CN100497741C - Method for protecting magnesium alloy - Google Patents
Method for protecting magnesium alloy Download PDFInfo
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- CN100497741C CN100497741C CNB200510047631XA CN200510047631A CN100497741C CN 100497741 C CN100497741 C CN 100497741C CN B200510047631X A CNB200510047631X A CN B200510047631XA CN 200510047631 A CN200510047631 A CN 200510047631A CN 100497741 C CN100497741 C CN 100497741C
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title abstract description 44
- 230000002633 protecting effect Effects 0.000 title description 2
- 239000011159 matrix material Substances 0.000 claims abstract description 118
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000000151 deposition Methods 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims description 201
- 239000011248 coating agent Substances 0.000 claims description 199
- 230000008021 deposition Effects 0.000 claims description 10
- QFUKUPZJJSMEGE-UHFFFAOYSA-N 5-(hydroxymethyl)-1-(3-methylbutyl)pyrrole-2-carbaldehyde Chemical compound CC(C)CCN1C(CO)=CC=C1C=O QFUKUPZJJSMEGE-UHFFFAOYSA-N 0.000 claims description 6
- 238000009501 film coating Methods 0.000 claims description 4
- 239000010409 thin film Substances 0.000 claims description 3
- 239000007888 film coating Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 abstract description 244
- 229910045601 alloy Inorganic materials 0.000 abstract description 138
- 239000000956 alloy Substances 0.000 abstract description 138
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 abstract description 110
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005498 polishing Methods 0.000 abstract description 2
- 239000011247 coating layer Substances 0.000 abstract 8
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 abstract 2
- 238000007605 air drying Methods 0.000 abstract 1
- 238000005234 chemical deposition Methods 0.000 abstract 1
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 238000003801 milling Methods 0.000 abstract 1
- 239000003208 petroleum Substances 0.000 abstract 1
- 238000005488 sandblasting Methods 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 description 204
- 230000007797 corrosion Effects 0.000 description 158
- 238000002360 preparation method Methods 0.000 description 135
- 239000011777 magnesium Substances 0.000 description 94
- 238000004506 ultrasonic cleaning Methods 0.000 description 54
- 238000005238 degreasing Methods 0.000 description 53
- 239000004576 sand Substances 0.000 description 53
- 238000005229 chemical vapour deposition Methods 0.000 description 31
- 230000002708 enhancing effect Effects 0.000 description 29
- 238000004544 sputter deposition Methods 0.000 description 14
- 239000007921 spray Substances 0.000 description 13
- 230000010287 polarization Effects 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 6
- 238000005240 physical vapour deposition Methods 0.000 description 5
- 239000011253 protective coating Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000001755 magnetron sputter deposition Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- DOBRDRYODQBAMW-UHFFFAOYSA-N copper(i) cyanide Chemical compound [Cu+].N#[C-] DOBRDRYODQBAMW-UHFFFAOYSA-N 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005649 metathesis reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- NNFCIKHAZHQZJG-UHFFFAOYSA-N potassium cyanide Chemical compound [K+].N#[C-] NNFCIKHAZHQZJG-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- MNWBNISUBARLIT-UHFFFAOYSA-N sodium cyanide Chemical compound [Na+].N#[C-] MNWBNISUBARLIT-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000004347 surface barrier Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Sampling And Sample Adjustment (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
This invention discloses a method for preparing a new-anti-corrosive coating layer on Mg alloy. The coating layer is multi-layered Al or Al/TiN coating layer. The method comprises: pre-milling matrix alloy, polishing or sandblasting, ultrasonicating in acetone, ethanol or petroleum ether, air-drying, directly depositing multi-layered Al layer onto the surface of the matrix, and/or depositing TiN layer onto the surface of the multi-layered Al coating layer. The multi-layered Al coating layer has a total thickness of 10-200 mum, a layer number of 1-50, and each layer thickness of 1-100 mum. The TiN coating layer has a total thickness of 1-50 mums. The method solves the problems of low anti-corrosive performance of chemically deposited coating layer and serious environmental pollution caused by chemical deposition. The new anti-corrosive coating layer, when applied on AZ91D Mg alloy, has high anti-corrosive and anti-abrasive performances.
Description
Technical field:
The present invention relates to Materials science, a kind of magnesium alloy means of defence in Mg alloy surface deposit multilayer Al or multilayer Al/TiN coating is provided especially.
Background technology:
Magnesium alloy is the lightest commercial structural metallic materials, has obtained in fields such as automobile, aviation, communication, electronics, machineries in recent years using widely.Yet because the chemically reactive of magnesium alloy is higher; in air, be easy to oxidation; generate oxide film loose, the protective capability difference; cause magnesium alloy in atmosphere, soil and the seawater of humidity, all serious corrosion will take place; hindered the widespread use of magnesium alloy, its application prospect depends on safeguard procedures to a great extent.
Improve the corrosion resistance nature of Mg alloy surface, except that Chemical Composition that improves material itself and metallurgical method, existing treatment process is that alloy surface is carried out chemical conversion film, electrochemical oxidation etc. at present, to reach the purpose that strengthens alloy corrosion resistance.People expect a kind of technology to the magnesium alloy better protecting effect.
Technology contents:
The purpose of this invention is to provide a kind of magnesium alloy guard technology.Particularly be in Mg alloy surface deposit multilayer Al and multilayer Al/TiN coating, by to coat-thickness, the adjustment of the number of plies and processing parameter, it is poor to have solved the coating of magnesium alloy surface barrier propterty, and the problem that cost is high makes operation safeization and environmental protectionization simultaneously.
A kind of magnesium alloy means of defence of the present invention, described means of defence is a coating hard film coating on magnesium alloy matrix surface, it is characterized in that: described ganoine thin film coating is one to the multilayer Al coating.
A kind of magnesium alloy means of defence of the present invention is characterized in that: described means of defence is to apply earlier one to the multilayer Al coating on magnesium alloy matrix surface, then at outermost Al coatingsurface depositing TiN layer again.
Magnesium alloy means of defence of the present invention, deposition one total thickness to the multilayer Al coating is 10～100 μ m, and the coating number of plies is between the 1-50, and each layer thickness is 1-100 μ m; If the most surperficial one deck of ganoine thin film is the TiN layer, then this layer thickness is 1-50 μ m.
Magnesium alloy means of defence of the present invention is characterized in that: the method for preparing the employing of Al and TiN coating is one of following four kinds of methods: thermospray; Sputter; The electric arc plating; EB-PVD (electro beam physics vapour deposition), CVD (chemical vapour deposition).
Magnesium alloy means of defence of the present invention, it is characterized in that: before coating applies operation, preferably at first carry out following pre-treatment process: at first with matrix alloy through pre-grinding, the processing of polishing or sandblast, ultrasonic cleaning in acetone or alcohol or sherwood oil dries up afterwards then.
The invention provides a kind of magnesium alloy means of defence, comprise pre-treatment and coating preparation process, one directly is deposited on magnesium alloy matrix surface to the multilayer Al coating, also can be at outermost Al coatingsurface depositing TiN layer again.
Referring to accompanying drawing 9: the bottom is a matrix, is followed successively by each surface sediments on it, and uppermost one deck is an outermost layer.
A kind of used for magnesium alloy novel corrosion resistant of the present invention coating and preparation method thereof, key is the thickness in monolayer and the number of plies of multilayer Al coating, the preparation process of Al and surperficial TiN coating can adopt conventional commercial run, preferably select for use the PVD method to prepare the Al layer, surperficial TiN layer can adopt the method preparation of PVD (physical vapor deposition) and CVD (chemical vapour deposition).
Improve the corrosion resistance nature of Mg alloy surface, remove the Chemical Composition and the metallurgical method that improve material itself, with alloy surface is carried out chemical conversion film, electrochemistry oxygen is outside the pale of civilization, concentrate on studies through the contriver, it is the feasible best approach that discovery is carried out washing to alloy surface, and its effect that strengthens alloy corrosion resistance is obviously more excellent.Can effectively protect matrix alloy in Mg alloy surface metal refining coating; different metal has tangible difference to its provide protection; because magnesium alloy has extremely strong chemically reactive; be subjected to the corrosion of solution easily; can strong replacement(metathesis)reaction take place with the solution metal ion; as adopt the method actual process of plating or electroless plating complicated, and contain prussiates such as CuCN, KCN, NaCN in the plating bath, easy contaminate environment.Studies show that Al can provide favorable protection to magnesium alloy, and the Al coating of the different thickness and the number of plies is also different to the protective effect of matrix alloy.We can be as required in magnesium alloy matrix surface preparation one to the multilayer Al coating, in the further TiN coating of preferred preparation high rigidity of outermost Al coatingsurface.If can outside the multilayer Al coating, add the protection aspect of TiN coatings applications again to multilayer Al or with above-mentioned one,, can also widen its use range greatly improving the corrosion resistance nature of magnesium alloy in magnesium alloy.
Advantage of the present invention: utilize easy technology, lower-cost Al coating and multilayer Al/TiN coating has solved the corrosion protection problem of magnesium alloy, technology is simple, the coatings prepared tack is good, erosion resistance is good, can handle complex contour, the different workpiece of structure, thereby satisfy various service requirementss.Can apply in vacuum system, technological process is clean, and is little to the pollution of coating, and the quality of coating is higher, and is easy to extensive and automatic production.Especially temperature is lower in the deposition process, vacuum tightness is high, can effectively avoid diffusion and oxidation between the element.
Description of drawings
The present invention is further detailed explanation below in conjunction with drawings and the specific embodiments.
Fig. 1 is one of polarization curve of magnesium alloy and Al coating;
One of polarization curve of Fig. 2 magnesium alloy and Al/TiN coating;
Two of the polarization curve of Fig. 3 magnesium alloy and Al coating;
Two of the polarization curve of Fig. 4 magnesium alloy and Al/TiN coating;
Three of the polarization curve of Fig. 5 magnesium alloy and Al coating;
Three of the polarization curve of Fig. 6 magnesium alloy and Al/TiN coating;
Four of the polarization curve of Fig. 7 magnesium alloy and Al coating;
Four of the polarization curve of Fig. 8 magnesium alloy and Al/TiN coating;
Fig. 9 is magnesium alloy protection principle schematic of the present invention.
Embodiment:
The embodiment of the invention is specifically undertaken by following step:
Embodiment 1: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 40 μ m at the single Al layer thickness of matrix alloy surface preparation.
After learning sputter Al coating from Fig. 1, the corrosion potential of AZ91D magnesium alloy raises, and corrosion current reduces, and anti-corrosion capability significantly strengthens.
Embodiment 2: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 40 μ m at the single Al layer thickness of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Learn from Fig. 2, compare with the magnesium alloy that has only one deck Al coating that increase the TiN coating on the sputter Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 3: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 20 μ m at 2 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Learn from Fig. 3, compare with the magnesium alloy that has only one deck Al coating that two-layer Al coating makes the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.
Embodiment 4: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 20 μ m at 2 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Learn from Fig. 4, compare with the magnesium alloy that has only two-layer Al coating that increase the TiN coating on the two-layer Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 5: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 13 μ m at 3 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Learn from Fig. 5, compare with the magnesium alloy that has only two-layer Al coating that three layers of Al coating make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.
Embodiment 6: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 13 μ m at 3 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Learn from Fig. 6, compare with the magnesium alloy that has only three layers of Al coating that increase the TiN coating on three layers of Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 7: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 10 μ m at 4 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Learn from Fig. 7, compare with the magnesium alloy that has only three layers of Al coating that four layers of Al coating make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.
Embodiment 8: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 10 μ m at 4 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Learn from Fig. 8, compare with the magnesium alloy that has only four layers of Al coating that increase the TiN coating on four layers of Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 9: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 10 μ m at 10 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Embodiment 10: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 10 μ m at 10 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 1 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+10 layer Al (sputter) | -1.287 | 3.72E-5 |
| Mg+10 layer Al (sputter)+TiN | -1.142 | 3.54E-5 |
Learn from table 1, compare with the magnesium alloy that has only 10 layers of sputter Al coating that increase the TiN coating on 10 layers of sputter Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 11: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 2 μ m at 50 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Embodiment 12: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 2 μ m at 50 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 2 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+50 layer Al (sputter) | -1.154 | 3.64E-5 |
| Mg+50 layer Al (sputter)+TiN | -1.121 | 3.32E-5 |
Learn from table 2, compare with the magnesium alloy that has only 50 layers of sputter Al coating that increase the TiN coating on 50 layers of sputter Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 13: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 1 μ m at 100 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Embodiment 14: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting sputtering method is about 1 μ m at 100 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 3 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+100 layer Al (sputter) | -1.112 | 3.12E-5 |
| Mg+100 layer Al (sputter)+TiN | -1.091 | 3.01E-5 |
Learn from table 3, compare with the magnesium alloy that has only 100 layers of sputter Al coating that increase the TiN coating on 100 layers of sputter Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 15: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting the multi sphere method is about 40 μ m at the single Al layer thickness of matrix alloy surface preparation.
Embodiment 16: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting the multi sphere method is about 40 μ m at the single Al layer thickness of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 4 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (multi sphere) | -1.632 | 3.45E-4 |
| Mg+Al (multi sphere)+TiN | -1.463 | 1.12E-4 |
Learn that from table 4 corrosion potential of AZ91D magnesium alloy raises through after multi sphere prepares one deck Al coating, corrosion current reduces, and anti-corrosion capability significantly strengthens.Compare with the magnesium alloy that has only one deck multi sphere Al coating, increase the TiN coating on the multi sphere Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.
Embodiment 17: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting the multi sphere method is about 20 μ m at 2 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Embodiment 18: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting the multi sphere method is that thickness is about 20 μ m at 2 layers of every bed thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 5 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (multi sphere) | -1.632 | 3.45E-4 |
| Mg+Al+Al (multi sphere) | -1.559 | 1.87E-4 |
| Mg+Al+Al (multi sphere)+TiN | -1.484 | 8.71E-5 |
Learn from table 5, compare with the magnesium alloy that has only one deck multi sphere Al coating that two-layer multi sphere Al coating makes the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.Compare with the magnesium alloy that has only two-layer multi sphere Al coating, increase the TiN coating on the two-layer multi sphere Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.
Embodiment 19: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting the multi sphere method is about 13 μ m at 3 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Embodiment 20: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting the multi sphere method is about 13 μ m at 3 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 6 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (multi sphere) | -1.632 | 3.45E-4 |
| Mg+Al+Al (multi sphere) | -1.559 | 1.87E-4 |
| Mg+Al+Al+Al (multi sphere) | -1.501 | 9.17E-5 |
| Mg+Al+Al+Al (multi sphere)+TiN | -1.435 | 5.69E-5 |
Learn from table 6, compare with the magnesium alloy that has only one deck multi sphere Al coating that two-layer multi sphere Al coating makes the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.Compare with the magnesium alloy that has only three layers of multi sphere Al coating, increase the TiN coating on three layers of multi sphere Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.
Embodiment 21: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting the multi sphere method is about 10 μ m at 4 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Corrosion potential/the electric current of table 7 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (multi sphere) | -1.632 | 3.45E-4 |
| Mg+Al+Al (multi sphere) | -1.559 | 1.87E-4 |
| Mg+Al+Al+Al (multi sphere) | -1.501 | 9.17E-5 |
| Mg+Al+Al+Al+Al (multi sphere) | -1.387 | 3.84E-5 |
Learn from table 7, compare with the magnesium alloy that has only three layers of multi sphere Al coating that four layers of multi sphere Al coating make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.
Embodiment 22: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting the multi sphere method is about 10 μ m at 4 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 8 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (multi sphere) | -1.632 | 3.45E-4 |
| Mg+Al+Al (multi sphere) | -1.559 | 1.87E-4 |
| Mg+Al+Al+Al (multi sphere) | -1.501 | 9.17E-5 |
| Mg+Al+Al+Al+Al (multi sphere) | -1.387 | 3.84E-5 |
| Mg+Al+Al+Al+Al (multi sphere)+TiN | -1.296 | 1.04E-5 |
Learn from table 8, compare with the magnesium alloy that has only 4 layers of multi sphere Al coating that increase the TiN coating on 4 layers of multi sphere Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 23: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting the multi sphere method is about 10 μ m at 10 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Embodiment 24: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting the multi sphere method is about 10 μ m at 10 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 9 alloy and coating
| Measure sample | Corrosion potential V) | Corrosion current A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+10 layer Al (multi sphere) | -1.315 | 3.81E-5 |
| Mg+10 layer Al (multi sphere)+TiN | -1.152 | 3.59E-5 |
Learn from table 9, compare with the magnesium alloy that has only Al coating more than 10 layers that increase the TiN coating on 10 layers of multi sphere Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 25: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting the multi sphere method is about 2 μ m at 50 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Embodiment 26: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting the multi sphere method is about 2 μ m at 50 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 10 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+50 layer Al (multi sphere) | -1.294 | 3.78E-5 |
| Mg+50 layer Al (multi sphere)+TiN | -1.149 | 3.54E-5 |
Learn from table 10, compare with the magnesium alloy that has only 50 layers of sputter Al coating that increase the TiN coating on 50 layers of multi sphere Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 27: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting multi sphere is about 1 μ m at 100 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Embodiment 28: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting multi sphere is about 1 μ m at 100 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 11 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+100 layer Al (multi sphere) | -1.119 | 3.14E-5 |
| Mg+100 layer Al (multi sphere)+TiN | -1.101 | 3.03E-5 |
Learn from table 11, compare with the magnesium alloy that has only 100 layers of multi sphere Al coating that increase the TiN coating on 100 layers of multi sphere Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 29: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.(electro beam physics vapour deposition is about 40 μ m at 1 layer of Al layer thickness of matrix alloy surface preparation to adopt EB-PVD.
Embodiment 30: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.(electro beam physics vapour deposition is about 20 μ m at 2 layers of every layer thickness of Al layer of matrix alloy surface preparation to adopt EB-PVD.
Embodiment 31: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.(electro beam physics vapour deposition is about 13 μ m at 3 layers of every layer thickness of Al layer of matrix alloy surface preparation to adopt EB-PVD.
Embodiment 32: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.(electro beam physics vapour deposition is about 10 μ m at 4 layers of every layer thickness of Al layer of matrix alloy surface preparation to adopt EB-PVD.
Embodiment 33: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopt EB-PVD (electro beam physics vapour deposition is about 10 μ m at 4 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Know that from table 12 being coated with the number of plies with Al increases, the corrosion potential of magnesium alloy raises, and corrosion current reduces, and anti-corrosion capability further significantly strengthens.Compare with the magnesium alloy that has only 4 layers of multi sphere Al coating, increase the TiN coating on 4 layers of multi sphere Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.
Corrosion potential/the electric current of table 12 alloy and coating
| Measure sample | Corrosion electricity (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al(EB-PVD) | -1.611 | 3.43E-4 |
| Mg+Al+Al(EB-PVD) | -1.547 | 1.86E-4 |
| Mg+Al+Al+Al(EB-PVD) | -1.498 | 9.15E-5 |
| Mg+Al+Al+Al+Al(EB-PVD) | -1.369 | 3.79E-5 |
| Mg+Al+Al+Al+Al(EB-PVD)+TiN | -1.289 | 1.02E-5 |
Embodiment 34: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting hot spray process is about 40 μ m at the single Al layer thickness of matrix alloy surface preparation.
Learn that from table 13 corrosion potential of AZ91D magnesium alloy raises through after thermospray prepares one deck Al coating, corrosion current reduces, and anti-corrosion capability significantly strengthens.
Corrosion potential/the electric current of table 13 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (thermospray) | -1.626 | 3.31E-4 |
Embodiment 35: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting hot spray process is about 40 μ m at the single Al layer thickness of matrix alloy surface preparation, and then with the CVD method at the thick left and right sides of its surface preparation 2 μ m TiN layer.
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (thermospray) | -1.626 | 3.31E-4 |
| Mg+Al (thermospray)+TiN (CVD) | -1.574 | 1.03E-4 |
Corrosion potential/the electric current of table 14 alloy and coating
Learn from table 14, compare with the magnesium alloy that has only one deck thermospray Al coating that increase the TiN coating on the thermospray Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 36: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting hot spray process is about 20 μ m at 2 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Corrosion potential/the electric current of table 15 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (thermospray) | -1.626 | 3.31E-4 |
| Mg+Al+Al (thermospray) | -1.581 | 1.96E-4 |
Learn from table 15, compare with the magnesium alloy that has only one deck thermospray Al coating that two-layer thermospray Al coating makes the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.
Embodiment 37: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting hot spray process is that thickness is about 20 μ m at 2 layers of every bed thickness of Al layer of matrix alloy surface preparation, and then with the CVD method at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 16 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (thermospray) | -1.626 | 3.31E-4 |
| Mg+Al+Al (thermospray) | -1.581 | 1.96E-4 |
| Mg+Al+Al (thermospray)+TiN (CVD) | -1.527 | 7.76E-5 |
Learn from table 16, compare with the magnesium alloy that has only two-layer multi sphere Al coating that increase the TiN coating on the two-layer multi sphere Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 38: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting hot spray process is about 13 μ m at 3 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Corrosion potential/the electric current of table 17 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (thermospray) | -1.626 | 3.31E-4 |
| Mg+Al+Al (thermospray) | -1.581 | 1.96E-4 |
| Mg+Al+Al+Al (thermospray) | -1.519 | 7.01E-5 |
Learn from table 17, compare with the magnesium alloy that has only two-layer thermospray Al coating that three layers of thermospray Al coating make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.
Embodiment 39: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting hot spray process is about 13 μ m at 3 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with CVD at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 18 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (thermospray) | -1.626 | 3.31E-4 |
| Mg+Al+Al (thermospray) | -1.581 | 1.96E-4 |
| Mg+Al+Al+Al (thermospray) | -1.519 | 7.01E-5 |
| Mg+Al+Al+Al (thermospray)+TiN (CVD) | -1.473 | 3.16E-5 |
Learn from table 18, compare with the magnesium alloy that has only three layers of multi sphere Al coating that increase the TiN coating on three layers of multi sphere Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 40: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting hot spray process is about 10 μ m at 4 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Corrosion potential/the electric current of table 19 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (thermospray) | -1.626 | 3.31E-4 |
| Mg+Al+Al (thermospray) | -1.581 | 1.96E-4 |
| Mg+Al+Al+Al (thermospray) | -1.519 | 7.01E-5 |
| Mg+Al+Al+Al+Al (thermospray) | -.1466 | 2.19E-5 |
Learn from table 19, compare with the magnesium alloy that has only three layers of thermospray Al coating that four layers of thermospray Al coating make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.
Embodiment 41: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting hot spray process is about 10 μ m at 4 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with the CVD method at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 20 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (thermospray) | -1.626 | 3.31E-4 |
| Mg+Al+Al (thermospray) | -1.581 | 1.96E-4 |
| Mg+Al+Al+Al (thermospray) | -1.519 | 7.01E-5 |
| Mg+Al+Al+Al+Al (thermospray) | -1.466 | 2.19E-5 |
| Mg+Al+Al+Al+Al (thermospray)+TiN (CVD) | -1.321 | 7.69E-6 |
Learn from table 20, compare with the magnesium alloy that has only four layers of multi sphere Al coating that increase the TiN coating on four layers of Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, anti-corrosion capability is significantly enhancing further.
Embodiment 42: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopt EB-PVD (electro beam physics vapour deposition is about 2 μ m at 50 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with the CVD method at the thick left and right sides of its surface preparation 10 μ m TiN layer.
Embodiment 43: selection is an as cast condition AZ91D alloy, and sample size 15mm * 10mm * 3mm uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting EB-PVD (electro beam physics vapour deposition) is about 1 μ m at 100 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with the CVD method at the thick left and right sides of its surface preparation 10 μ m TiN layer.
Corrosion potential/the electric current of table 21 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+50 layer Al (EB-PVD)+TiN (CVD) | -1.107 | 3.12E-5 |
| Mg+100 layer Al (EB-PVD)+TiN (CVD) | -1.098 | 3.01E-5 |
Learn from table 21, compare with the magnesium alloy that has only 50 layers of Al coating that 100 layers of Al coating make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability is significantly enhancing further.
Embodiment 44: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting CVD (chemical vapour deposition) is about 10 μ m at 1 layer of Al layer thickness of matrix alloy surface preparation.
Embodiment 45: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting CVD (chemical vapour deposition) is about 5 μ m at 2 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Embodiment 45: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting CVD (chemical vapour deposition) is about 3 μ m at 3 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Embodiment 46: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting CVD (chemical vapour deposition) is about 2.5 μ m at 4 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Embodiment 47: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting CVD (chemical vapour deposition) is about 2.5 μ m at 4 layers of every layer thickness of Al layer of matrix alloy surface preparation, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Corrosion potential/the electric current of table 22 alloy and coating
| Measure sample | Corrosion electricity (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al(CVD) | -1.699 | 3.49E-4 |
| Mg+Al+Al(CVD) | -1.598 | 1.99E-4 |
| Mg+Al+Al+Al(CVD) | -1.535 | 9.19E-5 |
| Mg+Al+Al+Al+Al(CVD) | -1.479 | 3.81E-5 |
| Mg+Al+Al+Al+Al(CVD)+TiN | -1.309 | 1.01E-5 |
Learn that from table 22 being coated with the number of plies with Al increases, the corrosion potential of magnesium alloy raises, and corrosion current reduces, and anti-corrosion capability further significantly strengthens.Compare with the magnesium alloy that has only 4 layers of multi sphere Al coating, increase the TiN coating on 4 layers of multi sphere Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability significantly strengthens.
Embodiment 48: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting hot spray process is about 200 μ m at 1 layer of Al layer thickness of matrix alloy surface preparation.
Embodiment 49: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting hot spray process is about 100 μ m at 2 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Embodiment 50: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopting hot spray process is about 67 μ m at 3 layers of every layer thickness of Al layer of matrix alloy surface preparation.
Embodiment 51: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopt hot spray process at 4 layers of Al layer of matrix alloy surface preparation, every layer thickness is about 25 μ m.
Embodiment 52: selection is an as cast condition AZ91D alloy, and sample size is 15mm * 10mm * 3mm, uses the 1000grit sand papering, has identical surfaceness to guarantee matrix, carries out alkaline degreasing → acetone ultrasonic cleaning → coating preparation then.Adopt hot spray process at 4 layers of Al layer of matrix alloy surface preparation, every layer thickness is about 25 μ m, and then with multi sphere at the thick left and right sides of its surface preparation 2 μ m TiN layer.
Learn that from table 23 being coated with the number of plies with Al increases, the corrosion potential of magnesium alloy raises, and corrosion current reduces, and anti-corrosion capability further significantly strengthens.Compare with the magnesium alloy that has only 4 layers of multi sphere Al coating, increase the TiN coating on 4 layers of multi sphere Al coating basis again and make the corrosion potential of AZ91D magnesium alloy raise, corrosion current reduces, and anti-corrosion capability significantly strengthens.
Corrosion potential/the electric current of table 23 alloy and coating
| Measure sample | Corrosion potential (V) | Corrosion current (A/cm 2) |
| Mg | -1.753 | 6.50E-4 |
| Mg+Al (thermospray) | -1.617 | 3.28E-4 |
| Mg+Al+Al (thermospray) | -1.549 | 1.91E-4 |
| Mg+Al+Al+Al (thermospray) | -1.467 | 6.97E-5 |
| Mg+Al+Al+Al+Al (thermospray) | -1.451 | 2.01E-5 |
| Mg+Al+Al+Al+Al (thermospray)+TiN | -1.287 | 7.61E-6 |
Comparative Examples
Comparative Examples 1: aluminising protective coating (L.Zhu, G.L.Song, Surf.Coat ﹠amp; Tech, 2005, online), apply at Mg alloy surface by pure Al powder, through 420 ℃ of annealed methods, formed aluminium alloy covered again at Mg alloy surface.Measure electrokinetic potential polarization curve mode it is carried out the anti-corrosion capability evaluation.Its corrosion potential is-1.47V, and its corrosion current is 10 μ A, and anti-corrosion capability improves 3 orders of magnitude than magnesium alloy.Its anti-corrosion effect is not as the present invention.
Comparative Examples 2:
AlN multilayer physical vapor deposition protective coating (H.Altun, S.Sen, Mater.﹠amp; Design, 2005 on line),, on magnesium alloy, form 3 layers AlN protective coating respectively by the method for magnetron sputtering.Measure electrokinetic potential polarization curve mode it is carried out the anti-corrosion capability evaluation.Its corrosion potential is-1.42V, and its corrosion current is 100 μ A, and anti-corrosion capability improves 3 orders of magnitude than magnesium alloy.Its anti-corrosion effect is not as the present invention.
Comparative Examples 3: nanometer Ti physical vapor deposition protective coating (E.Zhang, L.Xu, K.Yang, Script.Mater.53 (2005) 523), by the method for magnetron sputtering, on magnesium alloy, form the Ti protective coating respectively.Measure electrokinetic potential polarization curve mode it is carried out the anti-corrosion capability evaluation.Going out its corrosion potential is-1.352V, and its corrosion current is 21.5 μ A, and anti-corrosion capability improves 1 order of magnitude than magnesium alloy.Its anti-corrosion effect is not as the present invention.
Claims (2)
1, a kind of magnesium alloy means of defence, described means of defence is a coating hard film coating on magnesium alloy matrix surface, it is characterized in that: described ganoine thin film coating is 2 to the multilayer Al coating, described means of defence be on magnesium alloy matrix surface 2 to the superficies of multilayer Al coating depositing TiN layer again.
2, according to the described magnesium alloy means of defence of claim 1, it is characterized in that: deposition 2 total thickness to the multilayer Al coating are 10～200 μ m, and the coating number of plies is between the 2-50, and each layer thickness is 1-100 μ m.
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| CN101696488B (en) * | 2009-10-19 | 2011-09-28 | 重庆理工大学 | Aluminum/titanium compound coating on surface of magnesium alloy by magnetron sputtering and technical method thereof |
| CN102505104B (en) * | 2011-12-27 | 2013-08-28 | 中国兵器工业第五二研究所 | Magnesium alloy surface pretreatment method |
| CN108251873A (en) * | 2018-01-22 | 2018-07-06 | 南昌大学 | A kind of surface modifying method of titanium alloy surface electroplated layer electron beam remelting again |
| CN108396319A (en) * | 2018-03-26 | 2018-08-14 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The preparation method of Magnesium Alloys Components corrosion resistance of surface |
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| CN1360087A (en) * | 2000-11-22 | 2002-07-24 | 松下电器产业株式会社 | Magnesium alloy formed products and mfg. method thereof |
| CN1563473A (en) * | 2004-04-15 | 2005-01-12 | 兰州理工大学 | Method in use for treating surface of workpiece in magnesium alloy |
| CN1648286A (en) * | 2004-05-17 | 2005-08-03 | 成都凯贝克纳米镀膜技术有限公司 | TiN-TiAIN series hard nano structure multilayer coating layer |
| CN1598035A (en) * | 2004-07-30 | 2005-03-23 | 重庆工学院 | Aluminium zinc series furface corrosion resistant coating structure of aluminium alloy prducts and preparation technology thereof |
| CN1940122A (en) * | 2005-09-30 | 2007-04-04 | 佛山市顺德区汉达精密电子科技有限公司 | Magnesium-alloy surface coating method |
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| CN1958846A (en) | 2007-05-09 |
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