挤压态Mg-2Sn-1Al-1Zn合金在模拟体液中的电化学腐蚀行为

doi:10.11902/1005.4537.2019.226

中国腐蚀与防护学报

2020, Vol. 40

Issue (2): 146-150 DOI: 10.11902/1005.4537.2019.226

研究报告

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挤压态Mg-2Sn-1Al-1Zn合金在模拟体液中的电化学腐蚀行为

张尧¹, 郭晨¹, 刘妍慧¹, 郝美娟¹, 成世明¹, 程伟丽¹^,²(

)

1 太原理工大学材料科学与工程学院太原 030024
2 太原理工大学山西省先进镁基材料重点实验室太原 030024

Electrochemical Corrosion Behavior of Extruded Dilute Mg-2Sn-1Al-1Zn Alloy in Simulated Body Fluid

ZHANG Yao¹, GUO Chen¹, LIU Yanhui¹, HAO Meijuan¹, CHENG Shiming¹, CHENG Weili¹^,²(

)

1 School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2 Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology, Taiyuan 030024, China

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摘要:

通过对挤压态Mg-2Sn-1Al-1Zn合金进行电化学测量 (稳定开路电位、极化曲线、阻抗) 以及浸泡在模拟人体体液 (SBF) 不同时间后的阻抗测试，研究其在模拟体液中的电化学腐蚀行为。结果表明：挤压态Mg-2Sn-1Al-1Zn合金的稳态开路电位值 (OCP) 约为-1.57 V_SCE，极化腐蚀速率 (V_i) 为8.98 mm/a, 阻抗 (R_p) 为1011.21 Ω·cm²。浸泡在模拟体液中不同时间的阻抗结果表明，阻抗呈先增大后减小的趋势，浸泡2 h后，峰值阻抗为2151.62 Ω·cm²，这与浸泡后合金表面出现致密的腐蚀产物层有关。

关键词 ：镁合金, 挤压, 模拟体液, 电化学测试, 腐蚀行为

Abstract：

The electrochemical behavior of the extruded dilute Mg-2Sn-1Al-1Zn alloy was examined in simulated body fluid (SBF) by means of electrochemical workstation CS350. While stable open circuit potential, polarization curve and the impedance data after immersion for different time were measured. Results indicate that the stable open circuit potential value was -1.57 V_SCE, the polarization corrosion rate was 8.98 mm/a and the corrosion resistance was 1011.21 Ω·cm². Impedance tests at different time of immersion in simulated body fluids showed that the corrosion resistance first increased and then decreased. Due to the corrosion product layer on the surface of the soaked alloy is the densest after 2 h of immersion, the value of corrosion resistance reached a maximum of 2151.62 Ω·cm².

Key words： magnesium alloy extrusion simulated body fluid electrochemical testing corrosion behavior

收稿日期: 2019-04-28

ZTFLH:

TG174.46

基金资助:中国山西留学基金(2014-023);山西省高校科技创新项目(2014017);山西省自然科学基金(201801D121088)

通讯作者: 程伟丽 E-mail: chengweili7@126.com

Corresponding author: CHENG Weili E-mail: chengweili7@126.com

作者简介: 张尧，男，1993年生，硕士生

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引用本文:

张尧, 郭晨, 刘妍慧, 郝美娟, 成世明, 程伟丽. 挤压态Mg-2Sn-1Al-1Zn合金在模拟体液中的电化学腐蚀行为[J]. 中国腐蚀与防护学报, 2020, 40(2): 146-150.
Yao ZHANG, Chen GUO, Yanhui LIU, Meijuan HAO, Shiming CHENG, Weili CHENG. Electrochemical Corrosion Behavior of Extruded Dilute Mg-2Sn-1Al-1Zn Alloy in Simulated Body Fluid. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 146-150.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.226 或 https://www.jcscp.org/CN/Y2020/V40/I2/146

图1 挤压态合金的开路电位与极化曲线

表1 挤压态合金极化测试的拟合参数

图2 挤压态合金的EIS图

图3 挤压态合金的EIS等效电路图

表2 挤压态合金EIS数据的拟合电化学参数

图4 挤压态TAZ合金浸泡模拟体液中的析氢曲线

图5 挤压态合金在模拟体液中浸泡不同时间的Nyquist曲线

表3 挤压态合金在不同时间间隔EIS测试结果的拟合参数

图6 挤压态合金在模拟体液浸泡2.5 h后的腐蚀产物表面SEM像

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