AZ31镁合金超声辅助工艺下稀土氧化物化学转化膜制备及腐蚀行为研究

肖飞燕, 冉潇潇, 刘静, 向庆, 杨峰

doi:10.16577/j.issn.1001-1560.2022.0160

材料保护 >

2022 , Vol. 55 >Issue 6: 92 - 97

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0160

工艺探讨

AZ31镁合金超声辅助工艺下稀土氧化物化学转化膜制备及腐蚀行为研究

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贵州师范大学材料与建筑工程学院

杨峰(1985-)，硕士，副教授，主要研究方向为金属腐蚀，电话：18585833286，E - mail：474820562@qq.com

收稿日期: 2021-12-24

修回日期: 2022-01-20

录用日期: 2022-02-28

网络出版日期: 2024-01-09

基金资助

黔科合基础([2020]1Z041) ；贵州师范大学大科项目(DK2020A064)资助

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Preparation and Corrosion Behavior of Rare Earth Oxide Chemical Conversion Membrane for AZ31 Magnesium Alloy by Ultrasonic Assisted Process

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School of Materials and Architectural Engineering, Guizhou Normal University, Guiyang 550025, China

Received date: 2021-12-24

Revised date: 2022-01-20

Accepted date: 2022-02-28

Online published: 2024-01-09

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摘要

为了有效提高AZ31镁合金在3.5%(质量分数，下同)NaCl溶液中的耐蚀性，研究了CeO2浓度及超声辅助和无超声辅助工艺对AZ31镁合金在混合镀液(0.300 mol/L Na2MoO4+0.120 mol/L NaF +0.050 mol/L Na3PO4+0.075 mol/L K2FeO4)中制备的化学转化膜的影响，以及该化学转化膜对AZ31镁合金耐蚀性的影响。实验结果显示：在超声辅助工艺下，加入0.050 mol/L CeO2于混合镀液中进行镀膜后，镁合金的腐蚀电位明显正向移动，腐蚀电流密度显著降低；在3.5%NaCl溶液中浸泡96 h之后，其表面仍比较光滑，没有观察到明显的裂纹，镁合金基体得到了有效保护。

关键词： AZ31镁合金; 超声; 化学转化膜; CeO2; 耐蚀性

本文引用格式

肖飞燕, 冉潇潇, 刘静, 向庆, 杨峰 . AZ31镁合金超声辅助工艺下稀土氧化物化学转化膜制备及腐蚀行为研究[J]. 材料保护, 2022 , 55(6) : 92 -97 . DOI: 10.16577/j.issn.1001-1560.2022.0160

Abstract

Aiming at improving the corrosion resistance of AZ31 magnesium alloy in 3.5% (mass fraction) NaCl solution, the effects of CeO2 concentration and ultrasonic and non - ultrasonic assisted processes on chemical conversion film of AZ31 magnesium alloy prepared in the mixed bath of 0.300 mol/L Na2MoO4+0.120 mol/L NaF +0.050 mol/L Na3PO4+0.075 mol/L K2FeO4 were studied. In addition, the influence of the chemical conversion film on the corrosion resistance of AZ31 magnesium alloy was also studied. Results showed that in the case of ultrasonic assisted process, when the coating was prepared with an addition of 0.050 mol/L CeO2 in the mixed bath, the corrosion potential of magnesium alloy shifted to be more positive and the corrosion current density decreased significantly. After 96 h immersion in 3.5% NaCl solution, the surface of magnesium alloy was still relatively smooth without obvious cracks, indicating that the magnesium alloy substrate was effectively protected.

Key words： AZ31 magnesium alloy; ultrasonic; chemical conversion film; CeO2; corrosion resistance

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