High-strength corrosion-resistant copper alloy and preparation method thereof

Abstract

The invention discloses a high-strength corrosion-resistant copper alloy and a preparation method thereof. The high-strength corrosion-resistant copper alloy comprises 4.0 to 10.0 wt% of Al, 1.0 to 4.0 wt% of Fe, 1.0 to 4.5 wt% of Mn, 0.8 to 3.5 wt% of Ni, 0.08 to 0.5 wt% of Cr, 0.001 to 0.05 wt% of P, less than or equal to 0.15 wt% of inevitable impurities in total, and the balance of Cu. By adjusting the contents of the Fe, Ni, Cr and P elements, optimizing the processing technology and the heat treatment technology, controlling the composition of a matrix, the grain size and the fine dispersed distribution of a strengthening phase, the effects of all alloy elements are fully exerted, the mechanical property, machinability and corrosion resistance of the alloy are remarkably improved, and the performance of the alloy can be comprehensively improved through thermomechanical treatment. The tensile strength of an annealed material is 560 MPa or above, the yield strength is 330 MPa or above, the yield ratio is 0.55 or above, the ductility is 42% or above, the total immersion uniform corrosion rate is 0.01-0.02 mm / a, and the erosion corrosion rate is 0.2 mm / a or below under the seawater condition with the flow speed being 5 m / s. The alloy can meet the requirements of ocean engineering, ships, petrochemical engineering and the like on the comprehensive performance of the aluminum bronze.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal materials, and in particular relates to a high-strength corrosion-resistant copper alloy and a preparation method thereof. Background technique [0002] Copper alloys are more and more widely used in marine engineering and ships because of their excellent mechanical properties, corrosion resistance and conductivity. The types of alloys include red copper, aluminum brass, tin brass, manganese brass, aluminum bronze, and iron cupronickel The varieties mainly include castings, plates and pipes, etc., which are mainly used as seawater pipelines, propellers, fence structures, etc., for seawater desalination, mariculture, coastal power stations, oil exploration and other resource development and ancillary projects. The copper alloys widely used in marine engineering and ships are mainly HAl77-2, HSn70-1, BFe10-1-1, BFe30-1-1 and 66 / 30 / 2 / 2 alloys. These alloys were developed by adding Fe, Mn, A...

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CN101967579A discloses a new Ti-containing multi-element aluminum bronze alloy material, the composition mass percentage of which is Al: 5.0-7.0%, Fe: 2.0-3.0, Mn: 1.5-3.5, Ni: 2.0-3.5, Ti: 0.05-0.5, and The amount of Cu, the annealed state properties of this alloy, the tensile strength is 550MPa, the yield strength is 325MPa, the elongation is 30%, the static seawater corrosion rate is 0.01-0.02mm / a, and the corrosion rate is 0.01-0.03mm / a under 5m / s seawater erosion. The disclosed alloys have low ductility

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