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Detection method for weight of chromium-free passivation film on tinplated steel board

A technology of chromium-free passivation and tin-plated steel sheet, which is used in the detection of the film weight of the passivation film and the detection of the film weight of the chromium-free passivation film of the tin-plated steel sheet, which can solve the problem that the film weight of the chromium-free passivation film cannot be accurately measured, etc. problem, to achieve the effect of high degree of detection automation, easy operation and high accuracy

Inactive Publication Date: 2017-05-31
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for detecting the film weight of chromium-free passivation film on tin-plated steel plate, which mainly solves the technical problem that the film weight of chromium-free passivation film on tin-plated steel plate cannot be accurately measured

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  • Detection method for weight of chromium-free passivation film on tinplated steel board
  • Detection method for weight of chromium-free passivation film on tinplated steel board

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Embodiment Construction

[0017] A method for detecting the weight of a chromium-free passivation film on a tin-plated steel plate, comprising the following steps:

[0018] 1) Cut the surface area to 25cm 2 For the tin-plated steel sample to be tested, seal the edge of the sample with acid-resistant tape and place it in a 250ml beaker, inject 40ml of dilute sulfuric acid solution with a volume concentration of 1:11 into the beaker (the volume ratio of analytically pure sulfuric acid to water is 1:11 ), use a model SC-404, power 2.4KW electric heating plate to heat the dilute sulfuric acid solution in the boiling beaker for 100S, take out the sample from the solution, transfer it to a 100ml volumetric flask after the solution is cooled to 20°C, and dilute it to the mark with water , and shake well to obtain the solution to be tested.

[0019] 2) Use the model iCAP630 inductively coupled plasma emission spectrometer produced by American Thermoelectric Company to measure the titanium spectral intensity I...

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Abstract

The invention relates to a detection method for weight of a chromium-free passivation film on a tinplated steel board and mainly solves the technical problem that the weight of the chromium-free passivation film on the tinplated steel board cannot be measured accurately. The method includes the steps of: 1) cutting a test piece in certain area and sealing the edges with an acid-resistant sealing material; 2) placing the test piece in a beaker and adding a dilute sulfuric acid solution, and heating and boiling the dilute sulfuric acid solution for 90-120 s; 3) taking the test piece out, and moving the solution into a 100 ml volumetric flask after the solution is cooled to 15-25 DEG C, diluting the solution to scale by water and shaking the volumetric flask to obtain a to-be-detected solution; and 4) measuring the spectral intensity of titanium in the to-be-detected solution by an inductive coupling plasma emission spectrometer and calculating the weight of the chromium-free passivation film on the test piece. The method is high in accuracy of detection data, has simple operations and low labor intensity, and satisfies accurate measurement on the weight of the chromium-free passivation film on the tinplated steel board.

Description

technical field [0001] The invention relates to a method for detecting the film weight of a passivation film, in particular to a method for detecting the film weight of a chromium-free passivation film on a tin-plated steel plate, and belongs to the technical field of chemical analysis on the surface of a cold-rolled steel plate. Background technique [0002] Tinplate (commonly known as tinplate) refers to a steel plate coated with a thin layer of metal tin on the surface. It has good corrosion resistance and is mainly used in food canning industry, chemical paint, medicine and other packaging materials. In order to improve the corrosion resistance of tinplate and effectively control the formation of SnO on the surface, tinplate must be passivated during the production process. Traditional passivation is mostly hexavalent chromate passivation, although chromate passivation has The cost is low, and it can improve the corrosion resistance of tin-plated products, but chromate i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
CPCG01N21/71
Inventor 周桂海何霖胡宏卫王海军
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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