Aluminum alloy chromate-free passivation agent containing fluorescent agent as well as preparation method and use method of aluminum alloy chromate-free passivation agent

Abstract

The invention discloses an aluminum alloy chromate-free passivation agent containing a fluorescent agent as well as a preparation method and a use method of the aluminum alloy chromate-free passivation agent, and belongs to the field of metal surface treatment. The invention discloses an aluminum alloy chromium-free passivation agent containing a fluorescent agent. The aluminum alloy chromium-free passivation agent comprises the following components in percentage by weight: 30%-90% of deionized water, 1%-10% of inorganic acid, 1%-10% of a film-forming main agent, 1%-10% of the fluorescent agent, 1%-10% of an accelerant, 1%-10% of a complexing agent and 1%-10% of a corrosion inhibitor.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to an aluminum alloy chromium-free passivation agent containing a fluorescent agent and a preparation method and use method thereof. Background technique [0002] As one of the light metal materials, aluminum alloy is widely used in aerospace, transportation, construction, metal packaging and 3C electronics due to its low density, high strength, good corrosion resistance, mechanical properties and processing properties. Wide range of applications. Passivation treatment is an effective chemical treatment method to improve the anti-corrosion performance of aluminum alloys. It can form a dense protective layer of conversion coating on the surface of aluminum materials, greatly delaying the electrochemical corrosion rate of aluminum alloys, and at the same time, it can also be used for aluminum alloys. Provides excellent adhesion with subsequent coatings. The traditional aluminu...

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Problems solved by technology

Colorless conversion coatings are not easy to identify online during on-site application, and it is difficult to judge whether the upper film of the chromium-free conversion coating is complete or not, and whether there are defective areas on the upper film by visual observation. Even if there are some identification methods, it is a very localized judgment. And it will also cause damage to aluminum products (such as high-temperature calcination after cutting and sampling or dripping of acid arsine (Ⅲ) color developer)

Although the yellow conversion film is easy to identify online, for some scenes involving painting, especially for aluminum products using transparent lacquer, transparent powder or light-colored paint, it may cause color difference in appearance, thus failing to meet customer requirements

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