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A method for detecting corrosion active points on the surface of low-tin cold-rolled tin-plated steel sheets

A technology of electroplating tin and active points, applied in the field of chemical detection, it can solve the problems of high resolution and accuracy, and the inability to detect active points of surface corrosion, achieve good accuracy and reproducibility, shorten the conventional test time and test speed quick effect

Active Publication Date: 2021-07-09
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of low-tin content cold-rolled tin-plated steel plate surface corrosion active point detection reagent, provide the method for detecting the low-tin content cold-rolled tin-plated steel plate surface corrosion active point method, solve existing low tin content cold-rolled tin-plated steel plate surface corrosion active point detection reagent. The technical problem that the corrosion active point on the surface of the rolled tin-plated steel plate cannot be detected, the resolution and accuracy of the detection by the reagent of the present invention are high

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] Example 1, a reagent for detecting active spots of corrosion on the surface of a low tin content cold-rolled tin-plated steel sheet, including a color-developing solution and a color-fixing solution, the composition of the color-developing solution is: 25 g / L of sulfuric acid, 0.5 g / L of citric acid, Organophosphoric acid 10g / L, OP-101g / L, the balance is water; the composition of color fixing solution is: potassium ferricyanide 5g / L, phenol 0.2g / L, cetyl ammonium bromide 0.5g / L, Ethanol 30mL / L, the balance is water.

[0029] A method for preparing a reagent for detecting corrosion active points on the surface of a low-tin-amount cold-rolled tin-plated steel sheet, comprising the following steps:

[0030] 1) Use a water bath to heat the above-mentioned color-forming solution and color-fixing solution to 30-70°C respectively,

[0031] 2) According to the volume ratio of chromogenic solution: color-fixing solution of 1:1, mix to obtain a mixed solution, and cool the mixed...

Embodiment 2

[0036] Embodiment 2, the composition and preparation method of the reagent of embodiment 2 are the same as embodiment 1, and the sample size of the cold-rolled electrotin-plated steel plate used in embodiment 2 is 25 * 40cm, and the tin layer thickness of cold-rolled electrotin-plated steel plate is 2.0g / m 2 ;

[0037] A method for detecting corrosion active points on the surface of low-tin cold-rolled tin-plated steel sheets by using the above-mentioned reagents, comprising the following steps:

[0038] 1) Paste the white paper on the surface of the cold-rolled tin-plated steel plate sample, spray the reagent on the white paper on the surface of the cold-rolled tin-plated steel plate sample, and control the spraying amount of the reagent to 5mL / dm 2 ;

[0039] 2) After 6 minutes, remove the white paper from the surface of the cold-rolled tin-plated steel plate sample, blow dry the white paper, observe and record the size, quantity, and color development time of the colored...

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PUM

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Abstract

The invention discloses a reagent for detecting corrosion active points on the surface of low-tin-content cold-rolled electrotin-plated steel sheets, which solves the technical problem that the surface corrosion active points of low-tin-content cold-rolled electrotin-plated steel sheets cannot be detected. A reagent for detecting corrosion active points on the surface of low-tin cold-rolled tin-plated steel sheets, including a color-developing solution and a color-fixing solution, is characterized in that the color-developing solution consists of: acid 5‑100g / L, corrosion inhibitor 0.5‑ 25g / L, polyether surfactant 0.001‑2g / L, the balance is water; the color fixing solution consists of: color developer 0.001‑10g / L, fixative 0.05‑5g / L, ethanol 10‑100mL / L, the balance is water. The invention is sensitive to the color development of corrosion active sites on the surface of the low-tin-amount tinplate, and has strong selectivity. The method of the invention is simple in operation and fast in detection speed, and satisfies the on-site quality control of low-tin-amount tinned products.

Description

technical field [0001] The invention relates to a reagent for detecting corrosion resistance of a cold-rolled tin-plated steel plate, in particular to a reagent for detecting corrosion active points on the surface of a low-tin-content cold-rolled tin-plated steel plate, and belongs to the technical field of chemical detection. Background technique [0002] Low-tin cold-rolled tin-plated steel sheet (LTS) means that the thickness of the tin layer is less than 2.8g / m 2 electroplated tin plate. In the performance testing of electro-tinned steel sheets, there are three main methods involving the evaluation of the corrosion resistance of tinned sheets, namely porosity method (PHG), iron dissolution method (ISV) and alloy coupled current (ATC). However, ISV and ATC mainly target 5.6g / m 2 Above coating thickness, PHG is mainly aimed at 2.8g / m 2 The following coatings can evaluate the macroscopic corrosion resistance of the product very well, but they cannot detect some abnormal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00
CPCG01N17/006
Inventor 王志登穆海玲刘洪闫秉昊
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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