Tinned copper alloy bar with excellent abrasion resistance, insertion properties, and heat resistance

A copper alloy and tin-plating technology, which is applied to contact parts and other directions, can solve problems such as heat resistance degradation and achieve excellent heat resistance

Active Publication Date: 2011-02-23
JX NIPPON MINING & METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, if the Sn-plated phase is thinned, the characteristic deterioration due to the disappearance of the Sn phase will occur earlier
That is, if only the Sn plating layer is thinned, the insertion force decreases, but the heat resistance deteriorates

Method used

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  • Tinned copper alloy bar with excellent abrasion resistance, insertion properties, and heat resistance
  • Tinned copper alloy bar with excellent abrasion resistance, insertion properties, and heat resistance
  • Tinned copper alloy bar with excellent abrasion resistance, insertion properties, and heat resistance

Examples

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Embodiment

[0080] The production examples of the copper alloy tin-plated bar of the present invention and the results of characteristic tests are shown below, but these are provided for better understanding of the present invention and its advantages, and are not intended to limit the present invention.

[0081] (a) base material

[0082] On a copper alloy composed of Cu-35%Zn (thickness 0.32mm, tensile strength 540Mpa, 0.2% endurance 510Mpa, Young's modulus 103GPa, electrical conductivity 26%IACS, Vickers hardness 171Hv) , perform Ni plating, bottom layer copper plating, Sn plating, and implement remelting treatment in the following order. The above-mentioned Vickers hardness is a value obtained by measuring a cross-section perpendicular to the rolling direction of the base material in accordance with JIS Z 2244.

[0083] (b) Plating treatment

[0084] (Electrolytic Degreasing Sequence)

[0085] Electrolytic degreasing is carried out in an alkaline aqueous solution with the sample as...

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Abstract

Disclosed is a tinned bar with excellent abrasion resistance, insertion properties and heat resistance that is suitable for use as conductive spring material. In an electroplating process, the surface of a copper alloy bar is base-plated and then Sn-plated. This is followed by a reflow process. The height difference between the outermost surface of the Sn plating and the outermost point of the Cu-Sn alloy phase of the copper alloy tinned bar is 0.1-0.5 mm, the maximum height of the roughness curve of the Cu-Sn alloy phase is 0.6-1.2 mm, the average length of the roughness curve of the Cu-Sn alloy phase is 2.0-5.0 mm, and preferably 2.0 <= Rsm / (y + Rz) <= 4.0. From its surface to the base material, the plating film consists of a Sn layer 0.5-1.5 mm thick, a Cu-Sn alloy layer 0.6-2.0 mm thick, and a Cu layer 0-0.8 mm thick, of a Sn layer 0.5-1.5 mm thick, a Cu-Sn layer 0.4-2.0 mm thick, and a Ni layer 0.1-0.8 mm thick.

Description

technical field [0001] The present invention relates to a tin-plated strip which is excellent in wear resistance, insertion property and heat resistance and is suitable as a conductive elastic material such as connectors, terminals, relays and switches. Background technique [0002] Sn-plated copper or copper alloy strips have been used as conductive elastic materials for electronic components such as connectors, terminals, relays, and switches for automobiles and civilian use, which exert the excellent corrosion resistance of Sn, solder wettability, characteristics of electrical connectivity. The Sn-plated bar of copper alloy is usually manufactured through the following steps: in a continuous plating production line, after degreasing and pickling, the underlying Cu-plated phase is formed by electroplating, then the Sn-plated phase is formed by electroplating, and finally remelting ( reflow) treatment to melt the Sn-plated phase. [0003] In the Sn-plated material, the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D7/00C25D5/10H01R13/03C25D5/50
CPCC25D7/0614C25D7/00C25D5/10C25D5/50C25D5/611C25D5/505C25D5/605C25D3/58H01R13/03
Inventor 小池健志
Owner JX NIPPON MINING & METALS CO LTD
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