碱热处理对搅拌摩擦加工AZ31镁合金耐腐蚀性能的影响

doi:10.13251/j.issn.0254-6051.2022.03.012

金属热处理 ›› 2022, Vol. 47 ›› Issue (3): 61-66.DOI: 10.13251/j.issn.0254-6051.2022.03.012

碱热处理对搅拌摩擦加工AZ31镁合金耐腐蚀性能的影响

陈善勇^1,2, 王快社^1,2, 乔柯^1,2, 王文^1,2

1.西安建筑科技大学冶金工程学院, 陕西西安 710055;
2.西安建筑科技大学功能材料加工国家地方联合工程研究中心, 陕西西安 710055

收稿日期:2021-11-08 修回日期:2022-01-18 出版日期:2022-03-25 发布日期:2022-04-22
通讯作者: 乔柯,讲师,硕士,E-mail:qiaokemarshal@126.com
作者简介:陈善勇(1994—),男,硕士研究生,主要研究方向为搅拌摩擦加工工艺和机理,E-mail:shanyong5078@qq.com。
基金资助:
国家自然科学基金(U1760201,52034005,51974220);陕西省自然科学基金(2019JQ-769);陕西省工业重点攻关项目(2020ZDLGY13-06)

Effect of alkali heat treatment on corrosion resistance of friction stir processed AZ31 magnesium alloy

Chen Shanyong^1,2, Wang Kuaishe^1,2, Qiao Ke^1,2, Wang Wen^1,2

1. School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an Shaanxi 710055, China;
2. National and Local Joint Engineering Research Center for Functional Materials Processing, Xi'an University of Architecture and Technology, Xi'an Shaanxi 710055, China

Received:2021-11-08 Revised:2022-01-18 Online:2022-03-25 Published:2022-04-22

摘要/Abstract

摘要： 对AZ31镁合金进行搅拌摩擦加工(Friction stir processing,FSP),并对母材(Basal material, BM)和FSP试样进行碱热处理(Alkali heat treatment,AHT),研究了AHT对搅拌摩擦加工后AZ31镁合金微观组织和耐腐蚀性能的影响。结果表明,FSP可以显著细化晶粒,平均晶粒尺寸由BM的12.8 μm细化至FSP后的3.1 μm,高角度晶界比例从BM的75.9%降低至FSP后的45.3%,晶界亚结构增多。AHT使材料表面形成致密的MgO和Al₂O₃混合涂层,有效地提高了AZ31镁合金的耐浸泡腐蚀性能。

关键词: AZ31镁合金, 搅拌摩擦加工, 微观组织, 碱热处理, 腐蚀

Abstract: Friction stir processing (FSP) was performed on AZ31 magnesium alloy, and alkali heat treatment (AHT) was performed on the basal material (BM) and FSPed specimens. The effect of AHT on microstructure and corrosion resistance of the friction stir processed AZ31 magnesium alloy was studied. The results show that the FSP can significantly refine the grains, the average grain size is decreased from 12.8 μm of BM to 3.1 μm after FSP, the proportion of high angle grain boundaries decreased from 75.9% of BM to 45.3% after FSP, and the grain boundary substructure is increased. The AHT induces the material to form a dense MgO and Al₂O₃ mixed coating on the surface, which effectively improves the immersion corrosion resistance of the AZ31 magnesium alloy.

Key words: AZ31 magnesium alloy, friction stir processing, microstructure, alkali heat treatment, corrosion

中图分类号:

TG146

陈善勇, 王快社, 乔柯, 王文. 碱热处理对搅拌摩擦加工AZ31镁合金耐腐蚀性能的影响[J]. 金属热处理, 2022, 47(3): 61-66.

Chen Shanyong, Wang Kuaishe, Qiao Ke, Wang Wen. Effect of alkali heat treatment on corrosion resistance of friction stir processed AZ31 magnesium alloy[J]. Heat Treatment of Metals, 2022, 47(3): 61-66.

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碱热处理对搅拌摩擦加工AZ31镁合金耐腐蚀性能的影响

Effect of alkali heat treatment on corrosion resistance of friction stir processed AZ31 magnesium alloy

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