CN102168244B - Steel sleeper and zinc impregnation processing method thereof - Google Patents
Steel sleeper and zinc impregnation processing method thereof Download PDFInfo
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Abstract
The invention discloses a steel sleeper and a zinc impregnation processing method thereof. The zinc impregnation processing method of the steel sleeper comprises steel sleeper surface pretreatment, steel sleeper surface zinc impregnation processing and steel sleeper surface aftertreatment. The steel sleeper surface zinc impregnation processing comprises the following steps of: (1) mixing zinc powder, composite powder mixed by nano cerium oxide and nano lanthanum oxide, an activating agent and a filler, then carrying out fine grinding to prepare a zinc impregnation agent; (2) carrying out zinc impregnation treatment; and (3) cooling the steel sleeper. The processing method disclosed by the invention is simple and scientific, overcomes the problems that a protecting layer of a steel sleeper treated by the prior art is easy for cracking and even falling in the long-term service process, and the like and realizes the advantages of uniform steel sleeper surface impregnation layer, good scratching resistance and high impact resistance and corrosion resistance.
Description
Technical field
The present invention relates to the steel sleeper technology, relate in particular to a kind of zinc impregnation processing method and steel sleeper of steel sleeper.
Background technology
Steel sleeper is one of important component in the railroad track; The sleeper material that extensively adopts on the railway at present has three kinds: wooden sleeper, concrete sleeper and steel sleeper; Cheap wooden sleeper and the concrete sleeper of the general employing of the early stage railway of building of China; Steel sleeper particularly obtains in the high-speed railway widely applying at newly built railway in recent years.The safety of steel sleeper significantly is superior to wooden sleeper and concrete sleeper, yet corrosion be on active service to be prone to takes place in physical environment steel sleeper for a long time, and then influences the work-ing life of railroad track, therefore, need carry out rotproofing to the steel sleeper surface in the practical applications.
For the rotproofing on steel sleeper surface, the method that adopts usually is zinc-rich coating or pot galvanize technology at present.Zinc-rich coating technology relatively typical application is organic zinc-rich coating and inorganic zinc-rich coating, utilizes the metallic zinc in the coating can effectively delay corrosion to the galvanic protection effect of steel sleeper; The pot galvanize technology also is based on same principle and delays corrosion.Yet the actual Service Environment of steel sleeper is very harsh; Such as: through regular meeting suffer train through the time high-frequency vibration, the train of running at high speed that cause drive sand to the steel sleeper surface constantly impact, open-air harsh climate environment and artificial destruction etc.; Zinc-rich coating and pot galvanize coating are very easily damaged in above-mentioned severe environment even are come off, thereby lose provide protection.
The patent No. is: 200510013167.2; Denomination of invention is: a kind of patent of nanometer composite powder zinc impregnation processing method; Introduced a kind of method that adopts the nano composite powder processing metal members; Adopted zinc powder, nano rare earth cerium oxide, acvator and weighting agent to mix the zincizing agent that obtains, it is above to double through the workpiece layer surface hardness ratio soft steel hardness (is 115HV like No. 20 steel hardness) of this method processing, than medium carbon steel (No. 45 steel hardness are 172HV) hardness higher more than 50%.This working method has significantly improved the mechanical property of steel piece surface; But because of the steel sleeper of handling through this kind mode; Its surperficial thermodiffusion spelter coating Zn/Fe alloy layer has certain fragility; This coating is under the sand that the train of running at high speed drives impacts, and the risk that has cracking even come off is not suitable for handling the steel sleeper that is in for a long time under the outwork environment.
Therefore, invent a kind of prolonged application under abominable physical environment, the steel sleeper that still has excellent anti scratch resistant, shock resistance and erosion resistance is very important for ensureing safe railway operation.
Summary of the invention
The present invention provides a kind of zinc impregnation processing method of steel sleeper, in order to solve defective of the prior art, realizes that working method is simple, can process the good steel sleeper of antiseptic property.
A kind of zinc impregnation processing method of steel sleeper comprises: steel sleeper surface pre-treatment, steel sleeper surface zincizing processing and steel sleeper surface aftertreatment, the zincizing processing of said steel sleeper surface comprises the steps:
(1) preparation zincizing agent: preparation zincizing agent: zinc powder, rare earth composite powder end, acvator and weighting agent are carried out the refinement milled processed after by a certain amount of mixing; Composite powder after the grinding is a micro/nano level; Zinc content is greater than 98% in the said zinc powder; Granularity is 200～300 orders, directly adopts 200-300 purpose zinc powder to compare and adopts the bigger zinc powder of granularity, can slow down zinc powder in the process of lapping oxidation, improve the zinc powder particle size uniformity, improve the homogeneity of various powder; Said rare earth composite powder end comprises nano-cerium oxide and nano lanthanum oxide, and consumption is 2%～10% of a zinc powder weight; The consumption of said acvator is 0.1～0.3% of a zincizing agent weight; Said rare earth composite powder end particle size diameter scope is 65nm～455nm; The volume sum of said weighting agent, compound zinc powder and steel sleeper equals 90%～95% of zincizing tank volume;
(2) zincizing is handled: steel sleeper member and the zincizing agent for preparing are filled in the zincizing jar; To load good zincizing jar then and be placed on heat temperature raising in the zincizing furnace; Zincizing jar upset heating makes the steel sleeper thermally equivalent in the zincizing jar, and the heat temperature raising time was controlled in 2～2.5 hours; When temperature reaches 300～420 ℃, kept homo(io)thermism 50～120 minutes; Form the zinc-iron intermetallic compound on the steel sleeper top layer, this stratification compound and matrix steel sleeper are to combine with metallurgical mode;
(3) steel sleeper cooling: after zincizing was finished dealing with, the zincizing jar was cooled to below 100 ℃ the zincizing jar taken out from zincizing furnace with zincizing furnace, continued to be cooled to temperature and was lower than 50 ℃, and steel sleeper is separated with zincizing agent.
Further, the preferred steps of said steel sleeper surface zincizing processing is following:
(1) preparation zincizing agent: zinc powder, rare earth composite powder end, acvator and weighting agent are carried out the refinement milled processed after by a certain amount of mixing, and zinc content is greater than 98% in the said zinc powder, and granularity is 200～300 orders; Said rare earth composite powder end comprises nano-cerium oxide and nano lanthanum oxide, and consumption is 5%～8% of a zinc powder weight; The consumption of said acvator is 0.16～0.2% of a zincizing agent weight; Said rare earth composite powder end particle size diameter scope is 65nm～455nm; The volume sum of said weighting agent, compound zinc powder and steel sleeper equals 92%～95% of zincizing tank volume;
(2) zincizing is handled: steel sleeper member and the zincizing agent for preparing are filled in the zincizing jar; To load good zincizing jar then and be placed on heat temperature raising in the zincizing furnace; The zincizing jar makes the steel sleeper thermally equivalent in the zincizing jar with the heating of overturning of 7～15 rev/mins rotating speed, and the heat temperature raising time was controlled in 2～2.5 hours; When temperature reaches 300～420 ℃, kept homo(io)thermism 60～90 minutes; Form the zinc-iron intermetallic compound on the steel sleeper top layer, this stratification compound and matrix steel sleeper are to combine with metallurgical mode;
(3) steel sleeper cooling: after zincizing was finished dealing with, the zincizing jar was cooled to below 100 ℃ the zincizing jar taken out from zincizing furnace with zincizing furnace, continued to be cooled to temperature and was lower than 50 ℃, and steel sleeper is separated with zincizing agent.
Further, said rare earth composite powder end comprises nano-cerium oxide (CeO
2) and nano lanthanum oxide (La
2O
3), the part by weight of the two is 1: 0.3～3, preferred ratio is 1: 1～2.The mean particle size at said rare earth composite powder end is 110nm, and wherein granularity is not less than 50% less than the powder volume content of 110nm.
Further, said acvator is ammonium chloride or zinc chloride, preferred ammonium chloride.
Further, said weighting agent is silica sand or aluminum oxide, preferred silica sand, and quartz sand size is 40～100 orders.
The pre-treatment of steel sleeper comprises: surface degreasing, rust cleaning, washing and drying.Surface degreasing can adopt Solvent degreasing commonly used, electrochemical deoiling, mechanical oil removing or wiping oil removing; Surface derusting adopts common chemical pickling or mechanical rust removal method, like roll cast, scrub, mechanical means such as sandblast or shot-peening.Steel sleeper behind the degreasing and rust removal obtains cleaning surfaces, exsiccant member after through washing and drying.
The aftertreatment of steel sleeper comprises: flushing, polished finish, Passivation Treatment and dry processing.Usually adopt 15% nitric acid to carry out chemical rightenning 10～25 seconds so that remove the black oxide or the remaining zinc powder of component surface, after the polishing immediately water acid is cleaned up; Carry out Passivation Treatment with chromic acid or chromatedsolution, to improve infiltration layer corrosion resistance or surface smoothness.
The present invention also provides a kind of method of steel sleeper, in order to solve defective of the prior art, has realized steel sleeper scratch resistance, shock resistance and anticorrosive, is applicable to railway territory, satisfies the harsh Service Environment requirement of railway, is specially adapted to the high-speed railway field.
A kind of steel sleeper is processed by the zinc impregnation processing method of said steel sleeper.
The zinc impregnation processing method of steel sleeper of the present invention and steel sleeper, scientific formulation, step is simple, compared with prior art, has following several respects advantage:
1, steel sleeper of the present invention top layer is one deck zinc-iron intermetallic compounds layer; This stratification compound and matrix steel sleeper are to combine with metallurgical mode that (atom mutual diffusion and the combination that forms mutually between the interface of two metals, this combination is connection state, is forming under the effect of temperature or pressure, under the temperature and pressure acting in conjunction.), thereby have superpower sticking power, even under operating modes such as high-frequency vibration, high speed impact, weather extremes and artificial destruction, also can keep excellent antiseptic property.
2, added the rare earth composite powder end in the penetration enhancer that the present invention adopts, added the last zincizing technology of rare earth composite powder and compare with traditional technology, the zincizing time shortens, coating compactness is strengthened and erosion resistance improves.Existing research thinks that the effect of cerium oxide is activation steel sleeper surface, thereby the diffusion process of accelerating zinc atom is practiced thrift the hot-work time; The effect of lanthanum trioxide then is the structure that influences the zinc-iron intermetallic compound, discovers that the zinc-iron intermetallic compound structure behind the interpolation lanthanum trioxide is fine and close more, and then improves the impelling strength (improving anti-gravel impact capacity) of corrosion resistance nature and zinc-iron alloy layer.
3, through experiment showed, the steel sleeper of a kind of micro-nano composite powder zinc impregnation processing treatment of the present invention, after actual environment was on active service 2 years, still keep excellent properties, comparing prior art has increased erosion resistance greatly.
Embodiment
For making the object of the invention, technical scheme and advantage clearer; To combine the embodiment of the invention below, the technical scheme in the embodiment of the invention carried out clear, intactly description, obviously; Described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Embodiment one:
The steel sleeper of a kind of micro-nano composite powder zinc impregnation processing treatment of the present invention comprises steel sleeper surface pre-treatment, steel sleeper surface zincizing processing and steel sleeper surface aftertreatment.
Steel sleeper surface pre-treatment comprises: to surface degreasing, rust cleaning, washing and the drying treatment of steel sleeper.Adopt Solvent degreasing, electrochemical deoiling, mechanical oil removing or wiping oil removing commonly used; Surface derusting adopts common chemical pickling or mechanical rust removal method, like roll cast, scrub, mechanical means such as sandblast or shot-peening.Steel sleeper behind the degreasing and rust removal obtains cleaning surfaces, exsiccant steel sleeper member after through washing and drying.
The zincizing processing of steel sleeper surface comprises: (1) is that 200 orders, zinc content are 99% zinc powder and nano composite rare earth (CeO with granularity
2And La
2O
3) powder, nano composite rare earth powder CeO
2And La
2O
3Weight ratio be 2: 1; The particle size diameter scope is 65nm～455nm, and mean particle size is 110nm, and wherein granularity is 70% less than the volume content of the powder of 110nm; Its consumption is 5% of a zinc powder weight; Mixed powder was 25 ℃ of following refinement milled processed of room temperature 16 hours, and being ground to powder size is 200～300 orders, then ground compound zinc powder, acvator ammonium chloride and weighting agent silica sand is mixed by following consumption: the ammonium chloride consumption is 0.1% of a zincizing agent weight; Quartz sand size is 40～100 orders, and the volume sum of its volume and compound zinc powder volume and workpiece equals 90% of zincizing tank volume.The zincizing jar that (2) steel sleeper and zincizing agent will be housed is placed in the zincizing furnace and heats, and the zincizing jar is with 7～15 rev/mins rotating speed rotation heating, and the TRT was controlled in 2.0～2.5 hours, when temperature is elevated to 300 ℃, kept homo(io)thermism 80 minutes.(3) treat that zincizing furnace is cooled to 100 ℃ after, the zincizing jar is hung out from zincizing furnace, carry out air cooling, treat that temperature is lower than below 50 ℃ after, take out steel sleeper and his-and-hers watches top blast and sweep, carry out aftertreatment then.
The aftertreatment of steel sleeper surface comprises: flushing, polished finish, Passivation Treatment and dry processing.Adopt 15% nitric acid to carry out chemical rightenning 10～25 seconds so that remove the black oxide or the remaining zinc powder of component surface, after the polishing immediately water acid is cleaned up; Carry out Passivation Treatment with chromic acid or chromatedsolution, to improve infiltration layer corrosion resistance or surface smoothness.
The thickness that experiment showed, the resulting steel sleeper zincizing of present embodiment coating is 40 microns, and hardness is 220HV, and the shock strength of zincizing coating improves (250J/cm
2), promptly fragility descends, and toughness improves.
Embodiment two:
The steel sleeper of a kind of micro-nano composite powder zinc impregnation processing treatment of the present invention comprises steel sleeper surface pre-treatment, steel sleeper surface zincizing processing and steel sleeper surface aftertreatment.
Steel sleeper surface pre-treatment comprises: the surface to steel sleeper is carried out oil removing, rust cleaning, washing and drying treatment successively.
Steel sleeper surface zincizing adds body of tool and comprises: (1) is that 250 orders, zinc content are 98% zinc powder and nano composite rare earth (CeO with granularity
2And La
2O
3) powder, nano composite rare earth powder CeO
2And La
2O
3Weight ratio be 1: 1; The particle size diameter scope is 65nm～455nm, and mean particle size is 110nm, and wherein granularity is 60% less than the volume content of the powder of 110nm; Its consumption is 8% of a zinc powder weight; Mixed powder was 25 ℃ of following refinement milled processed of room temperature 22 hours, and being ground to powder size is 200～300 orders, then ground compound zinc powder, acvator ammonium chloride and weighting agent silica sand is mixed by following consumption: the ammonium chloride consumption is 0.2% of a zincizing agent weight; Quartz sand size is 40～100 orders, and the volume sum of its volume and compound zinc powder volume and workpiece equals 92% of zincizing tank volume.The zincizing jar that (2) steel sleeper and zincizing agent will be housed is placed in the zincizing furnace and heats, and the zincizing jar is with 7～15 rev/mins rotating speed rotation heating, and the TRT was controlled in 2.0～2.5 hours, when temperature is elevated to 350 ℃, kept homo(io)thermism 80 minutes.(3) treat that zincizing furnace is cooled to 100 ℃ after, the zincizing jar is hung out from zincizing furnace, carry out air cooling, treat that temperature is lower than below 50 ℃ after, take out steel sleeper and his-and-hers watches top blast and sweep, carry out steel sleeper surface aftertreatment then.
The aftertreatment of steel sleeper surface comprises successively: flushing, polished finish, Passivation Treatment and dry processing.
The thickness that experiment showed, the resulting steel sleeper zincizing of present embodiment coating is 100 microns, and hardness is 250HV, and the shock strength of zincizing coating improves (240J/cm
2), promptly fragility descends, and toughness improves.
Embodiment three:
The steel sleeper of a kind of micro-nano composite powder zinc impregnation processing treatment of the present invention mainly comprises steel sleeper surface pre-treatment, steel sleeper surface zincizing processing and steel sleeper surface aftertreatment.
Steel sleeper surface pre-treatment comprises: the surface to steel sleeper is carried out oil removing, rust cleaning, washing and drying treatment successively.
Steel sleeper surface zincizing adds body of tool and comprises: (1) is that 300 orders, zinc content are 98% zinc powder and nano composite rare earth (CeO with granularity
2And La
2O
3) powder, nano composite rare earth powder CeO
2And La
2O
3Weight ratio be 1: 2; The particle size diameter scope is 65nm～455nm, and mean particle size is 110nm, and wherein granularity is 60% less than the volume content of the powder of 110nm; Its consumption is 10% of a zinc powder weight; Mixed powder was 25 ℃ of following refinement milled processed of room temperature 24 hours, and being ground to powder size is 200～300 orders, then ground compound zinc powder, acvator ammonium chloride and weighting agent silica sand is mixed by following consumption: the ammonium chloride consumption is 0.3% of a zincizing agent weight; Quartz sand size is 40～100 orders, and the volume sum of its volume and compound zinc powder volume and workpiece equals 95% of zincizing tank volume.The zincizing jar that (2) steel sleeper and zincizing agent will be housed is placed in the zincizing furnace and heats, and the zincizing jar is with 7～15 rev/mins rotating speed rotation heating, and the TRT was controlled in 2.0～2.5 hours, when temperature is elevated to 380 ℃, kept homo(io)thermism 80 minutes.(3) treat that zincizing furnace is cooled to 100 ℃ after, the zincizing jar is hung out from zincizing furnace, carry out air cooling, treat that temperature is lower than below 50 ℃ after, take out steel sleeper and his-and-hers watches top blast and sweep, carry out aftertreatment then.
The aftertreatment of steel sleeper surface comprises successively: flushing, polished finish, Passivation Treatment and dry processing.
The thickness that experiment showed, the resulting steel sleeper zincizing of present embodiment coating is 50 microns, and hardness is 200HV, and the shock strength of zincizing coating improves (260J/cm
2), promptly fragility descends, and toughness improves.
Reference examples
Adopt the steel sleeper surface pre-treatment and steel sleeper surface post-treating method identical with embodiment four, different with embodiment four is: the surperficial zincizing of steel sleeper is processed concrete steps and comprised: (1) is that 120 orders, zinc content are 99% zinc powder and nano composite rare earth CeO with granularity
2Powder; Nano composite rare earth powder size diameter range is 65nm～455nm, and mean particle size is 110nm, and wherein granularity is 60% less than the volume content of the powder of 110nm; Its consumption is 10% of a zinc powder weight; Mixed powder was 25 ℃ of following refinement milled processed of room temperature 24 hours, and being ground to powder size is 200～300 orders, then ground compound zinc powder, acvator ammonium chloride and weighting agent silica sand is mixed by following consumption: the ammonium chloride consumption is 0.3% of a zincizing agent weight; Quartz sand size is 40～100 orders, and the volume sum of its volume and compound zinc powder volume and workpiece equals 95% of zincizing tank volume.The zincizing jar that (2) steel sleeper and zincizing agent will be housed is placed in the zincizing furnace and heats, and the zincizing jar is with 7～15 rev/mins rotating speed rotation heating, and the TRT was controlled in 2.0～2.5 hours, when temperature is elevated to 380 ℃, kept homo(io)thermism 80 minutes.(3) treat that zincizing furnace is cooled to 100 ℃ after, the zincizing jar is hung out from zincizing furnace, carry out air cooling, treat that temperature is lower than below 50 ℃ after, take out steel sleeper and his-and-hers watches top blast and sweep, carry out the steel sleeper aftertreatment then.
Experiment showed, that the resulting steel sleeper zincizing of this reference examples coating hardness is 200HV, the shock strength of zincizing coating is 180J/cm
2
Embodiment four
Present embodiment obtains a kind of steel sleeper and is prepared from the zinc impregnation processing method of any one steel sleeper among the embodiment one to three.
The steel sleeper of above-mentioned three kinds of embodiment zincing methods preparation is made an experiment on the high-speed train track of Chinese Tangshan; Test that a small amount of rusty stain only appears in the steel sleeper surface after 2 years; And a large amount of corrosions has appearred in the steel sleeper of the zinc-rich coating technical finesse of adopting under the identical operating mode, and a small amount of localized cracks has appearred in the steel sleeper surface zinc-iron alloy layer that adopts reference examples to handle.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (5)
1. the zinc impregnation processing method of a steel sleeper comprises: steel sleeper surface pre-treatment, steel sleeper surface zincizing processing and steel sleeper surface aftertreatment is characterized in that the zincizing processing of said steel sleeper surface comprises the steps:
(1) preparation zincizing agent: zinc powder, rare earth composite powder end, acvator and weighting agent are carried out the refinement milled processed after by a certain amount of mixing,
Zinc content is greater than 98% in the said zinc powder, and granularity is 200～300 orders;
Said rare earth composite powder end comprises nano-cerium oxide and nano lanthanum oxide; Consumption is 5%～8% of a zinc powder weight; Said rare earth composite powder end particle size diameter scope is 65nm～455nm, and the part by weight of nano-cerium oxide and nano lanthanum oxide is 1: 1～2 in the said rare earth composite powder end;
The consumption of said acvator is 0.16～0.2% of a zincizing agent weight;
The volume sum of said weighting agent, compound zinc powder and steel sleeper equals 92%～95% of zincizing tank volume;
(2) zincizing is handled: steel sleeper member and the zincizing agent for preparing are filled in the zincizing jar; To load good zincizing jar then and be placed on heat temperature raising in the zincizing furnace; The zincizing jar makes the steel sleeper thermally equivalent in the zincizing jar with the heating of overturning of 7～15 rev/mins rotating speed, and the heat temperature raising time was controlled in 2～2.5 hours; When temperature reaches 300～420 ℃, kept homo(io)thermism 60～90 minutes; Form the zinc-iron intermetallic compound on the steel sleeper top layer, this stratification compound and matrix steel sleeper are to combine with metallurgical mode;
(3) steel sleeper cooling: after zincizing was finished dealing with, the zincizing jar was cooled to below 100 ℃ the zincizing jar taken out from zincizing furnace with zincizing furnace, continued to be cooled to temperature and was lower than 50 ℃, and steel sleeper is separated with zincizing agent.
2. the zinc impregnation processing method of steel sleeper according to claim 1 is characterized in that, the mean particle size at said rare earth composite powder end is 110nm, and wherein granularity is not less than 50% less than the powder volume content of 110nm.
3. the zinc impregnation processing method of steel sleeper according to claim 1 is characterized in that, said acvator is ammonium chloride or zinc chloride.
4. the zinc impregnation processing method of steel sleeper according to claim 1 is characterized in that, said weighting agent is silica sand or aluminum oxide.
5. a steel sleeper is characterized in that, is processed by the zinc impregnation processing method of any said steel sleeper of claim 1-4.
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| CN104233182A (en) * | 2013-06-14 | 2014-12-24 | 国家电网公司 | Zinc impregnation method used for steel member of electric power facility |
| CN103952661B (en) * | 2014-04-29 | 2016-06-01 | 西安理工大学 | A kind of pressed powder zincizing agent and its preparation method |
| CN104087896B (en) * | 2014-07-23 | 2016-06-22 | 郑州瑞能电气有限公司 | Fuse switch steel piece surface Zn-infiltrated alloy processing method |
| RU2557045C1 (en) * | 2014-07-29 | 2015-07-20 | Общество с ограниченной ответственностью "Полимерпром" | Thermodiffusion zinc coating |
| CN104561889A (en) * | 2014-12-17 | 2015-04-29 | 长治清华机械厂 | Zinc powder sherardizing method of machined steel product with no hydrogen embrittlement and low surface damage |
| CN105568214A (en) * | 2015-12-25 | 2016-05-11 | 天津先知邦科技股份有限公司 | Zinc impregnation processing method for cable support hanger and cable support hanger |
| CN110343997A (en) * | 2019-08-07 | 2019-10-18 | 郑州中原利达新材料有限公司 | A kind of powder zincizing penetration-assisting agent |
| RU2738218C1 (en) * | 2019-08-22 | 2020-12-09 | Общество с ограниченной ответственностью "ТЕХНОВАЦИНК" | Method of applying anticorrosion intermetallic coating by thermodiffusion zinc coating |
| CN113685470A (en) * | 2021-08-23 | 2021-11-23 | 南京科赫科技有限公司 | Efficient anti-corrosion disc spring and processing technology thereof |
| CN114015975A (en) * | 2021-11-08 | 2022-02-08 | 湖南昊宏新材料科技有限公司 | Zinc alloy material for zinc impregnation and corrosion prevention and method |
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