CN111101093A - Efficient aluminizing processing method - Google Patents
Efficient aluminizing processing method Download PDFInfo
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- CN111101093A CN111101093A CN201811274105.0A CN201811274105A CN111101093A CN 111101093 A CN111101093 A CN 111101093A CN 201811274105 A CN201811274105 A CN 201811274105A CN 111101093 A CN111101093 A CN 111101093A
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- pipe part
- steel pipe
- aluminizing
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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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/18—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions
- C23C10/20—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions only one element being diffused
- C23C10/22—Metal melt containing the element to be diffused
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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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/02—Pretreatment of the material to be coated
-
- 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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/60—After-treatment
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to the field of hot aluminizing, in particular to a high-efficiency aluminizing processing method. The technical scheme adopted by the invention is as follows: the method comprises the following steps: carrying out surface degreasing on the steel pipe part or the iron pipe part in an acid washing mode; a step of cleaning the surface of the part in the previous step in a water washing mode; putting the washed steel pipe part or iron pipe part into a permeation-assisting liquid for permeation assistance; drying the steel pipe part or the iron pipe part subjected to the permeation assistance, wherein a layer of additive containing NaNO2 is coated on the surface of the steel pipe part or the iron pipe part; and putting the dried parts into an aluminizing furnace for aluminizing treatment. The invention has the advantages that: the production efficiency of the whole can be effectively improved, the mode that the traditional mode adopts independent parts to permeate is avoided, the cost in the production process is effectively saved, the production efficiency of the whole is improved, and the performance of the whole product is improved.
Description
Technical Field
The invention relates to the field of hot aluminizing, in particular to a high-efficiency aluminizing processing method.
Background
The stainless steel products are expensive to treat, and in some use rings with high requirements for corrosion prevention, the overall cost is increased by adding corrosion prevention treatment to the stainless steel products due to the need of products with strong corrosion prevention and high structural strength. Aluminizing is a chemical heat treatment process in which one or more metallic aluminum atoms penetrate into the surface layer of a metal workpiece. The metal workpiece is put in the penetrating agent containing the penetrating metal element, heated to a certain temperature, and kept for a proper time, active atoms of the penetrating metal element generated by thermal decomposition of the penetrating agent are adsorbed to the surface of the workpiece and diffused into the surface layer of the workpiece, so that the chemical composition, the structure and the performance of the surface layer of the workpiece are changed. According to different use requirements, the aluminizing can be carried out on carbon steel, low alloy steel and high chrome nickel alloy steel matrixes. After aluminizing, a layer of iron-aluminum alloy and a pure aluminum layer with special properties are formed on the surface of the materials, so that the high-temperature oxidation resistance and the corrosion resistance of the materials are improved.
The existing aluminizing process or method generally has smaller equipment for aluminizing treatment when in use, limits the infiltration treatment of pipe fitting metal products, cannot perform stable infiltration when the processing diameter is too large or too small, can cause poor infiltration effect and is easy to generate the shedding of a surface protective layer. And the condition of leaking the infiltration can't be avoided appearing in traditional aluminizing mode, leads to the aluminized layer degree of consistency not high, and holistic performance is stable inadequately.
Disclosure of Invention
The invention aims to provide an efficient aluminizing processing method, which can effectively improve the overall production efficiency by adopting four large-scale production processing furnaces for overall processing, avoids the traditional mode of adopting a single part for infiltration, effectively saves the cost in the production process, improves the overall production efficiency, ensures the safety of the whole in the production process and greatly improves the overall processing efficiency by respectively carrying out production procedures in different corresponding furnaces, can ensure the stability during early processing and improve the processing effect in the early processing process by carrying out the processing in a first processing furnace before aluminizing, and provides guarantee for the infiltration stability during later aluminizing, and the processing method can reduce the temperature of aluminized parts to 200 ℃ -260 ℃ in a furnace cooling mode after diffusion processing, thereby can make the molecule that diffuses in the part can more stabilize more firm and part between zonulae occludens together to improved the performance of whole product, made its life-span in the use longer, the range of application is wider, and can make the production efficiency in the whole production process higher, reduced the average cost of production back part, the condition of stifled hole can not appear carrying out the aluminizing in-process, make the stability of whole aluminizing process better.
The technical scheme of the invention is as follows:
a high-efficiency aluminizing processing method is characterized in that: the method comprises the following steps: 1) carrying out surface oil removal treatment on the steel pipe part or the iron pipe part in an acid washing mode; 2) further cleaning the surface of the steel pipe part or the iron pipe part in the previous step in a water washing mode; 3) putting the washed steel pipe part or iron pipe part into the infiltration assisting liquid for infiltration assisting; 4) drying the steel pipe part or the iron pipe part subjected to the permeation assistance, wherein when the steel pipe part or the iron pipe part is dried, a layer of additive containing 5.5 percent of NaNO2 is coated on the surface of the steel pipe part or the iron pipe part; 5) inputting the aluminum raw material into an aluminizing processing furnace after high-temperature melting, and then putting the dried steel pipe part or iron pipe part into the aluminizing furnace at the temperature of 720-750 ℃ for aluminizing treatment; 6) putting the aluminized steel pipe part or iron pipe part into a diffusion furnace for deep diffusion; 7) and furnace cooling in a diffusion furnace for 2-3 hours until the temperature in the furnace is reduced to 200-260 ℃: 8) naturally cooling to below 40 ℃ after the furnace is taken out; wherein: the steps 1 to 4 are all carried out in a high-temperature furnace, and the temperature in the high-temperature furnace is less than 100 ℃; the temperature in the diffusion furnace is 750-780 ℃.
Furthermore, the whole method adopts four production furnaces arranged below the ground for production and processing.
Further, the diameter of the steel pipe part or the iron pipe is zero
And 8000mm in length.
Further, the permeation assisting temperature of the step 4 is 100 ℃, and the operation temperature of the steps 1 to 3 is 20-50 ℃.
Further, the diameter of the steel pipe part or the iron pipe is zero
Further, the aluminum concentration in the carburized layer formed by the steel pipe part or the iron pipe part is more than 15% (wt).
The invention has the beneficial effects that:
the invention can effectively improve the overall production efficiency, avoids the traditional mode of adopting a single part for infiltration, effectively saves the cost in the production process, improves the overall production efficiency, can ensure the safety of the whole in the production process, can greatly improve the overall processing efficiency, can ensure the stability in the early-stage treatment process, can also improve the treatment effect in the early-stage treatment process, provides guarantee for the infiltration stability in the later-stage aluminizing process, can ensure that molecules diffused into the parts can be more stably and firmly connected with the parts together, thereby improving the performance of the whole product, prolonging the service life of the whole product in the use process, widening the application range and reducing the average cost of the parts after production.
Detailed Description
A high-efficient aluminizing processing method, it carries on the integral processing treatment through adopting four large-scale production processing furnaces, can improve the integral production efficiency effectively, has avoided the traditional way to adopt the mode that the single part permeates, has saved the cost in the production run effectively, has raised the integral production efficiency, the production process is carried on in different corresponding stoves separately, not only can guarantee the security in the production run of the whole, can greatly raise the integral processing efficiency at the same time, carry on in the first processing stove while carrying on the treatment before aluminizing, not only can guarantee the stability while processing earlier, can also improve the treatment effect in the treatment process earlier, offer the guarantee for the infiltration stability while aluminizing later stage, this processing method, after carrying on diffusion treatment, make the temperature of the aluminizing part reduce to 200 duC-260 through the way of furnace cooling, therefore, molecules diffused into the parts can be more stably and more firmly connected with the parts, the performance of the whole product is improved, the service life of the whole product in the using process is longer, the application range is wider, the production efficiency in the whole production process is higher, and the average cost of the parts after production is reduced. The invention comprises the following steps: 1) carrying out surface oil removal treatment on the steel pipe part or the iron pipe part in an acid washing mode; 2) further cleaning the surface of the steel pipe part or the iron pipe part in the previous step in a water washing mode; 3) putting the washed steel pipe part or iron pipe part into the infiltration assisting liquid for infiltration assisting; 4) drying the steel pipe part or the iron pipe part subjected to the permeation assistance, wherein when the steel pipe part or the iron pipe part is dried, a layer of additive containing 5.5 percent of NaNO2 is coated on the surface of the steel pipe part or the iron pipe part; 5) inputting the aluminum raw material into an aluminizing processing furnace after high-temperature melting, and then putting the dried steel pipe part or iron pipe part into aluminizing aluminum with the temperature of 720-750 ℃ for aluminizing treatment; 6) putting the aluminized steel pipe part or iron pipe part into a diffusion furnace for deep diffusion; 7) and furnace cooling in a diffusion furnace for 2-3 hours until the temperature in the furnace is reduced to 200-260 ℃: 8) naturally cooling to below 40 ℃ after the furnace is taken out; wherein: the steps 1 to 4 are all carried out in a high-temperature furnace, and the temperature in the high-temperature furnace is less than 100 ℃; the temperature in the diffusion furnace is 750-780 ℃. The steel pipe parts or iron pipe parts produced by the production method have more stable penetration effect, the integral penetration depth is deeper, the formed protective layer has better stability, and the novel aluminized steel product has excellent high-temperature oxidation resistance, so that the service temperature of a common carbon steel product is increased from 500 ℃ to 850 ℃, and the service temperature of stainless steel is increased from 1000 ℃ to 1250 ℃. The high temperature oxidation test result at 800 ℃ shows that the high temperature oxidation resistance of the novel aluminized steel is more than 50 times that of the common steel. High-temperature oxidation tests show that under the high-temperature environment condition of 800 ℃, the oxidation rate of Q235 steel is 8.17g/m2 & h, the oxidation rate of aluminized Q235 steel material is 0.16g/m2 & h, and the high-temperature oxidation resistance of the aluminized material is improved by nearly 51 times. The surface of the novel aluminized steel material is a pure aluminum layer and a crystalline iron-aluminum alloy layer, and the wear resistance is improved by more than 1 time compared with that of common steel. The surface of the novel aluminized steel material is provided with two closed protective layers of a pure aluminum layer and an iron-aluminum alloy layer, and the Al2O3 film can be compact, complete and stable in medium environments of high temperature, air and the like, has a strong anode retardation effect on electrochemical corrosion, passivates the surface to a certain extent to ensure that the hydrogen evolution potential is high, and also has a certain cathode retardation effect, so that the coating has strong uniform corrosion resistance. In addition, because the rare earth elements are added into the aluminum liquid, the infiltration layer is uniform, the impurity content is low, and the surface active area of the infiltration layer is reduced. The residual impurities are uniformly distributed in the aluminized layer under the action of the rare earth elements, so that the corrosion activation potential of the coating is reduced. These can improve the uniform corrosion resistance of the aluminized layer to a great extent. The rare earth elements have high chemical activity and are adsorbed in dislocation, subboundary, grain boundary and the like in the aluminum layer. Tissue defects that may preferentially corrode. The average potential of the whole corrosion surface is changed to be positive, and external corrosion atoms are prevented from diffusing into the matrix.
The new material has the following corrosion resistance:
①, the ability of resisting atmosphere, soil, seawater, NH3, S, organic acid and the like is greatly improved;
② aluminized steel has better corrosion resistance in high-temperature air, CO2, SO2, high-temperature S and other media;
③ is superior to stainless steel in terms of medium corrosion resistance to vanadium (V2O5) and selenium (SeO2) and stress cracking resistance.
The whole range is wider when in use, and generally speaking, where the corrosion resistance of aluminum is required to be utilized and the application is limited by the mechanical property, aluminized steel can be considered. For example, aluminum materials, while improving the corrosion resistance of furnace tubes in a hydrodesulfurization unit, do not allow for the use of pure aluminum furnace tubes due to strength and temperature parameters. In this case, aluminized steel is considered. Since the temperature, even high enough to vaporize the aluminum, does not affect the properties of the aluminum-iron alloy layer. The glass fiber reinforced plastic composite material can be used for connecting plates of railway steel rails, wire bows, sound-proof facilities of railway trunk lines, highway protective fences, road marking supports, marking plates and the like in the aspects of oil refining, chemical engineering, metallurgy, machinery, shipbuilding, electric power, gas and transportation, and can be used for lining of surface kiln side walls, stirring impellers, glass roasting furnace doors, annealing furnace doors, enameling hangers, supports and the like in the silicate industry; in other aspects: the hot water boiler can be used for hot water boilers and pipelines, hot spring pipelines, coast anticorrosion fences, dairy product containers, brewing appliances, food baking oven devices and the like, can ensure the stability in different using environments, can also reduce the cost in the application process, and improves the overall safety of use.
Preferably, the whole method adopts four production furnaces arranged below the ground for production and processing, the occupied space on the ground is smaller when the production and processing are carried out, the production and processing are more convenient, the safety in the production and processing process can be more reliable, the operation personnel can also be more convenient when the operation is carried out, the safety in the operation is also improved, the problem that the traditional mode adopts single piece production can be avoided, the batch parts can be more stably and uniformly aluminized in a batch processing mode, and the whole production efficiency is higher.
Preferably, the diameter of the steel pipe part or the iron pipe is zero
And length is 8000mm, when the part in this interval is produced and is processed, can make the efficiency of infiltration of aluminizing higher, holistic infiltration homogeneity is better to can reduce the production and processing cost when needing longer aluminizing part, make holistic production process more high-efficient.
Preferably, the infiltration assisting temperature in the step 4 is 100 ℃, the operation temperature from the step 1 to the step 3 is 20-50 ℃, the efficiency of drying can be higher, the drying time can be effectively saved, the dryness of the surface of the part can be better, the uniformity of the part can be more stable when the part is subjected to the later stage of aluminizing and diffusion, and the performance after the whole aluminizing can be further guaranteed.
Preferably, the diameter of the steel pipe part or the iron pipe is zero
The production efficiency of the parts in the interval is highest, and the overall production cost can be lower.
Preferably, the aluminum concentration in the cementation layer formed by the steel pipe part or the iron pipe part is more than 15 percent (wt), so that the cementation layer has better corrosion resistance when in use, and is more than three times of that of 18-8 grade stainless steel under the same working condition.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications or substitutions can be made without departing from the principle of the present invention, and these modifications or substitutions should also be considered as the protection scope of the present invention.
Claims (6)
1. A high-efficiency aluminizing processing method is characterized in that: the method comprises the following steps: 1) carrying out surface oil removal treatment on the steel pipe part or the iron pipe part in an acid washing mode; 2) further cleaning the surface of the steel pipe part or the iron pipe part in the previous step in a water washing mode; 3) putting the washed steel pipe part or iron pipe part into the infiltration assisting liquid for infiltration assisting; 4) drying the steel pipe part or the iron pipe part subjected to the permeation assistance, wherein when the steel pipe part or the iron pipe part is dried, a layer of additive containing 5.5 percent of NaNO2 is coated on the surface of the steel pipe part or the iron pipe part; 5) inputting the aluminum raw material into an aluminizing processing furnace after high-temperature melting, and then putting the dried steel pipe part or iron pipe part into the aluminizing furnace at the temperature of 720-750 ℃ for aluminizing treatment; 6) putting the aluminized steel pipe part or iron pipe part into a diffusion furnace for deep diffusion; 7) and furnace cooling in a diffusion furnace for 2-3 hours until the temperature in the furnace is reduced to 200-260 ℃: 8) naturally cooling to below 40 ℃ after the furnace is taken out; wherein: the steps 1 to 4 are all carried out in a high-temperature furnace, and the temperature in the high-temperature furnace is less than 100 ℃; the temperature in the diffusion furnace is 750-780 ℃.
2. The high-efficiency aluminizing processing method according to claim 1, characterized in that: the whole method adopts four production furnaces arranged below the ground for production and processing.
3. The method according to claim 1 or 2The high-efficiency aluminizing processing method is characterized by comprising the following steps: the diameter of the steel pipe part or the iron pipe is zero
And 8000mm in length.
4. The high-efficiency aluminizing processing method according to claim 3, characterized in that: the permeation assisting temperature of the step 4 is 100 ℃, and the operation temperature of the steps 1 to 3 is 20-50 ℃.
5. The high-efficiency aluminizing processing method according to claim 3, characterized in that: the diameter of the steel pipe part or the iron pipe is zero
6. The high-efficiency aluminizing processing method according to claim 3, characterized in that: the aluminum concentration in the cementation layer formed by the steel pipe part or the iron pipe part is more than 15 percent (wt).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811274105.0A CN111101093A (en) | 2018-10-29 | 2018-10-29 | Efficient aluminizing processing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811274105.0A CN111101093A (en) | 2018-10-29 | 2018-10-29 | Efficient aluminizing processing method |
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| CN111101093A true CN111101093A (en) | 2020-05-05 |
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| CN201811274105.0A Pending CN111101093A (en) | 2018-10-29 | 2018-10-29 | Efficient aluminizing processing method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055956A (en) * | 1990-04-21 | 1991-11-06 | 衡水钢管厂 | The aluminizing coating process of oxygen lance |
| CN1673406A (en) * | 2005-03-11 | 2005-09-28 | 广州豪然润峰实业有限公司 | Fast thermal alumetizing technology for steel pieces |
| CN1687480A (en) * | 2005-05-10 | 2005-10-26 | 秦德贤 | Technique for manufacturing whole hot dip aluminizing heat exchanger (tube tank) |
| CN101392360A (en) * | 2008-06-30 | 2009-03-25 | 黄虹 | Hot-dipped aluminum technique method of heavy duty automobile exhaust tube |
| CN101665898A (en) * | 2009-10-14 | 2010-03-10 | 北京中路大成科技发展有限公司 | Method for preparing ZnAlNi multi-component alloy anticorrosive coating on workpiece surface |
| CN103320745A (en) * | 2013-07-08 | 2013-09-25 | 湖北交投四优钢科技有限公司 | Aluminized steel and preparation method thereof |
-
2018
- 2018-10-29 CN CN201811274105.0A patent/CN111101093A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055956A (en) * | 1990-04-21 | 1991-11-06 | 衡水钢管厂 | The aluminizing coating process of oxygen lance |
| CN1673406A (en) * | 2005-03-11 | 2005-09-28 | 广州豪然润峰实业有限公司 | Fast thermal alumetizing technology for steel pieces |
| CN1687480A (en) * | 2005-05-10 | 2005-10-26 | 秦德贤 | Technique for manufacturing whole hot dip aluminizing heat exchanger (tube tank) |
| CN101392360A (en) * | 2008-06-30 | 2009-03-25 | 黄虹 | Hot-dipped aluminum technique method of heavy duty automobile exhaust tube |
| CN101665898A (en) * | 2009-10-14 | 2010-03-10 | 北京中路大成科技发展有限公司 | Method for preparing ZnAlNi multi-component alloy anticorrosive coating on workpiece surface |
| CN103320745A (en) * | 2013-07-08 | 2013-09-25 | 湖北交投四优钢科技有限公司 | Aluminized steel and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 刘建国等: "《可再生能源导论》", 28 February 2017, 中国轻工业出版社 * |
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