CN108677143A - A kind of corrosion-resistant internal combustion engine flywheel production process of surface treatment - Google Patents
A kind of corrosion-resistant internal combustion engine flywheel production process of surface treatment Download PDFInfo
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- CN108677143A CN108677143A CN201810496843.3A CN201810496843A CN108677143A CN 108677143 A CN108677143 A CN 108677143A CN 201810496843 A CN201810496843 A CN 201810496843A CN 108677143 A CN108677143 A CN 108677143A
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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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/0641—Nitrides
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
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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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/02—Pretreatment of the material to be coated
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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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
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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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
Abstract
The present invention provides a kind of corrosion-resistant internal combustion engine flywheel production process of surface treatment, is related to flywheel manufacture field, above-mentioned process of surface treatment includes the following steps：Oil quenching：Under nitrogen atmosphere, it will heat up kettle once to heat up, internal combustion engine flywheel be put into heating kettle, after secondary temperature elevation, heat preservation heats up three times, keeps the temperature, internal combustion engine flywheel is put into machine oil and is quenched, and after the completion of quenching, is tempered, takes out air-cooled into kettle；Passivation：Internal combustion engine flywheel after cooling is immersed in rare-earth salt solution, and co-catalyst is added in praseodymium chloride rare-earth salt solution, takes out internal combustion engine flywheel after dipping, under hot wind, rotary drying；Coating：Internal combustion engine flywheel after drying is put into vacuum coating equipment, internal combustion engine flywheel is subjected to titanium nitride overlay coating, and control thickness of coating, the present invention provides a kind of corrosion-resistant internal combustion engine flywheels to produce process of surface treatment, it is surface-treated by flywheels such as oil quenching, passivation, coating, its corrosion resistance is effectively increased while increasing flywheel hardness abrasion resistance.
Description
Technical field
The present invention relates to flywheel manufacture fields, and in particular to a kind of corrosion-resistant internal combustion engine flywheel production process of surface treatment.
Background technology
Flywheel is the prodigious disk-shaped part of rotary inertia, acts as an energy accumulator.For four cycle engines
For machine, every four piston stroke works done are primary, i.e. only expansion space stroke work done, and be vented, air inlet and compression three strokes all
Consume work(.Internal combustion engine is a kind of dynamic power machine, it is and the thermal energy released by making fuel in machine internal-combustion
It is converted directly into the Thermal Motor of power.
Flywheel on internal combustion engine often connects with crank, during actual use, flywheel is not only due to use for a long time and goes out
It now wears, a degree of corrosion phenomenon but will occur, lead to the replacement repeatedly of flywheel.
Invention content
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides a kind of corrosion-resistant internal combustion engine flywheels to produce process of surface treatment,
It is surface-treated by flywheels such as oil quenching, passivation, coating, it is corrosion-resistant to be effectively increased its while increasing flywheel hardness abrasion resistance
Property.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs：
A kind of corrosion-resistant internal combustion engine flywheel production process of surface treatment, includes the following steps：
(1) oil quenching：Under nitrogen atmosphere, it will heat up after kettle is once warming up to 140-150 DEG C, internal combustion engine flywheel be put into liter
In warm kettle, secondary temperature elevation keeps the temperature 50-90min to after 550-600 DEG C, is warming up to 600-650 DEG C three times, keeps the temperature 20-30min, will
Internal combustion engine flywheel is put into quenching in 10-20 DEG C of machine oil, after the completion of quenching, is tempered into kettle, and temperature is protected at 200-260 DEG C
After warm 3-4h, take out air-cooled；
(2) it is passivated：Internal combustion engine flywheel after cooling is immersed in rare-earth salt solution, and is added in praseodymium chloride rare-earth salt solution
Enter co-catalyst, after impregnating 2-3h at normal temperatures, takes out internal combustion engine flywheel, under 30-40 DEG C of hot wind, rotary drying；
(3) coating：Internal combustion engine flywheel after drying is put into vacuum coating equipment, internal combustion engine flywheel is subjected to titanium nitride table
Face coating, and control thickness of coating.
Preferably, the heating rate once to heat up described in step (1) is 10-20 DEG C/min.
Preferably, the heating rate of secondary temperature elevation described in step (1) is 50-55 DEG C/min.
Preferably, the heating rate to heat up three times described in step (1) is 20-25 DEG C/min.
Preferably, co-catalyst described in step (2) is citric acid.
Preferably, thickness of coating described in step (3) is 50-60 μm.
(3) advantageous effect
The present invention provides a kind of corrosion-resistant internal combustion engine flywheels to produce process of surface treatment, has the advantages that：
First, under nitrogen atmosphere by oil quenching process control, by controlling the rate temperature of primary heating and secondary temperature elevation,
So that the carbide in internal combustion engine flywheel is fully decomposed and is dissolved into austenite, base is provided for the transformation of follow-up austenite
Plinth further increases temperature when heating up three times so that a small amount of nitrogen-atoms penetrates into steel part surface layer, nitride is formed, to improve
Flywheel it is corrosion-resistant, secondly, by the way that flywheel is put into praseodymium chloride rare-earth salt solution, by flywheel surface formed rare earth conversion
Film, it is to be rotarily dried under hot wind to improve drying mode, further increases the corrosion-resistant of flywheel, finally, increases flywheel by oil quenching
While wearability is with hardness, titanium nitride coating is carried out by vacuum coating on flywheel surface, and control thickness of coating, reduce plating
Layer is to the change on flywheel dimension.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention,
Technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is the present invention one
Divide embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making
The every other embodiment obtained under the premise of creative work, shall fall within the protection scope of the present invention.
Embodiment 1：
A kind of corrosion-resistant internal combustion engine flywheel production process of surface treatment, includes the following steps：
(1) oil quenching：Under nitrogen atmosphere, it will heat up after kettle is once warming up to 140 DEG C with the rate of 10 DEG C/min, by internal combustion
Machine flywheel is put into heating kettle, with the rate secondary temperature elevation of 50 DEG C/min to after 550 DEG C, 50min is kept the temperature, with the speed of 20 DEG C/min
Rate is warming up to 600 DEG C three times, keeps the temperature 20min, internal combustion engine flywheel is put into 10 DEG C of machine oil and is quenched, after the completion of quenching, into kettle
Tempering, temperature is at 200 DEG C, after keeping the temperature 3h, takes out air-cooled.
(2) it is passivated：Internal combustion engine flywheel after cooling is immersed in rare-earth salt solution, and is added in praseodymium chloride rare-earth salt solution
Enter citric acid, after impregnating 2h at normal temperatures, takes out internal combustion engine flywheel, under 30-40 DEG C of hot wind, rotary drying；
(3) coating：Internal combustion engine flywheel after drying is put into vacuum coating equipment, internal combustion engine flywheel is subjected to titanium nitride table
Face coating, and it is 50 μm to control thickness of coating.
Embodiment 2：
A kind of corrosion-resistant internal combustion engine flywheel production process of surface treatment, includes the following steps：
(1) oil quenching：Under nitrogen atmosphere, it will heat up after kettle is once warming up to 150 DEG C with the rate of 20 DEG C/min, by internal combustion
Machine flywheel is put into heating kettle, with the rate secondary temperature elevation of 55 DEG C/min to after 600 DEG C, 90min is kept the temperature, with the speed of 25 DEG C/min
Rate is warming up to 650 DEG C three times, keeps the temperature 30min, internal combustion engine flywheel is put into 20 DEG C of machine oil and is quenched, after the completion of quenching, into kettle
Tempering, temperature is at 260 DEG C, after keeping the temperature 4h, takes out air-cooled.
(2) it is passivated：Internal combustion engine flywheel after cooling is immersed in rare-earth salt solution, and is added in praseodymium chloride rare-earth salt solution
Enter citric acid, after impregnating 3h at normal temperatures, takes out internal combustion engine flywheel, under 40 DEG C of hot wind, rotary drying；
(3) coating：Internal combustion engine flywheel after drying is put into vacuum coating equipment, internal combustion engine flywheel is subjected to titanium nitride table
Face coating, and it is 60 μm to control thickness of coating.
Embodiment 3：
A kind of corrosion-resistant internal combustion engine flywheel production process of surface treatment, includes the following steps：
(1) oil quenching：Under nitrogen atmosphere, it will heat up after kettle is once warming up to 145 DEG C with the rate of 15 DEG C/min, by internal combustion
Machine flywheel is put into heating kettle, with the rate secondary temperature elevation of 53 DEG C/min to after 555 DEG C, 60min is kept the temperature, with the speed of 23 DEG C/min
Rate is warming up to 624 DEG C three times, keeps the temperature 24min, internal combustion engine flywheel is put into 15 DEG C of machine oil and is quenched, after the completion of quenching, into kettle
Tempering, temperature is at 234 DEG C, after keeping the temperature 3h, takes out air-cooled.
(2) it is passivated：Internal combustion engine flywheel after cooling is immersed in rare-earth salt solution, and is added in praseodymium chloride rare-earth salt solution
Enter citric acid, after impregnating 2h at normal temperatures, takes out internal combustion engine flywheel, under 33 DEG C of hot wind, rotary drying；
(3) coating：Internal combustion engine flywheel after drying is put into vacuum coating equipment, internal combustion engine flywheel is subjected to titanium nitride table
Face coating, and it is 52 μm to control thickness of coating.
Embodiment 4：
A kind of corrosion-resistant internal combustion engine flywheel production process of surface treatment, includes the following steps：
(1) oil quenching：Under nitrogen atmosphere, it will heat up after kettle is once warming up to 148 DEG C with the rate of 11 DEG C/min, by internal combustion
Machine flywheel is put into heating kettle, with the rate secondary temperature elevation of 54 DEG C/min to after 570 DEG C, 75min is kept the temperature, with the speed of 23 DEG C/min
Rate is warming up to 630 DEG C three times, keeps the temperature 26min, internal combustion engine flywheel is put into 16 DEG C of machine oil and is quenched, after the completion of quenching, into kettle
Tempering, temperature is at 240 DEG C, after keeping the temperature 4h, takes out air-cooled.
(2) it is passivated：Internal combustion engine flywheel after cooling is immersed in rare-earth salt solution, and is added in praseodymium chloride rare-earth salt solution
Enter citric acid, after impregnating 2.6h at normal temperatures, takes out internal combustion engine flywheel, under 37 DEG C of hot wind, rotary drying；
(3) coating：Internal combustion engine flywheel after drying is put into vacuum coating equipment, internal combustion engine flywheel is subjected to titanium nitride table
Face coating, and it is 57 μm to control thickness of coating.
Embodiment 5：
A kind of corrosion-resistant internal combustion engine flywheel production process of surface treatment, includes the following steps：
(1) oil quenching：Under nitrogen atmosphere, it will heat up after kettle is once warming up to 150 DEG C with the rate of 12 DEG C/min, by internal combustion
Machine flywheel is put into heating kettle, with the rate secondary temperature elevation of 53 DEG C/min to after 560 DEG C, 88min is kept the temperature, with the speed of 24 DEG C/min
Rate is warming up to 650 DEG C three times, keeps the temperature 26min, internal combustion engine flywheel is put into 18 DEG C of machine oil and is quenched, after the completion of quenching, into kettle
Tempering, temperature is at 230 DEG C, after keeping the temperature 3h, takes out air-cooled.
(2) it is passivated：Internal combustion engine flywheel after cooling is immersed in rare-earth salt solution, and is added in praseodymium chloride rare-earth salt solution
Enter citric acid, after impregnating 2.3h at normal temperatures, takes out internal combustion engine flywheel, under 37 DEG C of hot wind, rotary drying；
(3) coating：Internal combustion engine flywheel after drying is put into vacuum coating equipment, internal combustion engine flywheel is subjected to titanium nitride table
Face coating, and it is 52 μm to control thickness of coating.
It is by 1-3 of the embodiment of the present invention and existing common interior in the market in order to better illustrate beneficial effects of the present invention
Combustion engine flywheel carries out wear-resisting, corrosion-resistant etc. performance comparison, and records data in following table, wherein neutral salt spray is real
It tests in chamber, 5.3% sodium chloride, the brine that pH value is 6.6 to be sprayed by spraying device, until experimental subjects
Surface there is etch state, and record the time.
As seen from the above table, corrosion-resistant internal combustion engine flywheel production process of surface treatment provided by the invention can effectively improve winged
The corrosion resistance of wheel improves the performance of flywheel comprehensively and at the same time reinforcing hardness, is suitble to large-scale promotion.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited including sentence "including a ...", it is not excluded that
There is also other identical elements in the process, method, article or apparatus that includes the element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations, although with reference to the foregoing embodiments
Invention is explained in detail, it will be understood by those of ordinary skill in the art that:It still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these modification or
It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (6)
1. a kind of corrosion-resistant internal combustion engine flywheel produces process of surface treatment, which is characterized in that include the following steps：
(1) oil quenching：Under nitrogen atmosphere, it will heat up after kettle is once warming up to 140-150 DEG C, internal combustion engine flywheel be put into heating kettle
In, secondary temperature elevation keeps the temperature 50-90min to after 550-600 DEG C, is warming up to 600-650 DEG C three times, 20-30min is kept the temperature, by internal combustion
Machine flywheel is put into quenching in 10-20 DEG C of machine oil, after the completion of quenching, is tempered into kettle, and temperature keeps the temperature 3- at 200-260 DEG C
After 4h, take out air-cooled；
(2) it is passivated：Internal combustion engine flywheel after cooling is immersed in rare-earth salt solution, and is added and helps in praseodymium chloride rare-earth salt solution
Catalyst after impregnating 2-3h at normal temperatures, takes out internal combustion engine flywheel, under 30-40 DEG C of hot wind, rotary drying；
(3) coating：Internal combustion engine flywheel after drying is put into vacuum coating equipment, internal combustion engine flywheel is subjected to titanium nitride surface plating
Layer, and control thickness of coating.
2. corrosion-resistant internal combustion engine flywheel as described in claim 1 produces process of surface treatment, which is characterized in that in step (1)
The heating rate once to heat up is 10-20 DEG C/min.
3. corrosion-resistant internal combustion engine flywheel as described in claim 1 produces process of surface treatment, which is characterized in that in step (1)
The heating rate of the secondary temperature elevation is 50-55 DEG C/min.
4. corrosion-resistant internal combustion engine flywheel as described in claim 1 produces process of surface treatment, which is characterized in that in step (1)
The heating rate to heat up three times is 20-25 DEG C/min.
5. corrosion-resistant internal combustion engine flywheel as described in claim 1 produces process of surface treatment, which is characterized in that in step (2)
The co-catalyst is citric acid.
6. corrosion-resistant internal combustion engine flywheel as described in claim 1 produces process of surface treatment, which is characterized in that in step (3)
The thickness of coating is 50-60 μm.
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