CN108728845A - A kind of preparation method of stainless steel surface zinc doping aluminized coating - Google Patents
A kind of preparation method of stainless steel surface zinc doping aluminized coating Download PDFInfo
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- CN108728845A CN108728845A CN201810672916.XA CN201810672916A CN108728845A CN 108728845 A CN108728845 A CN 108728845A CN 201810672916 A CN201810672916 A CN 201810672916A CN 108728845 A CN108728845 A CN 108728845A
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- stainless steel
- zinc doping
- aluminum slurry
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
- C23C24/106—Coating with metal alloys or metal elements only
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- Application Of Or Painting With Fluid Materials (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention discloses a kind of preparation method of stainless steel surface zinc doping aluminized coating, this method includes：One, dispersant is added in solvent after mixing and adds aluminium powder, zinc chloride and silica gel, obtain zinc doping aluminum slurry after mixing again；Two, stainless steel surface is subjected to derusting by sandblasting and cleaning successively；Three, by zinc doping aluminum slurry be coated to it is cleaned after stainless steel surface on, then dry, on stainless steel surface formed zinc doping aluminum slurry coat；Four, stainless steel that surface is formed to zinc doping aluminum slurry coat carries out pre-add heat treatment, then leads to direct current electrical heating and carries out Alloying Treatment, and zinc doping aluminized coating is formed in stainless steel surface.The stainless steel that surface is formed zinc doping aluminum slurry coat by the present invention first preheats again logical direct current electrical heating progress Alloying Treatment, uniform and high consistency zinc doping aluminized coating is formed in stainless steel surface, the corrosion resistance of stainless steel is improved, manufacturing cost is low and preparation efficiency is high.
Description
Technical field
The invention belongs to corrosion-resistant surface coat preparing technology fields, and in particular to a kind of stainless steel surface zinc doping aluminium painting
The preparation method of layer.
Background technology
China's supercritical unit installed capacity and supercritical unit production technology have currently reached the top level in the world, China
Plan the ultra supercritical power generation technology in China for being 650 DEG C or more in future development main steam temperature.Higher main steam temperature is to super
Supercritical boiler stainless steel has stronger corrosivity, the especially speed and exfoliation rates of high-temperature surface oxide growth
Apparent aggravation, this proposes tightened up requirement to boiler of power plant stainless steel, especially superheater and reheater stainless steel.Therefore,
Improving the oxidation resistance of boiler stainless steel just becomes the ultra supercritical power generation technology in China of 650 DEG C of main steam temperature of development or more
Key.
The research institutions such as GE, B&W, FW, EPRI of US and European focus primarily upon more high anti-oxidation grade material in the past
Exploitation, but with the continuous improvement of overcritical power station temperature, the requirement to material is higher and higher, and development difficulty is increasingly
Greatly.Therefore, it is based on current material, the problem of oxidation of material is reduced by optimal control just becomes a class for being worth further investigation
Topic.Europe implementation " Coatings for Supercritical Steam Cycles " (SUPERCOAT) project,
Extend the service life of pipeline by the preparation of aluminized coating to improve the high temperature resistance steam oxidation corrosive nature of material.
But when the alumetizing process for preparing aluminized coating of mainstream is applied to large-scale pipeline, main steam pipe inner wall aluminising at present still
Excessively high and the problems such as aluminized coating consistency is inadequate there are aluminising temperature, it is tired that there is also aluminisings when being applied especially to complex component
Difficult problem, leads to that the preparation efficiency of aluminized coating is low and manufacturing cost is excessively high.
Invention content
Technical problem to be solved by the present invention lies in view of the above shortcomings of the prior art, provide a kind of stainless steel surface
The preparation method of zinc doping aluminized coating.This method first preheats the stainless steel of surface formation zinc doping aluminum slurry coat leads to again
Direct current electrical heating carries out Alloying Treatment, forms uniform and high consistency zinc doping aluminized coating in stainless steel surface, improves
The corrosion resistance of stainless steel, and solve the problems, such as that existing large-scale and complicated stainless steel component alumetizing process difficulty is big, it prepares
At low cost and preparation efficiency is high.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of stainless steel surface zinc doping aluminized coating
Preparation method, which is characterized in that this approach includes the following steps：
Step 1: preparing zinc doping aluminum slurry：Dispersant is added in solvent and is uniformly mixed, is then added -300
Mesh aluminium powder, zinc chloride and silica gel are simultaneously uniformly mixed, and obtain zinc doping aluminum slurry；
Step 2: stainless steel watch surface treatment：Stainless steel surface is subjected to derusting by sandblasting, then carries out cleaning treatment；
Step 3: coating zinc doping aluminum slurry：The zinc doping aluminum slurry obtained in step 1 is coated in step 2 and is passed through
It on stainless steel surface after cleaning treatment, then dries at room temperature, forms zinc doping aluminum slurry coat；The zinc doping aluminium
The thickness of slurry coat is 500 μm~800 μm；
Step 4: Alloying Treatment：The surface obtained in step 3 is formed to the stainless steel of zinc doping aluminum slurry coat
Pre-add heat treatment is carried out, then leads to direct current electrical heating and carries out Alloying Treatment, zinc doping aluminized coating is formed in stainless steel surface；Institute
The temperature for stating pre-add heat treatment is 500 DEG C~800 DEG C, and the logical electrically heated current density of direct current is 8A/cm2~15A/cm2,
The time of heating is 50s~300s.
A kind of preparation method of above-mentioned stainless steel surface zinc doping aluminized coating, which is characterized in that zinc described in step 1
Doping aluminum slurry is by following mass percent at being grouped as：- 300 mesh aluminium powders 46.4%~49%, solvent 46.2%~
48.9%, zinc chloride 2%~3.6%, dispersant 0.6%~3.2%, silica gel 0.5%~0.8%.
The preparation method of above-mentioned a kind of stainless steel surface zinc doping aluminized coating, which is characterized in that the dispersant is poly-
Vinyl butyral or hydroxyethyl cellulose, the solvent are absolute ethyl alcohol.
Compared with the prior art, the present invention has the following advantages：
1, the present invention is first preheated by the way that surface to be formed to the stainless steel of zinc doping aluminum slurry coat, improves zinc doping aluminium
Metallic atom activity in coat, then logical direct current electrical heating carry out Alloying Treatment, make the metal in zinc doping aluminium coating
Atom uniformly quickly penetrates into stainless steel surface layer, reduces infiltration resistance, reduces aluminising temperature, to be formed in stainless steel surface
Uniform and high consistency zinc doping aluminized coating improves the corrosion resistance of stainless steel, and is not necessarily to special high-temperature process
Equipment integrally heats stainless steel, is suitable for large-scale and complicated stainless steel component, reduces preparation energy consumption, reduce preparation
Cost improves preparation efficiency.
2, the present invention uses zinc doping aluminum slurry coating processes, can zinc doping aluminum slurry be directly coated uniformly on complexity not
The surface of rust steel member, forms the zinc doping aluminized coating of even compact, and it is difficult to solve existing complicated stainless steel component alumetizing process
Big problem is spent, and realizes construction site operation, complicated stainless steel component is reduced and is handled in different processing producers
Transportation cost.
3, aluminium powder and zinc chloride are promoted in a solvent using dispersant and silica gel in zinc doping aluminum slurry component of the invention
Suspended dispersed, avoid the particle agglomeration of aluminium powder and zinc chloride, improve the suspension uniformity of zinc doping aluminum slurry, thus
The zinc doping aluminized coating formed on stainless steel surface is more uniformly distributed, and antiseptic property is more reliable, and -300 mesh aluminium powder conduct of use
Component is conducive to improve dispersion of the aluminium powder in zinc doping aluminum slurry, and the suspension for further improving zinc doping aluminum slurry is uniform
Property；In addition, the Zn-ef ficiency in zinc doping aluminized coating has electro-chemical activity, effective cathodic protection can be provided to stainless steel,
The isolating and protecting effect with blocking corrosive medium, further improves the thermal stability and chemical stabilization of zinc doping aluminized coating
Property.
4, the corrosion resistance of zinc doping aluminized coating prepared by the present invention is good, is especially coupled in supercritical water hydrogen production from coal gasification
Power generation etc., which is faced in hydrogen environment, has the characteristics that stability is high.
5, preparation method of the invention is simple, and operation is easy, and cost is relatively low, and use scope is wide, is suitable for large-scale production
Stainless steel surface zinc doping aluminized coating.
Technical scheme of the present invention is described in further detail below by embodiment.
Specific implementation mode
Embodiment 1
The preparation method of the present embodiment includes the following steps：
Step 1: preparing zinc doping aluminum slurry：2.3g polyvinyl butyrals are added in 46.2g absolute ethyl alcohols and are stirred
It is uniformly mixed, -300 mesh aluminium powders, 2.0g zinc chloride and the 0.5g silica gel of 49g is then added and is uniformly mixed, obtain zinc and mix
Miscellaneous aluminum slurry；
Step 2: stainless steel watch surface treatment：Stainless steel surface is subjected to derusting by sandblasting, then carries out cleaning treatment；It is described
Stainless steel is heat resisting steel G115 (9Cr-2.8W-3CoCuVNbBN), and the size of stainless steel is 100mm × 20mm × 20mm；
Step 3: coating zinc doping aluminum slurry：The zinc doping aluminum slurry obtained in step 1 is coated in step 2 and is passed through
It on stainless steel surface after cleaning treatment, then dries at room temperature, forms zinc doping aluminum slurry coat；The zinc doping aluminium
The thickness of slurry coat is 500 μm~600 μm；
Step 4: Alloying Treatment：The surface obtained in step 3 is formed to the stainless steel of zinc doping aluminum slurry coat
Pre-add heat treatment is carried out, then leads to direct current electrical heating and carries out Alloying Treatment, zinc doping aluminized coating is formed in stainless steel surface；Institute
The temperature for stating pre-add heat treatment is 500 DEG C, and the logical electrically heated current density of direct current is 8A/cm2, the time of heating is
300s。
Embodiment 2
The preparation method of the present embodiment includes the following steps：
Step 1: preparing zinc doping aluminum slurry：1.5g polyvinyl butyrals are added in 46.7g absolute ethyl alcohols and are stirred
It is uniformly mixed, -300 mesh aluminium powders, 3.0g zinc chloride and the 0.6g silica gel of 48.2g is then added and is uniformly mixed, obtain zinc
Adulterate aluminum slurry；
Step 2: stainless steel watch surface treatment：Stainless steel surface is subjected to derusting by sandblasting, then carries out cleaning treatment；It is described
Stainless steel is heat resisting steel G115 (9Cr-2.8W-3CoCuVNbBN), and the size of stainless steel is 100mm × 20mm × 20mm；
Step 3: coating zinc doping aluminum slurry：The zinc doping aluminum slurry obtained in step 1 is coated in step 2 and is passed through
It on stainless steel surface after cleaning treatment, then dries at room temperature, forms zinc doping aluminum slurry coat；The zinc doping aluminium
The thickness of slurry coat is 500 μm~700 μm；
Step 4: Alloying Treatment：The surface obtained in step 3 is formed to the stainless steel of zinc doping aluminum slurry coat
Pre-add heat treatment is carried out, then leads to direct current electrical heating and carries out Alloying Treatment, zinc doping aluminized coating is formed in stainless steel surface；Institute
The temperature for stating pre-add heat treatment is 500 DEG C, and the logical electrically heated current density of direct current is 8A/cm2, the time of heating is
300s。
Embodiment 3
The preparation method of the present embodiment includes the following steps：
Step 1: preparing zinc doping aluminum slurry：0.6g hydroxyethyl celluloses are added to stir in 48.9g absolute ethyl alcohols and are mixed
It closes -300 mesh aluminium powders, 3.6g zinc chloride and the 0.5g silica gel that 46.4g is uniformly then added and is uniformly mixed, obtain zinc and mix
Miscellaneous aluminum slurry；
Step 2: stainless steel watch surface treatment：Stainless steel surface is subjected to derusting by sandblasting, then carries out cleaning treatment；It is described
Stainless steel is heat resisting steel G115 (9Cr-2.8W-3CoCuVNbBN), and the size of stainless steel is 100mm × 20mm × 20mm；
Step 3: coating zinc doping aluminum slurry：The zinc doping aluminum slurry obtained in step 1 is coated in step 2 and is passed through
It on stainless steel surface after cleaning treatment, then dries at room temperature, forms zinc doping aluminum slurry coat；The zinc doping aluminium
The thickness of slurry coat is 700 μm~800 μm；
Step 4: Alloying Treatment：The surface obtained in step 3 is formed to the stainless steel of zinc doping aluminum slurry coat
Pre-add heat treatment is carried out, then leads to direct current electrical heating and carries out Alloying Treatment, zinc doping aluminized coating is formed in stainless steel surface；Institute
The temperature for stating pre-add heat treatment is 800 DEG C, and the logical electrically heated current density of direct current is 15A/cm2, the time of heating is
50s。
Embodiment 4
The preparation method of the present embodiment includes the following steps：
Step 1: preparing zinc doping aluminum slurry：3.2g hydroxyethyl celluloses are added to stir in 47.5g absolute ethyl alcohols and are mixed
It closes -300 mesh aluminium powders, 2.0g zinc chloride and the 0.8g silica gel that 46.5g is uniformly then added and is uniformly mixed, obtain zinc and mix
Miscellaneous aluminum slurry；
Step 2: stainless steel watch surface treatment：Stainless steel surface is subjected to derusting by sandblasting, then carries out cleaning treatment；It is described
Stainless steel is heat resisting steel G115 (9Cr-2.8W-3CoCuVNbBN), and the size of stainless steel is 100mm × 20mm × 20mm；
Step 3: coating zinc doping aluminum slurry：The zinc doping aluminum slurry obtained in step 1 is coated in step 2 and is passed through
It on stainless steel surface after cleaning treatment, then dries at room temperature, forms zinc doping aluminum slurry coat；The zinc doping aluminium
The thickness of slurry coat is 700 μm~800 μm；
Step 4: Alloying Treatment：The surface obtained in step 3 is formed to the stainless steel of zinc doping aluminum slurry coat
Pre-add heat treatment is carried out, then leads to direct current electrical heating and carries out Alloying Treatment, zinc doping aluminized coating is formed in stainless steel surface；Institute
The temperature for stating pre-add heat treatment is 650 DEG C, and the logical electrically heated current density of direct current is 12A/cm2, the time of heating is
120s。
Embodiment 5
The preparation method of the present embodiment includes the following steps：
Step 1: preparing zinc doping aluminum slurry：1.9g polyvinyl butyrals are added in 46.9g absolute ethyl alcohols and are stirred
It is uniformly mixed, -300 mesh aluminium powders, 2.5g zinc chloride and the 0.7g silica gel of 48g is then added and is uniformly mixed, obtain zinc and mix
Miscellaneous aluminum slurry；
Step 2: stainless steel watch surface treatment：Stainless steel surface is subjected to derusting by sandblasting, then carries out cleaning treatment；It is described
Stainless steel is heat resisting steel G115 (9Cr-2.8W-3CoCuVNbBN), and the size of stainless steel is 100mm × 20mm × 20mm；
Step 3: coating zinc doping aluminum slurry：The zinc doping aluminum slurry obtained in step 1 is coated in step 2 and is passed through
It on stainless steel surface after cleaning treatment, then dries at room temperature, forms zinc doping aluminum slurry coat；The zinc doping aluminium
The thickness of slurry coat is 500 μm~800 μm；
Step 4: Alloying Treatment：The surface obtained in step 3 is formed to the stainless steel of zinc doping aluminum slurry coat
Pre-add heat treatment is carried out, then leads to direct current electrical heating and carries out Alloying Treatment, zinc doping aluminized coating is formed in stainless steel surface；Institute
The temperature for stating pre-add heat treatment is 700 DEG C, and the logical electrically heated current density of direct current is 10A/cm2, the time of heating is
200s。
The above is only presently preferred embodiments of the present invention, is not imposed any restrictions to the present invention.It is every according to invention skill
Art essence still falls within technical solution of the present invention to any simple modification, change and equivalence change made by above example
Protection domain in.
Claims (3)
1. a kind of preparation method of stainless steel surface zinc doping aluminized coating, which is characterized in that this approach includes the following steps：
Step 1: preparing zinc doping aluminum slurry：Dispersant is added in solvent and is uniformly mixed, -300 mesh aluminium are then added
Powder, zinc chloride and silica gel are simultaneously uniformly mixed, and obtain zinc doping aluminum slurry；
Step 2: stainless steel watch surface treatment：Stainless steel surface is subjected to derusting by sandblasting, then carries out cleaning treatment；
Step 3: coating zinc doping aluminum slurry：The zinc doping aluminum slurry obtained in step 1 is coated to cleaned in step 2
It on treated stainless steel surface, then dries at room temperature, forms zinc doping aluminum slurry coat；The zinc doping aluminum slurry
The thickness of coat is 500 μm~800 μm；
Step 4: Alloying Treatment：The stainless steel that the surface obtained in step 3 is formed to zinc doping aluminum slurry coat carries out
Pre-add is heat-treated, and is then led to direct current electrical heating and is carried out Alloying Treatment, and zinc doping aluminized coating is formed in stainless steel surface；It is described pre-
The temperature of heat treatment is 500 DEG C~800 DEG C, and the logical electrically heated current density of direct current is 8A/cm2~15A/cm2, heating
Time be 50s~300s.
2. a kind of preparation method of stainless steel surface zinc doping aluminized coating according to claim 1, which is characterized in that step
Zinc doping aluminum slurry described in one is by following mass percent at being grouped as：- 300 mesh aluminium powders 46.4%~49%, solvent
46.2%~48.9%, zinc chloride 2%~3.6%, dispersant 0.6%~3.2%, silica gel 0.5%~0.8%.
3. a kind of preparation method of stainless steel surface zinc doping aluminized coating according to claim 2, which is characterized in that described
Dispersant is polyvinyl butyral or hydroxyethyl cellulose, and the solvent is absolute ethyl alcohol.
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| CN109477223A (en) * | 2016-06-20 | 2019-03-15 | 迪布洛克涂料有限公司 | The material of coating method and coating |
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2018
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| CN1597617A (en) * | 2004-09-29 | 2005-03-23 | 哈尔滨工业大学 | Sintered metal powder coating material and method of preparing metal ceramic anti corrosive coating |
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