Method for measuring trivalent chromium in electroplating chromium solution by visual and apparatus thereof

A technology for visual inspection and electroplating of chromium, which is applied in the measurement of color/spectral properties, material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc. The problems of large systematic errors and accidental errors can achieve the effect of simple detection process, obvious effect, and cheap equipment and reagents.

Inactive Publication Date: 2009-12-09
SHANXI UNIV
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Problems solved by technology

This method is complicated to operate, the system error and accidental error are relatively large, time-consuming and labor-intensive, and requires professional analysis and operation

Method used

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  • Method for measuring trivalent chromium in electroplating chromium solution by visual and apparatus thereof

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Embodiment 1

[0013] Preparation of standard color scale colorimetric tubes: Take 6 25mL colorimetric tubes and number them sequentially from left to right; add 4.0mL of 500g / L chromic anhydride solution to each colorimetric tube respectively; add 46g / L Cr(NO 3 ) 3 Solution 0.0mL, 2.0mL, 4.0mL, 6.0mL, 8.0mL, 10.0mL, to obtain a standard color scale colorimetric tube from reddish brown to wine red, representing the concentration of trivalent chromium (g / L): 0.00, 0.01×C, 0.02×C, 0.03×C, 0.04×C, 0.05×C, where C is the concentration of chromic anhydride in the chromium plating solution;

[0014] The concentration of trivalent chromium in the chromium plating solution of an electroplating factory is detected, the concentration C of chromic anhydride in the chromium plating solution is 222.5g / L, the calculation shows that it is necessary to take the chromium plating solution V as 9.0mL, and pipette it into another In a 25mL colorimetric tube, dilute to the mark with distilled water, and compa...

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Abstract

The method and device for visually detecting trivalent chromium in electrochrome plating solution provided by the present invention are based on the colors of trivalent chromium and hexavalent chromium. Trivalent chromium, prepare six 25mL standard color scale colorimetric tubes; according to the concentration C of chromic anhydride in the electrochrome plating solution, determine the volume V of the plating solution by the formula V=2000 / C; draw the V volume with a pipette Put the chromium electroplating solution in another 25mL colorimetric tube into another 25mL colorimetric tube, add distilled water to dilute to the scale, shake it fully and evenly, compare the color with the standard color scale colorimetric tube, and calculate and determine the concentration or concentration range of trivalent chromium in the chromium electroplating solution . The device includes standard color scale colorimetric tubes, colorimetric tube racks and sample colorimetric tubes. The method and device are suitable for use in large, medium and small electroplating plants and electrochemical laboratories.

Description

Technical field: [0001] The invention relates to a method for detecting trivalent chromium, in particular to a method and a device for visually detecting trivalent chromium in an electrochrome plating solution. Background technique: [0002] Trivalent chromium is an important indicator used to detect electrochromium plating solution. The concentration of trivalent chromium in the electroplating chromium solution has a great influence on the electroplating production. When the content of trivalent chromium is too high, the conductivity of the electroplating chromium solution will decrease, and the surface of the electroplated product will not be bright; when the content of trivalent chromium is too low, The deposition rate is slow, the throwing ability of the plating solution decreases, and the surface of the electroplated product is soft and easy to peel. Therefore, it is very important to maintain a certain concentration of trivalent chromium in the electroplating chromium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78G01N21/25
Inventor 乔洁任永军双少敏董川
Owner SHANXI UNIV
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