Method for detecting content of cerous sulfate in tin-cerium alloy electroplating solution

A determination method, a technology of cerium sulfate, is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., which can solve the problems of complex operation process, error in detection results, and long detection period. , to achieve the effect of simple measurement method, low cost and convenient detection process

Inactive Publication Date: 2014-06-11
江南工业集团有限公司
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Problems solved by technology

Among the above four methods, the operation process of the first, second and third methods is more complicated, the detection period is long, and there are certain errors in the detection results; the fourth method, due to the use of HCl-HNO 3 The mixed acid is heated and oxidized to form an insoluble jelly. Add 30mL of 1+3 hydrochloric acid and heat to boiling. The jelly does not dissolve. After cooling, add the indicator. The color of the solution has no obvious change, and there is a defect of inaccurate titration.

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  • Method for detecting content of cerous sulfate in tin-cerium alloy electroplating solution
  • Method for detecting content of cerous sulfate in tin-cerium alloy electroplating solution
  • Method for detecting content of cerous sulfate in tin-cerium alloy electroplating solution

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Embodiment Construction

[0025] The present invention will be further described below with regard to specific embodiments.

[0026] A kind of assay method of tin-cerium alloy electroplating solution cerium sulfate content, it comprises the following steps:

[0027] (1) Reagent preparation

[0028] a. Perchloric acid (ρ=1.75g / mL);

[0029] b. Phosphoric acid (ρ=1.69g / mL);

[0030] c. Nitric acid (ρ=1.46g / mL);

[0031] d, ferrous ammonium sulfate standard titration solution {c[(NH 4 ) 2 Fe(SO 4 ) 2 ]=0.02mol / L}, calibration before use;

[0032] e. N-phenylanthranilic acid indicator solution (1g / L): Take 0.10 g of N-phenylanthranilic acid and dissolve it in 100 mL of sodium carbonate solution with a concentration of 2 g / L.

[0033] (2) Draw 5.00mL of the electroplating solution to be tested and place it in a 250mL Erlenmeyer flask.

[0034] (3) In the fume hood, add 5mL perchloric acid with a density of 1.75g / mL, 10mL of phosphoric acid with a density of 1.69g / mL, and 1.46g / mL in a 250mL conical...

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Abstract

The invention relates to a method for detecting a content of cerous sulfate in a tin-cerium alloy electroplating solution and belongs to the field of electroplating solution analysis technologies. The method is mainly characterized by comprising the following steps: oxidizing the electroplating solution to be detected by using perchloric acid, phosphoric acid and nitric acid with a certain concentration; with N-phenyl o-aminobenzoic acid as an indicator, detecting the content of the cerous sulfate in the tin-cerium alloy electroplating solution in a way of titrating tetravalent cerium into trivalent cerium by using an ammonium ferrous sulfate standard titration solution. The detection method has the characteristics that the detection is simple, the detection process is convenient, quick and environment-friendly and low in cost, and the detection results are accurate and coincident.

Description

technical field [0001] The invention relates to a method for measuring the content of cerium sulfate in a tin-cerium alloy electroplating solution, belonging to the technical field of electroplating solution analysis, and is particularly suitable for measuring the content of cerium sulfate in a bright tin-plated cerium alloy electroplating solution. Background technique [0002] Bright tin-plated cerium alloy has been popularized and applied in China. The co-precipitated alloy of cerium and tin can prevent the matrix copper from forming an unweldable alloy diffusion layer. The alloy has strong oxidation resistance, good chemical stability and solderability, and cerium ions also It has the function of preventing stannous oxidation and hydrolysis, and the process is stable. In the background technology, there are four methods for measuring the content of cerium sulfate in tin-cerium alloy electroplating solutions disclosed in China at present: the first is to use strong alkali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 许自强任志忠罗臻葵赵义斌蒋文松胡德意李保荣尹公晖谭琳
Owner 江南工业集团有限公司
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