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Method for measuring contents of bismuth and lead ions in tin lead bismuth alloy electroplating solution

A measurement method and alloy electroplating technology, which is applied in the preparation of test samples, measurement of color/spectral characteristics, material analysis through observation of the influence of chemical indicators, etc., can solve the problems of bismuth and lead ion content, complex composition, etc. problems, to achieve the effect of convenient detection process, accurate detection results and low cost

Inactive Publication Date: 2015-11-04
江南工业集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The key step to obtain the coating is to accurately prepare the tin-lead-bismuth alloy electroplating solution. The composition of the tin-lead-bismuth alloy electroplating solution is complex, and it is relatively difficult to accurately measure the content of bismuth and lead ions in the electroplating solution.

Method used

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  • Method for measuring contents of bismuth and lead ions in tin lead bismuth alloy electroplating solution
  • Method for measuring contents of bismuth and lead ions in tin lead bismuth alloy electroplating solution
  • Method for measuring contents of bismuth and lead ions in tin lead bismuth alloy electroplating solution

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Embodiment 1

[0022] Embodiment 1: the mensuration of bismuth content

[0023] 1. Preparation of blank solution

[0024] a. Draw 5.00mL of the electroplating solution to be tested and place it in a 50mL volumetric flask;

[0025] b. Add 4mL of nitric acid solution (1+1), 10mL of tartaric acid solution with a concentration of 100g / L, and 5mL of ascorbic acid solution with a concentration of 100g / L into a 50mL volumetric flask;

[0026] c. Add water to dilute to the mark, shake well and set aside;

[0027] 2. Draw the working curve

[0028] a. Add 0.00mL, 0.50mL, 1.00mL, 1.50mL, 2.00mL and 2.50mL of bismuth standard solution with a concentration of 0.5mg / mL into six 50mL volumetric flasks respectively;

[0029] b. Add 4mL nitric acid solution (1+1), 10mL tartaric acid solution with a concentration of 100g / L and 10.00mL thiourea solution with a concentration of 50g / L in turn into 6 volumetric flasks;

[0030] c. Add water to dilute to the mark and shake well;

[0031] D, at the 465nm wave...

Embodiment 2

[0040] Embodiment 2: the mensuration of lead content

[0041] 1. Draw 20.00mL of the electroplating solution to be tested and place it in a 250mL conical flask;

[0042] 2. Add 1mL hydrogen peroxide (30%), 10.00mL EDTA-2Na standard solution with a concentration of 0.05mol / L, 50mL water, and 2g ammonium fluoride into a 250mL Erlenmeyer flask in sequence, and shake well;

[0043] 3. Add 30mL of hexamethylenetetramine solution with a concentration of 300g / L to adjust the pH value of the solution in the Erlenmeyer flask to 5-6;

[0044] 4. Add 3 drops of xylenol orange indicator solution with a concentration of 5g / L in the Erlenmeyer flask, and titrate with a zinc standard titration solution with a concentration of 0.03mol / L until the solution turns red and does not fade in 30s as the end point;

[0045] 5. Calculation of lead content

[0046] The lead content is calculated according to the following formula:

[0047] C B = ...

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Abstract

The invention relates to a method for measuring contents of bismuth and lead ions in a tin lead bismuth alloy electroplating solution. According to the method, bismuth and thiourea react in 0.4 mol / L-1.2 mol / L of a nitric acid medium to generate a soluble yellow complex, interference of lead is eliminated with tartaric acid, interference of ferric ions is eliminated with ascorbic acid, and the content of bismuth in an electroplating solution is measured by a spectrophotometric method; and Sn<2+> is oxidized into Sn<4+> by the use of hydrogen peroxide in an acid solution, excessive EDTA-2Na complex bismuth, lead and the like are added, tin is screened with ammonium fluoride, a hexamethylenetetramine solution is added to adjust pH value of the solution to 5-6, xylenol orange is used as an indicator, back titration is carried out with a zinc standard titration solution, the content of lead in the electroplating solution is calculated according to the quantity of EDTA-2Na and the zinc standard titration solution, and determination of bismuth interference with lead is deducted during the calculation. The determination method is simpler, the detection process is faster, more convenient and more environmentally-friendly, expense cost is lower, and detection results are more accurate.

Description

technical field [0001] The invention relates to a method for determining the content of bismuth and lead ions in a tin-lead-bismuth alloy electroplating solution, belonging to the field of electroplating solution analysis and testing. Background technique [0002] The tin-lead-bismuth alloy electroplating layer is a new type of coating with good whisker resistance, low temperature resistance, corrosion resistance and good solderability, which can ensure the use requirements of the product in a special environment and improve the long-term storage reliability of the product. The national invention patent of "Tin-Lead-Bismuth Alloy Coating" with the patent number of 02120839.5 and the "WJ20004-2011 Tin-Lead-Bismuth Alloy Coating Specification" issued on July 19, 2011, the People's Republic of China Armament Industry Standard and other documents indicate that tin-lead Bismuth alloy electroplating layer is a kind of coating with good application prospect. The key step to obtain...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/78G01N1/38
Inventor 许自强赵义斌任志忠谭琳曹艳韩志坚
Owner 江南工业集团有限公司
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