Method for judging the level of metal chromium content on the surface of chrome-plated plate

A technology of surface metal and determination method, which is applied to measuring devices, instruments, scientific instruments, etc., can solve the problems of inability to measure the amount of chrome plating on the surface well, pollute the environment, and tedious operation, and achieve convenient and fast measurement. Effect

Active Publication Date: 2020-08-04
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain the content of chromium plating on the surface of the chrome-plated plate, the operation is cumbersome and time-consuming. The method involves hexavalent chromium, which will pollute the environment, and both sides of the steel plate participate in the electrolytic reaction. The final test result is the amount of chromium plating on both sides of the sample. The average value of chromium plating cannot be used to measure the level of chromium plating in different areas on the same sample surface

Method used

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  • Method for judging the level of metal chromium content on the surface of chrome-plated plate
  • Method for judging the level of metal chromium content on the surface of chrome-plated plate
  • Method for judging the level of metal chromium content on the surface of chrome-plated plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Judgment of the amount of chrome plating on the front and back of the chrome-plated plate

[0046] Cut the chrome-plated plate into 12cm-long and 5cm-wide chrome-plated plate samples, soak the chrome-plated plate sample in 100mL 90℃ 300g / L NaOH solution for 20min, take out the chrome-plated plate sample, rinse it three times, dry it, and remove the chrome-plated plate Chromium oxide layer on the surface of the sample.

[0047] The two sides of the chrome-plated plate sample are respectively recorded as a-side and b-side, and the jump potential ΔE of the chrome-plated plate in the range of 5cm×5cm is measured on both sides. Surface a starts from the bottom of the chrome-plated plate sample, and takes the range of 5cm in length and 5cm in width as the area to be measured. The surface of the chrome-plated plate sample is coated with silicone rubber within the range of length greater than 5cm and less than 10cm from the bottom, and sealed. Among them, there is a distance o...

Embodiment 2

[0052] The determination of the amount of chrome plating in different areas on the same surface of the chrome-plated plate.

[0053] Cut the chrome-plated plate into 7cm×5cm chrome-plated plate samples, soak the chrome-plated plate sample in 100mL 90℃300g / LNaOH solution for 20min, take out the chrome-plated plate sample, rinse it three times and dry it, then remove the chrome-plated plate sample Surface chromium oxide layer.

[0054] In the 2cm area from the top of the chrome-plated plate sample, no silicone rubber is used for conductivity. Take an area of ​​1cm×1cm from the top, middle and bottom of the board for testing, and seal other parts with silicone rubber, see image 3 , where 1, 2, and 3 are the areas of the sample to be tested, and 4 is the connection between the electrolytic clamp and the sample. The electrolysis reaction proceeds sequentially from the bottom to the top. Specifically:

[0055] 1) Soak the area to be tested at the bottom of the chrome-plated pla...

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Abstract

The invention discloses a method for judging the surface chromium metal content of a chromium-plated plate. The method comprises the following steps that: firstly, selecting a chromium-plated plate specimen; removing a chromium oxidation layer on the surface of the chromium-plated plate specimen; then, taking the chromium-plated plate specimen as an anode and a platinum wire as a cathode, carryingout constant current electrolysis in electrolyte sodium carbonate solution, recording a voltage value, marking voltage at the beginning as E1, along with electrolysis reaction, raising the voltage, subsequently, sharply increasing the voltage, when the voltage hardly changes, finishing electrolysis, finishing electrolyzing all surface metal chromium layers of the chromium-plated plate specimen, and recording voltage E2; and finally, calculating a voltage difference [Delta]E=E2-E1 before and after electrolysis to realize the semi-quantitative analysis of a chromium-plated amount of the surfaceof the chromium-plated plate. By use of the device, the measurement of the surface chromium-plated amount can be carried out on any position of the surface of the chromium-plated plate, and the distribution evenness of the surface metal chromium of the chromium-plated plate can be accurately judged.

Description

technical field [0001] The invention relates to a judging method, in particular to a judging method for the level of metal chromium content on the surface of a chrome-plated plate. Background technique [0002] Chromium-plated steel, also known as tin-free steel, is a new type of can-making material developed under the condition of reduced metal tin resources. It is a kind of electrolytic chromate treatment on the surface of the steel plate to deposit a layer of metallic chromium and chromium hydrated oxide on the surface of the steel plate. Compared with tinplate, its processing formability and mechanical strength are roughly the same as those of tinplate, while chrome plate products have the characteristics of low cost, strong adhesion, good high temperature resistance, strong sulfur resistance, etc., and are widely used in Crown caps, four-spin caps, etc. [0003] The existing chrome-plated surface coating mainly contains metal chromium layer (50~100mg / m 2 ) and chromi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/416
CPCG01N27/4161
Inventor 李江文郎丰军黄先球程鹏彭浩庞涛黄菲马颖宋建红
Owner 武汉钢铁有限公司
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