CN110117758B - Low-temperature impact resistant instrument shell part and preparation method thereof - Google Patents
Low-temperature impact resistant instrument shell part and preparation method thereof Download PDFInfo
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- CN110117758B CN110117758B CN201910473440.1A CN201910473440A CN110117758B CN 110117758 B CN110117758 B CN 110117758B CN 201910473440 A CN201910473440 A CN 201910473440A CN 110117758 B CN110117758 B CN 110117758B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
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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
- 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
- C23C22/82—After-treatment
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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
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/20—Use of solutions containing silanes
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Abstract
The application discloses instrument shell parts resistant to low-temperature impact and a preparation method thereof, the parts comprise a cold-rolled steel plate or hot-dip galvanized steel plate matrix layer, and the matrix layer comprises the following chemical components in percentage by mass: 0.0010-0.0030% of C, 0.15-0.25% of Mn, less than or equal to 0.10% of Si, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.02-0.06% of Als, 0.05-0.09% of Ti, 0.01-0.03% of Nb, 0.0005-0.0020% of B, 0.001-0.003% of N, and the balance of Fe and inevitable impurities, wherein a chemical treatment film layer is formed on the substrate layer, a paint coating layer is formed on the chemical treatment film layer, the chemical treatment film layer comprises organosilane, fluorozirconate and fluorotitanate, and the paint coating layer comprises resin and toughening agent. The invention has the advantages of solving the technical problems that the existing instrument shell parts are easy to crack under the low-temperature environment and have insufficient corrosion resistance in long-term use, prolonging the service life and enlarging the application range.
Description
Technical Field
The application relates to an instrument shell part, in particular to a low-temperature impact resistant instrument shell part and a preparation method thereof.
Background
The instrument shell part is used as an external covering part and mainly plays a role in supporting and protecting an internal core component of the instrument, the preparation materials are mainly divided into metal, plastic and other composite materials, metal stainless steel and aluminum alloy have good formability and corrosion resistance, but the cost is higher, plastic has low cost but poor general strength and toughness, the external force damage resistance is weak, and the instrument shell part is easy to age under illumination, high temperature or low temperature, and the application range is limited. At present, common instrument shell parts are manufactured by adopting a common low-carbon steel processing and forming method and a surface phosphating painting treatment method, can meet the use requirements of most instruments, but have the problems of high safety requirements and long stable service life of household gas meters, special industrial instruments and the like, leakage risk caused by insufficient shock resistance at low temperature, shortened service life caused by reduced corrosion resistance in cold and hot environments and the like.
Disclosure of Invention
The invention aims to provide a low-temperature impact resistant instrument shell part and a preparation method thereof, solves the technical problems that the existing instrument shell part is easy to crack under a low-temperature environment and has insufficient corrosion resistance in long-term use, prolongs the service life and expands the application range.
In order to achieve the purpose, the invention provides the following technical scheme:
the embodiment of the application discloses instrument case part of low temperature impact resistance, including cold-rolled steel sheet or hot dip galvanized steel sheet base member layer, base member layer chemical composition mass percent content includes: 0.0010-0.0030% of C, 0.15-0.25% of Mn, less than or equal to 0.10% of Si, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.02-0.06% of Als, 0.05-0.09% of Ti, 0.01-0.03% of Nb, 0.0005-0.0020% of B, 0.001-0.003% of N, and the balance of Fe and inevitable impurities, wherein a chemical treatment film layer is formed on the substrate layer, a paint coating layer is formed on the chemical treatment film layer, the chemical treatment film layer comprises organosilane, fluorozirconate and fluorotitanate, and the paint coating layer comprises resin and toughening agent.
Correspondingly, the preparation method of the low-temperature impact resistant instrument shell part comprises the following steps in sequence:
s1, the cold-rolled steel plate or the hot-dip galvanized steel plate is processed by stamping, punching, flanging, trimming and welding to form the base layer of the instrument shell part;
s2, degreasing and rinsing the surface of the substrate layer;
s3, performing surface silane treatment on the substrate layer to form the chemical treatment film layer;
s4 rinsing and drying;
s5, performing electrostatic powder spraying on the chemical treatment film layer;
s6, baking and curing to form the paint coating;
s7 cooling, taking out at room temperature to obtain the finished part.
Further, in the method for manufacturing the low temperature impact resistant instrument case part, in step S3, the surface silane treatment time is 1-2 min.
Further, in the preparation method of the low-temperature impact resistant instrument shell part, in step S5, thermosetting powder coating is adopted for electrostatic powder spraying, and the electrostatic powder spraying amount is 75-150 g/m2The thickness of the powder layer is 50-100 μm.
Further, in the preparation method of the low-temperature impact resistant instrument shell part, in the step S6, the baking is carried out in a gas radiation heating mode, the temperature of the baking furnace is 220-250 ℃, the temperature of the part during baking is 180-220 ℃, and the baking time is 15-20 min.
Further, in the preparation method of the low-temperature impact resistant instrument shell part, in the step S7, air cooling is adopted, and the cooling speed is 5-10 ℃/S.
The instrument shell part has the following characteristics and technical principles:
the part is made of three layers, namely a base layer (with the thickness of 0.5-2.0 mm), a chemical treatment film layer (with the thickness of 0.05-0.2 mu m) and a paint coating layer (with the thickness of 50-100 mu m), wherein the base layer is a cold-rolled steel plate or a hot-dip galvanized steel plate; the base layer is made of interstitial-free steel with specific components and process design, has good stamping formability and low-temperature impact resistance, and effectively avoids the problem of low-temperature impact cracking after a common steel plate is processed into parts; the chemical treatment film layer is formed by reacting a silane treatment agent with the surface of the steel plate substrate, has good compactness, surface isolation and paint adhesion, and does not discharge phosphorus-containing wastewater in the production process; the paint coating layer is an organic layer formed by baking and curing a resin powder coating with high toughness and weather resistance, has excellent environmental corrosion resistance, and simultaneously has good paint layer hardness and toughness capable of resisting damage of external force to the surface of a part.
The action and mechanism of each element of the steel plate matrix are as follows:
c, the forming performance of the steel plate can be effectively improved by reducing the carbon content, the steel plate for deep drawing parts or deformed complex parts is generally designed by adopting an ultra-low carbon component, the good stamping forming performance can be obtained by controlling the C content to be 0.0030 percent, meanwhile, the content of alloy elements required by fixing C is reduced, the manufacturing cost is obviously increased by further reducing the C content to be 0.0010 percent, and therefore, the C content is controlled to be 0.0010 to 0.0030 percent.
Mn and Mn are common solid solution strengthening elements, a small amount of Mn is added into the ultra-low carbon steel grade to ensure the strength of the steel plate and not obviously reduce the plasticity, but the high strength is caused by the excessively high Mn content and is not beneficial to processing, the cost can be increased while the Mn/S ratio is kept to be more than 20, and therefore the Mn content is controlled to be 0.15-0.25%.
Si, an increase in Si content impairs the platability of the steel sheet and affects the surface quality and the coating adhesion, and the lower the Si content, the better, so the Si content is selected to be controlled to 0.10% or less.
Als and aluminum are strong deoxidizing agents, the oxygen content in molten steel can be effectively reduced by adopting Al deoxidation, and the defect of air holes is prevented, but the surface quality is unfavorable due to excessively high Al, so that the Al content is controlled to be 0.02-0.06%.
P, which is a material that is likely to cause secondary work embrittlement of the steel sheet and deteriorate the low-temperature impact resistance of the steel sheet, is selected to be 0.012% or less because the P content is reduced as much as possible.
S is selected to be 0.0050% or less because S is easily bonded to Mn to form MnS inclusions, which is disadvantageous in steel sheet formation and minimizes the S content in steel.
N, nitrogen is a solid solution atom which is not good for the formability of the steel sheet, and the content of N is controlled to 0.0030% or less to effectively avoid the deterioration of plasticity, but the production cost is increased by further reducing the content of N, so that the content of N is selected to be 0.001 to 0.003% N.
Nb and niobium are microalloying elements, C in steel can be fixed to form a precipitated phase, the grain size is refined, the anisotropy of the steel plate is reduced, the toughness of the steel plate is improved, the low-temperature brittleness is reduced, the high strength is easy to cause and is not beneficial to processing and forming, and the cost is increased, so the Nb content is controlled to be 0.01-0.03%.
Ti and titanium are microalloying elements, N in steel can be fixed to form a precipitated phase, the forming capability of the steel plate is improved, too high Ti content easily causes higher strength and is not beneficial to processing and forming and cost increase, and therefore the Ti content is selected to be controlled to be 0.05-0.09%.
B is a microalloying element, and competes with P element to precipitate at a grain boundary, so that the grain boundary is strengthened, the secondary processing brittleness of the steel plate is reduced, the low-temperature impact resistance of a part is improved, but the hot brittleness phenomenon of a steel billet is easily caused by the excessively high content of B, the hot processing performance of the steel is influenced, and the rolling deformation is difficult, so that the content of B is selected to be controlled to be 0.0005-0.0020%.
The function principle and effect of the preparation method of the low-temperature impact resistant instrument shell part are specifically explained as follows:
degreasing, cleaning and drying the surface, and aims to remove oil stains, scrap iron, water stains and other impurities on the surface of the matrix layer to obtain a clean surface, thereby being beneficial to forming a good film layer.
And (2) performing surface silane treatment, namely immersing the steel plate substrate into an organosilane solution, adsorbing the organosilane on the surface of the substrate to form a Fe-O-Si covalent bond, performing hydrolysis, condensation and film-forming reaction on the silane to form a uniform and compact chemical conversion film layer on the surface of the steel plate substrate, wherein the fluotitanate and the fluozirconate in the solution play a role of an inorganic corrosion inhibitor, and the film layer with better corrosion resistance is obtained.
Electrostatic powder spraying is carried out to uniformly cover a layer of powder coating on the surface of a substrate, and the powder spraying amount is controlled to be 75-150 g/m2So as to form a paint coating with proper thickness and avoid the quality problems of insufficient corrosion resistance, paint layer cracking and the like caused by thin or thick film thickness.
And baking and curing, namely heating the part to a certain temperature, carrying out a melting crosslinking reaction on the powder coating, forming a flat and compact organic layer on the surface of the part, ensuring that the part is uniformly heated by adopting a radiation heating mode, being beneficial to the reaction consistency of paint layers at different parts of the part, and being suitable for baking and curing complex shapes, wherein the temperature of a baking furnace is 220-250 ℃, the temperature of the part is controlled to be 180-220 ℃, the baking time is 15-20 min, and the curing reaction is ensured to be sufficient so as to obtain the paint layer with excellent performance.
And air cooling treatment is carried out, the cooling speed is controlled to be 5-10 ℃/s, the stress of the film layer is reduced by controlling the integral uniform cooling of the parts, and the cracking of the paint layer is avoided.
Compared with the prior art, the invention has the advantages of excellent low-temperature impact resistance and corrosion resistance, and obviously improves the service life and safety of the instrument shell under low-temperature and corrosive climates; the used material has large degree of deformation and is suitable for instruments with complex appearance; compared with stainless steel, aluminum alloy and the like, the production cost of parts is low; meanwhile, the production process is environment-friendly, and no phosphorus-containing wastewater and VOC are discharged.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view showing the parts of the instrument case resistant to low-temperature impact in example 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the instrument case part with low temperature impact resistance prepared by the invention comprises a cold-rolled steel plate or hot-dip galvanized steel plate substrate layer 1, a chemical treatment film layer 2 is formed on the substrate layer 1, a paint coating layer 3 is formed on the chemical treatment film layer 2, the chemical treatment film layer 2 comprises organosilane, fluorozirconate and fluorotitanate, the paint coating layer 3 comprises resin and toughening agent, and the substrate layer 1 comprises the following chemical components in percentage by mass: 0.0010 to 0.0030% of C, 0.15 to 0.25% of Mn, 0.10% or less of Si, 0.012% or less of P, 0.005% or less of S, 0.02 to 0.06% of Als, 0.05 to 0.09% of Ti, 0.01 to 0.03% of Nb, 0.0005 to 0.0020% of B, 0.001 to 0.003% of N, and the balance of Fe and inevitable impurities.
The preparation method sequentially comprises the following steps:
s1 the cold-rolled steel plate or the hot-dip galvanized steel plate is processed by stamping, punching, flanging, trimming and welding to form a base layer 1 of the instrument shell part;
s2, degreasing and rinsing the surface of the substrate layer 1;
s3, carrying out surface silane treatment on the substrate layer 1 for 1-2min to form a chemical treatment film layer 2;
s4 rinsing and drying;
s5 performing electrostatic powder spraying on the chemical treatment film layer 2, and performing electrostatic powder spraying by adopting thermosetting powder coating, wherein the electrostatic powder spraying amount is 75-150 g/m2The thickness of the powder layer is 50-100 mu m;
s6, baking and curing, wherein the baking is carried out in a gas radiation heating mode, the temperature of a baking furnace is 220-250 ℃, the temperature of parts during baking is 180-220 ℃, and the baking time is 15-20 min, so that a paint coating layer 3 is formed;
and S7, cooling by air cooling at the cooling speed of 5-10 ℃/S, and taking out at room temperature to prepare the part.
The instrument case parts resistant to low-temperature impact and the preparation method thereof are exemplarily illustrated by 10 groups of examples, and in examples 1 to 10, the mass percentages of chemical components in the matrix layer are shown in the following table:
| examples | C/％ | Mn/％ | Si/％ | P/％ | S/％ | Als/％ | Nb/％ | Ti/％ | B/％ | N/％ |
| Example 1 | 0.0019 | 0.15 | 0.02 | 0.010 | 0.0025 | 0.042 | 0.028 | 0.061 | 0.0011 | 0.0022 |
| Example 2 | 0.0012 | 0.16 | 0.08 | 0.012 | 0.0020 | 0.025 | 0.010 | 0.090 | 0.0012 | 0.0028 |
| Example 3 | 0.0015 | 0.18 | 0.06 | 0.009 | 0.0040 | 0.040 | 0.015 | 0.085 | 0.0020 | 0.0030 |
| Example 4 | 0.0010 | 0.16 | 0.02 | 0.008 | 0.0030 | 0.050 | 0.015 | 0.088 | 0.0018 | 0.0027 |
| Example 5 | 0.0010 | 0.25 | 0.10 | 0.007 | 0.0020 | 0.045 | 0.013 | 0.050 | 0.0016 | 0.0024 |
| Example 6 | 0.0030 | 0.25 | 0.08 | 0.008 | 0.0025 | 0.050 | 0.025 | 0.050 | 0.0005 | 0.0016 |
| Example 7 | 0.0029 | 0.24 | 0.06 | 0.006 | 0.0035 | 0.060 | 0.030 | 0.055 | 0.0007 | 0.0014 |
| Example 8 | 0.0025 | 0.22 | 0.10 | 0.008 | 0.0050 | 0.030 | 0.030 | 0.070 | 0.0010 | 0.0010 |
| Example 9 | 0.0020 | 0.20 | 0.08 | 0.010 | 0.0050 | 0.020 | 0.012 | 0.060 | 0.0012 | 0.0012 |
| Example 10 | 0.0022 | 020 | 0.07 | 0.012 | 0.0045 | 0.025 | 0.015 | 0.065 | 0.0016 | 0.0010 |
The process parameters of the preparation of examples 1-10, surface silane treatment time, electrostatic powder injection amount, baking furnace temperature, part temperature during baking, baking time and cooling rate are shown in the following table:
the low temperature impact resistance test was performed on the parts obtained in examples 1 to 10 (test method: the parts were placed in a low-temperature chamber at-25 ℃ and kept at a constant temperature for 5 hours, then the parts were taken out, the R-corner region of the parts was immediately subjected to a ball drop impact test with a drop height of 1m and a weight of 7.5kg, and whether cracking occurred or not was checked), and the paint film adhesion (one-hundred-grid method) and corrosion resistance (neutral salt spray test) were examined, with the results shown in the following table:
| examples | Low temperature impact resistance test | Paint film adhesion test | Corrosion resistance (time to red rust) |
| Example 1 | Without cracking | No paint layer falling off | ＞1200h |
| Example 2 | Without cracking | No paint layer falling off | ＞1200h |
| Example 3 | Without cracking | No paint layer falling off | ＞1200h |
| Example 4 | Without cracking | No paint layer falling off | ＞1200h |
| Example 5 | Without cracking | No paint layer falling off | ＞1200h |
| Example 6 | Without cracking | No paint layer falling off | ＞1200h |
| Example 7 | Without cracking | No paint layer falling off | ＞1500h |
| Example 8 | Without cracking | No paint layer falling off | ＞1500h |
| Example 9 | Without cracking | No paint layer falling off | ＞1500h |
| Example 10 | Without cracking | No paint layer falling off | ＞1800h |
It can be seen that in the examples 1-10, no cracking occurs under low temperature impact, the adhesion of the paint layer is qualified in the Baige method test, and the salt spray resistance exceeds 1000h, which shows that the part has good matching of formability and low temperature impact resistance, is suitable for low temperature and corrosive climate, and has good service life and safety.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (3)
1. The low-temperature impact resistant instrument case part is characterized by comprising a cold-rolled steel plate or hot-dip galvanized steel plate matrix layer, wherein the matrix layer comprises the following chemical components in percentage by mass: 0.0010-0.0030% of C, 0.15-0.25% of Mn, less than or equal to 0.10% of Si, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.02-0.06% of Als, 0.05-0.09% of Ti, 0.01-0.03% of Nb, 0.0005-0.0020% of B, 0.001-0.003% of N, and the balance of Fe and inevitable impurities, wherein a chemical treatment film layer with the thickness of 0.05-0.2 mu m is formed on the substrate layer, a paint layer with the thickness of 50-100 mu m is formed on the chemical treatment film layer, the chemical treatment film layer comprises organosilane, fluorozirconate and fluorotitanate, the paint layer comprises resin and toughening agent, and the preparation method of the instrument case part with low-temperature impact resistance sequentially comprises the following steps:
s1, the cold-rolled steel plate or the hot-dip galvanized steel plate is processed by stamping, punching, flanging, trimming and welding to form the base layer of the instrument shell part;
s2, degreasing and rinsing the surface of the substrate layer;
s3, performing surface silane treatment on the substrate layer for 1-2min to form the chemical treatment film layer;
s4 rinsing and drying;
s5, performing electrostatic powder spraying on the chemical treatment film layer, and performing electrostatic powder spraying by adopting thermosetting powder coating, wherein the electrostatic powder spraying amount is 75-150 g/m2The thickness of the powder layer is 50-100 mu m;
s6, baking and curing to form the paint coating;
s7 cooling, taking out at room temperature to obtain the finished part.
2. The method for preparing the low-temperature impact resistant instrument case part according to claim 1, wherein in the step S6, the baking is carried out by a gas radiation heating mode, the temperature of the baking furnace is 220-250 ℃, the temperature of the part during baking is 180-220 ℃, and the baking time is 15-20 min.
3. The method for preparing the low-temperature impact resistant instrument case part according to claim 1, wherein in the step S7, air cooling is adopted, and the cooling speed is 5-10 ℃/S.
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