JPS6013040A - Copper alloy with superior corrosion resistance - Google Patents

Abstract

PURPOSE:To obtain a Cu alloy with high strength and superior corrosion resistance by preparing a specified composition consisting of Al, on or more among Fe, Ni, Cr and Co, and Cu. CONSTITUTION:This Cu alloy with high strength and superior corrosion resistance consists of, by weight, 0.05-1.5% Al, 0.005-1.0% in total of one or more among Fe, Ni, Cr and Co, and the balance Cu with accompanying inevitable impurities or further contains <=0.5% Zn and/or <=0.1% P. The Cu alloy is suitable for use as a material for a radiator for a car, especially for the fins of the radiator. Among said components, Al improves the corrosion resistance, yet >1.5% Al reduces the heat conductivity and workability. Fe, Ni, Cr and Co improve the corrosion resistance and strength, yet when the total amount of them exceeds 1.0%, the heat conductivity is reduced. Zn improves the castability, P acts as a deoxidizer, and they are added as required.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copper alloy having high strength and excellent corrosion resistance, and is suitable for use in automobile radiators, particularly radiator fins.

An automobile radiator dissipates heat by circulating liquid between the engine and the radiator as a cooling medium to adjust the temperature of the engine.Radiator fins dissipate heat from the tubes through which the radiator fluid circulates. It has the function of dissipating into the atmosphere. Therefore, an 0u-8u alloy with high thermal conductivity has been conventionally used as a radiator material. However, in recent years, there has been a strong demand for lighter cars as an energy-saving measure, and radiator fins are also becoming thinner. , gas, etc., the fins can rapidly corrode, significantly impairing the heat dissipation properties of the radiator. For this reason, it is necessary to improve the corrosion resistance of the radiator fin and extend its life even if it sacrifices some thermal conductivity during the initial use of the radiator, as well as maintain long-term fishing strength and prevent a decrease in thermal conductivity due to corrosion. The development of a copper alloy with high corrosion resistance and excellent corrosion resistance has been desired.

In view of this, the present invention was developed as a result of moderate research.
10.05-1.5% by weight, Fe, Ni, Or
, a total of 0.005 to 1.0% by weight of one or more types from the Co0 group.

Alternatively, develop a copper alloy with high strength and excellent corrosion resistance, which contains the above components and either or both of Zn with a weight ratio of 0.5 or less, Fo, or less than 1 weight ratio, and the remainder CU and accompanying inevitable impurities. did.

The effect of the alloy components in the copper alloy with excellent corrosion resistance of the present invention and the reason for limiting the amount added will be explained.

The reason for adding A1 is to improve M eating habits,
The reason why the range was limited to α05 to 1.0 wt.
Since most of the above effects cannot be expected with weight-weight grooves,
The reason why one or more of 8Fe, Ni, Or, and Co is added is because if the amount exceeds 1.0% by weight, the thermal conductivity and processability will decrease.

This is to increase corrosion resistance and strength, and the component range f: o,
The reason for setting it to 1.0% by weight is because if it is less than α005 weight ratio, no improvement in 2 strength can be expected.
．． This is because if it exceeds 0% by weight, thermal conductivity will decrease.

The purpose of Zn is to improve castability, and the reason why the Zn component range is set to 0.5% by weight or less is because if it exceeds α5% by weight, thermal conductivity decreases. P is used as a deoxidizing agent during the melting process, and when using oxygen-free steel.

It is often necessary to add P, but when adding P,
The reason why the component range is set to be below the α1 weight coefficient is because if it exceeds 0.1% by weight, the thermal conductivity decreases and the conductivity falls below the 40-thickness AO8 which is considered desirable as a fin material.

Next, examples of the alloy of the present invention will be described.

Alloys having the various compositions shown in Table 1 were melted, hot-rolled, annealed as appropriate, and then cold-rolled to form a 0.5 mm thick plate and subjected to testing.

Corrosion resistance was tested by cycling a 100 mg J5W+X sample with a plate thickness of 0.5 wn under the conditions shown in Table 2 for 45 days, and then pickling the surface with a 5-layer Et and 4-sulfuric acid solution.

The corrosion weight loss was evaluated based on the weight change before and after the test. Note that the corrosion pattern under these conditions is similar to that of the radiator fin of an actual vehicle.

Strength was evaluated by tensile strength and elongation. Thermal conductivity was evaluated by measuring electrical conductivity, which correlates with this. Incidentally, the conductivity measurement was carried out according to J Engineering SH H2SO4. The results are shown in Table 3.

As is clear from Table 6, the alloy of the present invention is an excellent alloy with higher strength and better corrosion resistance than the 0u-8u alloy.

Claims (4)

[Claims] (1) Al 0.05-1.5% by weight, Fe, N
A copper alloy with excellent corrosion resistance consisting of one or more elements from the group of i, Or, and C3o in a total amount of α005 to 1.0 by weight, and the remainder being O and inevitable impurities accompanying it. (2) Am 0.05-1.5 weight fb, Fe,
The total amount of one or more elements from the group of Ni, Or, and Co [LOO5 to 1.0 weight 1. A copper alloy with excellent corrosion resistance consisting of Zn (L 5% by weight or less, the remainder O and inevitable impurities accompanying it). (3) A'lα05-1.5% by weight, Fe, IJ
The total amount of one or more elements from the group consisting of i, Cr, and Co is 05 to 1.0 by weight 1. Pa1 weight section or less 1
．． 1 remainder (a copper alloy with excellent corrosion resistance consisting of 3U and its accompanying inevitable impurities. (4) AX (L 05~1.5 weight'j, Fe
, Ni, Or, Co, in a total amount of 0.005 to 1.0 weight 1. Znα5
A copper alloy with excellent corrosion resistance, consisting of less than 1% by weight of Pα, the balance being O and inevitable impurities accompanying it.