Corrosion protection design method for electric lap joint structure with potential difference

Abstract

The invention relates to a corrosion protection design method for an electric lap joint structure with potential difference, and belongs to the field of helicopters. The method comprises the following steps: polishing and cleaning two contact surfaces with an electric lap joint requirement to remove a high-resistance surface layer; after the two lap joint surfaces are cleaned, conducting resin is immediately coated, and then lap joint installation is carried out; and after lap joint is completed, corner filling sealing or packaging sealing is conducted on the periphery of the joint of the two lap joint faces.

Description

Technical Field

[0001] The invention relates to a corrosion protection design method for an electric overlap structure with a potential difference, and belongs to the field of helicopters. Background Art

[0002] With the continuous development of my country's marine resources, the demand for the application of helicopters in the marine environment has continued to increase. The electric bonding structure with a potential difference is prone to potential corrosion in the marine environment. Before the application of this patented technology, the helicopter electric bonding structure design was sealed, but due to the lack of in-depth research on the sealing shape and size requirements, the sealing isolation effect was not good. Corrosion products began to appear in the fourth cycle of the accelerated corrosion test (corresponding to 4 years of service in conventional waters), and more serious effects on the electric bonding effect began to appear in the fifth cycle.

[0003] Therefore, it is necessary to study the sealing shape, size and post-sealing treatment measures of the electrical overlap structure with potential difference, and screen out the best state that meets the requirements of helicopter use through experiments. Summary of the invention

[0004] Purpose of the invention: To provide a corrosion protection design method for an electric overlap structure with a potential difference, which is used for corrosion protection of electric overlap structures between helicopter structural parts with different substrates, such as copper and aluminum, composite materials and aluminum, structural steel and aluminum. It can improve the corrosion protection ability of electric overlap structures with a potential difference in marine environments and other corrosive environments, and extend maintenance time.

[0005] Technical solution:

[0006] A corrosion protection design method for an electrically bonded structure with a potential difference is provided, comprising:

[0007] Grind and clean the two contact surfaces that require electrical bonding to remove the high-resistance surface layer;

[0008] After cleaning the two overlapping surfaces, apply conductive glue immediately and then perform overlapping installation;

[0009] After the overlap is completed, fillet seal or wrap seal is performed around the joints of the two overlapped surfaces.

[0010] Furthermore, the method further comprises:

[0011] After the sealant reaches the non-stick period, re-seal the surface with the original paint or a paint equivalent to the original paint, or DBLQ6801 green insulating varnish, so that the paint tightly covers the sealant surface in the polished area around the joint to prevent corrosion.

[0012] Furthermore, the overlap of two metal plates with a potential difference is sealed by filling the corners; and the overlap wires and overlap ends with a potential difference are sealed by encapsulation.

[0013] Furthermore, if the thickness of the overlapping upper plate b≤1.2mm, the sealing width w of the lower structure surface is in the range of 4-6mm, and the sealing width a=wb of the upper structure surface; when 1.2mm<b≤3.2mm, the range of w is 6-8mm, and a=wb; when 3.2mm<b≤6.5mm, the range of w is 6-10mm, and a=0; when 6.5mm<b≤10mm, the range of w is 6-10mm, and a=0.

[0014] Further, for the package sealing, the top thickness of the sealing package a1 ranges from 2.5 to 3.5 mm, and the bottom cross-sectional width b1 ranges from 3.0 to 4.0 mm.

[0015] Furthermore, for the board surface, the grinding range exceeds the outer edge of the contact surface by 2 to 3 mm.

[0016] Furthermore, if it is on the catheter, it should exceed the outer edge of the contact surface by 3 to 5 mm.

[0017] Beneficial effects:

[0018] This corrosion protection design method can effectively improve the corrosion protection capability of the helicopter's electrical bonding structure with potential difference in the ocean and other corrosive environments. Under the premise of meticulous construction according to design requirements, it can basically meet the requirement that such structures serve in conventional sea areas for 10 years. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A shape diagram for lap terminal and lap wire terminal package.

[0020] Figure 2 Another shape diagram of the lap terminal and the lap wire terminal package. DETAILED DESCRIPTION

[0021] A corrosion protection design method for an electrically bonded structure with a potential difference is provided, comprising:

[0022] Grind and clean the two contact surfaces that require electrical bonding to remove the high-resistance surface layer;

[0023] After cleaning the two overlapping surfaces, apply conductive glue immediately and then perform overlapping installation;

[0024] After the overlap is completed, fillet or seal the perimeter of the joints of the two overlapped surfaces;

[0025] After the sealant reaches the non-stick period, re-seal the surface with the original paint or a paint equivalent to the original paint, or DBLQ6801 green insulating varnish, so that the paint tightly covers the sealant surface in the polished area around the joint to prevent corrosion.

[0026] Furthermore, the overlap of two metal plates with a potential difference is sealed by filling the corners; and the overlap wires and overlap ends with a potential difference are sealed by encapsulation.

[0027] Furthermore, if the thickness of the overlapping upper plate b≤1.2mm, the sealing width w of the lower structure surface is in the range of 4-6mm, and the sealing width a=wb of the upper structure surface; when 1.2mm<b≤3.2mm, the range of w is 6-8mm, and a=wb; when 3.2mm<b≤6.5mm, the range of w is 6-10mm, and a=0; when 6.5mm<b≤10mm, the range of w is 6-10mm, and a=0.

[0028] Further, for the package sealing, the top thickness of the sealing package a1 ranges from 2.5 to 3.5 mm, and the bottom cross-sectional width b1 ranges from 3.0 to 4.0 mm.

[0029] Furthermore, for the board surface, the grinding range exceeds the outer edge of the contact surface by 2 to 3 mm.

[0030] Furthermore, if it is on the catheter, it should exceed the outer edge of the contact surface by 3 to 5 mm.

[0031] The main working contents and processes of the present invention are as follows

[0032] 1. Grind and clean the contact surface that needs electrical bonding to remove the paint layer, oxide layer, grease and other high-resistance surface layers on the contact surface. The grinding range should exceed the outer edge of the contact surface by 2 to 3 mm. If it is on the conduit, it should exceed 3 to 5 mm.

[0033] 2. After cleaning the two overlapping surfaces, immediately apply conductive glue and then perform overlapping installation; the conductive glue should be CHO-BOND1038, DAD-8-3 or other conductive glue with equivalent performance.

[0034] 3. After the overlap is completed, the surrounding area should be filled and sealed or sealed; sealing materials such as HM109, HM119, HM317, etc. can be used for sealing.

[0035] 4. The shape and size of the electrical overlap fillet seal with potential difference are shown in Table 1;

[0036] Table 1 Electrical lap fillet sealing shape and size requirements

[0037]

[0038]

[0039] 5. The sealing shape and size of the electrical connection terminal with potential difference and the connection wire package are shown in Figure 1-2 and Table 2;

[0040] Table 2 Requirements for lap joint terminal package dimensions

[0041]

[0042] 6. After the sealant reaches the non-stick period, the original paint or an equivalent paint, or DBLQ6801 green insulating varnish, must be used to re-seal the surface so that the paint tightly covers the sealant surface in the polished area around the joint to prevent corrosion.

Claims

1. A corrosion protection design method for an electrical overlap structure with a potential difference, characterized in that: include: Grind and clean the two contact surfaces that require electrical bonding to remove the high-resistance surface layer; After cleaning the two overlapping surfaces, apply conductive glue immediately and then perform overlapping installation; After the overlap is completed, fillet seal or wrap seal is performed around the joints of the two overlapped surfaces.

2. The method according to claim 1, characterized in that The method further comprises: After the sealant reaches the non-stick period, re-seal the surface with the original paint or a paint equivalent to the original paint, or DBLQ6801 green insulating varnish, so that the paint tightly covers the sealant surface in the polished area around the joint to prevent corrosion.

3. The method according to claim 2, characterized in that The overlap of two metal plates with potential difference is sealed by filling corners; the overlap wires and overlap ends with potential difference are sealed by encapsulation.

4. The method according to claim 3, characterized in that If the thickness of the overlapping upper plate b≤1.2mm, the sealing width w of the lower structure surface is in the range of 4-6mm, and the sealing width a=wb of the upper structure surface; when 1.2mm<b≤3.2mm, the range of w is 6-8mm, and a=wb; when 3.2mm<b≤6.5mm, the range of w is 6-10mm, and a=0; when 6.5mm<b≤10mm, the range of w is 6-10mm, and a=0.

5. The method according to claim 3, characterized in that: For the package sealing, the top thickness of the sealing package a1 ranges from 2.5 to 3.5 mm, and the bottom section width b1 ranges from 3.0 to 4.0 mm.

6. The method according to claim 1, characterized in that For the board surface, the grinding range exceeds the outer edge of the contact surface by 2 to 3 mm.

7. The method according to claim 1, characterized in that If it is on the catheter, it should extend 3 to 5 mm beyond the outer edge of the contact surface.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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