CN115679306A - Magnesium alloy surface treating agent and magnesium alloy treatment method - Google Patents
Magnesium alloy surface treating agent and magnesium alloy treatment method Download PDFInfo
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- CN115679306A CN115679306A CN202211224912.8A CN202211224912A CN115679306A CN 115679306 A CN115679306 A CN 115679306A CN 202211224912 A CN202211224912 A CN 202211224912A CN 115679306 A CN115679306 A CN 115679306A
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Abstract
The invention relates to a magnesium alloy surface treating agent and a magnesium alloy treating method. The surface treating agent comprises a first component and a second component, wherein the first component comprises 100 parts by weight of nitric acid and 5-20 parts by weight of sodium fluosilicate, and the second component comprises 100 parts by weight of solvent, 10-20 parts by weight of polyacrylic acid and 10-20 parts by weight of higher fatty acid; the mass ratio of the first component to the second component is 3-10. In the process of forming the conversion film, a plurality of small air holes can appear on the surface of the magnesium alloy, the quality of the magnesium alloy film layer can be seriously influenced by the small holes, sodium fluosilicate, polyacrylic acid and higher fatty acid are adsorbed in the small holes on the surface of the magnesium alloy, local alkalinity is formed on the surface of the magnesium alloy by adopting local sealing of the polyacrylic acid and the higher fatty acid in the small holes, so that the sodium fluosilicate participates in the formation of the conversion film, and the more compact and low-resistance conversion film is obtained.
Description
Technical Field
The invention relates to a magnesium alloy surface treating agent and a magnesium alloy treating method.
Background
Magnesium alloy is the least dense of the alloys used in modern industry and it has excellent strength to weight ratio. At present, workpieces needing weight reduction, such as airplane landing hubs, missile guiding systems, aerospace equipment, parts on satellites, engine housings, automobile parts, daily electric appliances, precise electronic instruments, notebook computer housings and the like, are all made of magnesium alloy.
With the development of chemical surface treatments, it is not generally necessary to use large amounts of environmentally harmful chemicals such as phosphorus, chromium, etc.
Chinese patent CN202110454144.4 discloses a magnesium alloy conversion film strengthening treating agent and a magnesium alloy surface treatment method, and provides the magnesium alloy conversion film strengthening treating agent which comprises the following components: 3-15 g/L of lauric acid and/or myristic acid, 3-15 g/L of oleic acid, 3-15 g/L of TX-10 emulsifier, 3-15 g/L of ethanol, 1-5 g/L of sodium hydroxide or monoethanolamine and the balance of water, a layer of protective film can be rapidly generated on the surface of the magnesium alloy conversion film, the hardness and the scratch-resistant effect of the magnesium alloy conversion film are obviously improved, meanwhile, the magnesium alloy conversion film has the fingerprint-resistant function and the corrosion-resistant effect of the magnesium alloy conversion film are improved, and meanwhile, the magnesium alloy conversion film strengthening treatment agent is chromium-free and phosphorus-free, does not contain harmful substances to a human body and is beneficial to environmental protection.
However, most of the surface treatments of aluminum alloys have only good corrosion resistance effects, but the resistance of the formed conversion coating is often high.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a magnesium alloy surface treating agent which is characterized by comprising a first component and a second component, wherein the first component comprises 100 parts by weight of nitric acid and 5-20 parts by weight of sodium fluosilicate, and the second component comprises 100 parts by weight of solvent, 10-20 parts by weight of polyacrylic acid and 10-20 parts by weight of higher fatty acid; the mass ratio of the first component to the second component is 3-10.
The polyacrylic acid has a weight average molecular weight of 500 to 2000.
The higher fatty acid is a fatty acid having 18 to 25 carbon atoms.
The mass ratio of the polyacrylic acid to the higher fatty acid is 1.
The solvent is selected from one or more of methanol, acetone and triethanolamine.
The corrosion inhibitor is selected from one or more of triethanolamine oleate, diethanolamine oleate, sodium benzoate and alkyl pyridinium chloride ammonium salt;
the wetting agent is selected from one or more of OP emulsifier, tween emulsifier and fatty alcohol-polyoxyethylene ether.
The stabilizer is selected from one or more of glycolic acid, ethylene diamine tetraacetic acid and salts thereof.
A method of processing a magnesium alloy, the method comprising the steps of:
after degreasing, washing, etching, washing and activating treatment are carried out on the magnesium alloy, the treated magnesium alloy is placed into a bath solution, the bath solution contains a magnesium alloy surface treating agent, the pH value of the bath solution is 1-2, the surface treating agent comprises a first component and a second component, the first component comprises 100 parts by weight of nitric acid and 5-20 parts by weight of sodium fluosilicate, and the second component comprises 100 parts by weight of solvent, 10-20 parts by weight of polyacrylic acid and 10-20 parts by weight of higher fatty acid; the mass ratio of the first component to the second component is 3-10, the treatment temperature is 30-60 ℃, and the treatment time is 180-420 seconds.
In the process of forming the conversion film, a plurality of small air holes can appear on the surface of the magnesium alloy, the quality of the magnesium alloy film layer can be seriously influenced by the small holes, sodium fluosilicate, polyacrylic acid and higher fatty acid are adsorbed in the small holes on the surface of the magnesium alloy, local alkalinity is formed on the surface of the magnesium alloy by adopting local sealing of the polyacrylic acid and the higher fatty acid in the small holes, so that the sodium fluosilicate participates in the formation of the conversion film, and the more compact and low-resistance conversion film is obtained. And the polyacrylic acid and the higher fatty acid have single-point adsorption groups, and the polyacrylic acid and the higher fatty acid have multi-point adsorption groups, and are matched with each other, so that a better local sealing effect is achieved.
The above-described and other features, aspects, and advantages of the present application will become more apparent with reference to the following detailed description.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.
The magnesium alloy surface treating agent is characterized by comprising a first component and a second component, wherein the first component comprises 100 parts by weight of nitric acid and 5-20 parts by weight of sodium fluosilicate, and the second component comprises 100 parts by weight of solvent, 10-20 parts by weight of polyacrylic acid and 10-20 parts by weight of higher fatty acid; the mass ratio of the first component to the second component is 3-10. Polyacrylic acid has a weight average molecular weight of 500-2000. The higher fatty acid is a fatty acid having a carbon number of 18 to 25. The mass ratio of the polyacrylic acid to the higher fatty acid is 1. The solvent is selected from one or more of methanol, acetone and triethanolamine. The corrosion inhibitor is selected from one or more of triethanolamine oleate, diethanolamine oleate, sodium benzoate and alkyl pyridinium chloride ammonium salt; the wetting agent is one or more selected from OP emulsifier, tween emulsifier and fatty alcohol-polyoxyethylene ether. The stabilizer is selected from one or more of glycolic acid, ethylenediamine tetraacetic acid and their salts.
A method of processing a magnesium alloy, the method comprising the steps of:
after degreasing, washing, etching, washing and activating treatment are carried out on the magnesium alloy, the treated magnesium alloy is placed into a bath solution, the bath solution contains a magnesium alloy surface treating agent, the pH value of the bath solution is 1-2, the surface treating agent comprises a first component and a second component, the first component comprises 100 parts by weight of nitric acid and 5-20 parts by weight of sodium fluosilicate, and the second component comprises 100 parts by weight of a solvent, 10-20 parts by weight of polyacrylic acid and 10-20 parts by weight of higher fatty acid; the mass ratio of the first component to the second component is 3-10, the treatment temperature is 30-60 ℃, and the treatment time is 180-420 seconds.
Examples
The Mcl-01 component comprises 100 parts of sodium carbonate, 50 parts of sodium silicate, 20 parts of fatty acid methyl ester ethoxylate and 30 parts of isomeric tridecanol ethoxylate.
Met-05 was 100 parts of polyacrylic acid (molecular weight 1000) and 50 parts by weight of heneicosa.
Mat-301 is a 5wt% sodium hydroxide solution.
Mch-401A is 100 parts of nitric acid and 15 parts of sodium fluosilicate
Mch-401C is 100 parts solvent, 10 parts polyacrylic acid (molecular weight 1000) and 15 parts heneico-carbonic acid.
The above are all parts by weight.
The magnesium alloy obtained by treatment has uniform appearance and is gray; according to JIS standard, 24-hour neutral salt spray experiment can reach more than grade 9; the film layer has low resistance and good electromagnetic wave shielding property; does not contain heavy metal and organic harmful substances, and meets the requirement of environmental protection.
By comparison with the above examples, it was found that the film resistance was improved by 64%, 73% and 210% respectively with polyacrylic acid having a molecular weight of 8000, without polyacrylic acid, without higher fatty acid. In addition, 100 parts of polyacrylic acid (molecular weight 1000) and 50 parts by weight of heneicosa were selected for etching. Compared with the etching by using common acid, the film resistance is reduced by 24%.
While there have been shown and described what are at present considered to be the basic principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (10)
1. The magnesium alloy surface treating agent is characterized by comprising a first component and a second component, wherein the first component comprises 100 parts by weight of nitric acid and 5-20 parts by weight of sodium fluosilicate, and the second component comprises 100 parts by weight of solvent, 10-20 parts by weight of polyacrylic acid and 10-20 parts by weight of higher fatty acid; the mass ratio of the first component to the second component is 3-10.
2. The magnesium alloy surface treatment agent according to claim 1, wherein the polyacrylic acid has a weight average molecular weight of 500 to 2000.
3. The magnesium alloy surface treatment agent according to claim 1, wherein the higher fatty acid is a fatty acid having a carbon number of 18 to 25.
4. The magnesium alloy surface treatment agent according to claim 1, wherein the mass ratio of the polyacrylic acid to the higher fatty acid is 1.
5. The magnesium alloy surface treatment agent according to claim 1, wherein the solvent is one or more selected from methanol, acetone, and triethanolamine.
6. The magnesium alloy surface treatment agent as claimed in claim 1, wherein the second component further comprises a corrosion inhibitor, a wetting agent and a stabilizer.
7. The magnesium alloy surface treating agent according to claim 6, wherein the corrosion inhibitor is one or more selected from triethanolamine oleate, diethanolamine oleate, sodium benzoate, and alkylpyridinium chloride salts.
8. The magnesium alloy surface treatment agent according to claim 6, wherein the wetting agent is one or more selected from the group consisting of OP emulsifier, tween emulsifier and fatty alcohol-polyoxyethylene ether.
9. The magnesium alloy surface treatment agent according to claim 6, wherein the stabilizer is one or more selected from glycolic acid, ethylenediaminetetraacetic acid and salts thereof.
10. A processing method of magnesium alloy is characterized by comprising the following steps:
after degreasing, washing, etching, washing and activating treatment are carried out on the magnesium alloy, the treated magnesium alloy is placed into a bath solution, the bath solution contains a magnesium alloy surface treating agent, the pH value of the bath solution is 1-2, the surface treating agent comprises a first component and a second component, the first component comprises 100 parts by weight of nitric acid and 5-20 parts by weight of sodium fluosilicate, and the second component comprises 100 parts by weight of solvent, 10-20 parts by weight of polyacrylic acid and 10-20 parts by weight of higher fatty acid; the mass ratio of the first component to the second component is 3-10, the treatment temperature is 30-60 ℃, and the treatment time is 180-420 seconds.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211224912.8A CN115679306A (en) | 2022-10-09 | 2022-10-09 | Magnesium alloy surface treating agent and magnesium alloy treatment method |
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| CN202211224912.8A CN115679306A (en) | 2022-10-09 | 2022-10-09 | Magnesium alloy surface treating agent and magnesium alloy treatment method |
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| CN115679306A true CN115679306A (en) | 2023-02-03 |
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| CN202211224912.8A Pending CN115679306A (en) | 2022-10-09 | 2022-10-09 | Magnesium alloy surface treating agent and magnesium alloy treatment method |
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