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Method for determining quality of chromium oxide coating in chromium electroplated plate

A chromium oxide and determination method technology, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve problems such as complex operation, high investment cost, long measurement time, etc., meet the detection requirements, and measure quickly and easily , the effect of good precision

Active Publication Date: 2016-02-10
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Among the above methods, spectrophotometry is a classical chemical analysis method with high accuracy, but the method is complicated to operate, and the measurement period is long, and it takes 1.5 hours to measure a sample; Measurement method, its accuracy depends on spectrophotometry, X-ray fluorescence spectrometry equipment investment costs more expensive, need to use chemical method pretreatment and two determinations; atomic emission spectrometry belongs to the classical chemical analysis method, its accuracy and spectrophotometry Similarly, although this method is simpler than the spectrophotometric method, it also has disadvantages such as complicated operation and long measurement time.

Method used

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  • Method for determining quality of chromium oxide coating in chromium electroplated plate
  • Method for determining quality of chromium oxide coating in chromium electroplated plate
  • Method for determining quality of chromium oxide coating in chromium electroplated plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1. Electrolyte preparation: weigh 7.6 grams of Na 2 HPO 4 2H 2 O and 1.85 g NaH 2 PO 4 2H 2 O, placed in 1 liter of distilled water, the pH value of this electrolyte is about 7.1;

[0049] 2. Sample preparation: Punch a disc sample with a diameter of 57.3 mm from the operation side, middle part and transmission side of the sample plate width, such as Figure 4 Shown; use absolute ethanol to remove the oil film on the surface of the sample.

[0050] 3. Access operation of electrolytic measuring device and sample

[0051] 3.1 Put the sample into the electrolytic cell, close the push rod 6, and close the electrolytic cell.

[0052] 3.2 Two electrolytic cells are used, which are spliced ​​by two electrolytic cells 1 through connecting rods 2, and can simultaneously measure the quality of the chromium oxide coating on the front and back sides of the sample.

[0053] 3.3 The sample is closed by the sealing ring 3, and the closed area is the electrolysis area of ​​the ...

Embodiment 2

[0078] 1. Electrolyte preparation: 15.3 grams of Na 2 HPO 4 12H 2 O is dissolved in 1 liter of distilled water, and then its acidity is adjusted to be PH=7 with 10wt% sodium hydroxide solution, and this solution is the electrolytic solution of the chromium oxide coating of the electrochrome plate.

[0079] 2. Sample preparation: Punch a disc sample with a diameter of 57.3 mm from the operation side, middle part and transmission side of the sample plate width, such as Figure 4 As shown, absolute ethanol was used to remove the oil film on the surface of the sample.

[0080] 3. Access operation of electrolytic measuring device and sample

[0081] 3.1 Put the sample into the electrolytic cell, close the push rod 6, and close the electrolytic cell.

[0082] 3.2 Two electrolytic cells are used, which are spliced ​​by two electrolytic cells 1 through connecting rods 2, and can simultaneously measure the quality of the chromium oxide coating on the front and back sides of the sam...

Embodiment 3

[0108] 1. Electrolyte preparation: weigh 7.6 grams of Na 2 HPO 4 2H 2 O and 1.85 g NaH 2 PO 4 2H 2 O, placed in 1 liter of distilled water, the pH value of this electrolyte is about 7.1.

[0109] 2. Sample preparation: Punch a disc sample with a diameter of 57.3 mm from the operation side, middle part and transmission side of the sample plate width, such as Figure 4 shown. The oil film on the surface of the sample was removed with absolute ethanol.

[0110] 3. Access operation of electrolytic measuring device and sample

[0111] 3.1 Put the sample into the electrolytic cell, close the push rod 6, and close the electrolytic cell.

[0112] 3.2 Use one electrolytic cell 1 and replace another electrolytic cell with a fixed plate to measure the quality of the chromium oxide coating on the electrochrome plated plate on one side of the sample.

[0113] 3.3 The sample is closed by the sealing ring 3, and the closed area is the electrolysis area of ​​the sample.

[0114] 3.4...

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Abstract

The invention discloses a method for determining the quality of a chromium oxide coating in a chromium electroplated plate. The method comprises the following steps: 1, preparing an electrolyte; 2, preparing a sample, and removing an oil film on the surface of the sample; 3, filling an electrolysis measurement device with the sample, and setting the electrolytic current density of the chromium oxide coating in the chromium electroplated plate to be 25-50[mu]A; 4, measuring the electrolysis time and the oxidation reduction potential to obtain a time and potential relationship curve, terminating the measurement when the potential has a descending trend from ascending, and determining the electrolysis reaction termination time through an inflection point existing in the electrolysis curve; and 5, determining the quality of the chromium oxide coatings of multiple samples by using present methods, determining the electrolysis time of the chromium oxide coatings of the corresponding samples, establishing a chromium oxide coating quality electrolysis process measurement model, and reckoning the quality of the chromium oxide coating by using the electrolysis time. Compared with the prior art, the method disclosed in the invention has the advantages of good precision, no significant difference, and rapid and simple measurement.

Description

technical field [0001] The invention relates to quality evaluation of electrochrome-plated steel plates, in particular to a method for measuring the quality of chromium oxide coatings in electrochrome-plated plates. Background technique [0002] Chromium-plated steel plate is a product of cathodic reduction of cold-rolled thin steel plate in anhydrous chromic anhydride aqueous solution to form metal chromium coating and chromium hydrated oxide coating on the surface of the steel plate. Its structure has four layers: steel substrate, metal chromium coating, Chromium oxide plating and oil film. Electrochrome-plated steel sheet, referred to as chrome-plated sheet for short, also known as tin-free steel sheet, its English name is TinFreeSteel, abbreviated as TFS, it is a thin steel sheet that is used instead of tin-plated sheet without tin plating. [0003] The production cost of chrome-plated plate is lower than that of tin-plated plate, and it has the characteristics of stron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416
Inventor 张家琪朱颖张晴宗开梅王凌
Owner BAOSHAN IRON & STEEL CO LTD
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