Study on dynamic corrosion behavior of HAl77-2 copper alloy in seawater desalination working environment

Petroleum Refinery Engineering ›› 2025, Vol. 55 ›› Issue (7): 35-38.

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Study on dynamic corrosion behavior of HAl77-2 copper alloy in seawater desalination working environment

Li Li, Wang Jinguang, Peng Lijun, Zhao Jingmao

1.SINOPEC Engineering Incorporation, Beijing 100101； 2.Beijing University of Chemical Technology, Beijing 100029

Online:2025-07-15 Published:2025-07-21

海水淡化工作环境下 HAl77-2 铜合金动态腐蚀行为研究

李黎, 王金光, 彭礼军, 赵景茂

1.中国石化工程建设有限公司, 北京市100101； 2.北京化工大学, 北京市100029

作者简介:李黎，高级工程师，硕士研究生，从事石化装置选材与腐蚀防护研究。联系电话：010-84875210，E-mail：lili2.sei@sinopec.com。
基金资助:
中国石油化工股份有限公司课题（320103）

Abstract

Abstract:

The dynamic corrosion behavior of HAl77-2 copper alloy was carried out by simulating the actual working environment of the heat-exchange tube in the low-temperature multi-effect distillation unit. The corrosion rate was calculated by the weight-loss method. Results showed that the corrosion rate first increased and then decreased with time, reaching a maximum of 0.0818 mm/a on the 14th day. Surface morphology analysis revealed that after 7 days of dynamic corrosion, the samples lost their metallic luster and exhibited slight pitting; after 14 days, extensive exfoliation occurred and pitting density increased significantly; after 28 days, pits developed into larger corrosion craters. X-ray energy-dispersive spectroscopy indicated that the Zn content on the surface decreased continuously, confirming dezincification corrosion. Electrochemical impedance spectroscopy showed that corrosion resistance gradually weakened with exposure time. After soaking in 3.5 wt% NaCl solution for 3 h, the corrosion resistance improved obviously.

Key words: desalination of seawater, HAl77-2 copper alloy, dynamic corrosion, corrosion rate, macroscopic corrosion, microscopic corrosion, energy spectrum, electrochemical impedance spectroscopy

摘要：

通过模拟低温多效蒸馏装置换热管的实际工作环境，对 HAl77-2 铜合金换热管进行动态腐蚀行为研究。结果表明：试片的腐蚀速率随实验时间先增大后减小，第14天达到最大值0.0818 mm/a；对试片进行表面形貌分析可知，经过7 d 动态腐蚀实验后，试片表面失去金属光泽，并产生少量的点蚀，14 d 后试片表面发生剥蚀，点蚀数量大幅度增加，28 d 后点蚀发展为较大的腐蚀坑；X 射线能谱仪对试片表面的Cu含量和Zn含量进行测定表明，试片表面的Zn含量随腐蚀时间逐渐降低，试片表面存在着脱Zn腐蚀；电化学阻抗谱测试表明，试片耐腐蚀性随实验时间逐渐减弱；在质量分数为3.5%的NaCl溶液中浸泡3 h后，耐蚀性明显提高。

关键词: 海水淡化, HAl77-2铜合金, 动态腐蚀, 腐蚀速率, 宏观腐蚀, 微观腐蚀, 能谱, 电化学阻抗

Li Li, Wang Jinguang, Peng Lijun, Zhao Jingmao. Study on dynamic corrosion behavior of HAl77-2 copper alloy in seawater desalination working environment[J]. Petroleum Refinery Engineering, 2025, 55(7): 35-38.

李黎, 王金光, 彭礼军, 赵景茂. 海水淡化工作环境下 HAl77-2 铜合金动态腐蚀行为研究[J]. 炼油技术与工程, 2025, 55(7): 35-38.

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Study on dynamic corrosion behavior of HAl77-2 copper alloy in seawater desalination working environment

海水淡化工作环境下 HAl77-2 铜合金动态腐蚀行为研究

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