Method for detecting chromium content in surface of cold rolled tin-plated steel sheet

A technology of element content and detection method, applied in the direction of material excitation analysis, thermal excitation analysis, etc., can solve the problem that the content of chromium hydroxide and chromium oxide cannot be accurately measured, achieve quality improvement, simple and easy method, and avoid measurement errors Effect

Inactive Publication Date: 2019-03-29
HEBEI IRON AND STEEL
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Problems solved by technology

This invention mainly solves the technical problem that the content of chromium hydroxide and chromium oxide in

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  • Method for detecting chromium content in surface of cold rolled tin-plated steel sheet
  • Method for detecting chromium content in surface of cold rolled tin-plated steel sheet

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with specific embodiments.

[0021] A method for detecting the content of chromium on the surface of cold-rolled tin-plated steel sheet comprises the following steps:

[0022] (1) The quality of three kinds of coatings is 2.33, 2.46 and 2.57 g / m respectively 2 The tinned plate is the sample to be tested. For sampling, two samples with a size of 3.5cm×3.5cm are continuously cut from the non-polluting and rust-free cold-rolled tinned steel plate to be tested, and one of the samples is sealed with acrylate glue. The side surface and four sides, the unsealed surface on the other side of the sample is the surface to be tested, and the two samples are respectively marked as sample 1 and sample 2; repeat this step twice, that is, take 3 parallel samples;

[0023] (2) Put sample 1 in a 300mL beaker, add 100±5mL dilute sulfuric acid solution with a concentration of 6:5 into the beaker to immerse the ...

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Abstract

The invention relates to a method for detecting the chromium content in the surface of a cold rolled tin-plated steel sheet, the method comprises the following steps of: continuously cutting two samples of a certain size on a piece of cold-rolled tin-plated steel sheets without any pollution or corrosion, respectively sealing the surface of one side and four side surfaces of the samples with a resin of high temperature resistance and acid and alkali resistance, immersing, heating and boiling one of the samples with a sulfuric acid solution, and then maintaining the temperature, to prepare a solution 1 to be tested; immersing the other sample with a mixed solution of sodium hydroxide and sodium silicate, heating and then maintaining the temperature to prepare a solution 2 to be tested; anddetermining the content of chromium element in the solution 1 and 2 to be tested by inductively coupled plasma optical emission spectrometer to calculate the content of chromium hydroxide and chromiumoxide in the surface of the sample. The method of the invention realizes the accurate detection of the total content of chromium, the content of chromium hydroxide, and the content of chromium oxidein the surface passivation layer of the cold-rolled tin-plated steel sheet, and provides conditions for the precise regulation of the passivation process of the cold-rolled tin-plated steel sheet, which is helpful for improving the surface quality of cold-rolled tin-plated steel sheet.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis on the surface of cold-rolled and coated steel sheets, and in particular relates to a detection method for the content of chromium on the surface of cold-rolled tin-plated steel sheets. Background technique [0002] Tin plate refers to a steel plate coated with a very thin layer of pure tin on the surface, which has good corrosion resistance and is mainly used as packaging materials in the food can industry and medicine. In order to improve the corrosion resistance of tinplate and effectively control the formation of SnO on the surface, passivation treatment must be carried out during the production process. In the tin plating production process, there are two types of chromate passivation and chromate-free passivation. The chromium-free passivation has not yet reached the level comparable to that of chromate passivation. Relevant studies have shown that the passivation layer formed by ...

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Application Information

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IPC IPC(8): G01N21/73
CPCG01N21/73
Inventor 戚振南任玲玲安治国刘洁杨慧贤杨晓倩郭圣洁谭胜楠
Owner HEBEI IRON AND STEEL
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