THERMOFORMED COMPONENT HAVING EXCELLENT COATING ADHESION, AND MANUFACTURING METHOD THEREFOR

Abstract

Disclosed are thermoformed component having excellent coating adhesion and a method for manufacturing the same. The thermoformed component comprises a substrate layer and an aluminum coating coated on at least one surface of the substrate layer, wherein the average roughness Ra of a surface of the thermoformed component is between 1.0 μm and 3.0 μm, the peak height and the peak-to-valley height Rt are between 8 μm and 30 μm, and the roughness peak count Rpc is greater than or equal to 50. The thermoformed component has good paintability, good coating adhesion and good corrosion resistance, and is very suitable for automotive parts.

Claims

1. A thermoformed component having excellent coating adhesion, comprising a substrate layer and an aluminum coating coated on at least one surface of the substrate layer, wherein the average roughness Ra of a surface of the thermoformed component is 1.0˜3.0 μm, the peak-to-valley height Rt is 8˜30 μm, and the roughness peak count Rpc is ≥50.

2. The thermoformed component having excellent coating adhesion according to claim 1, wherein the aluminum coating comprises a diffusion layer adjacent to the substrate layer and an alloy layer on the surface of the aluminum coating, wherein the ratio of the thickness of the diffusion layer to the total thickness of the aluminum coating is 0.08-0.5.

3. The thermoformed component having excellent coating adhesion according to claim 1, wherein the thickness of the diffusion layer is ≤16 μm, and the total thickness of the aluminum coating is ≤60 μm.

4. The thermoformed component having excellent coating adhesion according to claim 1, wherein the mass percentage of chemical elements of the aluminum coating is: Si: 4˜14%, Fe: 0˜4%, Mg: 0˜10%, Zn: 0˜20%, and a balance of Al and other unavoidable impurities.

5. The thermoformed component having excellent coating adhesion according to claim 1, wherein the average weight of the aluminum coating is 20˜120 g/m.sup.2 per single surface.

6. The thermoformed component having excellent coating adhesion according to claim 5, wherein the average weight of the aluminum coating is 30˜100 g/m.sup.2 per single surface.

7. The thermoformed component having excellent coating adhesion according to claim 1, wherein the mass percentage of chemical elements of the substrate layer is: C: 0.01˜0.8%, Si: 0.05˜1.0%, Mn: 0.1˜5%, P≤0.3%, S0.1%, Al≤0.3%, Ti≤0.5%, B: 0.0005˜0.1%, Cr: 0.01˜3%, Nb≤0.5%, V≤0.5%, and a balance of Fe and other unavoidable impurities.

8. The thermoformed component having excellent coating adhesion according to claim 7, wherein the mass percentage of chemical elements of the substrate layer further meets at least one of the following: C: 0.05˜0.6%, Si: 0.07˜0.8%, Mn: 0.3˜4%, P≤0.2%, S≤0.08%, A≤0.2%, Ti≤0.4%, B: 0.0005˜0.08%, Cr: 0.01˜2%, Nb≤0.3%, V≤0.3%.

9. The thermoformed component having excellent coating adhesion according to claim 7, wherein the mass percentage of chemical elements of the substrate layer further meets at least one of the following: C: 0.15˜0.5%, Si: 0.1˜0.5%, Mn: 0.5˜3%, P≤0.1%, S≤0.05%, A≤0.1%, Ti≤0.2%, Cr: 0.01˜1%.

10. The thermoformed component having excellent coating adhesion according to claim 1, wherein the yield strength of the thermoformed component having excellent coating adhesion is 400˜1400 MPa, the tensile strength is 500˜2100 MPa, and the elongation is ≥4%.

11. The thermoformed component having excellent coating adhesion according to claim 1, wherein the surface of the thermoformed component having excellent coating adhesion comprises Fe.sub.2Al.sub.5 and FeAl alloy; or the surface of the thermoformed component having excellent coating adhesion mainly consists of Fe.sub.2Al.sub.5 and FeAl alloy, and further comprises silicon oxide, aluminum oxide and iron oxide.

12. The thermoformed component having excellent coating adhesion according to claim 9, wherein the volume percentage of martensite in the microstructure of the substrate layer of the thermoformed component having excellent coating adhesion is 95%.

13. A manufacturing method for the thermoformed component having excellent coating adhesion of claim 1, comprising the following steps: (1) immersing a substrate in an aluminum coating solution to obtain a plate having an aluminum coating on a surface thereof; (2) leveling: using a leveling roller having a roughness Ra of 0.5˜3.0 μm to level the plate, and controlling the leveling elongation ≤2.0%, wherein the surface thermal radiation coefficient of the plate is 0.1˜0.8, the surface roughness Ra of the plate is 0.3˜2.0 μm, and the peak roughness count RPC of the surface of the plate is 30˜150; (3) blanking: performing blanking on the plate or cutting the plate to obtain a blank having a required component shape; (4) heat treatment: putting the blank into a heating furnace for heating and heat preservation, wherein the temperature of the heating furnace is 880˜960° C., the atmosphere in the heating furnace is air or nitrogen, and the residence time of the blank in the heating furnace is 2.5˜10 min; (5) transferring and hot stamping: quickly transferring the heated blank to a mold for cooling and stamping forming to form the thermoformed component.

14. The manufacturing method according to claim 13, wherein in step (1), the mass percentage of chemical elements of the aluminum coating solution is: Si: 5˜11%, Fe: 2˜4%, Zn: 0˜15%, Mg: 0˜8%, and a balance of Al and other unavoidable impurities.

15. The manufacturing method according to claim 13, wherein in step (4), during the heating up process of blank heating, the heating rate does not exceed 10° C./s in the range of heating up to 400˜600° C.

16. The manufacturing method according to claim 13, wherein in step (5), the blank is transferred to the mold within 20 seconds; or after the mold is closed, a pressure holding quenching is continued for 4˜20 s, and the pressure holding pressure applied to the blank surface is ≥8 MPa; or the closing speed of the mold during stamping is 30˜150 mm/s; or the blank is cooled to 50˜200° C. at a cooling rate of 30˜150° C./s.

17. (canceled)

18. The manufacturing method according to claim 13, wherein the material of the mold meets the following requirement: the thermal diffusion coefficient at 700° C. is greater than 3.8 mm.sup.2/s.

19.-20. (canceled)

21. The manufacturing method according to claim 13, wherein the mass percentage of chemical elements of the substrate layer is: C: 0.01˜0.8%, Si: 0.05˜1.0%, Mn: 0.1˜5%, P≤0.3%, S≤0.1%, Al≤0.3%, Ti≤0.5%, B: 0.0005˜0.1%, Cr: 0.01˜3%, Nb≤0.5%, V≤0.5%, and a balance of Fe and other unavoidable impurities.

22. The manufacturing method according to claim 13, wherein the aluminum coating comprises a diffusion layer adjacent to the substrate layer and an alloy layer on the surface of the aluminum coating, wherein the ratio of the thickness of the diffusion layer to the total thickness of the aluminum coating is 0.08-0.5.

23. The thermoformed component having excellent coating adhesion according to claim 4, wherein the mass percentage of chemical elements of the aluminum coating is: Si: 4˜14%, Fe: 2˜4%, Mg: 0˜10%, Zn: 0˜20%, and a balance of Al and other unavoidable impurities.

Description

DETAILED DESCRIPTION

[0072] The thermoformed component having excellent coating adhesion of the present disclosure and its manufacturing method will be further explained and illustrated with reference to specific examples. Nonetheless, the explanation and illustration are not intended to unduly limit the technical solution of the present disclosure.

Examples 1-10 and Comparative Example 1

[0073] The thermoformed components having excellent coating adhesion of Examples 1-10 and Comparative Example 1 are manufactured by the following step:

[0074] (1) Immersing a substrate in an aluminum coating solution to obtain a plate having an aluminum coating on a surface thereof.

[0075] (2) Leveling: using a leveling roller having a roughness Ra of 0.5˜3.0 μm to level the plate, and controlling the leveling elongation ≤2.0%, so that the surface thermal radiation coefficient of the plate was 0.1˜0.8, the surface roughness Ra of the plate was 0.3˜2.0 μm, and the peak roughness count Rpc of the surface of the plate was 30˜150.

[0076] (3) Blanking: performing blanking on the plate or cutting the plate to obtain a blank having a required component shape;

[0077] (4) Heat treatment: putting the blank into a heating furnace for heating and heat preservation, wherein the temperature of the heating furnace was 880˜960° C., the atmosphere in the heating furnace was air or nitrogen, the residence time of the blank in the heating furnace was 2.5∫10 min, and during the heating up process of blank heating, the heating rate did not exceed 10° C./s in the range of heating up to 400˜600° C.

[0078] (5) Transferring and hot stamping: quickly (such as within 20 seconds) transferring the heated blank to a mold for cooling and stamping forming to form a thermoformed component. Wherein, in the hot stamping process, after the mold was closed, a pressure holding quenching was continued for 4˜20 s, the pressure holding pressure applied to the blank surface was ≥8 MPa, and the material of the mold met the following requirement: the thermal diffusion coefficient at 700° C. was greater than 3.8 mm.sup.2/s, and during stamping, the closing speed of the mold was 30˜150 mm/s, and the blank was cooled to 50˜200° C. at a cooling rate of 30˜150° C./s.

[0079] Wherein, the manufacturing methods of every Examples and Comparative Example are as follows:

Example 1

[0080] A 1.2 mm steel plate with aluminum alloy coating was leveled by a leveling roller to obtain a plate before heat treatment and hot stamping having a surface roughness as shown in Table 2, and the plate was laser blanked into a blank with a certain size and shape. The mass percentage of chemical compositions of the aluminum coating solution was Si: 8.5%, Fe: 2.6%, Zn: 15%, Mg: 4%, and a balance of Al and other unavoidable impurities. The blank entered a heating furnace. The temperature of the heating furnace was 950° C., the residence time was 3.5 minutes, the heating rate was 2° C./s in the range of 400˜600° C., the transferring time was 4 seconds, the pressure holding time was 5 seconds, the pressure holding pressure was 10 MPa, the mold closing speed was 50 mm/s, the cooling speed was 50° C./s, the finish temperature of cooling was 200° C. and the thermal diffusion coefficient of the mold at 700° C. was 4 mm.sup.2/s.

Example 2

[0081] A 0.9 mm steel plate with aluminum alloy coating was leveled by a leveling roller to obtain a plate before heat treatment and hot stamping having a surface roughness as shown in Table 2, and the plate was laser blanked into a blank with a certain size and shape. The mass percentage of chemical compositions of the aluminum coating solution was Si: 5%, Fe: 2.4%, Zn: 8%, Mg: 8%, and a balance of Al and other unavoidable impurities. The blank entered a heating furnace. The temperature of the heating furnace was 940° C., the residence time was 5 minutes, the heating rate was 5° C./s in the range of 400˜600° C., the transferring time was 6 seconds, the pressure holding time was 15 seconds, the pressure holding pressure was 20 MPa, the mold closing speed was 150 mm/s, the cooling speed was 150° C./s, the finish temperature of cooling was 50° C. and the thermal diffusion coefficient of the mold at 700° C. was 5 mm.sup.2/s.

Example 3

[0082] A 1.0 mm steel plate with aluminum alloy coating was leveled by a leveling roller to obtain a plate before heat treatment and hot stamping having a surface roughness as shown in Table 2, and the plate was laser blanked into a blank with a certain size and shape. The mass percentage of chemical compositions of the aluminum coating solution was Si: 9.0%, Fe: 2.7%, and a balance of Al and other unavoidable impurities. The blank entered a heating furnace. The heating rate of 400˜600° C. was 5° C./s, the temperature of the heating furnace was 930° C., the residence time was 7 minutes, the heated blank was transferred to a mold within 8 seconds, and the thermal diffusion coefficient of the mold at 700° C. was 7 mm.sup.2/s. The mold closing speed was 70 mm/s, the pressure holding time was 6 seconds, the pressure holding pressure was 12 MPa, the cooling speed was 100° C./s, and the finish temperature of cooling was 100° C. The proportion of martensite in the microstructure of the substrate of the thermoformed component is higher than 96%.

Example 4

[0083] A 2.8 mm steel plate with aluminum alloy coating was leveled by a leveling roller to obtain a plate before heat treatment and hot stamping having a surface roughness as shown in Table 2, and the plate was laser blanked into a blank with a certain size and shape. The mass percentage of chemical compositions of the aluminum coating solution was Si: 8.8%, Fe: 2.7%, and a balance of Al and other unavoidable impurities. The blank entered a heating furnace. The temperature of the heating furnace was 920° C., the residence time was 7 minutes, the heating rate of 400˜600° C. was 10° C./s, the heated blank was transferred to a mold within 8 seconds, the mold closing speed was 70 mm/s, the pressure holding time was 6 seconds, the pressure holding pressure was 15 MPa, the cooling speed was 60° C./s, the finish temperature of cooling was 60° C. and the thermal diffusion coefficient of the mold at 700° C. was 6 mm.sup.2/s. The proportion of martensite in the microstructure of the substrate of the thermoformed component is higher than 98%.

Example 5

[0084] A 1.1 mm steel plate with aluminum alloy coating was leveled by a leveling roller to obtain a plate before heat treatment and hot stamping having a surface roughness as shown in Table 2, and the plate was laser blanked into a blank with a certain size and shape. The mass percentage of chemical compositions of the aluminum coating solution was Si: 10%, Fe: 3.5%, Zn: 2%, Mg: 1%, and a balance of Al and other unavoidable impurities. The blank entered a heating furnace. The temperature of the heating furnace was 935° C., the residence time was 4.5 minutes, the heating rate was 4° C./s in the range of 400˜600° C., the heated blank was transferred to a mold within 7 seconds, the mold closing speed of upper and lower molds was 80 mm/s, the pressure holding time was 5 seconds, the pressure holding pressure was 15 MPa, the thermal diffusion coefficient of the mold at 700° C. was 4 mm.sup.2/s and the finish temperature of cooling was 100° C. The proportion of martensite in the microstructure of the substrate of the thermoformed component is higher than 95%.

Example 6

[0085] A 1.5 mm steel plate with aluminum alloy coating was leveled by a leveling roller to obtain a plate before heat treatment and hot stamping having a surface roughness as shown in Table 2, and the plate was laser blanked into a blank with a certain size and shape. The mass percentage of chemical compositions of the aluminum coating solution was Si: 10%, Fe: 3.5%, Mg: 0.5%, and a balance of Al and other unavoidable impurities. The blank entered a heating furnace. The temperature of the heating furnace was 935° C., the residence time was 5 minutes, the heating rate was 6° C./s in the range of 400˜600° C., the heated blank was transferred to a mold within 7 seconds, the mold closing speed of upper and lower molds was 80 mm/s, the pressure holding time was 5 seconds, the pressure holding pressure was 15 MPa, the thermal diffusion coefficient of the mold at 700° C. was 4 mm.sup.2/s and the finish temperature of cooling was 120° C. The proportion of martensite in the microstructure of the substrate of the thermoformed component is higher than 95%.

Example 7

[0086] A 1.8 mm steel plate with aluminum alloy coating was leveled by a leveling roller to obtain a plate before heat treatment and hot stamping having a surface roughness as shown in Table 2, and the plate was laser blanked into a blank with a certain size and shape. The mass percentage of chemical compositions of the aluminum coating solution was Si: 10%, Fe: 3.5%, and a balance of Al and other unavoidable impurities. The blank entered a heating furnace. The temperature of the heating furnace was 945° C., the residence time was 2.5 minutes, the heating rate was 7° C./s in the range of 400˜600° C., the heated blank was transferred to a mold within 7 seconds, the mold closing speed of upper and lower molds was 80 mm/s, the pressure holding time was 5 seconds, the pressure holding pressure was 15 MPa, the thermal diffusion coefficient of the mold at 700° C. was 6.8 mm.sup.2/s and the finish temperature of cooling was 140° C. The proportion of martensite in the microstructure of the substrate of the thermoformed component is higher than 95%.

Example 8

[0087] A 2.0 mm steel plate with aluminum alloy coating was leveled by a leveling roller to obtain a plate before heat treatment and hot stamping having a surface roughness as shown in Table 2, and the plate was laser blanked into a blank with a certain size and shape. The mass percentage of chemical compositions of the aluminum coating solution was Si: 10%, Fe: 3.5%, and a balance of Al and other unavoidable impurities. The blank entered a heating furnace. The temperature of the heating furnace was 940° C., the residence time was 3 minutes, the heating rate was 3° C./s in the range of 400˜600° C., the oxygen content of the atmosphere in the furnace was 22%, the heated blank was transferred to a mold within 7 seconds, the mold closing speed of upper and lower molds was 80 mm/s, the pressure holding time was 5 seconds, the pressure holding pressure was 15 MPa, the thermal diffusion coefficient of the mold at 700° C. was 7 mm.sup.2/s and the finish temperature of cooling was 110° C. The proportion of martensite in the microstructure of the substrate of the thermoformed component is higher than 95%.

Example 9

[0088] A 2.4 mm steel plate with aluminum alloy coating was leveled by a leveling roller to obtain a plate before heat treatment and hot stamping having a surface roughness as shown in Table 2, and the plate was laser blanked into a blank with a certain size and shape. The mass percentage of chemical compositions of the aluminum coating solution was Si: 10%, Fe: 3.5%, and a balance of Al and other unavoidable impurities. The blank entered a heating furnace. The temperature of the heating furnace was 935° C., the residence time was 5 minutes, the heating rate was 8° C./s in the range of 400˜600° C., the oxygen content of the atmosphere in the furnace was 22%, the heated blank was transferred to a mold within 7 seconds, the mold closing speed of upper and lower molds was 80 mm/s, the pressure holding time was 5 seconds, the pressure holding pressure was 15 MPa, the thermal diffusion coefficient of the mold at 700° C. was 4 mm.sup.2/s and the finish temperature of cooling was 100° C. The proportion of martensite in the microstructure of the substrate of the thermoformed component is higher than 95%.

Example 10

[0089] A 2.8 mm steel plate with aluminum alloy coating was leveled by a leveling roller to obtain a plate before heat treatment and hot stamping having a surface roughness as shown in Table 2, and the plate was laser blanked into a blank with a certain size and shape. The mass percentage of chemical compositions of the aluminum coating solution was Si: 10%, Fe: 3.5%, and a balance of Al and other unavoidable impurities. The blank entered a heating furnace. The temperature of the heating furnace was 950° C., the residence time was 2.5 minutes, the heating rate was 4° C./s in the range of 400˜600° C., the oxygen content of the atmosphere in the furnace was 20%, the heated blank was transferred to a mold within 15 seconds, the mold closing speed of upper and lower molds was 80 mm/s, the pressure holding time was 5 seconds, the pressure holding pressure was 15 MPa, the thermal diffusion coefficient of the mold at 700° C. was 5 mm.sup.2/s and the finish temperature of cooling was 80° C. The proportion of martensite in the microstructure of the substrate of the thermoformed component is higher than 95%.

Comparative Example 1

[0090] A 1.5 mm steel plate with aluminum alloy coating was leveled by a leveling roller to obtain a plate before heat treatment and hot stamping having a surface roughness as shown in Table 2, and the plate was laser blanked into a blank with a certain size and shape. The mass percentage of chemical compositions of the aluminum coating solution was Si: 10%, Fe: 3.5%, and a balance of Al and other unavoidable impurities. The blank entered a heating furnace. The temperature of the heating furnace was 935° C., the residence time was 5 minutes, the heating rate was 6° C./s in the range of 400˜600° C., the heated blank was transferred to a mold within 7 seconds, the mold closing speed of upper and lower molds was 80 mm/s, the pressure holding time was 5 seconds, the pressure holding pressure was 15 MPa, the thermal diffusion coefficient of the mold at 700° C. was 4 mm.sup.2/s and the finish temperature of cooling was 120° C. The proportion of martensite in the microstructure of the substrate of the thermoformed component is higher than 95%.

[0091] Table 1 lists the mass percentage ratio of each chemical element of the substrate layers of the thermoformed components having excellent coating adhesion of Examples 1-10 and the substrate layer of Comparative Example 1.

TABLE-US-00001 TABLE 1 (wt %, and a balance of Fe and other unavoidable impurities) Example C Si Mn P S Al Ti B Cr Nb V 1 0.02 0.05 0.12 0.059 0.038 0.09 0.090 0.0005 0.15 — — 2 0.06 0.23 1.19 0.015 0.001 0.04 0.030 0.040 0.27 — — 3 0.49 0.50 2.51 0.024 0.04 0.08 0.027 0.0052 0.51 0.002 0.002 4 0.39 0.36 3.00 0.044 0.03 0.07 0.05 0.0062 0.71 0.003 0.005 5 0.78 0.48 0.50 0.081 0.02 0.05 0.48 0.0071 0.20 0.1 — 6 0.15 0.10 2.90 0.059 0.038 0.09 0.090 0.0031 0.15 — — 7 0.25 0.23 1.19 0.015 0.001 0.04 0.030 0.0040 0.27 — — 8 0.49 0.50 2.51 0.024 0.04 0.08 0.027 0.0052 0.51 0.005 0.008 9 0.39 0.36 3.00 0.044 0.03 0.07 0.05 0.0062 0.71 — — 10 0.50 0.9 0.50 0.081 0.02 0.05 0.20 0.09 0.20 — — Comparative 0.25 0.23 1.19 0.015 0.001 0.04 0.030 0.0040 0.27 — — Example 1

[0092] To verify the application effect of the present disclosure and prove the components having excellent coating adhesion of Examples 1-10 and the comparative thermoformed component of Comparative Example 1 were tested in the present disclosure. Table 2 lists the test results of every Examples and Comparative Example.

TABLE-US-00002 TABLE 2 Comparative Example 1 2 3 4 5 6 7 8 9 10 Example 1 Average weight of aluminum coating, g/m.sup.2 per 23 30 50 60 100 70 80 85 80 75 75 surface Thickness, mm 1.2 0.9 1 2.8 1.1 1.5 1.8 2 2.4 2.8 1.5 Leveling elongation/% 0.5 0.8 1.5 0.3 0.6 0.7 1 1.2 1.8 2 0.7 Roughness of leveling roller/μm 0.5 1.2 3 1 1.5 1.5 1.8 1.2 1.9 2.8 Roughness of plate before heat Ra/μm 0.3 0.8 2 0.9 1.3 1 1.1 0.8 0.7 1.5 0.2 treatment and hot stamping Rpc 50 90 150 90 50 100 70 130 90 80 25 Roughness of finished product Ra/μm 1.8 1.8 1.9 2 2.3 2 1.9 1.9 1.8 2.4 1.3 after heat treatment and hot Rt/μm 12 13 18 19 20 21 18 19 19 22 9 stamping Rpc 90 100 120 120 160 170 150 160 140 170 40 Thickness of 50% Al layer in alloy layer/μm 15 18 20 25 35 26 20 28 26 20 20 Thickness of diffusion layer/μm 5 6 7 8 16 10 8 8 8 8 8 Thickness of total aluminum coating/μm 22 25 30 33 60 40 35 40 38 30 30 Tensile strength of product after 500 700 1820 2000 1900 1000 1550 1590 1600 1580 1500 stamping/MPa Yield strength of product after stamping/MPa 400 500 1250 1350 1200 1050 1000 980 1100 1100 1100 Elongation/% 19 15 5 4 4.5 6 7 6 6 6 6 Paintability The surface of the coating is uniform after pretreatment Nonuniform Coating adhesion after coating Grade Grade Grade Grade Grade Grade Grade Grade Grade Grade Grade 5 1 1 2 2 1 1 2 1 2 1 Corrosion resistance, mm 1 1.5 3 3.5 2 2.3 3.5 3 3.8 3 5 *Test method for coating adhesion:

[0093] Referring to GB/T 9286-1998 cross cut test method, cutting grids on the surface with a knife, sticking an adhesive tape to the center of the formed grids, then pulling it off smoothly, observing the phenomenon of coating falling off, and judging the grade by calculating the state of grids according to the standard.

[0094] The paintability was evaluated with reference to GMW16170 standard.

[0095] The corrosion resistance was tested with reference to GMW14872.

[0096] As can be seen from Table 2, the yield strength of each example of the present disclosure is 400˜1350 MPa, the tensile strength is 500˜2000 MPa, and the elongation is 4˜19%.

[0097] In addition, it can be seen from Table 2 that the surface roughness Ra of the finished product of the comparative thermoformed component of Comparative Example 1 after hot stamping is lower than 1.8 μm, Rt is less than 12 μm, Rpc is lower than 90, and the paintability of the thermoformed component of Comparative Example 1 is poor, the coating adhesion does not meet the requirements, and its performance is far inferior to that of the thermoformed components of every Examples of the present disclosure. In addition, it can be seen from table 2 that the higher the surface roughness of the material before heat treatment and hot stamping used by the thermoformed component, the higher the product roughness after heat treatment and hot stamping, and the better the coating adhesion.

[0098] To sum up, the thermoformed component having excellent coating adhesion of the present disclosure has good paintability, good coating adhesion and good corrosion resistance, and is very suitable for automotive parts, such as front and rear doors, left and right anti-collision rods/beams, front and rear bumpers, A-pillar reinforcing plates, B-pillar reinforcing plates, floor middle channels, etc.

[0099] In addition, the manufacturing method of the present disclosure also has the above advantages and beneficial effects.

[0100] It should be noted that the prior art part of the protection scope of the present disclosure is not limited to the embodiments given in the present disclosure, and all prior technologies that do not conflict with the solution of the present disclosure, including but not limited to prior patent documents, prior public publications, prior public use, etc., can be included in the protection scope of the present disclosure.

[0101] In addition, the combination mode of the technical features in the present disclosure is not limited to the combination mode recorded in the claims or the combination mode recorded in the specific embodiment of the present disclosure. All the technical features recorded in present disclosure can be combined or integrated in any way, unless there is a contradiction between them.

[0102] It should also be noted that the examples listed above are only specific examples of the present disclosure. Obviously, the present disclosure is not limited to the above examples, and the subsequent similar changes or deformations can be directly obtained or easily thought of by those skilled in the art from the contents disclosed in the present disclosure, which should belong to the protection scope of the present disclosure.