CN103741090A - Spraying method of surface coatings of sink rolls and stabilizing rolls - Google Patents
Spraying method of surface coatings of sink rolls and stabilizing rolls Download PDFInfo
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- CN103741090A CN103741090A CN201310651677.7A CN201310651677A CN103741090A CN 103741090 A CN103741090 A CN 103741090A CN 201310651677 A CN201310651677 A CN 201310651677A CN 103741090 A CN103741090 A CN 103741090A
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Abstract
The invention discloses a spraying method of surface coatings of sink rolls and stabilizing rolls, belongs to the field of molten state clad material spraying technology, and especially relates to a spraying method of coatings, which possesses high powder feed rate, high-temperature corrosion resistance and wear resistance, on surfaces of sink rolls and stabilizing rolls. The spraying method comprises following steps: pretreatment of workpieces, spraying operation, coating surface cleaning, roughness adjustment, sealing treatment, dynamic balance test, and examination and packaging. The spraying method are characterized in that: powder utilization ratio of spraying processes is high; powder feed rate reaches 45%; bonding states of the coatings with matrices are excellent; bonding strength is 70MPa or more; in spraying processes of WC based coatings, oxidation degradation of WC particles after spraying is less, and binding phase Co is beneficial for bonding of particles in the coatings, so that a problem that coating toughness is low is solved, coating toughness HV1>=1050, and relatively high hardness and excellent toughness of the coatings are ensured; in sealing treatment after coating spraying, apertures in the coatings are filled further, and porosity is less than 0.5%, so that penetration of corrosive mediums via coating apertures and corrosion of the workpieces are avoided.
Description
Technical field
The invention belongs to molten state clad material spraying plating technical field, relate to a kind of spraying method of supersonic flame, relate in particular to a kind of high powder feeding rate resistance to high temperature corrosion on sinking roller and stabilizing roller surface, spraying method of abrasion-resistant coatings of being applied to.
Background technology
Sinking roller in Continuous Hot Dip Galvanizing Line and stabilizing roller, long term operation is in the galvanizing zinc of 500 ℃, be subject to strong corrosion and the infiltration of zinc metallic solution, roll surface easily produces spot corrosion, pit and becomes coarse, roller loss is fairly obvious, need often to change, increase production cost, affect production efficiency.In order to improve surface property and the work-ing life of such roller, at present conventional method is to utilize hot-spraying techniques, at its surface heat spray one deck in conjunction with jail, protection against corrosion, wear-resisting coating.Defect is: thermally sprayed coating unavoidably exists a large amount of holes, causes compactness poor, and the diffusion that exists for zinc of these holes provides diffusion admittance, between coating and matrix bonding force poor, easily come off; During spraying, spray material oxygenolysis rate is high, and powder using efficiency is low.
Summary of the invention
The shortcoming existing in order to overcome prior art, the object of this invention is to provide the spraying method of a kind of sinking roller and stabilizing roller top coat, reduce porosity, improve compactness, strengthen bonding force between coating and matrix, the oxygenolysis of spray material while effectively reducing spraying, improves spray material powder using efficiency.
The spraying method of sinking roller and stabilizing roller top coat, carries out according to the following steps:
1, the pre-treatment of workpiece: take out the satisfactory sinking roller of processed finished products or stabilizing roller, roller length is 1900mm, diameter is φ 760～800mm, the surface, position that need to spray it sprays front surface processing, adopt surface quality Ra1.6～0.8 that turning processing or grinding processing method are clean to obtain, meet spraying coating process requirement, as found, there are the defects such as pit, pit on surface, carries out Welding Repair, and then carries out finish turning or ground finish.Sandblasting, is beneficial to obtain between coating and matrix firmly bonding force, Ra2～3.5 after sandblast.
2, spraying operation: the workpiece that pre-treatment is completed is fixed on special fixture, workpiece idle warm-up to 120～250 ℃ before spraying, selecting spray material is WC-12%Co powder, adopt supersonic spray coating equipment, and then spray, spraying finishes rear workpiece and continues idle running slow cooling, prevents distortion, and spraying parameter span of control is as follows:
1) oxygen flow is 750～950 L/m;
2) carrier gas flux is 2 × (5～7) L/m;
3) fuel flow is 20～25 L/h;
4) combustion chamber pressure is 0.8～1.0MPa;
5) jet length is 300～350mm;
6) roller horizontally rotates, and velocity of rotation is 35～45 rpm;
7) spray gun moves left and right, and translational speed is 3～4.5mm/s;
8) the spraying number of plies is 15～25, every all over after completing intermittence 5min, then carry out next all over spraying;
3, coatingsurface cleaning, roughness adjustment: after Workpiece painting completes, coating is cooling and carry out surface treatment in air, and plumage cloth polishing machine is removed the naked grain of surface adhesion, and adjustment sheet surface roughness reaches Ra3.5～5, simultaneously the thickness of preliminary surveying coating;
4, sealing of hole processing: hole sealing agent is evenly painted on to coatingsurface, is placed in the process furnace processing that is heating and curing, it is 400 ℃～500 ℃ that process furnace solidifies Heating temperature, is incubated 1.5～3 hours;
5, transient equilibrium examination check: by Design Requirement Drawing, roll body dynamic equilibrium state is measured and revised on running balance indicating machine, to meet Design Requirement Drawing;
6, test package: can carry out product final inspection and packing after transient equilibrium test ending.
The present invention further improves, and the spray material in described step 2 is WC-12%Co powder, and (%) this spray material is comprised of following component by weight percentage: Co 11～13, and C 3.5～4.5, Fe≤0.2, all the other are W, powder size (μ m) 15～45.
Compared with prior art, when advantage is spraying, powder using efficiency is high, and powder feeding rate reaches 45%, and the combination of coating and matrix is all right, and bonding strength>=70MPa has higher antistripping while guaranteeing application; During spraying WC base coating, the WC particle oxygenolysis after spraying is few, and Binder Phase Co is also of value to the combination between coating endoparticle simultaneously, supplements the deficiency of coating toughness aspect, coating hardness HV
1>=1050, guarantee that coating has higher hardness and good toughness, for the abrasion resistance of coating provides benefit; Sealing of hole processing after coating spraying, further fills the hole in coating, and porosity, lower than 0.5%, prevents that corrosive medium from entering corrosion workpiece by coating porosity.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is process flow sheet of the present invention;
Fig. 2 is the cross section metallograph that sprays WC-12%Co coating in the present invention;
Fig. 3 is the cross section Vickers impression metallograph that sprays WC-12%Co coating in the present invention;
Fig. 4 is the cross section metallograph after WC-12%Co coating sealing of hole in the present invention;
Fig. 5 is WC-12%Co coating XRD figure spectrum in the present invention;
Fig. 6 is WC-12%Co coating high-temp frictional wear graphic representation in the present invention;
Fig. 7 is SEM and the energy spectrogram after floating coat wearing and tearing of the present invention.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
As shown in Figure 1, the spraying method of sinking roller and stabilizing roller top coat carries out embodiment 1 according to the following steps:
1, the pre-treatment of workpiece: selecting matrix workpiece size is that the surface, position that the sinking roller of φ 782 mm × 1900 mm need to spray it sprays front surface processing, adopt the surface quality Ra1.0 that turning processing or grinding processing method are clean to obtain, meet spraying coating process requirement, as found, there are the defects such as pit, pit on surface, carry out Welding Repair, and then carry out finish turning or ground finish, sandblasting, is beneficial to obtain between coating and matrix firmly bonding force, Ra2.5 after sandblast;
2, spraying operation: the workpiece that pre-treatment is completed is fixed on special fixture, workpiece idle warm-up to 120 ℃ before spraying, selecting spray material is WC-12%Co powder, adopt supersonic spray coating equipment, and then spray, spraying finishes rear workpiece and continues idle running slow cooling, prevents distortion, and spraying parameter is as follows:
1) oxygen flow is 822 L/m;
2) carrier gas flux is 2 × 6L/m;
3) fuel flow is 22.5L/h;
4) combustion chamber pressure is 0.92MPa;
5) jet length is 320mm;
6) roller horizontally rotates, and velocity of rotation is 42rpm;
7) spray gun moves left and right, and translational speed is 3.4mm/s;
8) the spraying number of plies is 16, every all over after completing intermittence 5min, then carry out next all over spraying;
3, coatingsurface cleaning, roughness adjustment: after Workpiece painting completes, coating is cooling and carry out surface treatment in air, and plumage cloth polishing machine is removed the naked grain of surface adhesion, and adjustment sheet surface roughness reaches Ra4.0, simultaneously the thickness of preliminary surveying coating;
4, sealing of hole processing: hole sealing agent is evenly painted on to coatingsurface, is placed in the process furnace processing that is heating and curing, it is 400 ℃ that process furnace solidifies Heating temperature, is incubated 3 hours;
5, transient equilibrium examination check: by Design Requirement Drawing, roll body dynamic equilibrium state is measured and revised on running balance indicating machine, to meet Design Requirement Drawing;
6, test package: can carry out product final inspection and packing after transient equilibrium test ending.Spraying parameter is listed in table 1, and assay is listed in table 2.
Spray material in step 2 is WC-12%Co powder, and (%) this spray material is comprised of following component by weight percentage: Co 11～13, and C 3.5～4.5, Fe≤0.2, all the other are W, powder size (μ m) 15～45.
It is the roller of φ 796 mm × 1900 mm that embodiment 2 selects matrix workpiece size, with embodiment 1 method, processes, and spraying parameter is listed in table 1, and assay is listed in table 2.
It is the roller of φ 765 mm × 1900 mm that embodiment 3 selects matrix workpiece size, with embodiment 1 method, processes, and spraying parameter is listed in table 1, and assay is listed in table 2.
Table 1 embodiment processing parameter
| ? | Unit | Embodiment 1 | |
Embodiment 3 |
| Roller diameter | mm | φ782 | φ796 | φ765 |
| Roll body length | mm | 1900 | 1900 | 1900 |
| Oxygen flow | L/m | 822 | 860 | 895 |
| Carrier gas flux | L/ |
2×6 | 2×6.5 | 2×6.3 |
| Fuel flow | L/h | 22.5 | 23.5 | 23 |
| Combustion chamber pressure | MPa | 0.92 | 0.99 | 0.96 |
| Jet length | mm | 320 | 345 | 340 |
| Roller speed of rotation | rpm | 42 | 40 | 35 |
| Spray gun translational speed | mm/s | 3.4 | 3.0 | 3.0 |
| The spraying number of plies | ? | 16 | 24 | 20 |
| Solidification value and time | ? | 400 ℃, insulation 3 hours | 450 ℃, |
500 ℃, insulation 1.5 hours |
Table 2 assay
| ? | Unit | Embodiment 1 | |
Embodiment 3 |
| Coat-thickness | Mm | 0.08 | 0.12 | 0.1 |
| Powder utilization | % | 44 | 45 | 45 |
| Bonding strength | MPa | 82 | 76 | 74 |
| Porosity | % | 0.39 | 0.47 | 0.41 |
| Surface hardness | HV | 1098 | 1080 | 1140 |
| Surfaceness | Ra | 3.5 | Ra5 | Ra4.5 |
As seen from Figure 2, WC-12%Co is coated with to layer cross section and carries out metallographic morphology observation, coating is combined with matrix well, no significant defect and large hole in coating, and the fine and close thickness of coating is also more even.
As seen from Figure 3, the vickers microhardness test of coating shows, coating has high microhardness: impression regular shape and impression are around without ftractureing and peeling off, and visible coating also has toughness to have good toughness when having high rigidity, and plasticity_resistant deformation ability is better.
As seen from Figure 4, the cross section metallographic structure after coating sealing of hole is observed, after sealing of hole, coating Hole further reduces, coating densification.
As seen from Figure 5, WC-12%Co coating, after X-ray diffraction detects, finds that the main thing in coating is still WC mutually, and decomposition has occurred a small amount of WC of part in spraying, reacts and has formed Co with Co
3w
3c and Co
6w
6c phase, this decomposition is still difficult to avoid at present, but can not have much impact to coating performance.
As seen from Figure 6, frictional force and frictional coefficient curve after the wearing and tearing of WC-12%Co coating high-temp, the friction initial stage is relatively high fluctuating because contact surface has, frictional coefficient first rises, and after two contact surfaces slowly polish, frictional coefficient tends towards stability, within 3600 s test durations, frictional coefficient is more steady all the time, maintain 0.4 left and right, visible coating without considerable change, shows more stable wear resistance in wearing and tearing.
As seen from Figure 7, the SEM of coating abrasion and EDS spectroscopy detection are visible, after coating abrasion, without obvious, ftracture and large-area peeling off, only have a small amount of particle in wearing and tearing, to occur to come off, by shown in energy spectrum analysis, in EDS, principal element is still W and Co simultaneously, and the content of oxygen is little, coating is not almost oxidized in wearing and tearing, shows good resistance to wearing and oxidation capacity under high temperature.
Claims (1)
1. the spraying method of sinking roller and stabilizing roller top coat, is characterized in that carrying out according to the following steps:
(1), the pre-treatment of workpiece: take out the satisfactory sinking roller of processed finished products or stabilizing roller, roller length is 1900mm, diameter is φ 760～800mm, the surface, position that need to spray it sprays front surface processing, adopt surface quality Ra1.6～0.8 that turning processing or grinding processing method are clean to obtain, meet spraying coating process requirement, as found, there are the defects such as pit, pit on surface, carries out Welding Repair, and then carries out finish turning or ground finish.Sandblasting, is beneficial to obtain between coating and matrix firmly bonding force, Ra2～3.5 after sandblast;
(2), spraying operation: the workpiece that pre-treatment is completed is fixed on special fixture, workpiece idle warm-up to 120～250 ℃ before spraying, selecting spray material is WC-12%Co powder, adopt supersonic spray coating equipment, and then spray, spraying finishes rear workpiece and continues idle running slow cooling, prevents distortion, and spraying parameter span of control is as follows:
1) oxygen flow is 750～950 L/m;
2) carrier gas flux is 2 × (5～7) L/m;
3) fuel flow is 20～25 L/h;
4) combustion chamber pressure is 0.8～1.0MPa;
5) jet length is 300～350mm;
6) roller horizontally rotates, and velocity of rotation is 35～45 rpm;
7) spray gun moves left and right, and translational speed is 3～4.5mm/s;
8) the spraying number of plies is 15～25, every all over after completing intermittence 5min, then carry out next all over spraying;
(3), coatingsurface cleaning, roughness adjustment: after Workpiece painting completes, coating is cooling and carry out surface treatment in air, and plumage cloth polishing machine is removed the naked grain of surface adhesion, and adjustment sheet surface roughness reaches Ra3.5～5, simultaneously the thickness of preliminary surveying coating;
(4), sealing of hole processing: hole sealing agent is evenly painted on to coatingsurface, is placed in the process furnace processing that is heating and curing, it is 400 ℃～500 ℃ that process furnace solidifies Heating temperature, is incubated 1.5～3 hours;
(5), transient equilibrium examination check: by Design Requirement Drawing, roll body dynamic equilibrium state is measured and revised on running balance indicating machine, to meet Design Requirement Drawing;
(6), test package: can carry out product final inspection and packing after transient equilibrium test ending.
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|---|---|---|---|
| CN201310651677.7A CN103741090A (en) | 2013-12-06 | 2013-12-06 | Spraying method of surface coatings of sink rolls and stabilizing rolls |
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|---|---|---|---|
| CN201310651677.7A CN103741090A (en) | 2013-12-06 | 2013-12-06 | Spraying method of surface coatings of sink rolls and stabilizing rolls |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104191152A (en) * | 2014-08-06 | 2014-12-10 | 陕西天元智能再制造有限公司 | Method for repairing and remanufacturing outer surface of piston rod of hydraulic cylinder or outer surface of intermediate cylinder |
| CN105951029A (en) * | 2016-06-20 | 2016-09-21 | 新昌县七星街道明盛模具厂 | Production process of protecting coating of explosion spraying high-temperature furnace roller |
| CN104233162B (en) * | 2014-08-06 | 2017-01-25 | 陕西天元智能再制造股份有限公司 | Surface repair method of piston rod |
| CN107779805A (en) * | 2017-10-22 | 2018-03-09 | 陈海银 | Stabilizing roller surface abrasion resistance, corrosion-resistant finishes preparation method |
| CN109161869A (en) * | 2018-09-12 | 2019-01-08 | 云南科威液态金属谷研发有限公司 | A method of corrosion-inhibiting coating is formed in metal part surface |
| CN109609886A (en) * | 2019-01-17 | 2019-04-12 | 北京矿冶科技集团有限公司 | A kind of process improving resisting corrosion of molten zinc coating life |
| CN110293131A (en) * | 2019-06-27 | 2019-10-01 | 西峡龙成特种材料有限公司 | A kind of heat resistant and wear resistant roller and its production technology |
| CN110747426A (en) * | 2019-10-28 | 2020-02-04 | 首钢京唐钢铁联合有限责任公司 | Method for preventing surface of ultrathin hot-dip galvanized sheet from being scratched |
| CN111254422A (en) * | 2019-07-11 | 2020-06-09 | 齐鲁工业大学 | Circular ring type surface composite strengthening method |
| CN112269006A (en) * | 2020-09-30 | 2021-01-26 | 南京钢铁股份有限公司 | Inspection method suitable for hot sprayed aluminum coating on surface of steel plate |
| CN112359310A (en) * | 2020-09-23 | 2021-02-12 | 襄阳振本传动设备有限公司 | Method for coating surface of roll shaft |
| CN114517022A (en) * | 2022-01-27 | 2022-05-20 | 上海联净电子科技有限公司 | Wear-resistant anti-adhesion coating and preparation method and application thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104191152A (en) * | 2014-08-06 | 2014-12-10 | 陕西天元智能再制造有限公司 | Method for repairing and remanufacturing outer surface of piston rod of hydraulic cylinder or outer surface of intermediate cylinder |
| CN104233162B (en) * | 2014-08-06 | 2017-01-25 | 陕西天元智能再制造股份有限公司 | Surface repair method of piston rod |
| CN105951029A (en) * | 2016-06-20 | 2016-09-21 | 新昌县七星街道明盛模具厂 | Production process of protecting coating of explosion spraying high-temperature furnace roller |
| CN107779805A (en) * | 2017-10-22 | 2018-03-09 | 陈海银 | Stabilizing roller surface abrasion resistance, corrosion-resistant finishes preparation method |
| CN109161869A (en) * | 2018-09-12 | 2019-01-08 | 云南科威液态金属谷研发有限公司 | A method of corrosion-inhibiting coating is formed in metal part surface |
| CN109609886A (en) * | 2019-01-17 | 2019-04-12 | 北京矿冶科技集团有限公司 | A kind of process improving resisting corrosion of molten zinc coating life |
| CN110293131A (en) * | 2019-06-27 | 2019-10-01 | 西峡龙成特种材料有限公司 | A kind of heat resistant and wear resistant roller and its production technology |
| CN110293131B (en) * | 2019-06-27 | 2021-02-09 | 西峡龙成特种材料有限公司 | High-temperature-resistant wear-resistant roller and production process thereof |
| CN111254422A (en) * | 2019-07-11 | 2020-06-09 | 齐鲁工业大学 | Circular ring type surface composite strengthening method |
| CN110747426A (en) * | 2019-10-28 | 2020-02-04 | 首钢京唐钢铁联合有限责任公司 | Method for preventing surface of ultrathin hot-dip galvanized sheet from being scratched |
| CN112359310A (en) * | 2020-09-23 | 2021-02-12 | 襄阳振本传动设备有限公司 | Method for coating surface of roll shaft |
| CN112269006A (en) * | 2020-09-30 | 2021-01-26 | 南京钢铁股份有限公司 | Inspection method suitable for hot sprayed aluminum coating on surface of steel plate |
| CN114517022A (en) * | 2022-01-27 | 2022-05-20 | 上海联净电子科技有限公司 | Wear-resistant anti-adhesion coating and preparation method and application thereof |
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