CN104005073B - Preparation method of low-solar-absorptance high-emissivity coating on surface of titanium alloy TC4 - Google Patents
Preparation method of low-solar-absorptance high-emissivity coating on surface of titanium alloy TC4 Download PDFInfo
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Abstract
The invention discloses a preparation method of a low-solar-absorptance high-emissivity coating on the surface of titanium alloy TC4, relates to a preparation method of a ceramic film layer on the surface of the titanium alloy TC4, and aims at solving the problems that a titanium alloy thermal control coating prepared by adopting an existing method is high in solar absorptance, low in emissivity and high in cost, a uniform coating is difficultly obtained for the surface with a complicated shape, a process is complicated and the bonding degree between the coating and a matrix body is poor. The preparation method comprises the following steps: 1, pre-processing the titanium alloy TC4; and 2, performing micro-arc oxidation. The coating prepared by adopting the method has the roughness of 4.056 microns to 13.66 microns and the thickness of 68.1 microns to 200 microns, and the thickness of the coating is adjustable; due to in-situ growth, the bonding degree is good; the emissivity of a film layer under process conditions of a highly acidic zirconate system is more than 0.96, and the absorption rate is less than 0.32.
Description
Technical field
The present invention relates to the preparation method of a kind of titanium alloy TC 4 surface ceramic film layer.
Background technology
Titanium alloy TC 4 has good combination property, as structure stability is good, toughness is good, plasticity is preferable and excellent
Decay resistance, be increasingly becoming spacecraft, aircraft and guided missile etc. and manufactured material.And spacecraft (such as satellite, flies
Ship, lunar rover) during actual space flight, there is its sunny slope temperature higher, opaco temperature is relatively low, institute's warp
The problem that the variation of ambient temperature gone through may be up to hundreds of degree.Internal unit to be ensured and instrument operate normally and work, thermal control
System is essential.Thermal control coating is to apply one of most protective material in heat control system.It is by instrumentality surface
Solar absorptance and infrared emittance regulate the thermal balance of interior of articles processed.At present, the most a large amount of thermal controls used are coated with
Layer has a two types, and a kind of is the sun diffuse-reflectance thermal control coating of low SAR；Another kind is the infrared band of high-selenium corn ratio
Thermal control coating.Thermal control coating is usually through regulating surface of the work heat-radiating properties and optical property to reach the function of thermal control purpose
Coating, this is to solve one of key technologies of thermal control problem such as spacecraft, spacecraft, aircraft and guided missile.
Spacecraft uses the thermal control coating of preferably at most low absorption transmitting ratio at present.Currently there are three type coatings can meet this wanting
Ask: white paint, second surface mirror type coating, ceramic-like protective coating.Method that the preparation of this thermal control coating is conventional and technology are such as
Chemical gaseous phase deposits, electro beam physics vapour deposition, magnetron sputtering, sol-gal process, ion implantation, plasma spraying
Deng, all there is respective shortcoming or deficiency in these methods, as high in isoionic spraying cost, and the surface to complicated shape
The uniform coating of difficult acquisition, sol-gal process complex technical process, coating is more weak with substrate combinating strength, unstable etc..
Summary of the invention
The invention aims to solve titanium alloy thermal control coating prepared by existing method, to there is solar absorptance high, emissivity
Low, cost is high, and the surface difficulty of complicated shape is obtained uniform coating, complex process and ask weak with matrix conjugation of coating
Topic, and the preparation method of a kind of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating is provided.
A kind of preparation method of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating, the completeest
Become:
One, titanium alloy TC 4 pre-treatment: use 60# dry sand paper, 240# silicon carbide paper and the water milling of 400# the most successively
Paper carries out grinding process to titanium alloy TC 4, then uses NaOH solution to remove the oil on titanium alloy TC 4 surface, then with steaming
Distilled water is cleaned, and hair dryer dries up, the titanium alloy TC 4 after being processed；
NaOH solution described in step one is mixed by NaOH and distilled water, and the quality of described NaOH and steaming
The volume ratio of distilled water is (8g～10g): 1L；
Two, differential arc oxidation: the titanium alloy TC 4 after processing is placed in stainless electrolyte, titanium alloy TC 4 and power supply
Positive pole be connected, as anode, stainless steel electrolytic groove is connected with the negative pole of power supply, as negative electrode；Use the pulse differential of the arc
Oxidation power supply is powered, and is 6A/dm in electric current density2～14A/dm2, supply frequency be 50Hz～500Hz, dutycycle be
10%～45%, the temperature of electrolyte be the pH value of 20 DEG C～40 DEG C and electrolyte be differential arc oxidation under conditions of 0.54～7.88
Reaction 3min～70min, obtains titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating；
Electrolyte described in step 2 is made up of main film former and secondary film formers, and solvent is water；Main one-tenth in described electrolyte
The concentration of membrane is 3g/L～8g/L, and the concentration of secondary film formers is 0.3g/L～10g/L.
Advantages of the present invention:
One, the present invention utilizes the method for micro-plasma oxidation to grow ceramic film at titanium alloy TC 4 surface in situ, should
Coating has the characteristic of low sunlight absorptivity high emissivity, owing to being growth in situ, thus strong with the adhesion of substrate；
Two, a kind of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating that prepared by the present invention is ceramic film, therefore
Heat stability is the most fine in the event of high temperatures, it is possible to well compensate for the conventional coating defect at thermally-stabilised aspect；
Three, the present invention uses differential arc oxidization technique to prepare coating, the ion during element mostlys come from matrix and solution in coating,
And micro-arc oxidation process completes in the electrolytic solution, thus just can by regulation solution in solute regulate film layer element and
Phase composition, the film layer that preparation function is excellent；
Four, titanium alloy TC 4 of the present invention uses differential arc oxidation to process, and solves asking of titanium alloy TC 4 thermal control to a certain extent
Topic；A kind of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating appearance prepared by the present invention is white, uniformly beautiful
Seeing, coating layer thickness reaches 68.1 μm～200 μm, and thickness is adjustable, and owing to being growth in situ, therefore it is good to have adhesion, anti-
The characteristic that thermal shock performance is good, and under the process conditions of highly acid zirconates system, the emissivity of film layer, more than 0.96, absorbs
Rate is less than 0.32；Under faintly acid zirconates system, emissivity between 0.885～0.91, absorbance 0.335～0.4 it
Between；Under alkalescence zirconates system, the emissivity of film layer is substantially 0.95～0.98, and absorbance is between 0.285～0.4；
A kind of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating roughness prepared by the present invention is 4.056 μm
～13.66 μm；
Five, coating prepared by the present invention is under the conditions of temperature is 500 DEG C, is incubated 3min, places in water and cools down, instead
Carrying out thermal shock again to test 40 times, coating does not falls off, and shows that the coating obtained by the present invention has excellent adhesion and heat is steady
Qualitative.
The present invention can obtain the preparation method of a kind of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating.
Accompanying drawing explanation
Fig. 1 is the SEM figure of the titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating of embodiment one preparation；
Fig. 2 is the SEM figure of the titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating of embodiment two preparation；
Fig. 3 is the SEM figure of the titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating of embodiment three preparation；
Fig. 4 is that the titanium alloy TC 4 surface low sunlight absorptivity high emissivity of titanium alloy TC 4 and embodiment one to three preparation is coated with
The XRD figure of layer；In figure, a is the XRD figure of titanium alloy TC 4, and b is the titanium alloy TC 4 surface of embodiment one preparation
The XRD figure of low sunlight absorptivity high emissivity coating, c is that the low sun in titanium alloy TC 4 surface of embodiment two preparation absorbs
The XRD figure of rate high emissivity coating, d is the titanium alloy TC 4 surface low sunlight absorptivity high emissivity of embodiment three preparation
The XRD figure of coating, " ■ " represents KZr2(PO4)3, " ◆ " represents K3Zr1..5(PO4)3, " " represents Zr0.2Ti0.8P2O7,Represent K5Zr(PO4)3, "●" represents Ti.
Detailed description of the invention
Detailed description of the invention one: present embodiment is a kind of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating
Preparation method, is specifically realized by the following steps:
One, titanium alloy TC 4 pre-treatment: use 60# dry sand paper, 240# silicon carbide paper and the water milling of 400# the most successively
Paper carries out grinding process to titanium alloy TC 4, then uses NaOH solution to remove the oil on titanium alloy TC 4 surface, then with steaming
Distilled water is cleaned, and hair dryer dries up, the titanium alloy TC 4 after being processed；
NaOH solution described in step one is mixed by NaOH and distilled water, and the quality of described NaOH and steaming
The volume ratio of distilled water is (8g～10g): 1L；
Two, differential arc oxidation: the titanium alloy TC 4 after processing is placed in stainless electrolyte, titanium alloy TC 4 and power supply
Positive pole be connected, as anode, stainless steel electrolytic groove is connected with the negative pole of power supply, as negative electrode；Use the pulse differential of the arc
Oxidation power supply is powered, and is 6A/dm in electric current density2～14A/dm2, supply frequency be 50Hz～500Hz, dutycycle be
10%～45%, the temperature of electrolyte be the pH value of 20 DEG C～40 DEG C and electrolyte be differential arc oxidation under conditions of 0.54～7.88
Reaction 3min～70min, obtains titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating；
Electrolyte described in step 2 is made up of main film former and secondary film formers, and solvent is water；Main one-tenth in described electrolyte
The concentration of membrane is 3g/L～8g/L, and the concentration of secondary film formers is 0.3g/L～10g/L.
Present embodiment step one use successively the silicon carbide paper of 60# dry sand paper, 240# silicon carbide paper and 400# to titanium alloy
TC4 carries out grinding process, smooth to titanium alloy TC 4 smooth surface.
The advantage of present embodiment:
One, present embodiment utilizes the method for micro-plasma oxidation to grow ceramic film at titanium alloy TC 4 surface in situ,
This coating has the characteristic of low sunlight absorptivity high emissivity, owing to being growth in situ, thus strong with the adhesion of substrate；
Two, a kind of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating that prepared by present embodiment is ceramic film,
Therefore heat stability is the most fine in the event of high temperatures, it is possible to well compensate for the conventional coating defect at thermally-stabilised aspect；
Three, present embodiment uses differential arc oxidization technique to prepare coating, during element mostlys come from matrix and solution in coating
Ion, and micro-arc oxidation process completes in the electrolytic solution, so just can regulate film layer by the solute in regulation solution
Element and phase composition, the film layer that preparation function is excellent；
Four, present embodiment titanium alloy TC 4 uses differential arc oxidation to process, and solves titanium alloy TC 4 thermal control to a certain extent
Problem；A kind of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating appearance prepared by the present invention is white, all
Even attractive in appearance, coating layer thickness reaches 68.1 μm～200 μm, and thickness is adjustable, and owing to being growth in situ, therefore it is good to have adhesion,
The characteristic that thermal shock resistance is good, and under the process conditions of highly acid zirconates system, the emissivity of film layer, more than 0.96, is inhaled
Yield is less than 0.32；Under faintly acid zirconates system, emissivity is between 0.885～0.91, and absorbance is 0.335～0.4
Between；Under alkalescence zirconates system, the emissivity of film layer is substantially 0.95～0.98, and absorbance is between 0.285～0.4；
A kind of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating roughness prepared by the present invention is 4.056 μm
～13.66 μm；
Five, coating prepared by present embodiment is under the conditions of temperature is 500 DEG C, is incubated 3min, places in water and cools down,
Thermal shock being repeated test 40 times, coating does not falls off, and shows that the coating obtained by the present invention has excellent adhesion and heat
Stability.
This detailed description of the invention can obtain the preparation side of a kind of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating
Method.
Detailed description of the invention two: present embodiment with detailed description of the invention one difference is: the NaOH described in step one
Quality is 10g:1L with the volume ratio of distilled water.Other steps are identical with detailed description of the invention one.
Detailed description of the invention three: present embodiment with one of detailed description of the invention one or two difference is: will process in step 2
After titanium alloy TC 4 be placed in stainless electrolyte, titanium alloy TC 4 is connected with the positive pole of power supply, as anode,
Stainless steel electrolytic groove is connected with the negative pole of power supply, as negative electrode；Pulse mao power source is used to power, in electric current density
For 8A/dm2～14A/dm2, supply frequency be 100Hz～500Hz, dutycycle be 20%～45%, the temperature of electrolyte is
The pH value of 20 DEG C～40 DEG C and electrolyte is differential arc oxidation reaction 3min～4.5min under conditions of 0.54～1.Other steps with
Detailed description of the invention one or two is identical.
Detailed description of the invention four: present embodiment with one of detailed description of the invention one to three difference is: will process in step 2
After titanium alloy TC 4 be placed in stainless electrolyte, titanium alloy TC 4 is connected with the positive pole of power supply, as anode；
Stainless steel electrolytic groove is connected with the negative pole of power supply, as negative electrode, uses pulse mao power source to power, in electric current density
For 8A/dm2～12A/dm2, supply frequency be 300Hz～500Hz, dutycycle be 10%～35%, the temperature of electrolyte is
The pH value of 20 DEG C～40 DEG C and electrolyte is differential arc oxidation reaction 61min～70min under conditions of 0.54～1.Other steps with
Detailed description of the invention one to three is identical.
Detailed description of the invention five: present embodiment with one of detailed description of the invention one to four difference is: will process in step 2
After titanium alloy TC 4 be placed in stainless electrolyte, titanium alloy TC 4 is connected with the positive pole of power supply, as anode；
Stainless steel electrolytic groove is connected with the negative pole of power supply, as negative electrode, uses pulse mao power source to power, in electric current density
For 10A/dm2～14A/dm2, supply frequency be 400Hz～500Hz, dutycycle be 10%～15%, the temperature of electrolyte is
The pH value of 20 DEG C～40 DEG C and electrolyte is differential arc oxidation reaction 20min～55min under conditions of 1～5.Other steps and tool
Body embodiment one to four is identical.
Detailed description of the invention six: present embodiment with one of detailed description of the invention one to five difference is: the master described in step 2
Film former is potassium fluorozirconate.Other steps are identical with detailed description of the invention one to five.
Detailed description of the invention seven: present embodiment with one of detailed description of the invention one to six difference is: auxiliary described in step 2
Furtherance membrane is sodium dihydrogen phosphate, phosphoric acid, sodium hypophosphite, sodium hexameta phosphate, sodium polyphosphate, disodium hydrogen phosphate and phosphorus
A kind of or the most several mixture in acid trisodium.Other steps are identical with detailed description of the invention one to six.
When described secondary film formers is mixture, in mixture, each component is mixed by any ratio.
Detailed description of the invention eight: present embodiment with one of detailed description of the invention one to seven difference is: the electricity described in step 2
Solving the concentration of main film former in liquid is 4g/L～6g/L, and the concentration of secondary film formers is 0.3g/L～0.4g/L.Other steps and tool
Body embodiment one to seven is identical.
Detailed description of the invention nine: present embodiment with one of detailed description of the invention one to eight difference is: the electricity described in step 2
Solving the concentration of main film former in liquid is 3g/L～4g/L, and the concentration of secondary film formers is 2g/L～4g/L.Other steps are with concrete
Embodiment one to eight is identical.
Detailed description of the invention ten: present embodiment with one of detailed description of the invention one to nine difference is: the electricity described in step 2
Solving the concentration of main film former in liquid is 3g/L～8g/L, and the concentration of secondary film formers is 3g/L～5g/L.Other steps are with concrete
Embodiment one to nine is identical.
Employing following example checking beneficial effects of the present invention:
Embodiment one: the preparation method of a kind of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating, specifically presses
Following steps complete:
One, titanium alloy TC 4 pre-treatment: use 60# dry sand paper, 240# silicon carbide paper and the water milling of 400# the most successively
Paper carries out grinding process to titanium alloy TC 4, then uses NaOH solution to remove the oil on titanium alloy TC 4 surface, then with steaming
Distilled water is cleaned, and hair dryer dries up, the titanium alloy TC 4 after being processed；
NaOH solution described in step one is mixed by NaOH and distilled water, and the quality of described NaOH and steaming
The volume ratio of distilled water is 10g:1L；
Two, differential arc oxidation: the titanium alloy TC 4 after processing is placed in stainless electrolyte, titanium alloy TC 4 and power supply
Positive pole be connected, as anode, stainless steel electrolytic groove is connected with the negative pole of power supply, as negative electrode；Use the pulse differential of the arc
Oxidation power supply is powered, and is 14A/dm in electric current density2, supply frequency be 50Hz, dutycycle be 45%, the temperature of electrolyte
Degree be the pH value of 30 DEG C and electrolyte be differential arc oxidation reaction 20min under conditions of 1.24, obtain titanium alloy TC 4 surface
Low sunlight absorptivity high emissivity coating；
Electrolyte described in step 2 is made up of main film former and secondary film formers, and solvent is water；Described main film former is fluorine
Potassium zirconium, in electrolyte, the concentration of potassium fluorozirconate is 6g/L；Described secondary film formers is the mixed of sodium hypophosphite and phosphoric acid
Compound, concentration 0.5g/L of sodium hypophosphite in electrolyte, in electrolyte, phosphoric acid is 2ml/L.
Titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating prepared by the present embodiment under the conditions of temperature is 500 DEG C,
Insulation 3min, places in water and cools down, and thermal shock is repeated and tests 40 times, and coating does not falls off, and the present embodiment system is described
Standby coating has excellent adhesion and heat stability.
The thickness of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating prepared by the present embodiment is 166 μm, coarse
Degree is 11.07 μm, and solar absorptance is 0.237, and hemispherical emissivity is 0.99.
SEM photograph such as Fig. 1 institute of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating prepared by the present embodiment
Show.Fig. 1 is the SEM figure of the titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating of embodiment one preparation；From figure
Obtained film layer knowable to 1 is all to be formed by a lot of particle packings, and surface is rougher, spurting aperture, film surface volcano
Substantially.
Embodiment two: the preparation method of a kind of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating, specifically presses
Following steps complete:
One, titanium alloy TC 4 pre-treatment: use 60# dry sand paper, 240# silicon carbide paper and the water milling of 400# the most successively
Paper carries out grinding process to titanium alloy TC 4, then uses NaOH solution to remove the oil on titanium alloy TC 4 surface, then with steaming
Distilled water is cleaned, and hair dryer dries up, the titanium alloy TC 4 after being processed；
NaOH solution described in step one is mixed by NaOH and distilled water, and the quality of described NaOH and steaming
The volume ratio of distilled water is 8g:1L；
Two, differential arc oxidation: the titanium alloy TC 4 after processing is placed in stainless electrolyte, titanium alloy TC 4 and power supply
Positive pole be connected, as anode, stainless steel electrolytic groove is connected with the negative pole of power supply, as negative electrode；Use the pulse differential of the arc
Oxidation power supply is powered, and is 8A/dm in electric current density2, supply frequency be 50Hz, dutycycle be 45%, the temperature of electrolyte
Be the pH value of 30 DEG C and electrolyte be differential arc oxidation reaction 50min under conditions of 5.68, obtain titanium alloy TC 4 surface low
Solar absorptance high emissivity coating；
Electrolyte described in step 2 is made up of main film former and secondary film formers, and solvent is water；Described main film former is fluorine
Potassium zirconium, in electrolyte, the concentration of potassium fluorozirconate is 4g/L；Described secondary film formers is sodium dihydrogen phosphate, in electrolyte
Concentration 5g/L of sodium dihydrogen phosphate.
Titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating prepared by the present embodiment under the conditions of temperature is 500 DEG C,
Insulation 3min, places in water and cools down, and thermal shock is repeated and tests 40 times, and coating does not falls off, and the present embodiment system is described
Standby titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating has excellent adhesion and heat stability.
The thickness of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating prepared by the present embodiment is 68.1 μm, coarse
Degree is 7.8 μm, and solar absorptance is 0.34, and hemispherical emissivity is 0.91.
SEM photograph such as Fig. 2 institute of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating prepared by the present embodiment
Show.Fig. 2 is the SEM figure of the titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating of embodiment two preparation；From figure
2 understand film surface a large amount of crateriform deposit, and in ejection shape, surface apertures is more not of uniform size, and partial hole is even
Together.
Embodiment three: the preparation method of a kind of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating, specifically presses
Following steps complete:
One, titanium alloy TC 4 pre-treatment: use 60# dry sand paper, 240# silicon carbide paper and the water milling of 400# the most successively
Paper carries out grinding process to titanium alloy TC 4, then uses NaOH solution to remove the oil on titanium alloy TC 4 surface, then with steaming
Distilled water is cleaned, and hair dryer dries up, the titanium alloy TC 4 after being processed；
NaOH solution described in step one is mixed by NaOH and distilled water, and the quality of described NaOH and steaming
The volume ratio of distilled water is 8g:1L；
Two, differential arc oxidation: the titanium alloy TC 4 after processing is placed in stainless electrolyte, titanium alloy TC 4 and power supply
Positive pole be connected, as anode, stainless steel electrolytic groove is connected with the negative pole of power supply, as negative electrode；Use the pulse differential of the arc
Oxidation power supply is powered, and is 10A/dm in electric current density2, supply frequency be 50Hz, dutycycle be 45%, the temperature of electrolyte
Degree be the pH value of 30 DEG C and electrolyte be differential arc oxidation reaction 40min under conditions of 7.46, obtain titanium alloy TC 4 surface
Low sunlight absorptivity high emissivity coating；
Electrolyte described in step 2 is made up of main film former and secondary film formers, and solvent is water；Described main film former is fluorine
Potassium zirconium, in electrolyte, the concentration of potassium fluorozirconate is 5g/L；Described secondary film formers is sodium hypophosphite and tertiary sodium phosphate
Mixture, in electrolyte, the concentration of sodium hypophosphite is 3g/L, concentration 0.5g/L of tertiary sodium phosphate in electrolyte.
Titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating prepared by the present embodiment under the conditions of temperature is 500 DEG C,
Insulation 3min, places in water and cools down, and thermal shock is repeated and tests 40 times, and coating does not falls off, and the present embodiment system is described
Standby titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating has excellent adhesion and heat stability.
The thickness of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating prepared by the present embodiment is 106.0 μm, thick
Rugosity is 5.4 μm, and solar absorptance is 0.333, and hemispherical emissivity is 0.96.
SEM photograph such as Fig. 3 institute of titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating prepared by the present embodiment
Show.Fig. 3 is the SEM figure of the titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating of embodiment three preparation；From figure
3 understand surface has the accumulation of a large amount of solid particle to form, and surface porosity porous, crateriform is less obvious, and roughness is relatively
Little.
Use WH-I mao power source instrument low too to the titanium alloy TC 4 surface of titanium alloy TC 4, embodiment one preparation
Sun absorbance high emissivity coating, embodiment two preparation titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating and
The titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating of embodiment three preparation is tested, as shown in Figure 4, and figure
4 is the titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating of titanium alloy TC 4 and embodiment one to three preparation
XRD figure；In figure, a is the XRD figure of titanium alloy TC 4, and b is the low sun in titanium alloy TC 4 surface of embodiment one preparation
The XRD figure of absorbance high emissivity coating, c is that the titanium alloy TC 4 surface low sunlight absorptivity of embodiment two preparation is occurred frequently
Penetrating the XRD figure of rate coating, d is the titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating of embodiment three preparation
XRD figure, " ■ " represents KZr2(PO4)3, " ◆ " represents K3Zr1..5(PO4)3, " " represents Zr0.2Ti0.8P2O7,
Represent K5Zr(PO4)3, "●" represents Ti；The film layer well-crystallized of embodiment one, two and three preparation, titanium as can be seen from Figure 4
The peak that peak is matrix Ti of the XRD figure spectrum of alloy TC4.In embodiment one, the phase composition of film layer is mainly K5Zr(PO4)3
And KZr2(PO4)3, in embodiment two, the phase composition of film layer is mainly Zr0.2Ti0.8P2O7And KZr2(PO4)3, in embodiment three
The phase composition of film layer is mainly K3Zr1..5(PO4)3And KZr2(PO4)3.The film layer that differential arc oxidation generates is mainly many crystalline phases thing
Matter, predominantly phosphate laminate.Containing Zr in the example two implemented0.2Ti0.8P2O7Main cause is probably the film layer phase of preparation
To relatively thin, matrix Ti is easier to be entered the surface of film layer by matrix.
Claims (1)
1. the preparation method of a titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating, it is characterised in that a kind of titanium
The preparation method of alloy TC4 surface low sunlight absorptivity high emissivity coating is specifically realized by the following steps:
One, titanium alloy TC 4 pre-treatment: use 60# dry sand paper, 240# silicon carbide paper and the silicon carbide paper of 400# the most successively
Titanium alloy TC 4 is carried out grinding process, then uses NaOH solution to remove the oil on titanium alloy TC 4 surface, then use distilled water
Cleaning, hair dryer dries up, the titanium alloy TC 4 after being processed；
NaOH solution described in step one is mixed by NaOH and distilled water, and the quality of described NaOH and distillation
The volume ratio of water is 10g:1L；
Two, differential arc oxidation: the titanium alloy TC 4 after processing is placed in stainless electrolyte, titanium alloy TC 4 and power supply
Positive pole is connected, and as anode, stainless steel electrolytic groove is connected with the negative pole of power supply, as negative electrode；Use pulse differential of the arc oxygen
Change power supply to power, be 14A/dm in electric current density2, supply frequency be 50Hz, dutycycle be 45%, the temperature of electrolyte be
The pH value of 30 DEG C and electrolyte is differential arc oxidation reaction 20min under conditions of 1.24, obtains the low sun in titanium alloy TC 4 surface
Absorbance high emissivity coating；
Electrolyte described in step 2 is made up of main film former and secondary film formers, and solvent is water；Described main film former is fluorine
Potassium zirconium, in electrolyte, the concentration of potassium fluorozirconate is 6g/L；Described secondary film formers is the mixing of sodium hypophosphite and phosphoric acid
Thing, concentration 0.5g/L of sodium hypophosphite in electrolyte, in electrolyte, phosphoric acid is 2mL/L；
The thickness of the titanium alloy TC 4 surface low sunlight absorptivity high emissivity coating described in step 2 is that 166 μm, roughness are
11.07 μm, solar absorptance is 0.237, and hemispherical emissivity is 0.99.
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| CN113046809A (en) * | 2019-12-27 | 2021-06-29 | 比亚迪股份有限公司 | Micro-arc oxidation electrolyte, application method thereof and workpiece |
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| CN106702458A (en) * | 2015-08-19 | 2017-05-24 | 宁波瑞隆表面技术有限公司 | Electrolyte for preparing titanium alloy micro-arc oxidation ceramic film layer with high emissivity, and method |
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| CN108239778B (en) * | 2018-01-17 | 2019-08-13 | 西安赛福斯材料防护有限责任公司 | A kind of preparation method of titanium alloy substrate surface high emissivity ceramic coating |
| CN108251880A (en) * | 2018-01-17 | 2018-07-06 | 西安赛福斯材料防护有限责任公司 | A kind of preparation method of TC4 titanium alloy surfaces high IR emissivity coating |
| CN111270288A (en) * | 2020-01-21 | 2020-06-12 | 黑龙江科技大学 | Preparation method of novel titanium dioxide negative electrode material |
| CN115896895A (en) * | 2022-12-06 | 2023-04-04 | 哈尔滨工业大学 | Anti-static high-absorption and high-emission composite thermal control coating prepared on surface of TC4 titanium alloy and preparation method thereof |
| CN117926367A (en) * | 2024-03-25 | 2024-04-26 | 宝鸡西工钛合金制品有限公司 | Preparation method of titanium alloy micro-arc oxidation coating |
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