CN104164641B - The high amorphous aluminum based metallic glass coating of multiple corrosion prevention function and preparation method - Google Patents
The high amorphous aluminum based metallic glass coating of multiple corrosion prevention function and preparation method Download PDFInfo
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Abstract
The high amorphous aluminum based metallic glass coating of multiple corrosion prevention function and preparation method, relate to activated combustion high-velocity air-fuel spraying layer field.Described amorphous powdered alloy is made up of following element and inevitable impurity: 3 ~ 10%Ni, 0.2 ~ 5%Co, 1.5 ~ 8%Y, 0.5 ~ 8%La, and all the other are Al.Powder diameter scope is 5 ~ 40 μm.The present invention prepares the aluminum based metallic glass coating of high content of amorphous, and preparation scheme solves the crystallization of amorphous aluminum alloy powder, and phase transformation and heat input the problem of the low and coating corrosion resistance difference of the coating content of amorphous that causes.Gained aluminum based metallic glass coating, be combined closely with matrix, porosity is low, amorphous degree is high, amorphous content reaches 30 ~ 75%, coating has satisfactory stability and mechanical property, has both excellent resistance to salts solution (NaCl), hydrochloric acid (HCl) and nitric acid (HNO simultaneously
3) performance of multiple corrosion prevention.
Description
Technical field
The invention belongs to metallic glass coating technology field, in particular to a kind of preparation method of aluminum based metallic glass coating, utilize activated combustion high-velocity air-fuel spraying technology on light alloy matrix, prepare the aluminum based metallic glass coating of high content of amorphous, the corrosive environment of Various Complex can be applied to.
Background technology
Compared with traditional crystalline material, metallic glass has the performance of many excellences, as high strength, high rigidity, large elastic strain limit, high corrosion resistance and excellent magnetic etc.And due to the weave construction of its uniqueness, efficiently preparation technology, good material property and wide application prospect, receive much concern in Materials science and industrial community at present.But common amorphous material due to critical cooling velocity very high by (~ 10
6k/s), therefore mostly can only prepare thickness in the band of micron dimension or powdered samples, greatly limit its range of application.Comparatively speaking, the process ratio preparing metallic glass coating is easier to realize, and compared with conventional coatings, metallic glass coating can be significantly improved in intensity, toughness, against corrosion, wear-resisting, thermal boundary and antifatigue etc., has above-mentioned multiple performance in some coatings concurrently.Prepare in the technique of metallic glass coating numerous, spraying technology has obvious competitive power, can prepare the functional coating of good quality efficiently.
Light alloy (Al, Mg alloy) although rich reserves, excellent performance, its due to its low electronegativity makes alloy corrosion resistance can be poor, therefore obtain large-scale application not yet so far as structured material.And corrosion on lightweight magnesium, aluminum alloy spare part and surface damage can bring out the problems such as section is thinning, intensity reduction, stress corrosion crack usually, cause equipment performance to decline to a great extent, have a strong impact on the usage safety of equipment.The major cause of above-mentioned light alloy surface damage is that the surface protecting layer adopted can not meet usage demand, what conventional surface protecting layer application was more is thermally sprayed coating, thermally sprayed coating in the past belongs to polycrystalline alloy, porosity is higher, in strong corrosive medium, effect is poor, is especially applied in high temperature, high humidity, the magnesium alloy of ocean environment of high salt fog and the aluminium alloy of strong nitric acid environment.Adopt the metallic glass coating prepared of thermospray then to have larger advantage: anticorrosive, resistance to wear, high-temperature resistance is strong, porosity is little, without the need to hole sealing agent, especially has more significant effect to the surface corrosion protection of magnesium, aluminium alloy.
The domestic and international research to metallic glass coated material at present concentrates on Ni-based system, iron-based system and Mo substrate system, and less to the research of aluminum based metallic glass.On the one hand because its amorphous formation ability of aluminum based metallic glass is limited, belong to edge metal glass system, therefore the high performance amorphous aluminum alloy material of more difficult preparation; Usually adopt thermospray to carry out the preparation of metallic glass coating on the other hand, and non-crystalline state aluminum alloy materials cause oxidation, the crystallization of coating forming procedure in thermospray because heat input is large, impact coating performance.Compare common aluminum alloy material, most of Al-based Amorphous Alloys has low density, high-modulus, tensile strength more than 1000MPa, because its chemical composition is even, almost without crystal boundary, dislocation etc.; The a large amount of anti-corrosion constituent element of energy solid solution, the coating therefore prepared has high-temperature behavior, high tenacity and anti-corrosion feature, and therefore aluminum based metallic glass coating has important Research Significance and wide application prospect.
In order to reduce to adopt conventional thermospray (as electric arc spraying, plasma spraying) to prepare in metallic glass coating procedure and cause anchoring strength of coating low, easily peel off, low and the problem of poor corrosion resistance that causes because porosity is high of amorphous degree, existing investigator adopts activated combustion high-velocity air-fuel spraying technology to prepare coating.As the patent No. patent of invention that is 201010575897.2 provides a kind of preparation method of iron-based amorphous coating, the method is utilized to prepare unique non-magnetic iron-based amorphous coating.This method has very high hardness for the preparation of iron-based amorphous coating, fine and close structure, low oxygen level and the solidity to corrosion of excellence.The preparation that its spraying technology adopted is applied to iron-based coating can obtain the amorphous coating of good quality, but due to spraying Al-based coating to spraying conditions and processing requirement strict, the technical scheme that therefore this patent provides can not be applied to spraying aluminium-based amorphous alloy coating.For the research of aluminium-based amorphous alloy coating, Acta Metallurgica Sinica, 2012,48 (3): 289-297 reports, the people such as Liang Xiubing adopt automatic high-speed arc spraying system, prepare Al-Ni-Y-Co amorphous nanocrystalline coating with the powder cored filament material developed voluntarily.But prepared coating porosity is higher, affect the corrosion resisting property of coating, and corrosion resistance nature is only considered in 5%NaCl solution, the consideration of corrosive nature is not comprehensive; Bonding strength is low is only 26.8MPa; And for causing the crystallization of material and phase research person all not to do to consider in electric arc spraying, therefore adopting arc spraying technology to prepare aluminum based metallic glass coating and still there are technological difficulties.
Content of amorphous in aluminum based metallic glass coating has material impact for the quality of coating, and content of amorphous not only affects the mechanical property of coating, and affects the wear and corrosion behavior of coating.Therefore, to need in coating preparation process Adjustment Tests technique to reduce the crystallization degree of coating forming procedure, thus prepare the strong anticorodal aluminum base metal glass coating having excellent mechanical performance concurrently.
Summary of the invention
The present invention adopts activated combustion high-velocity air-fuel spraying technology, the shortcoming of aluminum based metallic glass coating technology existence and the problem that coating content of amorphous is low, corrosion resisting property is poor of preparation is prepared for existing, the invention provides the technique and parameter of preparing aluminum based metallic glass coating, prepare and have that mechanical property is good, content of amorphous is high, have excellent resistance to salts solution (NaCl), hydrochloric acid (HCl) and nitric acid (HNO
3) the metallic glass coating of corrosive nature.
The high amorphous aluminum based metallic glass coating of multiple corrosion prevention function, is characterized in that, with Al based amorphous alloy powder for raw material, adopts the preparation of activated combustion high-velocity air-fuel spraying technology; Wherein, the elementary composition and atom percentage content of al based amorphous alloy powder is respectively: 3 ~ 10%Ni, 0.2 ~ 5%Co, 1.5 ~ 8%Y, 0.5 ~ 8%La, and all the other are Al; Powder diameter scope is 5 ~ 40 μm.
The preparation method of the high amorphous aluminum based metallic glass coating of described multiple corrosion prevention function, is characterized in that, adopts activated combustion high-velocity air-fuel spraying technology to prepare coating process step to be:
(1) pretreatment technology
Adopt baking oven to carry out drying the temperature 100 ~ 120 DEG C of powder, be incubated 1 ~ 1.5 hour, then powered-down, furnace cooling; Pre-treatment is carried out to the surface of matrix: first, use sherwood oil and acetone to remove grease and impurity; Then use the process of jet absorption type sand spray machine sand spray, require after sandblasting that surface derusting rank is Sa3, surface roughness Ra is 3 ~ 8 μm, finally blows off with pressurized air;
(2) path is sprayed
Workpiece to be sprayed to be placed on turntable and circumferential motion, and turntable set of frequency is 12.1 ~ 48.4Hz; Spray gun axes normal and turret axis, spray gun muzzle plane is parallel with sample tangent line, adopts the to-and-fro movement of robot controlling spray gun linear period;
(3) spray distance 120 ~ 240mm, air pressure 0.54 ~ 0.62MPa, propane pressure 0.43 ~ 0.51MPa, powder feeding rate 0.5 ~ 0.8g/s, spraying rate 9 ~ 13mm/s;
(4) adopt nitrogen powder feeding in spraying process, nitrogen flow is 30 ~ 40L/min; Hydrogen builds reducing atmosphere as fuel and reducing gas in spraying, and hydrogen flowing quantity is 30 ~ 40L/min;
(5) each spray time is 12 ~ 20s, and spraying is spaced apart 120 ~ 180s.
The present invention utilizes activated combustion high-velocity air-fuel spraying technology and technique to prepare aluminium-based amorphous alloy coating, need before spraying to carry out drying and processing to powder, if moisture content in powder, moisture meeting expanded by heating in spraying process, a large amount of pore can be formed in prepared coating, thus greatly reduce coating quality.Adopt baking oven to carry out drying the temperature of powder at 100 ~ 120 DEG C, be incubated 1 ~ 1.5 hour, then powered-down, furnace cooling.Need before spraying to carry out pre-treatment to the surface of matrix.First, be arranged on by body material on fixture, use sherwood oil and acetone repeatedly to rinse surface to remove grease and impurity, these impurity can play decisive influence to the bonding strength of coating and matrix, even cause disbonding; Then, with the process of jet absorption type sand spray machine sand spray, sandblasting adopts granularity to be 60 object Brown Alundum, compressed air pressure is 0.55MPa, sandblasting distance is 150 ~ 200mm, and sandblasting angle is 70 ~ 80 °, requires that surface derusting rank is Sa3 after sandblasting, surface roughness Ra is about 3 ~ 8 μm, finally blows off with pressurized air.
Spraying path is set to workpiece circumferential motion, the to-and-fro movement of spray gun linear period.Be placed in by workpiece on turntable, turntable set of frequency is 12.1 ~ 48.4Hz; Spray gun axes normal and turret axis, spray gun muzzle plane is parallel with sample tangent line, adopts the to-and-fro movement of robot controlling spray gun linear period.
Concrete spraying parameter is: spray distance 120 ~ 240mm, air pressure 0.54 ~ 0.62MPa, propane pressure 0.43 ~ 0.51MPa, powder feeding rate 0.5 ~ 0.8g/s, spraying rate 9 ~ 13mm/s.Adopt nitrogen powder feeding in spraying process, nitrogen flow is 30 ~ 40L/min; Hydrogen builds reducing atmosphere as fuel and reducing gas in spraying, and hydrogen flowing quantity is 30 ~ 40L/min.Each spray time is 12 ~ 20s, and spraying is spaced apart 120 ~ 180s, and spraying interval is in order to reduce heat accumulation in the base, and alleviate the formation of thermal stresses in coating, to prepare the coating of broad ranges of thicknesses, can prepare coat-thickness is 50 ~ 750 μm.
The present invention adopts activated combustion high-velocity air-fuel spraying technology.Adopt hydrogen as auxiliary fuel and reducing gas, improve heat content during burning, and form reducing atmosphere in spraying, decrease the oxidation in coating, crystallization and phase transformation.According to conventional HVOF spraying technology, at spraying process because oxygen is as combustion-supporting gas, then spraying flame temperature is high, heat large, because high speed impact and heat history can cause there is abundant residues stress in coating.For alumina-base material, adopt the coating prepared of HVOF should not be thicker, otherwise the warpage of coating can be caused, the problem such as to peel off.And the technical scheme described in the present invention can realize the preparation of thick coating, coat-thickness has a significant impact for the raising tool of corrosion resistance nature simultaneously.
The effect that the present invention is useful and Application Areas as follows:
1. the present invention adopts the aluminum-based alloy compositions with best glass forming ability.The powder sphericity adopted is high, good fluidity, and the alloying constituent of interpolation has the strong and constitutionally stable feature of amorphous formation ability, can be stable in coating there is amorphous phase.
2. the aluminum based metallic glass coating that obtains of the present invention, dense structure, interface is clear, and porosity is lower than 1.5%, and bonding strength reaches more than 40MPa; Amorphous degree is high, and amorphous content reaches 30 ~ 75%, and coating crystallization temperature reaches more than 300 DEG C.
3. coating has satisfactory stability and excellent corrosion resistance nature.Have multiple anti-corrosion function: in NaCl solution, coating has higher corrosion potential, shows good anti-corrosion capability; In HCl solution, the coating that content of amorphous is higher has more excellent corrosion resistance; At HNO
3solution, coating provides the effect of sacrificial protection matrix, and can avoid strong galvanic corrosion problem.Prepared coating can be widely used in having the fields such as aerospace that multiple corrosive medium exists and naval vessel, ocean.
Accompanying drawing explanation
Accompanying drawing 1 is the SEM photo of Al base metal glass powder.
Accompanying drawing 2 is the TEM photo of a-quadrant in the SEM photo of comparative example 1 and embodiment 1 floating coat and embodiment 1 coating.
Accompanying drawing 3 is comparative example 1 and embodiment 1 coating and amorphous ribbon X ray diffracting spectrum completely.
Accompanying drawing 4 is comparative example 1 and embodiment 1 coating and amorphous ribbon DSC curve completely.
Accompanying drawing 5 is #1 ~ #4 coating and the dynamic potential polarization curve of ZM5 matrix in 0.1mol/LHCl solution.
Accompanying drawing 6 is #1 ~ #4 coating and the dynamic potential polarization curve of ZM5 matrix in 0.6mol/LHCl solution.
Accompanying drawing 7 is that #5 ~ #8 coating and 2024 alloy matrix aluminums are at 4mol/LHNO
3dynamic potential polarization curve in solution.
Accompanying drawing 8 is that #5 ~ #8 coating and 2024 alloy matrix aluminums are at 8mol/LHNO
3dynamic potential polarization curve in solution.
Accompanying drawing 9 is #1 ~ #4 coating and the dynamic potential polarization curve of ZM5 matrix in 0.06mol/LNaCl solution.
Accompanying drawing 10 is #1 ~ #4 coating and the dynamic potential polarization curve of ZM5 matrix in 0.6mol/LNaCl solution.
Subordinate list 1 is the mechanical property of comparative example 1 and embodiment 1 coating and the Data Comparison of content of amorphous.
Embodiment
The present invention is achieved by the following measures:
Comparative example 1:
The composition of aluminium base multi-element amorphous alloy powder is by weight percentage: 3.5%Ni, 1.2%Co, 2.5%Y, 4%La, and all the other are Al, and powder diameter scope is 5 ~ 40 μm.Powder and substrate pretreated adopt aforementioned schemes, make matrix roughness Ra be about 5 μm.Adopt HVOF spraying technology to spray, spraying path is sample circumferential motion, and turntable frequency is 36.3Hz, the upper and lower periodic motion of spray gun, and single pass spray time is 20s, sprays 12 times.Spray parameters is: spray distance 160mm, oxygen pressure 0.65MPa, propane pressure 0.53MPa, powder feeding rate 0.6g/s, spraying rate 13mm/s.Nitrogen, hydrogen flowing quantity are 35L/min.
Embodiment 1:
The composition of aluminium base multi-element amorphous alloy powder is by weight percentage: 3.5%Ni, 1.2%Co, 2.5%Y, 4%La, and all the other are Al, and powder diameter scope is 5 ~ 40 μm.Powder adopts the scheme identical with comparison example with substrate pretreated, makes matrix roughness Ra be about 5 μm.Adopt activated combustion high-velocity air-fuel spraying technology to spray, spraying path is sample circumferential motion, and turntable frequency is 36.3Hz, the upper and lower periodic motion of spray gun, and single pass spray time is 20s, spraying pass 8 times.Spray parameters is: spray distance 160mm, air pressure 0.59MPa, propane pressure 0.49MPa, powder feeding rate 0.6g/s, spraying rate 13mm/s.Nitrogen, hydrogen flowing quantity are 35L/min.
Embodiment 2:
The composition of aluminium base multi-element amorphous alloy powder is by weight percentage: 3%Ni, 5%Co, 8%Y, 0.5%La, and all the other are Al, and powder diameter scope is 5 ~ 40 μm.Powder and substrate pretreated adopt scheme in the same manner as in Example 1, make matrix roughness Ra be about 5 μm.Adopt activated combustion high-velocity air-fuel spraying technology to spray, spraying path is sample circumferential motion, and turntable frequency is 18.6Hz, the upper and lower periodic motion of spray gun.Single pass spray time is 16s, spraying pass 12 times.Spray parameters is: spray distance 120mm, air pressure 0.54MPa, propane pressure 0.51MPa, powder feeding rate 0.5g/s, spraying rate 10mm/s.Nitrogen, hydrogen flowing quantity are 30L/min.
Embodiment 3:
The composition of aluminium base multi-element amorphous alloy powder is by weight percentage: 10%Ni, 0.8%Co, 1.5%Y, 8%La, and all the other are Al, and powder diameter scope is 5 ~ 40 μm.Powder and substrate pretreated adopt scheme in the same manner as in Example 1, make matrix roughness Ra be about 5 μm.Adopt activated combustion high-velocity air-fuel spraying technology to spray, spraying path is sample circumferential motion, and turntable frequency is 46.4Hz, the upper and lower periodic motion of spray gun, and single pass spray time is 12s, spraying pass 14 times.Spray parameters is: spray distance 120mm, air pressure 0.62MPa, propane pressure 0.43MPa, powder feeding rate 0.8g/s, spraying rate 9mm/s.Nitrogen, hydrogen flowing quantity are 40L/min.
Embodiment 4:
Adopt technical scheme as described in comparative example 1 and embodiment 1 ~ 3, ZM5 magnesium alloy substrate is prepared #1 ~ #4 coating, and test the potentiodynamic polarization process of 4 kinds of coatings in 0.1mol/LHCl solution, and contrast with matrix, result as shown in Figure 5.
Embodiment 5:
Adopt technical scheme as described in comparative example 1 and embodiment 1 ~ 3, ZM5 magnesium alloy substrate is prepared #1 ~ #4 coating, and test the potentiodynamic polarization process of 4 kinds of coatings in 0.6mol/LHCl solution, and contrast with matrix, result as shown in Figure 6.
Embodiment 6:
Adopt technical scheme as described in comparative example 1 and embodiment 1 ~ 3,2024 alloy matrix aluminums are prepared #5 ~ #8 coating, to 4 kinds of coatings at 4mol/LHNO
3potentiodynamic polarization process in solution is tested, and contrasts with matrix, and result as shown in Figure 7.
Embodiment 7:
Adopt technical scheme as described in comparative example 1 and embodiment 1 ~ 3,2024 alloy matrix aluminums are prepared #5 ~ #8 coating, to 4 kinds of coatings at 8mol/LHNO
3potentiodynamic polarization process in solution is tested, and contrasts with matrix, and result as shown in Figure 8.
Embodiment 8:
Adopt technical scheme as described in comparative example 1 and embodiment 1 ~ 3, ZM5 magnesium alloy substrate is prepared #1 ~ #4 coating, and test the potentiodynamic polarization process of 4 kinds of coatings in 0.06mol/LNaCl solution, and contrast with matrix, result as shown in Figure 9.
Embodiment 9:
Adopt technical scheme as described in comparative example 1 and embodiment 1 ~ 3, ZM5 magnesium alloy substrate is prepared #1 ~ #4 coating, and test the potentiodynamic polarization process of 4 kinds of coatings in 0.6mol/LNaCl solution, and contrast with matrix, result as shown in Figure 10.
Result and analysis:
Coating prepared by the coating prepare comparative example 1 technical scheme and embodiment 1 technical scheme is analyzed.
The microscopic appearance of dusty spray and coating
LEOSupra35, CambridgeS360 and Quanta600 scanning electronic microscope (SEM) that employing is furnished with power spectrum (EDX) annex carries out tissue topography's observation, and voltage is 25kV.Fig. 1 is the pattern SEM photo of Al base amorphous dusty spray, can find out that powder is spherical in shape, good fluidity.The coating SEM photo that Fig. 2 (a) is prepared for comparative example 1 technical scheme, the coating SEM photo that Fig. 2 (b) is prepared for embodiment 1 technical scheme, the TEM photo of the coating a-quadrant that Fig. 2 (c) is prepared for embodiment 1 technical scheme and corresponding selected area electron diffraction figure.Analyze known: the coating complete crystallization adopting comparative example 1 technical scheme to prepare, do not observe obvious space, coating compactness is good, and there is crystal phase precipitate, the precipitate of white contrast is ɑ-Al phase by analysis.Adopt coating layer portion crystallization prepared by embodiment 1 technical scheme, coating is fine and close, without obvious hole, through hole and crackle.In the TEM dark field image in coating A district, sample is not finding contrast difference, shows higher composition and structure homogeneity; Selected diffraction collection of illustrative plates, also in dispersing ring-type, shows that this region is complete amorphous.
The heterogeneous microstructure of coating
Adopt Japan produce RigakuD/max2400 diffractometer test comparative example 1 and embodiment 1 coating and complete amorphous ribbon X ray diffracting spectrum, as shown in Figure 3.Adopt CuK alpha-ray source (λ=0.1542nm), and be furnished with monochromator, power is 12kW, and tube voltage is 50kV, and electric current is 100mA, and stepping is 0.02 °.Contrasting complete amorphous ribbon analyzes known: complete crystallization in comparative example 1 in Fig. 3, and Crystallization Phases is α-Al mainly, also has some unascertainable intermetallic compounds; In embodiment 1,2 θ angles are that 30 ~ 50 ° of intervals exist typical amorphous bag, occurred Crystallization Phases, be respectively Al in coating
4niY phase and α-Al phase.
The thermostability of coating
Adopt the glass transition and crystallization behavior of Perkin-ElmerDSC-7 to sample to characterize, pass into the protectiveness high-purity argon gas of the flowing of 0.05L/min flow, continuous warming pattern adopts 20 DEG C/min heating rate, the highest 1200 DEG C.Thermal analyzer determines the DSC curve of complete amorphous ribbon, comparative example 1 and embodiment 1 floating coat, and experimental data as shown in Figure 4.Analyze known: amorphous ribbon exists two obvious crystallization exothermic peaks completely, has complete non-crystal structure; Exothermic peak area reduces by comparison to some extent in embodiment 1, show that crystallization change to a certain degree occurs coating in preparation process, initial crystallization temperature is about 304 DEG C, and this shows that coating is stable below 304 DEG C, crystallization process can not occur, coating has satisfactory stability; The DSC curve of comparative example 1 is unchanged, shows coating complete crystallization.And calculate content of amorphous in comparative example 1, embodiment 1 according to DSC result.
The mechanical property of coating and content of amorphous
Test the coat-thickness prepared in comparative example 1, embodiment 1, bonding strength and microhardness, and calculate the content of amorphous of coating, result is as shown in table 1.Analyze known: due to the HVOF technology adopted in comparative example 1, although almost consistent with the process program of embodiment 1, and when coat-thickness is close, there is larger gap in hardness and content of amorphous, therefore described technology and technical scheme remarkable for the preparation of high amorphous aluminum based metallic glass coating result.
The corrosion resistance nature of coating
Electrochemistry integrated test system Potentiostat/Galvanostat (EG & GPrincetonAppliedResearchModel2273) is adopted to test the electrochemical properties of coating, sample size is 12 × 12mm, electrochemistry dynamic potential scanning is carried out in coating corrosion, with the potential scan rate anodic polarization of 0.333mV/s, to-100mV
sCEor current density reaches 10
-2a/cm
2in time, stops scanning.
Embodiment 4 to embodiment 9 is for recording the polarization curve of the potentiodynamic polarization process of coating.
Analyze known: #1 ~ #4 coating and ZM5 matrix show rapid solution behavior in HCl solution, all do not occur passivation behavior.In the HCl solution of lower concentration, the coating that non-crystallization degree is high has higher corrosion potential, and the highest #2 coating corrosion potential of content of amorphous is the highest; Along with the increase of HCl strength of solution, matrix and complete crystallization coating (#1) do not have complete polarization curve, and similar, decrystallized coatings goes out good corrosion resisting property.
#5 ~ #8 coating and 2024 alloy matrix aluminums are at HNO
3solutions display goes out Rapid deactivation behavior.At the HNO of 4mol/L
3in solution, the passivation current of matrix is lower, is easy to form passive film, and under the same terms, coating is easier to dissolve, corrode, and forms protection to matrix.At the HNO of 8mol/L
3in solution, the corrosion potential of coating is greater than matrix, and therefore when forming galvanic corrosion with steel part, matrix is protected.
#1 ~ #4 coating and ZM5 matrix are in 0.06mol/LNaCl solution, and the #2 coating of high content of amorphous has obvious passivation behavior, and passivation current is lower, more easily forms passive film.The cated corrosion potential of institute is higher than ZM5 matrix, and corrosion current is lower than ZM5 matrix, can play a good protection to matrix.In 0.6mol/LNaCl solution, coatings and substrate all present rapid solution, and occur without passivation region, but the corrosion potential of coating is apparently higher than ZM5 matrix, shows that coating can form provide protection to matrix.
As described above by the description of the drawings and corresponding embodiment, the present invention is described.But be understood that wherein in instances about body material, spraying coating process and parameter description and do not mean that and limit the invention to particular forms disclosed, this example is only open in an illustrative manner, unless otherwise specified.
Table 1
Claims (1)
1. the preparation method of the high amorphous aluminum based metallic glass coating of multiple corrosion prevention function, this coating for raw material, adopts the preparation of activated combustion high-velocity air-fuel spraying technology with Al based amorphous alloy powder; Wherein, the elementary composition and atom percentage content of al based amorphous alloy powder is respectively: 3 ~ 10%Ni, 0.2 ~ 5%Co, 1.5 ~ 8%Y, 0.5 ~ 8%La, and all the other are Al; Powder diameter scope is 5 ~ 40 μm;
It is characterized in that, employing activated combustion high-velocity air-fuel spraying technology is prepared coating process step and is:
(1) pretreatment technology
Adopt baking oven to carry out drying the temperature 100 ~ 120 DEG C of powder, be incubated 1 ~ 1.5 hour, then powered-down, furnace cooling; Pre-treatment is carried out to the surface of matrix: first, use sherwood oil and acetone to remove grease and impurity; Then use the process of jet absorption type sand spray machine sand spray, require after sandblasting that surface derusting rank is Sa3, surface roughness Ra is 3 ~ 8 μm, finally blows off with pressurized air;
(2) path is sprayed
Workpiece to be sprayed to be placed on turntable and circumferential motion, and turntable set of frequency is 12.1 ~ 48.4Hz; Spray gun axes normal and turret axis, spray gun muzzle plane is parallel with sample tangent line, adopts the to-and-fro movement of robot controlling spray gun linear period;
(3) spray distance 120 ~ 240mm, air pressure 0.54 ~ 0.62MPa, propane pressure 0.43 ~ 0.51MPa, powder feeding rate 0.5 ~ 0.8g/s, spraying rate 9 ~ 13mm/s;
(4) adopt nitrogen powder feeding in spraying process, nitrogen flow is 30 ~ 40L/min; Hydrogen builds reducing atmosphere as fuel and reducing gas in spraying, and hydrogen flowing quantity is 30 ~ 40L/min;
(5) each spray time is 12 ~ 20s, and spraying is spaced apart 120 ~ 180s.
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| CN106148948A (en) * | 2016-07-18 | 2016-11-23 | 中国人民解放军装甲兵工程学院 | Aluminum based metallic glass cladding layer and preparation method thereof |
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| CN110938786A (en) * | 2019-06-20 | 2020-03-31 | 中国科学院金属研究所 | High-corrosion-resistance Al-TM-RE amorphous aluminum alloy |
| CN110455881A (en) * | 2019-07-25 | 2019-11-15 | 东莞东阳光科研发有限公司 | A kind of test method of aluminium alloy open circuit potential |
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| CN102041468A (en) * | 2010-12-07 | 2011-05-04 | 华中科技大学 | Preparation method of iron-based amorphous coating |
| CN103352198A (en) * | 2013-06-26 | 2013-10-16 | 中国人民解放军装甲兵工程学院 | Cored wire of Al-Ni-Mm-Co amorphous nanocrystalline composite coating prepared through high-speed electric arc spraying |
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| CN103352198A (en) * | 2013-06-26 | 2013-10-16 | 中国人民解放军装甲兵工程学院 | Cored wire of Al-Ni-Mm-Co amorphous nanocrystalline composite coating prepared through high-speed electric arc spraying |
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