CN102337498A - Aluminum alloy surface anti-corrosion treatment method and product treated by the aluminum alloy surface anti-corrosion treatment method - Google Patents
Aluminum alloy surface anti-corrosion treatment method and product treated by the aluminum alloy surface anti-corrosion treatment method Download PDFInfo
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- CN102337498A CN102337498A CN2010102368310A CN201010236831A CN102337498A CN 102337498 A CN102337498 A CN 102337498A CN 2010102368310 A CN2010102368310 A CN 2010102368310A CN 201010236831 A CN201010236831 A CN 201010236831A CN 102337498 A CN102337498 A CN 102337498A
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Abstract
The invention provides an aluminum alloy surface anti-corrosion treatment method and a product treated by the aluminum alloy surface anti-corrosion treatment method. The aluminum alloy surface anti-corrosion treatment method comprises the following steps of carrying out ultrasonic cleaning of an aluminum alloy base material by absolute ethanol, and carrying out a sputtering coating process on the surface of the cleaned aluminum alloy base material by a magnetron sputtering technology to form a chromium-oxygen-nitrogen compound film, wherein pour chromium is utilized as a targeting material; argon gas is utilized as work gas; and oxygen gas and nitrogen gas are utilized as reaction gas; an oxygen flow is in a range of 10 to 150sccm; and a nitrogen flow is in a range of 10 to 100sccm. An aluminum alloy product treated by the aluminum alloy surface anti-corrosion treatment method comprises an aluminum alloy base material and a chromium-oxygen-nitrogen compound film formed on the surface of the aluminum alloy base material, wherein the chromium-oxygen-nitrogen compound film comprises: by the number of atoms, 46 to 70% of chromium atoms, 20 to 50% of oxygen atoms, and 5 to 10% of nitrogen atoms.
Description
Technical field
The present invention relates to a kind of aluminum alloy surface method for anticorrosion treatment and goods thereof.
Background technology
Duraluminum has advantages such as light weight, perfect heat-dissipating, is widely used in fields such as communication, electronics, communications and transportation, building and space flight and aviation.Aluminum alloy surface can form alumina protective layer in air; Under general atmospheric environment, the pellumina of aluminum alloy surface can be protected alloy matrix aluminum effectively, but in containing electrolytical moisture; Ocean surface atmospheric environment for example; Spot corrosion appears in aluminum alloy surface easily, and the outward appearance of serious broken ring Al-alloy products causes goods shortening in work-ing life simultaneously.
In order to improve the salt spray resistance of duraluminum, need carry out surface filming to aluminum alloy surface usually and handle, common processing means have anodize, baking vanish etc., but all there is bigger problem of environmental pollution in these technologies.And vacuum plating (PVD) is though technology is a kind of coating process of very environmental protection; And the rete kind that can be coated with is abundant, wear resisting property is excellent; But the film of PVD process deposits is grown with the column crystal form often; Therefore there is a large amount of intergranular gaps in rete, causes film compactness can't prevent the erosion of salt fog inadequately effectively.
Summary of the invention
In view of this, be necessary to provide a kind of effective aluminum alloy surface method for anticorrosion treatment.
In addition, also be necessary to provide a kind of Al-alloy products that makes by aforesaid method.
A kind of aluminum alloy surface method for anticorrosion treatment may further comprise the steps:
(1) adopt absolute ethyl alcohol that aluminum alloy base material is carried out ultrasonic cleaning;
(2) being target with pure chromium, is working gas with the argon gas, and nitrogen and oxygen are reactant gases, adopts magnetron sputtering method at the surperficial sputter one chromium oxynitride compound film of aluminum alloy base material, and said oxygen flow is 10～150sccm, and nitrogen flow is 10～100sccm.
A kind of through aforesaid method aluminium alloy treated goods; Comprise aluminum alloy base material and be formed at the surperficial chromium oxynitride compound film of aluminum alloy base material; Chromium atom number per-cent is 46%～70% in this chromium oxynitride compound film; Sauerstoffatom number per-cent is 20%～50%, and nitrogen-atoms number per-cent is 5%～10%.
Compared to prior art; Has a chromium oxynitride compound film by the prepared Al-alloy products of above-mentioned aluminum alloy surface method for anticorrosion treatment owing to its surface; This chromium oxynitride compound film is made up of more tiny crystal grain, and the intergranular gap is smaller, makes that the chromium oxynitride compound film is dense; Can prevent effectively that salt fog from corroding, and therefore can effectively improve corrosion resistance of aluminium alloys.
Description of drawings
Fig. 1 one adopts the sem photograph of 50,000 times of amplifications of the chromium nitride film of magnetic control sputtering plating method preparation.
Fig. 2 is the sem photograph of 50,000 times of the amplifications of the chromium oxynitride compound film of one embodiment of the invention preparation.
Fig. 3 amplifies 300,000 times sem photograph for chromium oxynitride compound film shown in Figure 2.
Embodiment
Aluminum alloy surface method for anticorrosion treatment of the present invention mainly comprises the steps:
(1) adopt absolute ethyl alcohol that aluminum alloy base material is carried out ultrasonic cleaning, to remove the specimen surface greasy dirt.
(2) being target with pure chromium, is working gas with the argon gas, and nitrogen and oxygen are reactant gases, adopts magnetron sputtering method to be coated with chromium oxynitride compound (Cr-O-N) film on the aluminum alloy base material surface after cleaning.Sputtering parameter is following: vacuum tightness is 5 * 10 in the vacuum chamber
-3Pa～9 * 10
-3Pa, cavity temperature are 100～180 ℃, and the pivoted frame rotating speed is 0.5～1 rev/min; Argon flow amount is 150～300sccm (a standard state ml/min), and oxygen flow is 10～150sccm, and nitrogen flow is 10～100sccm; The chromium target power output is 6～12kw; Bias voltage is-100～-300V, dutycycle is 40%～60%, sputter 0.5～2 hour.Obtain the said chromium oxynitride compound film of about 0.4～2 μ m of thickness thus on the aluminum alloy base material surface.
The Al-alloy products that is obtained by above-mentioned aluminum alloy surface method for anticorrosion treatment; Comprise aluminum alloy base material and be formed at the surperficial chromium oxynitride compound film of aluminum alloy base material; Chromium atom number per-cent is 46%～70% in this chromium oxynitride compound film; Sauerstoffatom number per-cent is 20%～50%, and nitrogen-atoms number per-cent is 5%～10%.This chromium oxynitride compound film is made up of the crystal grain that diameter is approximately 5～8nm.
Come the present invention is specified through embodiment below.
Embodiment 1
Adopt absolute ethyl alcohol that aluminum alloy specimen was carried out ultrasonic cleaning about 30 minutes.Cleaned aluminum alloy specimen is put into the vacuum chamber of medium frequency magnetron sputtering coating equipment.The employed medium frequency magnetron sputtering coating equipment of present embodiment is that south, Shenzhen innovation vacuum technique ltd produces, and model is SM-1100H.
The open vacuum pump vacuumizes and set vacuum tightness to vacuum chamber be 8 * 10
-3Pa, opening pivoted frame and setting rotating speed is 0.5 rev/min, baking of open vacuum chamber and setting cavity temperature are 120 ℃.
After the vacuum tightness of treating vacuum chamber is evacuated to above-mentioned set(ting)value, feed working gas argon gas and reactant gases oxygen and nitrogen, argon flow amount is 150sccm (a standard state ml/min), and oxygen flow is 40sccm, and nitrogen flow is 30sccm; Opening the chromium target and regulating the chromium target power output is 8kw, bias voltage-200V, and dutycycle is 50%, sputter 1 hour obtains a chromium oxynitride compound film in aluminum alloy surface thus.
Embodiment 2
Embodiment 2 and embodiment 1 are similar, and different is, the oxygen flow of present embodiment is 100sccm, and nitrogen flow is 60sccm, and other condition is all identical with embodiment 1.Also can make the Al-alloy products that the surface is formed with a chromium oxynitride compound film according to embodiment 2.
Chromium oxynitride compound film pattern, the texture ratio of the Al-alloy products that is made by embodiment 1 and embodiment 2 are similar, and have similar antiseptic property.
Comparative Examples
Adopt and aluminum alloy specimen is carried out sputter with embodiment 1 identical medium frequency magnetron sputtering coating equipment; Different with embodiment 1 is that reactant gases is a nitrogen; Nitrogen flow is 30～100sccm, and other condition is identical with embodiment 1, sputter one single component chromium nitride (CrN) film on the aluminum alloy specimen surface.
Chromium nitride (CrN) film that chromium oxynitride compound film that embodiment 1 is coated with and Comparative Examples are coated with is used its surface topography of scanning electron microscopic observation respectively, and the model that used ESEM appearance is NSK production is the field emission scanning electron microscope appearance of JSM-6701F.The sem photograph of the chromium nitride that Fig. 1 is coated with for Comparative Examples (CrN) film, the sem photograph of the chromium oxynitride compound film that Fig. 2 and Fig. 3 are coated with for the embodiment of the invention 1.Can find out from Fig. 1, Fig. 2 and Fig. 3; Single component chromium nitride (CrN) film is made up of thicker column crystal; And there are a large amount of bigger intergranular gaps in the surface, and the chromium oxynitride compound film is formed (ginseng Fig. 3) by more tiny crystal grain, and average grain diameter is approximately 5～8nm; The intergranular gap is smaller, makes that the chromium oxynitride compound film is dense.
Aluminum alloy specimen to aluminum alloy specimen that the chromium oxynitride compound film is arranged by the prepared plating of method of the present invention and the prepared plating chromium nitride of Comparative Examples (CrN) film carries out 35 ℃ of neutral salt spray (NaCl concentration is 5%) test.The result finds that obviously corrosion just took place after 4 hours the aluminum alloy specimen of coating surface chromium nitride (CrN) film; And the aluminum alloy specimen of coating surface chromium oxynitride compound film just has corrosion phenomenon after 72.
It is thus clear that because its surface has a chromium oxynitride compound film, this chromium oxynitride compound film can prevent effectively that salt fog from corroding, and therefore can improve corrosion resistance of aluminium alloys by the prepared Al-alloy products of aluminum alloy surface method for anticorrosion treatment of the present invention.
Claims (9)
1. aluminum alloy surface method for anticorrosion treatment may further comprise the steps:
(1) adopt absolute ethyl alcohol that aluminum alloy base material is carried out ultrasonic cleaning;
(2) being target with pure chromium, is working gas with the argon gas, and nitrogen and oxygen are reactant gases, adopts magnetron sputtering method at the surperficial sputter one chromium oxynitride compound film of aluminum alloy base material, and said oxygen flow is 10～150sccm, and nitrogen flow is 10～100sccm.
2. aluminum alloy surface method for anticorrosion treatment as claimed in claim 1 is characterized in that: this step (2) also is included under the following parameter condition carries out: vacuum tightness is 5 * 10 in the vacuum chamber
-3Pa～9 * 10
-3Pa, cavity temperature are 100～180 ℃, and the pivoted frame rotating speed is 0.5～1 rev/min, and the chromium target power output is 6～12kw, and argon flow amount is 150～300sccm, the chromium target bias is-100～-300V, dutycycle is 40%～60%, sputter 0.5～2 hour.
3. aluminum alloy surface method for anticorrosion treatment as claimed in claim 2 is characterized in that: said step (2) is in a medium frequency magnetron sputtering equipment, to carry out.
4. aluminum alloy surface method for anticorrosion treatment as claimed in claim 2 is characterized in that: the thickness of this chromium oxynitride compound film is 0.4～2 μ m.
5. aluminum alloy surface method for anticorrosion treatment as claimed in claim 1; It is characterized in that: chromium atom number per-cent is 46%～70% in this chromium oxynitride compound film; Sauerstoffatom number per-cent is 20%～50%, and nitrogen-atoms number per-cent is 5%～10%.
6. aluminum alloy surface method for anticorrosion treatment as claimed in claim 1 is characterized in that: this chromium oxynitride compound film is that the crystal grain of 5～8nm is formed by diameter.
7. Al-alloy products; Comprise aluminum alloy base material; It is characterized in that: this Al-alloy products also comprises a chromium oxynitride compound film that is formed at the aluminum alloy base material surface; Chromium atom number per-cent is 46%～70% in this chromium oxynitride compound film, and Sauerstoffatom number per-cent is 20%～50%, and nitrogen-atoms number per-cent is 5%～10%.
8. Al-alloy products as claimed in claim 7 is characterized in that: this chromium oxynitride compound film is that the crystal grain of 5～8nm is formed by diameter.
9. Al-alloy products as claimed in claim 7, the thickness that it is characterized in that this chromium oxynitride compound film are 0.4～2 μ m.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103256142A (en) * | 2013-05-03 | 2013-08-21 | 武汉大学 | Fuel-saving type Cr-O-N nanocrystalline composite ceramic coated piston ring of diesel engine and preparation method thereof |
Citations (1)
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| CN101119860A (en) * | 2005-02-17 | 2008-02-06 | 桑德维克知识产权股份公司 | Coated metal product, method to produce it and use of the method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101119860A (en) * | 2005-02-17 | 2008-02-06 | 桑德维克知识产权股份公司 | Coated metal product, method to produce it and use of the method |
Non-Patent Citations (2)
| Title |
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| ST. COLLARD ET.AL.: "The reactive magnetron deposition of CrNxOy films: first results of property investigations", 《SURFACE AND COATINGS TECHNOLOGY》 * |
| 牛建钢: "中频反应磁控溅射制备氮化锆薄膜及颜色制备工艺参数研究", 《中国优秀硕士学位论文全文数据库（电子期刊）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103256142A (en) * | 2013-05-03 | 2013-08-21 | 武汉大学 | Fuel-saving type Cr-O-N nanocrystalline composite ceramic coated piston ring of diesel engine and preparation method thereof |
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Application publication date: 20120201 |