High-strength antioxidant tin bronze alloy and preparation method thereof

Abstract

The invention discloses a high-strength antioxidant tin bronze alloy and a preparation method, belongs to the field of copper alloys, and aims to improve the antioxidant capacity of the alloy and endow the alloy with the combined properties of high strength, uniform corrosion resistance and pitting corrosion resistance on the basis of not reducing the strength of the alloy. The high-strength antioxidant tin bronze alloy comprises, in mass%, 98%-99.7% of copper (Cu), 0.01%-1% of aluminum (Al), 0-0.01% of iron (Fe), 0.05%-1% of tin (Sn), 0.006%-0.025% of phosphorus (P), and the balance no more than 0.05% of impurities. The invention further discloses a preparation method of the high-strength antioxidant tin bronze alloy, and the optimal adding sequence of various elements is disclosed.

Description

【Technical field】 [0001] The invention relates to the field of copper alloys, in particular to a high-strength oxygen-resistant tin bronze alloy and a preparation method thereof. 【Background technique】 [0002] In order to improve the pressure resistance capacity of copper tubes used in existing pipelines such as air-conditioning and refrigeration, chemical equipment, and pressure vessels, micro-alloy copper tubes with higher strength are gradually adopted from the original phosphorus-deoxidized copper (TP1, TP2), and the material grade is QSn0.5-0.025, wherein tin (Sn) content is 0.25%-0.6%; phosphorus (P) content is 0.015%-0.035%; iron (Fe) content is less than 0.01%, and the rest is copper content. [0003] This grade of bronze alloy provides a copper alloy material with high pressure resistance. The copper tube made of this copper alloy material can overcome the defect of low pressure resistance of ordinary phosphorus deoxidized copper tubes, and has good toughness and w...

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Problems solved by technology

[0003] This grade of bronze alloy provides a copper alloy material with high pressure resistance. The copper tube made of this copper alloy material can overcome the defect of low pressure resistance of ordinary phosphorus deoxidized copper tubes, and has good toughness and welding performance. , a certain strength and density, but it still has the same situation as the phosphorus deoxidized copper tube, which is easy to oxidize and not resistant to pitting corrosion

[0004] Bronze alloys of this grade are available in S 2 - , Cl - , NH 4 + Aerobic corrosion is particularly prone to aerobic corrosion in an atmosphere with a high content, which greatly increases the leakage risk of air-conditioning refrigeration, chemical equipment, and pressure vessels, and affects the service life of the equipment. The aerobic pitting corrosion of copper pipes is more harmful, such as pitting corrosion and uniform corrosion such as ant nest corrosion in a humid environment with residual oil. Frequent replacement of pipes not only affects the use but also increases the transportation of refrigerants, etc. Media waste.

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