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Method for evaluating blackening tendency of zinc-aluminum-magnesium coated steel plate

A coated steel plate and evaluation method technology, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of unsatisfactory appearance of the car body, black reference basis of difficult-to-zinc-aluminum-magnesium-coated steel plates, etc., so as to avoid making the car body and ensure the surface Quality, accurate evaluation of the effect

Active Publication Date: 2021-06-25
SHOUGANG CORPORATION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the evaluation results of the blackening tendency of this damp heat test are often far from the actual blackening results. Guiding production based on this result may lead to unsatisfactory appearance of the produced automobile body, which is difficult to be used as a reference for the blackening of zinc-aluminum-magnesium-coated steel sheets in accordance with

Method used

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  • Method for evaluating blackening tendency of zinc-aluminum-magnesium coated steel plate

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Experimental program
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Embodiment approach

[0044]As an implementation manner of the embodiment of the present invention, the non-oxidizing acidic solution is any one of the following: dilute hydrochloric acid, phosphoric acid, glycine acid solution, and ammonium chloride solution. Because some dilute acids are oxidizing, they will seriously interfere with the removal effect of the surface oxide film. Therefore, the present invention uses a non-oxidizing acidic solution. This acidic solution can be an acid solution or a salt, including but not limited to any of the following: One: dilute hydrochloric acid, phosphoric acid, glycine solution, ammonium chloride solution, citric acid.

[0045] As an implementation manner of the embodiment of the present invention, the drying is carried out by blowing the rinsed zinc-aluminum-magnesium-coated steel sheet with an airflow at a temperature of 30-40° C. at a rate of ≥0.1 m / s.

[0046] The drying air flow is to speed up the evaporation of deionized water and eliminate residual mo...

Embodiment 1-6 and comparative example 1-6

[0057] Embodiment 1-6 and comparative example 1-6 provide a kind of blackening tendency evaluation method of zinc-aluminum-magnesium coated steel plate, comprising the following steps:

[0058] (1) Soak the zinc-aluminum-magnesium-coated steel sheet in an acidic solution for a period of time, then rinse it with deionization, and then dry it with a dry air flow; the contents of magnesium and aluminum in the coating of the zinc-aluminum-magnesium-coated steel sheet are shown in the table , and the rest are Zn and unavoidable impurities;

[0059] (2) The surface brightness of the zinc-aluminum-magnesium-coated steel plate after the measurement step (1) is L0;

[0060] (3) Laminating the zinc-aluminum-magnesium-coated steel sheets treated in step (1), and placing them in a hot and humid environment under a constant pressure perpendicular to the steel sheets for storage for a period of time;

[0061] (4) the surface brightness of the zinc-aluminum-magnesium-coated steel plate afte...

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Abstract

The invention relates to a method for evaluating the blackening tendency of a zinc-aluminum-magnesium coated steel plate, and belongs to the technical field of coating evaluation. The method comprises the following steps: carrying out oxidation film removal treatment on a zinc-aluminum-magnesium coated steel plate to obtain a stable zinc-aluminum-magnesium coated steel plate; measuring the surface brightness L0 of the stable zinc-aluminum-magnesium coated steel plate; carrying out a damp-heat test on the stable zinc-aluminum-magnesium coated steel plate; measuring the surface brightness L1 of the stable zinc-aluminum-magnesium coated steel plate after the damp-heat test; subtracting the L1 from the L0 to obtain a brightness variation [delta]L; and evaluating the blackening tendency of the zinc-aluminum-magnesium coated steel sheet by using the [delta]L. By using the evaluation method disclosed by the invention, the blackening condition of the zinc-aluminum-magnesium coated steel plate can be accurately predicted, the use of the zinc-aluminum-magnesium coated steel plate is guided, and the problem of poor appearance quality after painting caused by using the blackened zinc-aluminum-magnesium coated steel plate for producing an automobile body is avoided.

Description

technical field [0001] The invention belongs to the technical field of coating evaluation, and in particular relates to a method for evaluating blackening tendency of a zinc-aluminum-magnesium coated steel plate. Background technique [0002] Zinc-aluminum-magnesium coated steel sheet can also be called hot-dip galvanized aluminum-magnesium alloy coated steel sheet. Because it adds aluminum and magnesium elements to traditional hot-dip galvanized steel sheet, it has better corrosion resistance than traditional hot-dip galvanized steel sheet. , can be widely used in the automobile industry, electrical industry and construction industry. The zinc-aluminum-magnesium alloy coating generally contains 0.8% to 13% Al and 0.2% to 4% Mg elements, and the balance is Zn and other unavoidable impurity elements. Compared with the pure zinc coating of the traditional hot-dip galvanized steel sheet, the surface of this zinc-aluminum-magnesium-coated steel sheet is prone to darkening durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
CPCG01N17/006
Inventor 朱国森商婷蒋光锐李研滕华湘王保勇刘广会王松涛张亮徐呈亮王海全
Owner SHOUGANG CORPORATION
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