CN102676971B - Preparation method for composite coating of outer surface of nodular cast iron pipe - Google Patents
Preparation method for composite coating of outer surface of nodular cast iron pipe Download PDFInfo
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- CN102676971B CN102676971B CN201210147784.1A CN201210147784A CN102676971B CN 102676971 B CN102676971 B CN 102676971B CN 201210147784 A CN201210147784 A CN 201210147784A CN 102676971 B CN102676971 B CN 102676971B
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Abstract
The invention discloses a preparation method for a composite coating of an outer surface of a nodular cast iron pipe, belonging to the technical field of corrosion inhibition of a metal material. The preparation method comprises the following steps of: (1) pretreating the outer surface of the nodular cast iron pipe; (2) the spray coating of a ceramic coating: uniformly mixing a ceramic coating raw material, and spraying the ceramic coating raw material on the outer surface of the nodular cast iron pipe by adopting flame spraying equipment, wherein the weight of the ceramic coating on the outer surface of the nodular cast iron pipe is 80-300g/m<2>, the diameter of the powder of the mixing ceramic coating raw material is 5-60 microns; the mixing ceramic coating raw material comprises Al2O3, TiO2 and Cr2O3; and (3) coating a hole sealing finishing coat. As the ceramic coating prepared by the invention has low porosity, the ceramic coating has better corrosion resistance performance; the ceramic coating has stronger binding capacity with a substrate and good wear resistance performance, can be suitable for severe environments and is low in manufacturing cost; and the hole sealing finishing coat can further increase the corrosion resistance performance of the ceramic coating.
Description
Technical field
The invention belongs to metallic material corrosion and suppress technical field.
Background technology
What the hot spray coating of metal current pipeline was most widely used is spelter coating, although spelter coating has good dynamic electric chemoproection performance, spelter coating has the following shortcoming:
One, the porosity of Zn coating is higher, weakens its antiseptic property;
They are two years old, in conventional atmospheric environment, Zn coating corrosion product is mainly by the zinc oxide that is insoluble in water, alkali formula zinc hydroxide and subcarbonate composition, this type of corrosion product has certain self-enclosed ability and intercepts the intrusion of the corrosive mediums such as moisture, but in the higher environment of chloride ion content, due to the intrusion of chlorion, Zn coatingsurface is insoluble in the corrosion products such as the carbonate of water and is loosened rapidly, the villaumite compound that is easy to dissolve replaces, corrosion product also can cause coating foaming simultaneously, lower the sticking power of coating, cause coating that spot corrosion easily occurs, non-uniform corrosion and shorten its anticorrosion life-span.
Its three, Zn coating and metallic matrix bonding force are poor, easily occur damaged peeling phenomenon on production line track after rolling;
Its four, Zn coating hardness is lower, its hardness is about HRC 20 left and right, in the time being subject to the shock of various external force, impact and friction, there are wearing and tearing in distortion slippage easily, greatly reduces its protective capacities.
Although Zn coating has above-mentioned shortcoming, in general applied environment, spelter coating meets service requirements and forms as first-selected coating, and in the environment of some inclement conditions, spelter coating just can not meet its service requirements.Such as the pipeline of installing in Desertification environment, in transporting, deposit and installing and using process, for a long time through the impact of wind-engaging sand, require pipeline external coating (EC) to there is good wear resistance and corrosion resistance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of preparation method of spheroidal graphite cast iron tube outer surface compound coating, and ceramic coating porosity prepared by the present invention is low, and therefore antiseptic property is better; Ceramic coating and matrix binding ability are stronger, and wear resistance can be applicable to well severe environment, and cost of manufacture is low; Sealing of hole finish(ing) coat can further improve the Corrosion Protection of ceramic coating.
The technical solution used in the present invention is: a kind of preparation method of spheroidal graphite cast iron tube outer surface compound coating, comprises the following steps:
(1) spheroidal graphite cast iron tube outer surface pre-treatment;
(2) spraying ceramic coat: ceramic coating raw material is mixed, adopt flame plating equipment that ceramic coating raw material is sprayed to spheroidal graphite cast iron tube outer surface, the ceramic coating weight on spheroidal graphite cast iron tube outer surface is 80～300g/m
2, ceramic coating raw material powder diameter is 5～60 microns; Ceramic coating raw material is made up of following material by mass percentage: Al
2o
330～70%, TiO
21～20%, surplus is Cr
2o
3;
(3) apply sealing of hole finish(ing) coat
Apply organic or inorganic paint at ceramic coating outside surface, thickness of coating layer is 70～150 microns.
Ceramic coating weight on preferred spheroidal graphite cast iron tube outer surface is 180g/m
2.
Flame plating comprises general flame plating, HVOF (High Velocity Oxygen Fuel) and hypersonic flame spraying.
Adopt flame spray powder coating equipment, oxide ceramic powder is heated to remelting, be sprayed at pipe surface, form wear resistant protective ceramic coating, in the weave construction of its coating, have Al
2o
3alloy phase, Cr
2o
3alloy phase and a small amount of TiO
2alloy phase, Al
2o
3alloy phase and Cr
2o
3alloy phase alternately exists, the collaborative Al that brought into play
2o
3resistance to adhesive wear performance and the Cr of alloy phase
2o
3the Abrasive Resistance of Stubble-cleaning of alloy phase, the TiO in coating
2phase structure of alloy densification, can stop up the hole in ceramic coating, reduces the porosity of ceramic coating, has strengthened the self-enclosed effect of coating, and coating is improved greatly in the corrosion resisting property in corrosion later stage.
The beneficial effect that adopts technique scheme to produce is:
Ceramic coating porosity prepared by the present invention is low, and therefore antiseptic property is better; Ceramic coating and matrix binding ability are stronger, and wear resistance can be applicable to well severe environment, and cost of manufacture is low; Sealing of hole finish(ing) coat can further improve the Corrosion Protection of ceramic coating.
1. Al
2o
3and Cr
2o
3alloy powder wide material sources, price is lower, and producer is easy to prepare the powder that meets composition and granularity requirements as requested, for spraying abrasion-proof ceramic coating, so abrasion-proof ceramic coat economic and practical is good and easy to implement.
2. ceramic coating wear and corrosion behavior is good, suitable being applied in the erosion corrosion environment such as Desertification, and the abrasion-proof ceramic coat hardness spraying is approximately 3 times of pure Zn coating, its wear resistance and corrosion resistance is obviously better than pure Zn coating and ZnAl alloy coat, long service life; Ceramic coating porosity of the present invention is lower than pure Zn coating.
3, spheroidal graphite cast iron tube outer surface compound coating of the present invention also comprises sealing of hole finish(ing) coat, can prevent the impact of ceramic coating internal void on ceramic coating antiseptic property.
Embodiment
Embodiment 1
A preparation method for spheroidal graphite cast iron tube outer surface compound coating, comprises the following steps:
(1) spheroidal graphite cast iron tube outer surface pre-treatment: to cast-iron pipe and pipe fitting surface treatment, remove the impurity such as descaling, oil, water, dust before thermospray.
(2) spraying ceramic coat: ceramic coating raw material is mixed, adopt supersonic velocity flame plating equipment that ceramic coating raw material is sprayed to spheroidal graphite cast iron tube outer surface, supersonic velocity flame plating equipment comprises flame spraying gun, powder feeder, air compressor machine, oxygen and acetylene gas pipe path control system etc.;
Ceramic coating weight on spheroidal graphite cast iron tube outer surface is 180g/m
2, ceramic coating raw material powder diameter is 5 microns; Ceramic coating raw material is made up of following material by mass percentage: Al
2o
330%, TiO
220%, Cr
2o
350%.
Hardness value >=the HRC 67 of ceramic coating.
(3) apply sealing of hole finish(ing) coat
Apply epoxy resin at ceramic coating outside surface, the thickness of epoxy resin layer is 70 microns.
Embodiment 2
A preparation method for spheroidal graphite cast iron tube outer surface compound coating, comprises the following steps:
(1) spheroidal graphite cast iron tube outer surface pre-treatment: to cast-iron pipe and pipe fitting surface treatment, remove the impurity such as descaling, oil, water, dust before thermospray.
(2) spraying ceramic coat: ceramic coating raw material is mixed, adopt flame plating equipment that ceramic coating raw material is sprayed to spheroidal graphite cast iron tube outer surface, flame plating equipment comprises flame spraying gun, powder feeder, air compressor machine, oxygen and acetylene gas pipe path control system etc.;
Ceramic coating weight on spheroidal graphite cast iron tube outer surface is 80g/m
2, ceramic coating raw material powder diameter is 60 microns; Ceramic coating raw material is made up of following material by mass percentage: Al
2o
370%, TiO
210%, Cr
2o
320%.
Hardness value >=the HRC 65 of ceramic coating.
(3) apply sealing of hole finish(ing) coat
Apply resol at ceramic coating outside surface, the thickness of resol layer is 150 microns.
Embodiment 3
A preparation method for spheroidal graphite cast iron tube outer surface compound coating, comprises the following steps:
(1) spheroidal graphite cast iron tube outer surface pre-treatment: to cast-iron pipe and pipe fitting surface treatment, remove the impurity such as descaling, oil, water, dust before thermospray.
(2) spraying ceramic coat: ceramic coating raw material is mixed, adopt HVOF (High Velocity Oxygen Fuel) equipment that ceramic coating raw material is sprayed to spheroidal graphite cast iron tube outer surface, HVOF (High Velocity Oxygen Fuel) equipment comprises flame spraying gun, powder feeder, air compressor machine, oxygen and acetylene gas pipe path control system etc.;
Ceramic coating weight on spheroidal graphite cast iron tube outer surface is 240g/m
2, ceramic coating raw material powder diameter is 30 microns; Ceramic coating raw material is made up of following material by mass percentage: Al
2o
347%, TiO
23%, Cr
2o
350%.
Hardness value >=the HRC 69 of ceramic coating.
(3) apply sealing of hole finish(ing) coat
Apply epoxy resin at ceramic coating outside surface, the thickness of epoxy resin layer is 120 microns.
Embodiment 4
A preparation method for spheroidal graphite cast iron tube outer surface compound coating, comprises the following steps:
(1) spheroidal graphite cast iron tube outer surface pre-treatment: to cast-iron pipe and pipe fitting surface treatment, remove the impurity such as descaling, oil, water, dust before thermospray.
(2) spraying ceramic coat: ceramic coating raw material is mixed, adopt flame plating equipment that ceramic coating raw material is sprayed to spheroidal graphite cast iron tube outer surface, flame plating equipment comprises flame spraying gun, powder feeder, air compressor machine, oxygen and acetylene gas pipe path control system etc.;
Ceramic coating weight on spheroidal graphite cast iron tube outer surface is 300g/m
2, ceramic coating raw material powder diameter is 15 microns; Ceramic coating raw material is made up of following material by mass percentage: Al
2o
345%, TiO
21%, Cr
2o
354%.
Hardness value >=the HRC 68 of ceramic coating.
(3) apply sealing of hole finish(ing) coat
Apply aluminum phosphate at ceramic coating outside surface, the thickness of phosphoric acid aluminium lamination is 70 microns.
Claims (2)
1. a preparation method for spheroidal graphite cast iron tube outer surface compound coating, is characterized in that: comprise the following steps:
(1) spheroidal graphite cast iron tube outer surface pre-treatment;
(2) spraying ceramic coat: ceramic coating raw material is mixed, adopt flame plating equipment that ceramic coating raw material is sprayed to spheroidal graphite cast iron tube outer surface, the ceramic coating weight on spheroidal graphite cast iron tube outer surface is 80～300g/m
2, described ceramic coating raw material powder diameter is 5～60 microns; Described ceramic coating raw material is made up of following material by mass percentage: Al
2o
345～70%, TiO
220%, surplus is Cr
2o
3;
(3) apply sealing of hole finish(ing) coat
Apply organic or inorganic paint at ceramic coating outside surface, thickness of coating layer is 70～150 microns.
2. the preparation method of a kind of spheroidal graphite cast iron tube outer surface compound coating as claimed in claim 1, is characterized in that: the ceramic coating weight on spheroidal graphite cast iron tube outer surface is 180g/m
2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210147784.1A CN102676971B (en) | 2012-05-14 | 2012-05-14 | Preparation method for composite coating of outer surface of nodular cast iron pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210147784.1A CN102676971B (en) | 2012-05-14 | 2012-05-14 | Preparation method for composite coating of outer surface of nodular cast iron pipe |
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| Publication Number | Publication Date |
|---|---|
| CN102676971A CN102676971A (en) | 2012-09-19 |
| CN102676971B true CN102676971B (en) | 2014-11-26 |
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ID=46809511
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|---|---|---|---|
| CN201210147784.1A Active CN102676971B (en) | 2012-05-14 | 2012-05-14 | Preparation method for composite coating of outer surface of nodular cast iron pipe |
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|---|---|---|---|---|
| CN103373033B (en) * | 2012-04-17 | 2016-03-30 | 新兴铸管股份有限公司 | Zn-Al-Mg-RE pseudo alloy coating and preparation method thereof |
| CN103938145B (en) * | 2013-01-20 | 2016-02-17 | 江苏兆龙电气有限公司 | The preparation method of the corrosion of resistance to copper cermet material |
| CN103146907A (en) * | 2013-03-25 | 2013-06-12 | 南京梅山冶金发展有限公司 | Cold-rolled high-temperature furnace roller covered with oxide ceramic coating |
| CN103465549A (en) * | 2013-07-26 | 2013-12-25 | 天津大学 | Thermal barrier coating including anti-thermal corrosion transition bottom layer and preparation method thereof |
| CN106439260B (en) * | 2016-12-07 | 2019-04-23 | 大连圣洁热处理科技发展有限公司 | A kind of ductile iron pipe and preparation method thereof with lamination layer structure |
| CN106498329A (en) * | 2016-12-07 | 2017-03-15 | 大连圣洁热处理科技发展有限公司 | A kind of composite bed ductile iron pipe and preparation method thereof |
| CN106764121B (en) * | 2016-12-08 | 2019-03-26 | 大连圣洁热处理科技发展有限公司 | A kind of water transferring line process of surface treatment |
| CN106425332B (en) * | 2016-12-09 | 2018-08-17 | 大连圣洁真空技术开发有限公司开发区分公司 | A kind of tube surfaces treatment process |
| CN106521479A (en) * | 2016-12-13 | 2017-03-22 | 大连圣洁热处理科技发展有限公司 | Manufacturing method of titanium plate comprising composite layer |
| CN106702368A (en) * | 2016-12-13 | 2017-05-24 | 大连圣洁热处理科技发展有限公司 | Composite-layer metal plate |
| CN107051839A (en) * | 2017-02-14 | 2017-08-18 | 广东欧珀移动通信有限公司 | A kind of preparation method of metal fittings, metal fittings and mobile terminal |
| CN108796357B (en) * | 2018-07-12 | 2020-01-24 | 佛山市高明康得球铁有限公司 | Preparation method of composite material containing nodular cast iron |
| CN114101007B (en) * | 2021-11-30 | 2023-02-17 | 国铭铸管股份有限公司 | Method for reducing lining cracks of nodular cast iron pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4141743A (en) * | 1977-10-31 | 1979-02-27 | Dresser Industries, Inc. | Thermal spray powdered composite |
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