CN108505056A - A kind of highly corrosion resistant surface treatment method - Google Patents
A kind of highly corrosion resistant surface treatment method Download PDFInfo
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- CN108505056A CN108505056A CN201710587577.0A CN201710587577A CN108505056A CN 108505056 A CN108505056 A CN 108505056A CN 201710587577 A CN201710587577 A CN 201710587577A CN 108505056 A CN108505056 A CN 108505056A
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
-
- 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
-
- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention belongs to technical field of surface.The invention discloses a kind of highly corrosion resistant surface treatment methods comprising cleaning, sandblasting, ultrasonic cleaning, antirust treatment, degreasing, phosphatization and coating and etc..The present invention can be good at removing the oxide skin of workpiece surface and micro- rust using sprinkling and the method being cleaned by ultrasonic, adhesive force of the workpiece surface to coating can be improved using Zinc phosphating agent phosphorating treatment, use highly corrosion resistant molding powder to carry out coating treatment and workpiece after processing is enable to obtain higher corrosion resistance.
Description
Technical field
The present invention relates to technical field of surface, more particularly, to a kind of highly corrosion resistant surface treatment method.
Background technology
Prior art surface treatment includes mainly descale, degreasing, cleaning, phosphatization and dusts, in deoxidation
Then skin step carries out alramenting using the oxide skin after copper brush removal workpiece surface treated after being cleaned to workpiece
It the techniques such as dusts, by dusting, coating completely cuts off workpiece surface and air, and air is avoided to be in direct contact with workpiece surface and generate rust
Erosion, influences the performance of product.But in the above prior art, if at the method for use copper brush descale
, often there is the case where not cleaning up in reason, oxide skin is not known totally, even having carried out subsequent phosphorus in workpiece surface
Processing, the workpiece such as changing and dust still can be rusted, and its corrosion since inside workpiece and is spread, this is because not
In the oxide skin being fully apparent from containing one slightly rust etc. impurity and caused by；Simultaneously oxide skin is removed just with copper brush
Processing, since surface is difficult to handle totally, after molding powder spraying later, the adhesive ability of workpiece surface molding powder coating is very poor, easily
It falls off and molding powder layer is made to fail, and then the corrosion resistance of workpiece can be caused inadequate, product appearance and performance are difficult to meet
It is required that.
Invention content
To solve the above problems, the present invention provides a kind of workpiece surface oxide skins to understand that effect is good,
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of highly corrosion resistant surface treatment method, includes the following steps：
a）Cleaning：Workpiece surface is cleaned with cleaning agent, is dried after cleaning；
b）Sandblasting：Blasting treatment is carried out to workpiece surface；
c）It is cleaned by ultrasonic：Workpiece through above-mentioned process is cleaned by ultrasonic and is dried；
d）Antirust treatment：Workpiece after ultrasonic cleaning is first impregnated with neutral rust remover and removes micro- rust, cleaning workpiece after the completion of immersion,
It is used in combination aqueous rust preventive to carry out antirust treatment；
e）Degreasing：With degreasing agent to after above-mentioned antirust treatment workpiece handle, room temperature cleaning is carried out after the completion of ungrease treatment；
f）Phosphatization：Spray phosphorating treatment is carried out to workpiece with Zinc phosphating agent；
g）Coating：Surface coated treatment will be carried out through above-mentioned steps treated workpiece, using highly corrosion resistant molding powder to workpiece table
Face carries out coating treatment.
Preferably, in step a, the content of cleaning agent of grease stain is 3~5wt%, and cleaning temperature is 20~40 DEG C, after cleaning
The temperature of drying is 140~160 DEG C.
Preferably, in step b, the blast media of blasting treatment is the triangle steel sand of grain size 0.3mm, and hardness is
76HRC, blast time are 30~50 seconds.
Preferably, when being cleaned by ultrasonic in step c, cleaning temperature is 50~70 DEG C, and supersonic frequency is 20~90KHz, is dried
Dry temperature is 40~80 DEG C.
Preferably, the cleaning agent in step c is by heavy oil dirt cleaning agent, antirust agent and water 25：3：40 weight ratio composition.
Preferably, in step d, when the ferrous ion in neutral rust remover is higher than 100g/L, to neutral rust remover
It is replaced；Aqueous rust preventive is configured by antirust agent and water, and wherein the content of antirust agent is 3~5wt%.
Preferably, in step e, degreasing agent is metal spent meal, and skimming temp is 50~80 DEG C, free alkalinity is 10~
20, degreasing linear velocity is 2.3~2.8m/min.
Preferably, in step f, phosphatization temperature is 30~60 DEG C, and free acidity is 2~7, phosphatization linear velocity is 2.3~
2.8m/min。
Preferably, in step g, molding powder hardening time is 40~50min, and solidification temperature is 160~180 DEG C, applies thickness
Degree is 0.04~0.20mm.
Blasting treatment is carried out to workpiece surface, there is better descale effect compared to traditional copper brush processing；By
Workpiece surface is handled using high rigidity steel sand in the present invention, the oxidation that removal workpiece surface after heat treatment produces
Skin, the steel sand of high rigidity, in addition the blasting craft of high speed, can more effectively remove the oxide skin of workpiece surface, and can also go
Except micro- rust of workpiece surface, can also it prevent corrosion since inside workpiece；There is white uniformity with workpiece surface in blasting treatment
Subject to pit, it can be completed in general 30~50 seconds.
It is one dry that the processing such as subsequent cleaning, antirust, degreasing and phosphatization, which are provided to the workpiece surface before spraying molding powder,
Net surface can be such that the adhesive ability of coating increases in this way, the problems such as will not being fallen off after guarantee coating attachment
Therefore, the invention has the advantages that：The present invention can be good at removing using sprinkling and the method being cleaned by ultrasonic
The oxide skin of workpiece surface and micro- rust can improve adhesive force of the workpiece surface to coating using Zinc phosphating agent phosphorating treatment,
Using highly corrosion resistant molding powder to carry out coating treatment enables workpiece after processing to obtain higher corrosion resistance.
Specific implementation mode
Technical scheme of the present invention is further described With reference to embodiment.
Obviously, the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, all other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
Embodiment 1
A kind of highly corrosion resistant surface treatment method, includes the following steps：
a）Cleaning：Workpiece surface is cleaned with cleaning agent, is dried after cleaning；The content of cleaning agent of grease stain is 3wt%, cleaning
Temperature is 20 DEG C, and the temperature dried after cleaning is 140 DEG C；
b）Sandblasting：Blasting treatment is carried out to workpiece surface；The blast media of blasting treatment is the triangle steel sand of grain size 0.3mm,
Hardness is 76HRC, and blast time is 30 seconds；
c）It is cleaned by ultrasonic：Workpiece through above-mentioned process is cleaned by ultrasonic and is dried；Cleaning temperature is when ultrasonic cleaning
50 DEG C, supersonic frequency 20KHz, drying temperature is 40 DEG C；Cleaning agent is by heavy oil dirt cleaning agent, antirust agent and water 25：3：40
Weight ratio forms；
d）Antirust treatment：Workpiece after ultrasonic cleaning is first impregnated with neutral rust remover and removes micro- rust, cleaning workpiece after the completion of immersion,
It is used in combination aqueous rust preventive to carry out antirust treatment；When the ferrous ion in neutral rust remover be higher than 100g/L when, to neutral rust remover into
Row is replaced；Aqueous rust preventive is configured by antirust agent and water, and wherein the content of antirust agent is 3wt%；
e）Degreasing：With degreasing agent to after above-mentioned antirust treatment workpiece handle, room temperature cleaning is carried out after the completion of ungrease treatment；
Degreasing agent is metal spent meal, and skimming temp is 50 DEG C, and free alkalinity 10, degreasing linear velocity is 2.3m/min；
f）Phosphatization：Spray phosphorating treatment is carried out to workpiece with Zinc phosphating agent；Phosphatization temperature is 30 DEG C, free acidity 2, phosphatization
Linear velocity is 2.3m/min；
g）Coating：Surface coated treatment will be carried out through above-mentioned steps treated workpiece, using highly corrosion resistant molding powder to workpiece table
Face carries out coating treatment；Molding powder hardening time is 40min, and solidification temperature is 160 DEG C, coating layer thickness 0.04mm.
Embodiment 2
A kind of highly corrosion resistant surface treatment method, includes the following steps：
a）Cleaning：Workpiece surface is cleaned with cleaning agent, is dried after cleaning；The content of cleaning agent of grease stain is 3.5wt%, clearly
It is 25 DEG C to wash temperature, and the temperature dried after cleaning is 145 DEG C；
b）Sandblasting：Blasting treatment is carried out to workpiece surface；The blast media of blasting treatment is the triangle steel sand of grain size 0.3mm,
Hardness is 76HRC, and blast time is 35 seconds；
c）It is cleaned by ultrasonic：Workpiece through above-mentioned process is cleaned by ultrasonic and is dried；Cleaning temperature is when ultrasonic cleaning
55 DEG C, supersonic frequency 40KHz, drying temperature is 50 DEG C；Cleaning agent is by heavy oil dirt cleaning agent, antirust agent and water 25：3：40
Weight ratio forms；
d）Antirust treatment：Workpiece after ultrasonic cleaning is first impregnated with neutral rust remover and removes micro- rust, cleaning workpiece after the completion of immersion,
It is used in combination aqueous rust preventive to carry out antirust treatment；When the ferrous ion in neutral rust remover be higher than 100g/L when, to neutral rust remover into
Row is replaced；Aqueous rust preventive is configured by antirust agent and water, and wherein the content of antirust agent is 3.5wt%；
e）Degreasing：With degreasing agent to after above-mentioned antirust treatment workpiece handle, room temperature cleaning is carried out after the completion of ungrease treatment；
Degreasing agent is metal spent meal, and skimming temp is 60 DEG C, and free alkalinity 15, degreasing linear velocity is 2.5m/min；
f）Phosphatization：Spray phosphorating treatment is carried out to workpiece with Zinc phosphating agent；Phosphatization temperature is 40 DEG C, free acidity 4, phosphatization
Linear velocity is 2.5m/min；
g）Coating：Surface coated treatment will be carried out through above-mentioned steps treated workpiece, using highly corrosion resistant molding powder to workpiece table
Face carries out coating treatment；Molding powder hardening time is 45min, and solidification temperature is 165 DEG C, coating layer thickness 0.09mm.
Embodiment 3
A kind of highly corrosion resistant surface treatment method, includes the following steps：
a）Cleaning：Workpiece surface is cleaned with cleaning agent, is dried after cleaning；The content of cleaning agent of grease stain is 4.5wt%, clearly
It is 35 DEG C to wash temperature, and the temperature dried after cleaning is 155 DEG C；
b）Sandblasting：Blasting treatment is carried out to workpiece surface；The blast media of blasting treatment is the triangle steel sand of grain size 0.3mm,
Hardness is 76HRC, and blast time is 45 seconds；
c）It is cleaned by ultrasonic：Workpiece through above-mentioned process is cleaned by ultrasonic and is dried；Cleaning temperature is when ultrasonic cleaning
65 DEG C, supersonic frequency 70KHz, drying temperature is 70 DEG C；Cleaning agent is by heavy oil dirt cleaning agent, antirust agent and water 25：3：40
Weight ratio forms；
d）Antirust treatment：Workpiece after ultrasonic cleaning is first impregnated with neutral rust remover and removes micro- rust, cleaning workpiece after the completion of immersion,
It is used in combination aqueous rust preventive to carry out antirust treatment；When the ferrous ion in neutral rust remover be higher than 100g/L when, to neutral rust remover into
Row is replaced；Aqueous rust preventive is configured by antirust agent and water, and wherein the content of antirust agent is 4.5wt%；
e）Degreasing：With degreasing agent to after above-mentioned antirust treatment workpiece handle, room temperature cleaning is carried out after the completion of ungrease treatment；
Degreasing agent is metal spent meal, and skimming temp is 70 DEG C, and free alkalinity 15, degreasing linear velocity is 2.6m/min；
f）Phosphatization：Spray phosphorating treatment is carried out to workpiece with Zinc phosphating agent；Phosphatization temperature is 50 DEG C, free acidity 5, phosphatization
Linear velocity is 2.6m/min；
g）Coating：Surface coated treatment will be carried out through above-mentioned steps treated workpiece, using highly corrosion resistant molding powder to workpiece table
Face carries out coating treatment；Molding powder hardening time is 45min, and solidification temperature is 175 DEG C, coating layer thickness 0.15mm.
Embodiment 4
A kind of highly corrosion resistant surface treatment method, includes the following steps：
a）Cleaning：Workpiece surface is cleaned with cleaning agent, is dried after cleaning；The content of cleaning agent of grease stain is 5wt%, cleaning
Temperature is 40 DEG C, and the temperature dried after cleaning is 160 DEG C；
b）Sandblasting：Blasting treatment is carried out to workpiece surface；The blast media of blasting treatment is the triangle steel sand of grain size 0.3mm,
Hardness is 76HRC, and blast time is 50 seconds；
c）It is cleaned by ultrasonic：Workpiece through above-mentioned process is cleaned by ultrasonic and is dried；Cleaning temperature is when ultrasonic cleaning
70 DEG C, supersonic frequency 90KHz, drying temperature is 80 DEG C；Cleaning agent is by heavy oil dirt cleaning agent, antirust agent and water 25：3：40
Weight ratio forms；
d）Antirust treatment：Workpiece after ultrasonic cleaning is first impregnated with neutral rust remover and removes micro- rust, cleaning workpiece after the completion of immersion,
It is used in combination aqueous rust preventive to carry out antirust treatment；When the ferrous ion in neutral rust remover be higher than 100g/L when, to neutral rust remover into
Row is replaced；Aqueous rust preventive is configured by antirust agent and water, and wherein the content of antirust agent is 5wt%；
e）Degreasing：With degreasing agent to after above-mentioned antirust treatment workpiece handle, room temperature cleaning is carried out after the completion of ungrease treatment；
Degreasing agent is metal spent meal, and skimming temp is 80 DEG C, and free alkalinity 20, degreasing linear velocity is 2.8m/min；
f）Phosphatization：Spray phosphorating treatment is carried out to workpiece with Zinc phosphating agent；Phosphatization temperature is 60 DEG C, free acidity 7, phosphatization
Linear velocity is 2.8m/min；
g）Coating：Surface coated treatment will be carried out through above-mentioned steps treated workpiece, using highly corrosion resistant molding powder to workpiece table
Face carries out coating treatment；Molding powder hardening time is 50min, and solidification temperature is 180 DEG C, coating layer thickness 0.20mm.
The material of workpiece in above-described embodiment is ferroalloy；
Cleaning agent of grease stain in above-described embodiment is HJ-921AC cleaning agent of grease stain, and heavy oil dirt cleaning agent is FH-QX001 heavy oil stains
Cleaning agent, antirust agent are 001 antirust agent of FH-FX (R), and neutral rust remover is 911 rust removers of Rust remover, and aqueous rust preventive is
The multi-functional antirust agent of JS-3, highly corrosion resistant molding powder are the black TH9808 molding powders of zero diopter.
Corrosion resistance is tested：
To the 10CC test handled through above-described embodiment（10 cycles cyclic corrosion test）And it recycles for 10 weeks
Corrosion test；Each cycle specially Monday is 24 hours salt spray tests wherein in this test；Tuesday to Friday is 8 points to 16 points
Condensed water Constant Climate experiment is carried out under the conditions of 40 DEG C, restored at room temperature at 16 points to second day 8 points；Saturday to Sunday
Restore at room temperature；After 10CC test U is characterized according to the corrosion-resistant testing standard GS90011-AA-0224 of BMWdIt is corrosion-resistant
Performance indicator.
Comparative example：Comparative example process of surface treatment is by descale, degreasing, cleaning, phosphatization and to dust to workpiece surface
It is handled, wherein except descale technique is to brush the oxide skin of workpiece surface with copper brush, other processing steps then use real
Corresponding processing method in example 1 is applied to be handled（Cleaning step is pressed the ultrasonic cleaning step in embodiment 1 and is carried out but without ultrasound
Processing, step of dusting are handled by the coating process in embodiment 1）.
Corrosion resistance test result：
Comparative example：
Embodiment 1：Ud=0.89；
Embodiment 2：Ud=0.86；
Embodiment 3：Ud=0.91；
Embodiment 4：Ud=0.90；
The U in the corrosion-resistant testing standard GS90011-AA-0224 of BMWdIt is to meet the requirements less than 2mm, it can be seen that, it uses
After surface treatment method in the present invention handles workpiece, corrosion resistance is greatly improved compared with the prior art, and
Can meet the needs of high-end customer.
It should be understood that those skilled in the art, can be improved or be become according to the above description
It changes, and all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (9)
1. a kind of highly corrosion resistant surface treatment method, it is characterised in that include the following steps：
a）Cleaning：Workpiece surface is cleaned with cleaning agent, is dried after cleaning；
b）Sandblasting：Blasting treatment is carried out to workpiece surface；
c）It is cleaned by ultrasonic：Workpiece through above-mentioned process is cleaned by ultrasonic and is dried；
d）Antirust treatment：Workpiece after ultrasonic cleaning is first impregnated with neutral rust remover and removes micro- rust, cleaning workpiece after the completion of immersion,
It is used in combination aqueous rust preventive to carry out antirust treatment；
e）Degreasing：With degreasing agent to after above-mentioned antirust treatment workpiece handle, room temperature cleaning is carried out after the completion of ungrease treatment；
f）Phosphatization：Spray phosphorating treatment is carried out to workpiece with Zinc phosphating agent；
g）Coating：Surface coated treatment will be carried out through above-mentioned steps treated workpiece, using highly corrosion resistant molding powder to workpiece table
Face carries out coating treatment.
2. a kind of highly corrosion resistant surface treatment method according to claim 1, it is characterised in that：
In the step a, the content of cleaning agent of grease stain is 3~5wt%, and cleaning temperature is 20~40 DEG C, the temperature dried after cleaning
It is 140~160 DEG C.
3. a kind of highly corrosion resistant surface treatment method according to claim 1, it is characterised in that：
In the step b, the blast media of blasting treatment is the triangle steel sand of grain size 0.3mm, hardness 76HRC, when sandblasting
Between be 30~50 seconds.
4. a kind of highly corrosion resistant surface treatment method according to claim 1, it is characterised in that：
When being cleaned by ultrasonic in the step c, cleaning temperature is 50~70 DEG C, and supersonic frequency is 20~90KHz, drying temperature 40
~80 DEG C.
5. a kind of highly corrosion resistant surface treatment method according to claim 1 or 4, it is characterised in that：
Cleaning agent in the step c is by heavy oil dirt cleaning agent, antirust agent and water 25：3：40 weight ratio composition.
6. a kind of highly corrosion resistant surface treatment method according to claim 1, it is characterised in that：
In the step d, when the ferrous ion in neutral rust remover is higher than 100g/L, neutral rust remover is replaced；
Aqueous rust preventive is configured by antirust agent and water, and wherein the content of antirust agent is 3~5wt%.
7. a kind of highly corrosion resistant surface treatment method according to claim 1, it is characterised in that：
In the step e, degreasing agent is metal spent meal, and skimming temp is 50~80 DEG C, and free alkalinity is 10~20, degreasing line
Speed is 2.3~2.8m/min.
8. a kind of highly corrosion resistant surface treatment method according to claim 1, it is characterised in that：
In the step f, phosphatization temperature is 30~60 DEG C, and free acidity is 2~7, and phosphatization linear velocity is 2.3~2.8m/min.
9. a kind of highly corrosion resistant surface treatment method according to claim 1, it is characterised in that：
In the step g, molding powder hardening time be 40~50min, solidification temperature be 160~180 DEG C, coating layer thickness be 0.04~
0.20mm。
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Application publication date: 20180907 |