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Method for detecting passivation film of cold rolled electroplated tin steel plate

A technology of electroplating tin and passivation film, which is applied in the preparation of test samples, measuring devices, and optical testing of flaws/defects, etc. It can solve the problems of undetectable surface morphology uniformity, improve detection efficiency, and make research intuitive Effect

Inactive Publication Date: 2019-04-05
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for detecting the passivation film on cold-rolled tin-plated steel sheet, which mainly solves the technical problem that the surface morphology and uniformity of the passivation film on cold-rolled tin-plated steel sheet cannot be detected in the prior art. The method overcomes the influence of the substrate roughness of the cold-rolled tin-plated steel plate on the morphology characterization of the passive film on the tin-plated steel plate, and realizes the accurate detection of the passive film on the cold-rolled tin-plated steel plate

Method used

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  • Method for detecting passivation film of cold rolled electroplated tin steel plate
  • Method for detecting passivation film of cold rolled electroplated tin steel plate
  • Method for detecting passivation film of cold rolled electroplated tin steel plate

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Embodiment 1

[0024] Example 1, see figure 1 , figure 2 , the thickness of the cold-rolled annealed tin-plated substrate used in Example 1 is 0.2mm, the surface roughness Ra is 0.32um, the yield strength is 356MPa, the tensile strength is 402MPa, and the elongation after fracture is A 50mm 31%;

[0025] A method for detecting a passivation film on a cold-rolled electrotinned steel plate, the method comprising the following steps:

[0026] 1) Prepare the basic sample, and cut the cold-rolled annealed tin-plated substrate with a clean surface of 10mm×15mm as the basic sample;

[0027] 2) Electrotinning is performed on the basic sample to obtain an electro-tinned steel plate, and the electro-tinned steel plate is cut into 3 templates of 10 mm × 5 mm, which are respectively marked as sample 1, sample 2 and sample 3, and the electro-tinned steel plate is The thickness of the tin layer is 0.5g / dm 2 , the surface roughness Ra is 0.022um, and the tin electroplating step includes, the electropl...

Embodiment 2

[0031] Example 2, see figure 1 , image 3 , The cold-rolled annealed tin-plated substrate used in embodiment 2 is the same as embodiment 1.

[0032] A method for detecting passive film on cold-rolled tin-plated steel plate, the method comprises the following steps, step 1), step 2), step 1), step 2) and step 1) and step 2) described in Example 1 Same; also includes:

[0033] 3) Perform electrochemical passivation on sample 3, immerse sample 3 in a sodium dichromate solution with a temperature of 45° C., a concentration of 30 g / L, and a pH value of 4.4 for cathodic electrochemical passivation. Sample 3 is Cathode with a current density of 1A / dm 2 , take out sample 3 after passivation for 6s, rinse sample 3 with water and dry it;

[0034] 4) Measure sample 1 and sample 3 after passivation treatment by using a three-dimensional optical surface profiler, the measurement method is the same as the method in step 4) described in Example 1, and the average value of roughness of samp...

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Abstract

The invention discloses a method for detecting a passivation film of a cold-rolled electroplated tin steel plate, which mainly solves the technical problem that the surface morphology and the uniformity of passivation film of the cold-rolled electroplated tin steel plate cannot be detected in the prior art. The invention provides a method for detecting the passivation film of a cold-rolled electroplated tin steel plate, comprising the following steps of: 1) preparing a base sample, and cutting it into cold-rolled annealed electroplated tin substrates with surface cleaned and a size of 10 mmx15mm as base samples; 2) electroplating the base sample to obtain a electroplated tin steel plate, and cutting the electroplated tin steel plate into three pieces of 10 mmx5 mm, respectively labeled assample 1, sample 2 and sample 3; 3) passivating the sample 2 and sample 3; 4) respectively measuring the three-dimensional shape of the sample 1, the passivated sample 2, and the passivated sample 3by a three-dimensional optical surface profiler. The method for detecting passivation film of cold rolled electroplated tin steel plate realizes the accurate detection of the passivation film of the cold-rolled electroplated tin steel plate.

Description

technical field [0001] The present invention relates to a method for detecting the coating of a cold-rolled tin-plated steel plate, in particular to a method for detecting the passivation film on a cold-rolled tin-plated steel plate, in particular to a method for detecting the surface morphology of the passivation film on a cold-rolled tin-plated steel plate The method belongs to the technical field of surface characteristic analysis of cold-rolled steel sheets. Background technique [0002] Cold-rolled tin-plated steel sheet refers to a steel sheet or strip coated with pure tin on both sides. Because tinplate combines the strength and formability of steel with the corrosion resistance, weldability and aesthetics of tin, it has been widely used in the food industry, electronics, electrical equipment and other industries. For tin-plated plates, the passivation film plays a vital role, and at the same time acts as a barrier layer and a connecting layer. On the one hand, it ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/30G01N1/28G01N21/95C25D3/32C25D5/48
CPCC25D3/32C25D5/48G01B11/30G01N1/28G01N21/95
Inventor 许姣姣王洺浩穆海玲李宁
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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