Corrosion prevention method for covering edge of truck door

Abstract

The invention relates to a process method for preventing corrosion of a covered edge of a truck door, which solves the technical problem of corrosion of the covered edge of the truck door and improves the corrosion resistance of the truck door. The automobile door inner plate and the automobile door outer plate are formed by common deep-drawn steel plates; the method comprises the following steps: (1) coating zinc-rich primer between the inner side of an outer plate flange and the upper side of an inner plate edge and between the lower side of the outer plate edge and the lower side of the inner plate edge; (2) edge folding glue is evenly smeared on the edge fracture of the inner plate on the inner side of the edge folding line; (3) edge covering treatment; (4) the automobile door inner plate and the automobile door outer plate are connected through a resistance spot welding technology; (5) the vehicle door is dried after electrophoresis, and PVC sealant coating is conducted on the edge fracture position of the vehicle door wrapping edge outer plate; and (6) after drying, sealing wax treatment is conducted on the position, prone to water accumulation, of the automobile door. Compared with the mode that both the automobile door inner plate and the automobile door outer plate are made of galvanized plates, the cost is low; the anti-corrosion reliability of the automobile door used for a long time in a wet and cold area is improved, and the method can be popularized and applied to all technological methods for driving cabs with edge covering structural components.

Description

Technical Field

[0001] This invention belongs to the field of vehicle body-in-white door anti-corrosion technology, specifically relating to a method for edge-wrapping anti-corrosion of truck doors. Background Technology

[0002] Currently, domestic truck doors are formed using ordinary deep-drawn steel sheets. The outer door panel is placed on a fixture and fixed. Folding adhesive is applied to the inside of the folded edges of the outer door panel. Then, the inner door panel is placed onto the outer door panel to form an assembly. The assembly of the inner and outer door panels is then edge-wrapped and connected using spot welding. After electrophoresis and drying, the edges of the door body-in-white are coated with PVC. (See...) Figure 1 During the electrophoresis process, electromagnetic shielding occurs inside the door edging, preventing the electrophoretic paint from adhering to the steel plate inside the stamped part's edging. Subsequent use of the vehicle in humid and cold regions resulted in internal rusting of the edging, with yellowish-brown rust spots appearing along the edges. Summary of the Invention

[0003] This invention provides a process for corrosion protection of truck door edging, which solves the technical problem of rust at the edging of truck doors and improves the corrosion resistance of vehicle doors.

[0004] This invention is achieved through the following technical solutions:

[0005] A method for corrosion protection of truck door edging includes the following steps;

[0006] 1) The inner door panel 8 and the outer door panel 7 are formed from ordinary deep-drawing steel sheets;

[0007] 2) Place the outer door panel 7 onto the clamp and fix it. Apply zinc-rich primer 10 with a brush between the inner edge 2 of the outer panel, the upper edge 3 of the inner panel, and the lower edge 5 of the outer panel and the lower edge 6 of the inner panel. The ambient temperature should be greater than 20℃ and the surface drying time should be greater than 300 seconds. The application area should be well ventilated and there should be no open flame within 10m.

[0008] 3) Place the inner door panel 8 onto the outer door panel 7 to form an assembly. Apply folding adhesive 11 evenly to the inner edge of the inner panel on the inside of the folding line. The diameter of the folding adhesive is 2.5-3.5mm, and the distance from the rounded corner is 4.5-5.5mm.

[0009] 4) The inner door panel 8 and the outer door panel 7 are joined together and the edges are bound. Use a cloth to wipe away any excess adhesive from the edges.

[0010] 5) Place the assembled inner door panel 8 and outer door panel 7 into the fixture, and connect the inner door panel 8 and outer door panel 7 using resistance spot welding.

[0011] 6) After the body-in-white doors are electrophoretically treated and dried, PVC sealant 9 is applied to the broken edge 1 of the outer panel of the door edging.

[0012] 7) After drying, apply sealant wax 12 to the areas of the car door where water tends to accumulate.

[0013] Compared to using galvanized steel sheets for both the inner and outer door panels, this invention performs this process on only a portion of the door, resulting in lower costs. It also improves the corrosion resistance of the door during long-term use in humid and cold regions and can be applied to all cab components with edge-sealing structures. Attached Figure Description

[0014] Figure 1 A schematic diagram of the structure of the door edging area;

[0015] Figure 2 This is a schematic diagram showing the distribution of materials used in the door edging process. Detailed Implementation

[0016] like Figure 1 and Figure 2 As shown, this invention provides a process for corrosion protection of truck door edging. A zinc-rich primer is applied to the inner edging area of ​​the door to increase the protective layer of the paint film. Simultaneously, PVC sealant and sealing wax are applied to eliminate the electrochemical corrosion environment at the edging area, thereby improving the corrosion resistance of the door edging area. The process includes the following steps:

[0017] 1. The inner door panel 8 and the outer door panel 7 are made of ordinary deep-drawing steel sheet;

[0018] 2. Place the outer door panel 7 onto the clamp and fix it. Apply zinc-rich primer 10 with a brush between the inner edge 2 of the outer panel and the upper edge 3 of the inner panel, and between the lower edge 5 of the outer panel and the lower edge 6 of the inner panel. The ambient temperature should be greater than 20℃ and the surface drying time should be greater than 300 seconds. The application area should be well ventilated and there should be no open flame within 10m.

[0019] 3. Place the inner door panel 8 onto the outer door panel 7 to form an assembly. Apply folding adhesive 11 evenly to the inner edge of the inner panel cut 4 inside the folding line. The diameter of the folding adhesive is 2.5-3.5mm, and the distance from the rounded corner is 4.5-5.5mm.

[0020] 4. The inner door panel 8 and the outer door panel 7 are joined together and edge-wrapped. Use a cloth to wipe away any excess adhesive from the edges.

[0021] 5. Place the assembled inner door panel 8 and outer door panel 7 into the fixture, and connect the inner door panel 8 and outer door panel 7 using resistance spot welding.

[0022] 6. After the white body door is dried after electrophoresis, PVC sealant 9 is applied to the broken edge 1 of the outer panel of the door edge.

[0023] 7. After drying, apply sealant wax 12 to areas of the car door that are prone to water accumulation.

[0024] Compared to using galvanized steel sheets for both the inner and outer door panels, this invention performs this process on only a portion of the door, resulting in lower costs. It also improves the corrosion resistance of the door during long-term use in humid and cold regions and can be applied to all cab components with edge-sealing structures.

[0025] This invention prevents air and rainwater from entering the door edging area, thus eliminating rust in the door edging area.

[0026] The incentive improved the corrosion resistance of the door edging area.

[0027] This invention is easy to operate in actual production and can effectively eliminate rust on the door edging.

Claims

1. A method for corrosion protection of truck door edging, characterized in that: Includes the following steps; 1) The inner door panel (8) and the outer door panel (7) are formed from ordinary deep-drawing steel plates; 2) Place the outer door panel (7) onto the clamp and fix it. Apply zinc-rich primer (10) between the inner edge (2) of the outer panel, the upper edge (3) of the inner panel, the lower edge (5) of the outer panel, and the lower edge (6) of the inner panel using a brush. 3) Place the inner door panel (8) onto the outer door panel (7) to form a complete assembly, and apply folding adhesive (11) evenly to the inner door panel edge break (4) inside the folding line; 4) The inner door panel (8) and the outer door panel (7) are joined together and the excess adhesive is wiped clean. 5) Place the assembly of the inner door panel (8) and the outer door panel (7) into the fixture, and connect the inner door panel (8) and the outer door panel (7) using resistance spot welding. 6) After the white body door is electrophoretically dried, PVC sealant (9) is applied to the broken edge (1) of the outer panel of the door edge; 7) After drying, apply sealing wax (12) to the areas of the car door where water is likely to accumulate.

2. The method for corrosion protection of truck door edging according to claim 1, characterized in that: When applying zinc-rich primer (10), the ambient temperature is greater than 20°C and the surface drying time is greater than 300 seconds.

3. The method for corrosion protection of truck door edging according to claim 1, characterized in that: When applying zinc-rich primer (10), the area to be applied should be well ventilated and there should be no open flames within 10m around it.

4. The method for corrosion protection of truck door edging according to claim 1, characterized in that: When applying the edge-folding adhesive (11), the diameter of the adhesive should be 2.5-3.5mm and the distance from the rounded corner should be 4.5-5.5mm.

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