General phosphating agent

A phosphating agent, phosphoric acid technology, applied in the direction of metal material coating process, can solve the problems of large environmental pollution, poor versatility, and difficult to treat production wastewater, and achieve the effects of reducing energy consumption, easy control, and fine crystallization

Inactive Publication Date: 2012-10-10
CHONGQING RONGSHI METAL SURFACE TREATMENT AGENT
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  • Abstract
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Problems solved by technology

[0003] The phosphating agent currently used is a single steel or aluminum alloy material. Aluminum alloy and galvanized parts are treated with chromium phosphating or passivation,

Method used

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Embodiment

[0024] The embodiment of a kind of general phosphating agent described in the present invention, comprises following composition: zinc oxide, nickel nitrate, manganese carbonate, phosphoric acid, nitric acid, fluosilicic acid, additive, and water.

[0025] The principle of phosphating film formation is as follows:

[0026] Macha (Zeng Hualiang, Yang Jiachang "Electrolysis and Chemical Conversion Film", Light Industry Press, 1983, P205-206) believes that phosphating is a typical local reaction, which is an electrochemical reaction in nature.

[0027] (1) Iron is corroded and dissolved by phosphoric acid on the anode of the microbattery: Fe→Fe 2+ +2e;

[0028] (2) Hydrogen discharge on the cathode: 2H + +2e→H 2 ↑;

[0029] (3) Due to the H at the metal-solution interface + Descending, the reaction proceeds to the right:

[0030] 2Me II (H 2 PO 4 ) → Me 3 II (PO 4 ) 2 ↓+4H 3 PO 4 .

[0031] Generated Zn 2 Fe(PO 4 ) 2 4H 2 O is deposited in the cathode area, an...

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Abstract

The invention relates to the technical field of surface treatment technologies of metal materials and discloses a general phosphating agent which is suitable for surface treatment of metal materials such as steel, aluminium, zinc and the like. The general phosphating agent contains the following components: zinc oxide, nicdel nitrate, manganese carbonate, phosphoric acid, nitric acid, fluosilicic acid, an additive and water. The invention aims to provide the general phosphating agent with good versatility. The general phosphating agent can be widely used in surface treatment of metal such as steel, aluminium, zinc and the like and can be used to raise anticorrosion performance of metal surface.

Description

technical field [0001] The invention relates to the technical field of surface treatment of metal materials, in particular to a general phosphating agent suitable for surface treatment of metal materials such as steel, aluminum and zinc. Background technique [0002] As industries such as automobiles, motorcycles, and home appliances have higher requirements for product appearance and weather resistance, pre-treatment of metal surfaces is particularly important. In order to improve the corrosion resistance of metal parts, galvanized steel sheets are increasingly used as automobile body materials. In addition, in order to reduce the weight of the car body, the use of aluminum is also increasing, such as aluminum auto parts-steel rings, bumpers, heat dissipation tube etc. Due to the galvanic effect, composite metal parts are more prone to corrosion, so the requirements for their coating are also higher. The phosphating treatment of composite metal parts, due to the insulatio...

Claims

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Application Information

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IPC IPC(8): C23C22/36
Inventor 曾凡强
Owner CHONGQING RONGSHI METAL SURFACE TREATMENT AGENT
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