CN103233195A - Powder-core wire for preparing iron-base corrosion-resistant coating by arc spraying and preparation method of coating - Google Patents
Powder-core wire for preparing iron-base corrosion-resistant coating by arc spraying and preparation method of coating Download PDFInfo
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- CN103233195A CN103233195A CN2013101487922A CN201310148792A CN103233195A CN 103233195 A CN103233195 A CN 103233195A CN 2013101487922 A CN2013101487922 A CN 2013101487922A CN 201310148792 A CN201310148792 A CN 201310148792A CN 103233195 A CN103233195 A CN 103233195A
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Abstract
The invention relates to a powder-core wire for preparing an iron-base corrosion-resistant coating by arc spraying and a preparation method of the coating, belonging to the field of hot spraying in material processing engineering. The band used by the powder-core wire sheath is a stainless steel band, and the fill rate of the powder-core wire is 32-33%. The powder-core wire comprises 20-26 wt.% of Cr, 5-13 wt.% of B and 4-13 wt.% of Al. The preparation method of the coating comprises the following steps: pre-grinding a base surface with 180-mesh sand paper, and carrying out grit blasting with 60-mesh brown fused alumina; and obtaining a powder-core wire, and preparing the coating by an arc spraying technique: the voltage is 25-35V, the current is 180-220A, the spraying distance is 200-210mm, and the compressed air pressure is 0.4-0.6 MPa. The coating has the advantages of favorable high-temperature oxidation resistance, favorable corrosion resistance, and high bonding strength with the base, can obviously enhance the operational reliability and service life of the boiler four pipes, and can lower the frequency of maintenance.
Description
Technical field
The invention belongs to the field of thermal spray in the Materials Processing Engineering, is a kind of powder cored filament material that utilizes electric arc spraying process to prepare the iron-based corrosion-resistant finishes, and this invention is mainly used in industrial circles such as resistance to high temperature oxidation and thermal etching.
Background technology
In electric power factory equipment, boiler accounts for critical role, with steam turbine and generator nominal be " the three big main frames " of power plant.And meanwhile, boiler also is the multiple equipment of power plant's accident, and the non-programmed halt major part of fired power generating unit is caused that by it its accident occupation rate is more than 40% of whole unit, accounts for the majority of all non-programmed halt accidents.Wherein, boiler surface " four pipes " fault is to cause the first cause of boiler forced outage.Along with the raising of design and fabrication technology, the high temperature high-pressure resistant material development, big moulded coal electricity is to high-parameters, big capacity, high-level efficiency and high-power station's development, and the security of operation and economy are own through becoming the problem that people pay close attention to.
The thermal etching of coal-fired power station boiler " four pipes " in the high temperature Service Environment is one of its main form of invalidation, because spillage of material and unplanned blowing out that frequent booster brings have caused high maintenance cost and enormous economic loss.Prepare protective coating by hot-spraying techniques at tube wall surface and can significantly improve its serviceability and work-ing life, reduce frequency of maintenance, thereby embody favorable economic benefit, be considered to the most effectively one of guard technology means of boiler " four pipes ".Than technology such as hypersonic flame spraying, it is simple, with low cost and be suitable for advantage such as original position large-area construction that electric arc spraying has a processing unit, therefore accepted extensively and adopt by this field.Yet, in recent years along with the decline of ature of coal condition and the appearance of ultra-supercritical boiler, the Service Environment of boiler " four pipes " is more abominable, also the over-all properties of coated material especially corrosion resisting property is had higher requirement, designing and developing the new coating material becomes the hot issue of this area research to improve its protective capacities.
The present invention utilizes electric arc spraying process to prepare the iron-based corrosion-resistant finishes, to reach serviceability and the work-ing life that increases substantially boiler " four pipes ", reduces the purpose of frequency of maintenance.For economical with materials, reduction use cost, increasing economic efficiency contributes.
It is coating that the present coated material that is used for boiler " four pipes " protection mostly is nickel-base alloy, and because its cost is too high, is subjected to certain limitation in application.By retrieval, the present patent report of not seeing for electrical arc spraying method for preparing FeCrAlB corrosion-resistant finishes.
Summary of the invention
The purpose of this invention is to provide a kind of powder cored filament material and coating production for electrical arc spraying method for preparing iron-based corrosion-resistant finishes.Coating high temperature oxidation resisting and heat and corrosion resistant performance with powder cored filament material preparation of the present invention are strong, and anchoring strength of coating is higher, can improve serviceability and the work-ing life of boiler " four pipes ", reduce frequency of maintenance.
A kind of powder cored filament material for electrical arc spraying method for preparing iron-based corrosion-resistant finishes of the present invention is characterized in that: the used band of silk material crust is Stainless Steel Band; Powder cored filament material filling ratio: 32-33%.Powder cored filament material comprises following each element, and its atomic percent is: Cr:20-26at.%; B:5-13at.%; Al:4-13at.%.
Preferred 430 Stainless Steel Bands of described powder cored filament material crust Stainless Steel Band;
Preferred described powder cored filament material comprises following each element, and its atomic percent is: Cr:20-25at.%; B:5-10at.%; Al:4-10at.%.
Further preferred described powder cored filament material comprises following each element, and its atomic percent is: Cr:23-25at.%; B:7-10at.%; Al:6-10at.%.
Further preferred the elementary composition of powder cored filament material described above is Cr, B, Al, Fe and unavoidable impurities.
Adopt the above-mentioned powder cored filament material of the present invention to prepare a kind of method of iron-based corrosion-resistant finishes, it is characterized in that, comprise the steps:
The described spraying coating process of step 3 is optimized, and spraying parameter is set at: voltage 28-32V; Electric current 190-200A; Spray distance 200mm; Compressed air pressure 0.5-0.6MPa.
The pyro-oxidation resistance that a kind of iron-based corrosion-resistant finishes of the method for the invention preparation has and corrosion resistance nature are that himself component determines.
The Fe element: occupy the higher quality mark in the earth's crust, Fe base alloy can keep higher binding strength with matrix steel again when keeping high cost performance, be suitable for preparing the material surface strengthening coating of using in the abominable Service Environment;
The Cr element: the Cr solid solution in the coating has been played the effect of solution strengthening in Fe; Under high temperature oxidation and thermal etching condition, Cr can with O
2In conjunction with forming fine and close continuously Cr
2O
3Zone of oxidation significantly improves high temperature oxidation resisting and the corrosion resistance nature of coating, and matrix is played a protective role.Cr can also promote the Al element to generate protectiveness Al simultaneously
2O
3Zone of oxidation;
B element: in spraying process; the B element can increase the viscosity of melt granules, reduces that particle stirs and the oxidation that brings, thus the desoxydatoin of playing; the interlevel oxidation thing of coating is reduced in a large number, play the effect that the protection melt granules is not oxidized and improve anchoring strength of coating.The B element has reduced oxidation, has just guaranteed that also Cr element and the Al element in the powder cored filament material is not oxidized in spraying process, and in coating experience high temperature oxidation and thermal etching process, just has enough Cr and Al to generate fine and close continuously Cr
2O
3And Al
2O
3Zone of oxidation, so the B element plays an important role in whole system.
The Al element: in high temperature oxidation and the thermal etching process, the Al element can be preferentially and O
2In conjunction with forming fine and close continuously Al
2O
3Zone of oxidation can prevent a large amount of oxidations of Fe quilt in the coating, also can stop O
2Further endosmosis, high temperature oxidation resisting and the corrosion resistance nature of raising coating play a protective role to matrix.
Though each element in the coating all is conventional element, but the pyro-oxidation resistance of coating and corrosion resistance nature are the synergies by each element to be determined, be not that single-element determines, neither be only just available by the limited number of time test.
The present invention provides a kind of powder cored filament material for electrical arc spraying method for preparing iron-based high temperature oxidation resisting and corrosion-resistant finishes and coating production.After material surface prepared coating, the coating for preparing, bonding strength on average reached 45MPa to this powder cored filament material through electric arc spraying.Coating microhardness on average reaches 354.2HV
0.1, be better than the 190.9HV of matrix steel
0.1The high temperature oxidation resisting corrosive nature is good, and the oxidation kinetics curve is parabola rule, shows effectively to form protective oxide layer fast, resists further oxidation corrosion invasion and attack.Coating can improve serviceability and the work-ing life of boiler " four pipes ".
Description of drawings
Fig. 1 embodiment 9 coating XRD figure samples;
The microhardness of Fig. 2 embodiment 1-11 coating and matrix;
Fig. 3 embodiment 2,4,9,10 and matrix high temperature oxidation empirical curve;
Fig. 4 embodiment 2,4,9,10 and matrix be coated with the brine corrosion empirical curve.
Embodiment
Further illustrate substantive distinguishing features of the present invention and remarkable advantage below by embodiment, the present invention only is confined to the embodiment that states by no means.
Same section is as described below among each embodiment:
Among the embodiment powder cored filament material crust to select specification for use be that 12 * 0.3mm(width is 12mm, thickness is 0.3mm) Stainless Steel Band, the composition of powder cored filament material specifies in an embodiment.Various powder are put into and are mixed powder machine mixing 10 minutes, then mixed powder are added in the stainless steel belt groove of U-shaped.U-lag is healed up, makes medicinal powder parcel wherein, again through wortle gradually tube reducing make its diameter reach 2.0mm;
Matrix select for use the SA213-T2 steel (be of a size of 20 * 15 * 5mm) and adopt No. 45 steel according to the prepared tension specimen rod of the sample dimensions of defined among the GB GB/T8642-2002 after granularity is 180 order sand paper pre-grinding, adopting granularity is 60 orders palm fibre corundum, gaseous tension 0.5-0.6MPa, time length 20s carries out the sandblast roughening treatment to test specimen; 3. spraying parameter specifies in an embodiment, and abrasive wear, solidity to corrosion experiment are no more than 50 μ m with the each coating thickness of coating, spray to 500 μ m several times; In same embodiment, identical with abrasive wear, solidity to corrosion experiment preparation technology of coating parameter, each coating thickness is no more than 50 μ m to bonding strength test, sprays to 250 μ m several times with coating.
According to each element atomic percent of powder cored filament material be: Cr:20at.%; B:5at.%; Al:4at.%; Fe and inevitable impurity: surplus; Filling ratio: 32%, rolling powder cored filament material.The used processing parameter of preparation coating: voltage 25-30V; Electric current 180-200A; Spray distance 200mm; Compressed air pressure 0.4-0.5MPa.
According to each element atomic percent of powder cored filament material be: Cr:20at.%; B:5at.%; Al:4at.%; Fe and inevitable impurity: surplus; Filling ratio: 33%, rolling powder cored filament material.The used processing parameter of preparation coating: voltage 30-35V; Electric current 200-220A; Spray distance 210mm; Compressed air pressure 0.5-0.6MPa.
According to each element atomic percent of powder cored filament material be: Cr:23at.%; B:7at.%; Al:6at.%; Fe and inevitable impurity: surplus; Filling ratio: 32%, rolling powder cored filament material.The used processing parameter of preparation coating: voltage 25-30V; Electric current 180-200A; Spray distance 200mm; Compressed air pressure 0.4-0.5MPa.
According to each element atomic percent of powder cored filament material be: Cr:23at.%; B:7at.%; Al:6at.%; Fe and inevitable impurity: surplus; Filling ratio: 33%, rolling powder cored filament material.The used processing parameter of preparation coating: voltage 30-35V; Electric current 200-220A; Spray distance 210mm; Compressed air pressure 0.5-0.6MPa.
According to each element atomic percent of powder cored filament material be: Cr:25at.%; B:10at.%; Al:10at.%; Fe and inevitable impurity: surplus; Filling ratio: 32%, rolling powder cored filament material.The used processing parameter of preparation coating: voltage 25-30V; Electric current 180-200A; Spray distance 200mm; Compressed air pressure 0.4-0.5MPa.
According to each element atomic percent of powder cored filament material be: Cr:25at.%; B:10at.%; Al:10at.%; Fe and inevitable impurity: surplus; Filling ratio: 33%, rolling powder cored filament material.The used processing parameter of preparation coating: voltage 30-35V; Electric current 200-220A; Spray distance 210mm; Compressed air pressure 0.5-0.6MPa.
According to each element atomic percent of powder cored filament material be: Cr:26at.%; B:13at.%; Al:13at.%; Fe and inevitable impurity: surplus; Filling ratio: 33%, rolling powder cored filament material.The used processing parameter of preparation coating: voltage 25-30V; Electric current 180-200A; Spray distance 200mm; Compressed air pressure 0.4-0.5MPa.
According to each element atomic percent of powder cored filament material be: Cr:26at.%; B:13at.%; Al:13at.%; Fe and inevitable impurity: surplus; Filling ratio: 33%, rolling powder cored filament material.The used processing parameter of preparation coating: voltage 30-35V; Electric current 200-220A; Spray distance 210mm; Compressed air pressure 0.5-0.6MPa.
Embodiment 9
According to each element atomic percent of powder cored filament material be: Cr:24at.%; B:6at.%; Al:8at.%; Fe and inevitable impurity: surplus; Filling ratio: 32%, rolling powder cored filament material.The used processing parameter of preparation coating: voltage 28-32V; Electric current 190-200A; Spray distance 200mm; Compressed air pressure 0.5-0.6MPa.
According to each element atomic percent of powder cored filament material be: Cr:28at.%; B:7at.%; Al:9at.%; Fe and inevitable impurity: surplus; Filling ratio: 33%, rolling powder cored filament material.The used processing parameter of preparation coating: voltage 28-32V; Electric current 190-200A; Spray distance 200mm; Compressed air pressure 0.5-0.6MPa.
Embodiment 11
According to each constituent atoms per-cent of powder cored filament material be: Cr:22at.%; B:8at.%; Al:11at.%; Fe and inevitable impurity: surplus; Filling ratio: 33%, rolling powder cored filament material.The used processing parameter of preparation coating: voltage 28-32V; Electric current 190-200A; Spray distance 200mm; Compressed air pressure 0.5-0.6MPa.
The prepared coating performance of each embodiment detects as described below:
1. the prepared coating of embodiment is carried out analysis of porosity, adopt Image Pro Plus6.0 image analysis software, utilize image method to analyze coating porosity, to estimate the coating density.Respectively the cross section of each embodiment manufactured coating is got five metallographs and calculate, and get its mean value, see Table 1.
2. the prepared coating of embodiment is carried out the bonding strength test, carry out according to the GB/T8642-2002 standard is described, caking agent is selected SHANGHAI RESEARCH INSTITUTE OF SYNTHETIC RESINS made E-7 type thermal structure glue for use, the colloid proportioning provides according to specification sheets, and behind 100 ℃ of curing 3h, carry out the bonding strength test, see Table 1.
3. the prepared coating of embodiment is carried out x-ray diffraction experiment, adopt D8ADVANCE type X-ray diffractometer to carry out.Test condition is: Cu target K α radiation, and voltage 40kV, electric current 50mA, diffraction angle (2 θ), useful range is 20～80 °, 0.02 ° of scanning step, temperature is 298K.
4. the prepared coating of embodiment is carried out micro-hardness testing, adopt the digital microhardness tester of HXD-1000TM, load 100g, loading time 15s, each embodiment coating is measured the microhardness value of 10 points and is averaged.
5. the prepared coating of embodiment is carried out the high temperature oxidation experiment, only choose coating as sample, specification: 20 * 15 * 5mm; All samples are carried out high temperature oxidation experiment in 650 ℃ of air furnaces, take out behind every 10h, weigh after placing the air cooling, after the 200h round-robin test, obtain its unit surface weightening finish curve.
6. the prepared coating of embodiment is carried out the thermal etching experiment, only choose coating as sample, specification: 20 * 15 * 5mm; After all samples are carried out 250 ℃ of preheating 20min, utilize mol ratio to be the Na of 7:3
2SO
4And K
2SO
4Mixing salt the solution that disposes soak, take out the back and under 120 ℃ of temperature, be used for the oven dry residual moisture through 2h, be coated with salt amount: 3-5mg/cm
2, in 650 ℃ of air furnaces, carry out thermal etching experiment, take out behind every 10h, weigh after placing the air cooling, after the 200h round-robin test, obtain its unit surface weightening finish curve.
From Fig. 3 and 4 as can be seen; in preceding 5 hours scope of high temperature oxidation and thermal etching; the unit surface weightening finish obviously; the unit surface gain in weight tends towards stability afterwards; substantially no longer increase, the high temperature oxidation resisting corrosive nature is good, and the oxidation kinetics curve is parabola rule; show and effectively to form protective oxide layer fast, resist further oxidation corrosion invasion and attack.
Table 1 embodiment 1-11 coating porosity and bonding strength
Claims (7)
1. powder cored filament material that is used for electrical arc spraying method for preparing iron-based corrosion-resistant finishes, it is characterized in that: the used band of silk material crust is Stainless Steel Band, the powder cored filament material filling ratio is 32-33%, and powder cored filament material comprises following each element, and its atomic percent is: Cr:20-26at.%; B:5-13at.%; Al:4-13at.%.
2. according to a kind of powder cored filament material for electrical arc spraying method for preparing iron-based corrosion-resistant finishes of claim 1, it is characterized in that: described powder cored filament material comprises following each element, and its atomic percent is: Cr:20-25at.%; B:5-10at.%; Al:4-10at.%.
3. according to a kind of powder cored filament material for electrical arc spraying method for preparing iron-based corrosion-resistant finishes of claim 1, it is characterized in that: described powder cored filament material comprises following each element, and its atomic percent is: Cr:23-25at.%; B:7-10at.%; Al:6-10at.%.
4. according to a kind of powder cored filament material for electrical arc spraying method for preparing iron-based corrosion-resistant finishes of claim 1, the elementary composition of described powder cored filament material is Cr, B, Al, Fe and unavoidable impurities.
5. according to a kind of powder cored filament material for electrical arc spraying method for preparing iron-based corrosion-resistant finishes of claim 1, preferred 430 Stainless Steel Bands of powder cored filament material crust Stainless Steel Band.
6. the powder cored filament material of employing claim 1 prepares a kind of method of iron-based corrosion-resistant finishes, it is characterized in that, comprises the steps:
Step 1, matrix surface is carried out pre-treatment: matrix surface is after granularity 180 order sand paper pre-grinding, and utilizing granularity is that 60 orders palm fibre corundum carries out sandblasting, air pressure 0.5-0.6MPa, time 20s;
Step 2, powder cored filament material is rolling, finally obtain the powder cored filament material that diameter is 2.0mm, allow over/under tolerance in 0.03mm;
Step 3 adopts electric arc spraying process to prepare coating, and spraying parameter is: voltage 25-35V; Electric current 180-220A; Spray distance 200-210mm; Compressed air pressure 0.4-0.6MPa, the preparation coating.
7. according to the method for claim 6, it is characterized in that step 3 spraying parameter is set at: voltage 28-32V; Electric current 190-200A; Spray distance 200mm; Compressed air pressure 0.5-0.6MPa.
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Cited By (3)
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|---|---|---|---|---|
| WO2015034985A1 (en) * | 2013-09-05 | 2015-03-12 | Mahle Industries, Inc. | Wire alloy for plasma wire arc coating |
| CN105803377A (en) * | 2016-03-23 | 2016-07-27 | 水利部杭州机械设计研究所 | Anti-high-temperature and abrasion-resistant electric arc spraying cored wire containing cerium oxide and rhenium, coating and preparation method of coating |
| RU2613118C2 (en) * | 2015-05-20 | 2017-03-15 | Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" | Flux cored wire for coatings resistant to abrasive wear and high-temperature corrosion |
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| CN105803377A (en) * | 2016-03-23 | 2016-07-27 | 水利部杭州机械设计研究所 | Anti-high-temperature and abrasion-resistant electric arc spraying cored wire containing cerium oxide and rhenium, coating and preparation method of coating |
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Application publication date: 20130807 |