Effect of heat treatment on microstructure and incrustation inhibition properties of copper-zinc alloys

doi:10.13251/j.issn.0254-6051.2024.01.025

Abstract

Abstract: In order to solve the problem of incrustation damage to boilers, pipelines and other industrial equipment, a new type of incrustation inhibition alloy was designed and melted. The microstructure and surface properties of the copper-zinc alloy before and after heat treatment were characterized by means of scanning electron microscope, EDS energy spectrometer, X-ray diffractometer, electrochemical workstation and contact angle measuring instrument. The test was conducted on the independently built water circulation platform, and the residual Ca²⁺ concentration in the solution and the change of incrustation inhibition rate of the Cu-Zn alloy were determined after the water circulation experiment. The incrustation in the circulating water was collected and analyzed for micro-morphology and crystal structure changes. The results show that the copper-zinc alloy has the best corrosion resistance after heat treatment at 600 ℃, with a self-corrosion current density of 4.27 μA·cm^-2, and has the best incrustation inhibition properties, and the incrustation inhibition rate of the test solution can reach 90.27% when it is left to stand for 0.5 h after being treated with the alloy heat-treated at 600 ℃, which is an improvement of 11.06% in comparison with that of the as-cast alloy, the as-cast alloy has a incrustation inhibition rate of 79.21%.The copper-zinc incrustation inhibition alloy treatment solution has a certain timeliness, incrustation inhibition effect in 2 h is the best. The copper-zinc alloy after heat-treatment at 600 ℃ has a stronger ability to transform the block calcite into needle aragonite, the ratio of calcite to aragonite after the generation of incrustation by treating the solution with which is 1.38∶1.

Key words: heat treatment, incrustation inhibition alloy, surface free energy, polarization curve, incrustation morphology

CLC Number:

TG146.1

Hou Yanyang, Wu Yuxuan, Cao Zhu, Li Jingyuan. Effect of heat treatment on microstructure and incrustation inhibition properties of copper-zinc alloys[J]. Heat Treatment of Metals, 2024, 49(1): 160-165.

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