Environment-friendly high-conductivity elastic corrosion resistant copper alloy and production method of strip thereof

Abstract

The invention aims at disclosing an environment-friendly high-conductivity elastic corrosion resistant copper alloy and a production method of a strip thereof. The alloy comprises, by mass percent, 1.0 to 5.0% of Sn, 0.5 to 1.5% of Mg, 0.2 to 0.5% of Ni, 0.2 to 0.5% of Si, 0.2 to 0.5% of Zn, 0.05 to 0.2% of Al, 0.05 to 0.20% of Mn, 0.05 to 0.10% of Ce, 0.005 to 0.01% of Ca, and the balance Cu and inevitable impurities, wherein the content of the impurity Fe is smaller than or equal to 0.01%, and the total amount is 100%. In the alloying element, Sn/Mg is larger than or equal to 2.5 and smaller than or equal to 5.0, (Mg+Ni)/Si is larger than or equal to 2.5 and smaller than or equal to 4.0, and Ni/(Al+Mn) is larger than or equal to 2.5 and smaller than or equal to 4.0. In the copper ally, the content of Si, Mn, Ce, and Ca is reasonably controlled, the alloy melt can be effectively purified, the casting blank grains are refined, inverse segregation is reduced, the alloy smelting casting and machining performance is good, and electric conductivity is high. In the copper ally, the ratio of (Mg+Ni)/Si and the ratio of Ni/(Al+Mn) are reasonably controlled, through combined regulation of uniform annealing, cold rolling cogging, recrystallization annealing, intermediate rolling, aging, finish rolling and stress relief annealing, the strengthening phase in alloy can be sufficiently separated out, and the alloy board with the excellent mechanical property can be obtained.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a production method of an environment-friendly, high-missile, corrosion-resistant copper alloy and its plate and strip material. Background technique [0002] Tin-containing copper alloys such as C5050 have excellent mechanical properties and electrical conductivity, and are widely used in electronic information engineering, electrical engineering, mechanical engineering and other fields as materials for terminal blocks and connectors. In recent years, with the expansion of the application field of functional copper alloys, the requirements for the environmental applicability of copper alloys are getting higher and higher. Especially in some corrosive application scenarios, such as mechanical engineering and marine engineering with corrosive media, higher requirements are put forward for the corrosion resistance of elastic conductive copper alloys. Alloys suc...

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Problems solved by technology

[0003] CN103088229A discloses a copper alloy for low-cost connectors and a processing method thereof, by controlling the content of alloying elements to 0.01%≤Fe≤0.5%, 0.25≤Fe / Ni≤5 to improve the mechanical properties of the alloy, and using semi-continuous casting method to produce alloys, but its electrical conductivity is low, only 10-16% IACS, and the semi-continuous casting yield and production efficiency are low

CN103131894A discloses a high-elasticity high-conductivity copper alloy and its production method, which consists of 0.1-1% Fe, 0.05-0.3% P, 0.1-1.0% Sn, 0.1-1.0% Ni, 13-20% Zn, 0.005- Composed of 0.05% B and copper, the alloy has good electrical conductivity, but its high Zn content is prone to dezincification corrosion in high-salt environments, and the corrosion resistance is insufficient

CN108285988A discloses a precipitation-strengthened copper alloy and its application. Its main components are: Cu: 80-95wt%, Sn: 0.05-4.0wt%, Ni: 0.01-3.0wt%, Si: 0.01-1.0wt%, At the same time, 0.01-2.0wt% Co and 0.01-2.0wt% Fe are included to improve the mechanical properties of the alloy, but the addition of Co and Fe will affect the electrical conductivity and hot workability of the alloy

[0004] Although the above-mentioned copper alloys achieve good results in a single performance, they do not meet the requirements of high strength and high conductivity, high stress relaxation resistance and high corrosion resistance at the same time, and the preparation methods of the above-mentioned copper alloys still adopt traditional methods. The casting process (ingot casting or semi-continuous casting process), its production cost is relatively high

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