Chromium-free silicon passivation solution for passivating aluminum or aluminum alloy surface as well as preparation and using methods

A technology of aluminum alloy surface and passivation solution, applied in the direction of metal material coating process, etc., can solve the problems of high price, low cost performance, weak bonding strength, etc.

Inactive Publication Date: 2014-12-24
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pure silane film has weak bonding strength at the silane film/metal interface, and mostly uses silane couplin

Method used

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  • Chromium-free silicon passivation solution for passivating aluminum or aluminum alloy surface as well as preparation and using methods
  • Chromium-free silicon passivation solution for passivating aluminum or aluminum alloy surface as well as preparation and using methods
  • Chromium-free silicon passivation solution for passivating aluminum or aluminum alloy surface as well as preparation and using methods

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Embodiment Construction

[0009] The technical scheme of the present invention is as follows:

[0010] A chromium-free silicon passivation solution for the passivation of aluminum or aluminum alloy surfaces. The passivation solution is based on a silane coupling agent as the main agent, TEOS as an auxiliary agent, and inorganic salts of cobalt, zirconium and / or titanium Or the organic alkoxide aqueous solution is the hydrolysis accelerator, and the organic corrosion inhibitor is added and prepared by reaction;

[0011] The organic corrosion inhibitor is sodium dodecylbenzene sulfonate or sodium dodecyl sulfonate.

[0012] According to the present invention, the method for preparing the above-mentioned chromium-free silicon passivation solution includes the following steps:

[0013] (1) Add the silane coupling agent and TEOS to the methanol aqueous solution or the ethanol aqueous solution, and stir evenly to obtain solution A; the volume ratio of silane coupling agent: TEOS: water: (methanol or ethanol) is 1: (...

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Abstract

The invention relates to a chromium-free silicon passivation solution for passivating an aluminum or aluminum alloy surface, as well as preparation and using methods. The chromium-free silicon passivation solution is prepared by taking a silane coupling agent as a main agent, taking TEOS (tetraethyl orthosilicate) as an auxiliary agent, taking an inorganic salt or organic alkoxide acqueous solution of cobalt, zirconium, titanium and the like as a hydrolysis accelerator and adding an organic corrosion inhibitor. The passivation solution is free of chromium, fluorine or other toxic substances, a preparation process is simple, low in cost and suitable for industrial production, can be used instead of a chromate process, and has a wide application prospect, and a conversion coating after passivation is excellent in corrosion resistance.

Description

Technical field [0001] The invention belongs to the field of metal surface treatment, and specifically relates to a chromium-free silicon-based passivation solution for the surface passivation of aluminum or aluminum alloy, and a preparation and use method. Background technique [0002] Aluminum and aluminum alloy materials have a wide range of applications in the fields of construction, chemistry and chemical engineering, aerospace, machinery and electronics, and transportation. A thin oxide film can be formed on the surface of this type of material in the air, but this film is still prone to severe corrosion in various corrosive media, seawater and atmospheric environments, and cannot effectively protect aluminum and aluminum alloy products. [0003] The surface of aluminum and aluminum alloy is prone to pitting corrosion, intergranular corrosion, stress corrosion cracking and spalling corrosion, etc. Therefore, the surface of aluminum and aluminum alloy products must be treated ...

Claims

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Application Information

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IPC IPC(8): C23C22/56
Inventor 刘少杰张建赵玉萍李磊贾明岳韩佳佳
Owner SHANDONG UNIV
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