乙二醇冷却液的劣化检测及增材制造<strong>AlSi10Mg</strong>铝合金在其中的腐蚀行为

doi:10.11902/1005.4537.2024.324

中国腐蚀与防护学报

2025, Vol. 45

Issue (4): 1014-1024 CSTR: 32134.14.1005.4537.2024.324 DOI: 10.11902/1005.4537.2024.324

研究报告

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乙二醇冷却液的劣化检测及增材制造AlSi10Mg铝合金在其中的腐蚀行为

雷涛¹, 陈绍高², 刘秀利¹, 范金龙³, 郑兴文²^,³(

)

1 中国电子科技集团公司第十研究所成都 610036
2 四川轻化工大学化学与环境工程学院自贡 643000
3 材料腐蚀与防护四川省重点实验室自贡 643000

Corrosion Behavior of Laser Additive Manufacturing AlSi10Mg Al-alloy in Ethylene Glycol Coolant and Detection of Coolant Degradation

LEI Tao¹, CHEN Shaogao², LIU Xiuli¹, FAN Jinlong³, ZHENG Xingwen²^,³(

)

1 The 10th Research Institute of China Electronics Technology Group Corporation, Chengdu 610036, China
2 School of Chemistry and Environmental Engineering, Sichuan University of Scinece and Engineering, Zigong 643000, China
3 Material Corrosion and Protection Key Laboratory of Sichuan Province, Zigong 643000, China

引用本文:

雷涛, 陈绍高, 刘秀利, 范金龙, 郑兴文. 乙二醇冷却液的劣化检测及增材制造AlSi10Mg铝合金在其中的腐蚀行为[J]. 中国腐蚀与防护学报, 2025, 45(4): 1014-1024.
Tao LEI, Shaogao CHEN, Xiuli LIU, Jinlong FAN, Xingwen ZHENG. Corrosion Behavior of Laser Additive Manufacturing AlSi10Mg Al-alloy in Ethylene Glycol Coolant and Detection of Coolant Degradation[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 1014-1024.

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摘要:

针对乙二醇冷却液的劣化问题和铝合金在其中的腐蚀问题，通过恒温油浴和热循环模拟实验探讨增材制造铝合金及其冷板在商用乙二醇冷却液中的长期腐蚀行为以及冷却液的劣化规律。结果表明，冷却液的pH值、储备碱度均随实验时间的增加而减小，冷却液中铝离子、机械杂质和乙二醇酸性氧化产物的含量升高，其中乙醛酸是主要的酸性氧化产物。冷却液劣化监测指标参数在恒温油浴实验和热循环实验中呈现不同的变化趋势，在热循环实验中存在一个明显的时间转折点，且热循环实验中铝合金的腐蚀速率均显著高于恒温油浴实验。铝合金试样表面的腐蚀产物由Al₂O₃、Al-乙二醇、Al-乙二醇氧化产物以及缓蚀组分沉淀物组成。

关键词 ：冷却液, 增材制造铝合金, 乙二醇, 劣化, 腐蚀

Abstract：

The long-term corrosion behavior of test pieces and cooling plate of laser additive manufactured AlSi10Mg Al-alloy in commercial ethylene glycol coolant was assessed via isothermal test at 88 ℃ and thermal cyclic test, meanwhile the degradation of ethylene glycol coolant was examined along with the corrosion process. The results showed that the pH value and reserve alkalinity of the coolant decreased with the increasing time, while the content of Al ions, mechanical impurities, and acidic oxidation products of ethylene glycol in the coolant increased, and glyoxylic acid was the main acidic oxidation product of ethylene glycol. The monitoring parameters of coolant degradation displayed different trends in thermal cycling test and constant temperature test, with a clear time turning point in thermal cycling test, and the corrosion rate of aluminum alloy in thermal cycling test was significantly higher than that in isothermal test. The corrosion products on the surface of Al-alloy were composed of Al₂O₃, Al-ethylene glycol, Al-ethylene glycol oxidation products, and precipitates of corrosion inhibiting components.

Key words： coolant laser additive manufacturing Al-alloy ethylene glycol degradation corrosion

收稿日期: 2024-10-08 32134.14.1005.4537.2024.324

ZTFLH:

TG178

基金资助:四川省科技厅应用基础重点项目(2017JY0153)

通讯作者: 郑兴文，E-mail：zxwasd@126.com，研究方向为应用电化学

Corresponding author: ZHENG Xingwen, E-mail: zxwasd@126.com

作者简介: 雷涛，男，1991年生，硕士

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图1 热循环实验铝合金冷板及取样部位示意图

图2 恒温油浴和热循环实验下冷却液pH值的变化曲线

图3 恒温油浴和热循环实验下冷却液储备碱度的变化曲线

图4 恒温油浴和热循环实验不同时间后冷却液中乙二醇氧化产物的分析结果

图5 乙二醇氧化路线图

图6 恒温油浴和热循环实验不同时间后冷却液中乙二醇氧化产物的生成速率

图7 恒温油浴和热循环实验不同时间后冷却液中铝离子的浓度

图8 恒温油浴实验铝合金试样在清除腐蚀产物前后的失重和腐蚀速率

图9 恒温油浴实验前和实验180 d后铝合金试样照片和金相图

图10 铝合金试样经恒温油浴实验不同时间后表面SEM图

图11 热循环实验后液冷冷板不同取样部位流道的数码照片

图12 热循环实验后铝合金冷板不同取样部位流道的SEM图

表1 铝合金试样在恒温油浴实验不同时间后的能谱分析结果

图13 恒温油浴实验后铝合金试样表面的XPS图

表2 热循环实验后铝合金冷板不同取样部位流道的能谱分析结果

图14 铝合金冷板“弯”部位流道元素面扫描图

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