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Non-chromium treatment fluid for preparation of corrosion-resistant oxidation film on magnesium alloy surface and method of use thereof

A corrosion-resistant, magnesium alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of low film-forming efficiency, and achieve the effects of less environmental pollution, good adhesion, and long-term use of the solution

Inactive Publication Date: 2008-07-23
广州市宏盈机械设备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-temperature, high-efficiency, low-temperature, high-efficiency oxide film that can not only effectively solve the problem of low film-forming efficiency of the current chromium-substituting treatment solution, but also provide an excellent corrosion-resistant oxide film on the surface of the magnesium alloy in order to solve the shortcomings of the prior art. , a chromium-free surface treatment solution with rapid film formation at room temperature

Method used

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  • Non-chromium treatment fluid for preparation of corrosion-resistant oxidation film on magnesium alloy surface and method of use thereof

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Embodiment 1

[0028] After the solution of the present invention is prepared, it needs to be stirred rapidly under the air, so that the solution can fully react. During chemical conversion treatment, the micro-cathode and micro-anode on the surface of the magnesium alloy undergo an electrochemical reaction. Among them, there are micro-anodes and micro-cathodes on the surface of the magnesium alloy in the electrolyte, the anode: the α phase with a relatively negative potential, and the cathode: a metal with a relatively positive potential The second phase of the compound is the β phase. The electrochemical reaction of micro-cathode and micro-anode on the surface of the magnesium alloy leads to a local region with a higher pH value on the surface of the magnesium alloy sample, where hydroxide precipitates are deposited.

[0029] The reaction of conversion film formation on the surface of magnesium alloy can be expressed as follows:

[0030] Microanodic reaction on magnesium alloy surface:

...

Embodiment 2

[0063] The difference between this embodiment and the above-mentioned embodiment is that the AZ63 magnesium alloy is subjected to the same pretreatment as described in the embodiment 1, and then placed in the chemical compound conversion solution for treatment. Ce salt 12g·L -1 , Potassium permanganate 1.5g L -1 , Potassium perchlorate 0.3g L -1 , strontium chloride 1.0g·L -1 , boric acid 5g·L -1 , Phytic acid 0.2g L -1 , Sodium dodecylbenzenesulfonate wetting agent 0.6g L -1 , the temperature is room temperature, and the treatment time is 3 minutes; after the reaction is completed, rinse with deionized water, dry naturally, and store in a dry place. The surface of the treated AZ63 magnesium alloy forms a layer of golden yellow conversion film with ideal corrosion resistance, which shows that it has passed the 96-hour neutral salt spray test (ASTM B117), reaching 8 grades.

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Abstract

The invention discloses a preparation and application method for conversion liquid of a corrosion resistant oxide film on magnesium alloy surface, which is characterized in that: the conversion liquid adopts rare-earth-containing salt, permanganate, persulphate, nitrate and perchlorate as composite oxidant, zirconium salt, vanadic salt and strontium salt as film forming promoter, boric acid, aminoacetic acid-hydrochloric acid solution as pH buffer regulator, pyridine, thiourea and derivatives, tannins, phytic acid and the salt compound as corrosion inhibitor, sodium dodecyl benzene sulfonate and dodecyl phenol polyoxyethlene ether (OP-10) as wetting agent; the conversion liquid is free from hexavalent chromium and environment-friendly; heating is not required for chemical conversion treatment, and the treatment time is 1 to 5min; composite oxide film with good corrosion resistance performance comprising rare-earth composite oxide, magnesia and manganese oxide can be rapidly prepared at on magnesium alloy surface at ambient temperature. The preparation method for conversion liquid of a corrosion resistant oxide film on magnesium alloy surface has the advantages of fast film forming, simple process, uniform film, strong corrosion resistance and less environmental pollution.

Description

technical field [0001] The invention relates to the field of surface treatment of magnesium alloys, in particular to the use of an environmentally friendly non-chromium rare earth conversion treatment solution to quickly prepare a compound chemistry based on rare earth metal oxides and manganese oxides with good corrosion resistance on the surface of magnesium alloys at room temperature conversion coating. Background technique [0002] Magnesium alloys are characterized by light weight, high specific strength, recyclability, and good casting performance. They are known as green metal structural materials in the 21st century. They have broad application prospects in aerospace, automotive, electronics, and military industries. In recent years grow at a rate of 20%. Especially due to the lightweight requirements of vehicles such as automobiles, motorcycles, bicycles, trains, etc., and the rapid development of 3C electronic products such as mobile phones, computers, MP3, camera...

Claims

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Application Information

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IPC IPC(8): C23C22/57C23C22/78C23C22/82
Inventor 陈东初
Owner 广州市宏盈机械设备有限公司
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