction current of the potassium ferricyanide solution. The test method is not only high in sensitivity, but also good in reproducibility.

Description

technical field [0001] The invention belongs to the technical field of electrochemical measurement and is suitable for the measurement of mercapto-containing compounds used as stabilizers in electroless nickel plating solutions. Background technique [0002] The electroless nickel plating solution is a thermodynamically unstable system, and reduction reactions often occur outside the surface of the plated parts. When some active particles with catalytic effects are produced in the electroless nickel plating solution, violent self-sustaining reactions are likely to occur in the chemical nickel plating solution at this time. Catalytic reaction, that is, self-decomposition reaction to produce a large amount of nickel-phosphorus black powder, leading to the end of the life of the electroless nickel plating solution, causing great economic losses. [0003] Add a certain amount of highly adsorbable inorganic or organic compounds to the electroless nickel plating solution, and they...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26
Inventor 陈智栋王文昌王钰蓉光崎尚利志方广一
Owner CHANGZHOU UNIV
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