挤压态低合金化Mg-0.5Bi-0.5Sn-0.5Ca合金的力学性能及腐蚀行为研究

doi:10.11902/1005.4537.2022.084

中国腐蚀与防护学报

2023, Vol. 43

Issue (2): 428-434 CSTR: 32134.14.1005.4537.2022.084 DOI: 10.11902/1005.4537.2022.084

研究报告

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挤压态低合金化Mg-0.5Bi-0.5Sn-0.5Ca合金的力学性能及腐蚀行为研究

张全福¹, 宋蕾¹, 王建¹, 郭振宇², 任乃栋¹, 赵建琪¹, 武维康¹, 程伟丽²(

)

^1.孝义市东义镁业有限公司孝义 032308
^2.太原理工大学材料科学与工程学院太原 030024

Mechanical Properties and Corrosion Behavior of an Extruded Dilute Mg-alloy Mg-0.5Bi-0.5Sn-0.5Ca

ZHANG Quanfu¹, SONG Lei¹, WANG Jian¹, GUO Zhenyu², REN Naidong¹, ZHAO Jianqi¹, WU Weikang¹, CHENG Weili²(

)

^1.Xiaoyi Dongyi Magnesium Industry Co, Ltd., Xiaoyi 032308, China
^2.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

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摘要:

探究了复合添加微量Sn与Ca对挤压态Mg-0.5Bi基合金的微观组织、力学性能及腐蚀行为的影响。结果表明：挤压态Mg-0.5Bi-0.5Sn-0.5Ca (质量分数，%) 合金主要由α-Mg、Mg₂Bi₂Ca以及Mg₂Sn相组成，合金表现出晶粒尺寸均匀分布的完全动态再结晶组织。合金的抗拉强度 (UTS) 为191 MPa，伸长率 (EL) 高达31.5%，腐蚀速率 (P_i) 为0.51 mm/a，极化阻抗 (R_p) 为707.19 Ω·cm²。此外，挤压态合金在腐蚀过程中生成了含Ca以及含Sn的腐蚀产物中间层，从而提升了腐蚀产物层的保护作用，导致析氢速率随着浸泡时间的增加先增大后减小。最后由于腐蚀产物膜的破裂，析氢速率达到了2.43 mL/d。

关键词 ： Mg-Bi基合金, 微观组织, 力学性能, 强化机制, 腐蚀行为

Abstract：

Due to its rapid corrosion rate, the mechanical support function of Mg-alloy implants will be lost in a short time after implantation. Mg-Bi based alloys have attracted much attention in biomedical field because of their non-toxic, excellent biocompatibility and corrosion-resistance. However, the low strength restricts the wide application of Mg-Bi binary alloy. Therefore, the effect of Sn and Ca addition on the microstructure, mechanical properties and corrosion behavior of extruded Mg-0.5Bi-based alloy was investigated in the present article. The results indicated that the extruded Mg-0.5Bi-0.5Sn-0.5Ca (mass fraction,%) alloy consists mainly of phases α-Mg, Mg₂Bi₂Ca and Mg₂Sn, and the alloy presents a fully recrystallized microstructure and uniform grain size distribution. The alloy possesses ultimate tensile strength (UTS) of 191 MPa with elongation at break (EL) of 31.5%. In addition, its corrosion rate (P_i) is 0.51 mm/a and polarization resistance (R_p) is 707.19 Ω·cm². The hydrogen evolution rate initially increased and then decreased with increasing immersion time due to the formation of Sn and Ca-containing products. Finally, the hydrogen evolution rate reached 2.43 mL/d, which is related to the broken of corrosion product film.

Key words： Mg-Bi based alloy microstructure mechanical property strengthening mechanism corrosion behavior

收稿日期: 2022-03-24 32134.14.1005.4537.2022.084

ZTFLH:

TG146

基金资助:山西省留学回国人员资助项目(2019032);山西省镁合金重大科技专项(20191102008)

作者简介: 张全福，男，1972年生，总工程师

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引用本文:

张全福, 宋蕾, 王建, 郭振宇, 任乃栋, 赵建琪, 武维康, 程伟丽. 挤压态低合金化Mg-0.5Bi-0.5Sn-0.5Ca合金的力学性能及腐蚀行为研究[J]. 中国腐蚀与防护学报, 2023, 43(2): 428-434.
Quanfu ZHANG, Lei SONG, Jian WANG, Zhenyu GUO, Naidong REN, Jianqi ZHAO, Weikang WU, Weili CHENG. Mechanical Properties and Corrosion Behavior of an Extruded Dilute Mg-alloy Mg-0.5Bi-0.5Sn-0.5Ca. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 428-434.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.084 或 https://www.jcscp.org/CN/Y2023/V43/I2/428

图1 挤压态Mg0.5Bi-0.5Sn-0.5Ca合金微观组织和晶粒尺寸分布图

图2 挤压态Mg-0.5Bi-0.5Sn-0.5Ca合金的X射线衍射图、第二相分布图和宏观极图

图3 挤压态Mg-0.5Bi-0.5Sn-0.5Ca合金的工程应力-应变曲线、加工硬化曲线和拉伸试样的断口形貌

图4 挤压态Mg-0.5Bi-0.5Sn-0.5Ca合金在模拟体液中的析氢图及对应的腐蚀速率

图5 挤压态Mg-0.5Bi-0.5Sn-0.5Ca合金在模拟体液中的极化曲线和Nyquist图及对应的等效电路图

图6 挤压态Mg-0.5Bi-0.5Sn-0.5Ca合金在模拟体液中浸泡240 h后腐蚀产物成分的XPS分析

表1 Mg-0.5Bi-0.5Sn-(0.5Ca) 合金的耐蚀性能对比

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