Heterogeneous metal joining member excellent in corrosion resistance and process for preparing same
A manufacturing method and technology for dissimilar metals, which are applied to dissimilar metal joining components and manufacturing fields with excellent corrosion resistance, can solve problems such as components that cannot be applied to complex shapes, environmental problems, manufacturing difficulties, etc., and improve the contact corrosion resistance of dissimilar metals. Effect
Inactive Publication Date: 2010-04-28
KOBE STEEL LTD
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AI Technical Summary
Problems solved by technology
Conventional technology 1 cannot be applied to components with complex shapes because it uses thermal spraying
Conventional techniques 2, 4 and 8 are difficult to paint at the closest position or gap of the joint
Conventional Technology 3 It is difficult to implement the operation of stably applying DC voltage by providing terminals on different metal materials for conveyors or building materials
Conventional Technology 5 The operation of applying Cr plating to metals has limitations in the size of applicable members
Also, since hexavalent chromium is used, there are environmental concerns
Conventional Technology 6: It is very difficult to manufacture a thin piece plated with dissimilar metals in the junction, and there is a possibility that the thinner piece will disappear due to the heat at the time of joining.
Conventional technology 7, when applied to joint members, has little effect because the plating film at the joint part is melted and removed
Method used
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Embodiment
[0051] 1. Experimental method
[0052] (1) spot welding
[0053] The soft steel plate (30×100×0.8mm) and the aluminum plate (6022 and 5023, 30×100×0.8mm) were spot welded under the conditions of 12kV and 200ms.
[0054] (2) Zinc salt treatment
[0055] It was immersed in the solution shown in Table 1 at 60 degreeC for 30-120 s.
[0056] (3) Chemical conversion treatment
[0057] Treatment process: follow (a) degreasing → (b) water washing → (c) surface adjustment → (d) chemical conversion treatment (dipping treatment) → (e) drying after chemical conversion → (f) water washing → (g) pure water washing → (h ) Dehydration and drying → (i) The order of coating was processed.
[0058] (a) Degreasing: using an alkaline degreasing treatment agent (manufactured by Nippon Paint Co., Ltd., trade name "Sufficrina-SD250", A agent: 1.5wt%, B agent: 0.9wt% aqueous solution, dipped at 43°C Processed for 2 minutes.
[0059] (b) Washing with water: The sample was immersed in channel wate...
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The invention discloses a heterogenic metal joint structure preparing method with excellent corrosion resistance, which is characterized by the following: immersing the butt iron material and aluminumor aluminum alloy structure in the solution with fluorine coordination and zinc ion; evolving near the butt part for metal zinc; improving touching corrosion-resistance of heterogenic metal reliably.
Description
technical field [0001] The present invention relates to a member excellent in dissimilar metal contact corrosion resistance used in aluminum-steel dissimilar metal joints used in automobiles and the like, and to a manufacturing method thereof. Background technique [0002] It is known that when dissimilar metals are used in combination in joints of components such as automobiles, corrosion is promoted because the dissimilar metals come into contact with each other to conduct electricity. [0003] The corrosion caused by the contact of such dissimilar metals is caused by the difference in the ionization tendency of the metals, a potential difference is generated between the metals, and a corrosion current flows. Conventionally, the following countermeasures have been known to prevent corrosion caused by contact of dissimilar metals. [0004] (1) Conventional technology 1 (patent document 1 etc.) [0005] When the metal exhibiting a low potential is in contact with the metal...
Claims
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IPC IPC(8): C23C18/16C23F15/00
Inventor 井户秀和武田实佳子漆原亘加藤淳
Owner KOBE STEEL LTD