Film formation method for controlling the performance of trivalent chromium chemical conversion film on the surface of hot-dip galvanized aluminum alloy coating

A technology of chemical conversion coating and hot-dip galvanizing, which is applied in hot-dip coating process, surface reaction electrolytic coating, metal material coating process, etc. High density and other problems, to achieve the effect of reducing macroscopic roughness, improving uniformity and integrity, and improving corrosion resistance

Active Publication Date: 2022-04-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these external electric field assisted film formation methods use high voltage, high current density, and low efficiency, and are prone to the presence of hexavalent chromium in the conversion film and uneven film quality when applied to the preparation of trivalent chromium chemical conversion films. question

Method used

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  • Film formation method for controlling the performance of trivalent chromium chemical conversion film on the surface of hot-dip galvanized aluminum alloy coating
  • Film formation method for controlling the performance of trivalent chromium chemical conversion film on the surface of hot-dip galvanized aluminum alloy coating
  • Film formation method for controlling the performance of trivalent chromium chemical conversion film on the surface of hot-dip galvanized aluminum alloy coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The hot-dip galvanized aluminum alloy coating samples were ultrasonically cleaned with acetone for 15 minutes, alcohol for 1 minute, and pure water for 30 seconds, and then the samples were dried at room temperature for later use.

[0040] The prepared hot-dip galvanized aluminum alloy coating sample was used as the cathode, and the platinum sheet electrode was used as the counter electrode anode, and immersed in the trivalent chromium chemical conversion diluent. After immersion for 15s, the cathodic pulse square wave potential was applied to the sample. The potential value of the pulsed square wave potential is -0.05V, the pulse width is 0.1s, the frequency is 5Hz, the duty cycle is 50%, the total pulsed square wave potential is applied for 120s, and the film forming temperature is 30°C.

[0041] The obtained product was washed with pure water for 30 seconds and then dried at room temperature to realize the regulation and control of the properties of the trivalent chr...

Embodiment 2

[0043] The hot-dip galvanized aluminum alloy coating samples were ultrasonically cleaned with acetone for 20 minutes, alcohol for 2 minutes, and pure water for 60 seconds, and then the samples were dried at room temperature for later use.

[0044] The prepared hot-dip galvanized aluminum alloy coating sample was used as the cathode, and the platinum sheet electrode was used as the counter electrode anode, and immersed in the trivalent chromium chemical conversion diluent. After immersion for 20s, the cathodic pulse square wave potential was applied to the sample. The potential value of the pulsed square wave potential is -0.05V, the pulse width is 0.2s, the frequency is 2.5Hz, the duty cycle is 50%, the total pulsed square wave potential is applied for 160s, and the film forming temperature is 40°C.

[0045] The obtained product was washed with pure water for 30 seconds and then dried at room temperature to realize the regulation and control of the properties of the trivalent ...

Embodiment 3

[0047] The hot-dip galvanized aluminum alloy coating samples were ultrasonically cleaned with acetone for 20 minutes, alcohol for 2 minutes, and pure water for 60 seconds, and then the samples were dried at room temperature for later use.

[0048] The prepared hot-dip galvanized aluminum alloy coating sample was used as the cathode, and the platinum sheet electrode was used as the counter electrode anode, and immersed in the trivalent chromium chemical conversion diluent. After immersion for 20s, the cathodic pulse square wave potential was applied to the sample. The potential value of the pulsed square wave potential is -0.10V, the pulse width is 0.2s, the frequency is 2.5Hz, the duty cycle is 50%, the total pulsed square wave potential is applied for 160s, and the film forming temperature is 40°C.

[0049] The obtained product was washed with pure water for 30 seconds and then dried at room temperature to realize the regulation and control of the properties of the trivalent ...

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Abstract

The invention proposes a film-forming method for adjusting and controlling the performance of a trivalent chromium chemical conversion film on the surface of a hot-dip galvanized aluminum alloy coating, which belongs to the field of chemical conversion film-forming technology, and can solve the problems of hexavalent chromium and film-forming quality that are prone to occur in existing film-forming methods Inhomogeneity and technical problems such as high voltage, high current density, and low efficiency used in auxiliary film formation. The film forming method includes putting the hot-dip galvanized aluminum alloy coating into the trivalent chromium chemical conversion diluent, and after standing still for a while, applying a pulsed cathode square wave potential to it to chemically convert into a film at a certain temperature, wherein the heat The galvanized aluminum alloy coating is the cathode, and the counter electrode is the anode; after the above-mentioned product is cleaned and dried at normal temperature, a trivalent chromium chemical conversion film is obtained on the surface of the hot-dip galvanized aluminum alloy coating. The invention can be applied to the structure and performance control of the trivalent chromium chemical conversion film on the surface of the hot-dip galvanized aluminum alloy coating, so as to be applied to the temporary protection of the hot-dip galvanized aluminum alloy coating.

Description

technical field [0001] The invention belongs to the technical field of chemical conversion and film formation, and in particular relates to a film formation method for regulating and controlling the performance of a trivalent chromium chemical conversion film on the surface of a hot-dip galvanized aluminum alloy coating. Background technique [0002] Hot-dip galvanized aluminum alloy coating is widely used in many fields such as construction, transportation, home appliances and decoration, and plays the role of decorating and protecting the base steel. However, in more harsh corrosive environments, the protective performance of hot-dip coatings will gradually decline. In order to further improve the durability of hot-dip galvanized steel sheets in special environments such as soil and seawater, it is necessary to carry out chemical conversion treatment on the surface. As a common pretreatment and passivation method, chemical conversion method is widely used on the surface o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/26C23C2/06C25D5/18C25D11/00
CPCC23C2/26C23C2/06C25D11/00C25D5/18
Inventor 李焰潘杰丁雅静
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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