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Method for measuring concentration of passivation tank liquid for galvanization

A passivation tank and passivation solution technology, which is applied in the measurement of phase influence characteristics, metal material coating process, etc., can solve the problem of long test period of chemical analysis method, large measurement error, and inability to meet the 60-minute replenishment of passivation bath solution. It can achieve the effect of fast detection, high accuracy and small detection error.

Inactive Publication Date: 2013-01-16
邢台钢铁线材精制有限责任公司
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AI Technical Summary

Problems solved by technology

[0003] At present, the traditional methods of monitoring experiment of passivation bath in electroplating process are: chemical analysis method and pH value detection method, but the test cycle of chemical analysis method is long (generally a detection cycle is about 2 hours), which cannot meet the requirement of adding passivation bath solution in 60 minutes The cycle of the pH value detection method, because the passivator itself is a complex solution (nitric acid and acidic acid salt complex solution), the measurement error is large due to the interference of other acidic substances

Method used

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  • Method for measuring concentration of passivation tank liquid for galvanization
  • Method for measuring concentration of passivation tank liquid for galvanization
  • Method for measuring concentration of passivation tank liquid for galvanization

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: The method for measuring the concentration of the electroplating passivation bath adopts the following measuring steps.

[0024] (1) Configuration standard solution: Pipette 6.0, 6.5, 7.0, 7.5, 8.0ml of SurTec668 (produced by SurTec Metal Surface Treatment Technology (Hangzhou) Co., Ltd.) passivator into 5 100ml volumetric flasks, and dilute Shake at a constant volume to obtain a standard solution with the volume concentration of SurTec668 passivating agent of 6.0%, 6.5%, 7.0%, 7.5%, and 8.0% respectively;

[0025] (2) Detect the configured standard solution with a refractometer, and perform repeated measurements to determine the refractive index, and draw a curve according to the change of the refractive index at different concentrations; the concentration-refractive index change curve is as follows figure 1 As shown, the refractive index control range is 3.5~4.0;

[0026] (3) Take the passivation bath to be measured and use a refractometer to determine its refr...

Embodiment 2

[0027] Embodiment 2: The method for measuring the concentration of the electroplating passivation bath adopts the following measuring steps.

[0028] (1) Configure standard solution: mix SurTec668 and SurTec680LC (produced by SurTec Metal Surface Treatment Technology (Hangzhou) Co., Ltd.) at a volume ratio of 2:1, and pipette 3.0, 4.0, 4.5, 5.0 respectively , 6.0ml of mixed passivator into 5 100ml volumetric flasks, dilute to a constant volume and shake well. Calculate according to the concentration of the mixed passivation agent, and get the standard solution with volume concentration of 3.0%, 4.0%, 4.5%, 5.0%, 6.0% respectively;

[0029] (2) Detect the configured standard solution with a refractometer, and perform repeated measurements to determine the refractive index, and draw a curve according to the change of the refractive index at different concentrations; the concentration-refractive index change curve is as follows figure 2 As shown, the refractive index control range i...

Embodiment 3

[0031] Embodiment 3: The method for measuring the concentration of the electroplating passivation bath adopts the following measuring steps.

[0032] (1) Configuration standard solution: Pipette 6.0, 6.5, 7.0, 7.5, 8.0ml of SurTec668 passivation agent into 5 100ml volumetric flasks, dilute to a constant volume and shake well to obtain the volume concentration of 668 passivation agent respectively. 6.0%, 6.5%, 7.0%, 7.5%, 8.0% standard solution;

[0033] (2) Detect the configured standard solution with a refractometer, and repeat the measurement to determine the refractive index, and draw a curve according to the change of the refractive index at different concentrations. The concentration-refractive index change curve is as follows figure 1 Shown

[0034] (3) Measure and compare the passivation solution in the industrial production process, verify the error between the experimental value and perform numerical compensation. The supplementary method is: a. The laboratory proportions th...

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Abstract

The invention discloses a method for measuring concentration of passivation tank liquid for galvanization. The method includes steps of (1), preparing a group of standard liquids with gradient concentrations by blue-white passivators; (2), determining refractive index of the standard liquids and drawing a concentration-refractive index variation curve; and (3), determining refractive index of passivation tank liquid to be measured so as to obtain the concentration of the passivation tank liquid according to the concentration-refractive index variation curve. According to variation relation of the blue-white passivators and the refractive index, after the refractive index of the passivation tank liquid is determined, the concentration of the passivation tank liquid can be obtained quickly according to the blue-white passivator concentration-refractive index variation curve which is determined by the aid of the standard passivators. In the measurement process by the method, no reagents are needed, interference of other acid substances can be ignored, and measurement error is low. Accordingly, the method has the advantages of operational simplicity, quick measurement and high accuracy.

Description

Technical field [0001] The invention relates to a concentration detection method, in particular to a method for measuring the concentration of an electroplating passivation bath. Background technique [0002] After the workpiece is processed by electro-galvanizing, it is relied on passivation to form a surface color chromate conversion coating to improve the corrosion resistance of the product. At the same time, the quality of the bright and clear coating is also one of the indispensable indicators to meet the appearance requirements of galvanized parts. How to accurately maintain the stability of the concentration of the passivation solution through supplementation during the production process has become a key monitoring element. [0003] At present, the traditional methods of electroplating process passivation bath monitoring experiment are: chemical analysis method and pH value detection method, but the chemical analysis method has a long test cycle (usually a detection cycle o...

Claims

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Application Information

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IPC IPC(8): G01N21/41C23C22/77
Inventor 李静苗慧聪
Owner 邢台钢铁线材精制有限责任公司
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