Color passivated galvanized steel plate and manufacturing method thereof

A technology of galvanized steel sheet and production method, which is applied in the coating process of metal materials, etc., can solve the problems of carcinogenicity, hexavalent chromium is highly toxic, and teratogenicity-induced genes, etc., and achieves improved corrosion resistance, environmentally friendly technology, and good decoration sexual effect

Active Publication Date: 2014-02-12
CHANGSHU HUAYE STEEL STRIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, hexavalent chromium is highly toxic and has ...

Method used

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  • Color passivated galvanized steel plate and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0037] The oxidizing agent, Cr 3+ Add salt, complexing agent, film-forming accelerator, and salt-spray resistant additives into pure water in sequence according to the formula ratio, and dissolve them completely under stirring. The specific content is: Cr 3+ Salt: 15-30g / L, complexing agent: 15-25 g / L, oxidizing agent: 20-30 g / L, salt spray resistance additive: 5-15 g / L, film-forming accelerator: 3-10 g / L L. Then adjust the pH to 2.0-3.5 with acid. The prepared trivalent chromium passivation solution is plated on the surface of galvanized steel sheet at room temperature by roller coating method, and the speed ratio of the coating roller of the roller coater and the steel strip is adjusted to 0.6-0.9, and the obtained passivation film is light blue With rainbow colors. The galvanized steel sheet after passivation cleaning enters the drying tunnel at 65-70°C for drying and aging.

Embodiment approach 2

[0039] The oxidizing agent, Cr 3+ Add salt, complexing agent, film-forming accelerator, and salt-spray resistant additives into pure water in sequence according to the formula ratio, and dissolve them completely under stirring. The specific content is: Cr 3+ Salt: 15-30g / L, complexing agent: 15-25 g / L, oxidizing agent: 20-30 g / L, salt spray resistance additive: 5-15 g / L, film-forming accelerator: 3-10 g / L L. Then adjust the pH to 2.0-3.5 with acid. The prepared trivalent chromium passivation solution is plated on the surface of galvanized steel sheet at room temperature by roller coating method, and the speed ratio of the coating roller of the roller coater and the steel strip is adjusted to 1.0-1.2, and the obtained passivation film is light green With rainbow colors. The galvanized steel sheet after passivation cleaning enters the drying tunnel at 70-75°C for drying and aging.

Embodiment approach 3

[0041] The oxidizing agent, Cr 3+ Add salt, complexing agent, film-forming accelerator, and salt-spray resistant additives into pure water in sequence according to the formula ratio, and dissolve them completely under stirring. The specific content is: Cr 3+ Salt: 15-30g / L, complexing agent: 15-25 g / L, oxidizing agent: 20-30 g / L, salt spray resistance additive: 5-15 g / L, film-forming accelerator: 3-10 g / L L. Then adjust the pH to 2.0-3.5 with acid. The prepared trivalent chromium passivation solution is plated on the surface of galvanized steel sheet at room temperature by roller coating method, and the speed ratio of the coating roller of the roller coater and the steel strip is adjusted to 1.5, and the obtained passivation film is light yellow with iridescence . The galvanized steel sheet after passivation cleaning enters the drying tunnel at 70-75°C for drying and aging.

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Abstract

The invention discloses a manufacturing method of a color passivated galvanized steel plate. The manufacturing method comprises the following steps: plating a well prepared trivalent chromium passivation solution on the surface of a galvanized steel plate at normal temperature by adopting a roller coating method; passivating and then forming a layer of thin and dense thin film, wherein the layer of oxide film existing independently can separate metal from outside and enable the metal to be in a passivated state. The passivated films with different colors can be obtained according to different speed ratios of a coating roller of a roller coating machine to a steel strip. The color of the passivated film is bright and less prone to changing, the formed film is uniform and less prone to falling off, the corrosion resistance performance can achieve and even be better than that achieved by a traditional hexavalent chromium passivation process, and the time of enabling neutral salt mist to resist white rust is more than 120h.

Description

technical field [0001] The invention relates to the field of decorative material processing, in particular to a colored passivated galvanized steel sheet and a manufacturing method thereof. Background technique [0002] Galvanized steel sheets are widely used in industries such as automobiles, building materials, and household appliances. Compared with the steel substrate, the galvanized layer is an anodic coating. It not only has a mechanical protection effect on the substrate, but more importantly, it has an electrochemical protection effect. However, since zinc is in the IIB group element of the periodic table, its chemical properties are relatively active, and its surface is easy to corrode and produce white rust in an atmosphere with a humidity higher than 70%. In order to slow down the formation of white rust, the surface of the galvanized layer is usually passivated to form a layer of chromate film with high chemical stability to improve its corrosion resistance. Pa...

Claims

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Application Information

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IPC IPC(8): C23C22/06
Inventor 李丽陆卫明王海英姚天宇
Owner CHANGSHU HUAYE STEEL STRIP
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