超声表面滚压对AZ31B镁合金腐蚀行为的影响

doi:10.11902/1005.4537.2019.205

中国腐蚀与防护学报

2020, Vol. 40

Issue (6): 560-568 DOI: 10.11902/1005.4537.2019.205

研究报告

本期目录 | 过刊浏览

超声表面滚压对AZ31B镁合金腐蚀行为的影响

岳亮亮, 马保吉(

)

西安工业大学机电工程学院陕西省特种加工重点实验室西安 710021

Effect of Ultrasonic Surface Rolling Process on Corrosion Behavior of AZ31B Mg-alloy

YUE Liangliang, MA Baoji(

)

Shaanxi Province Special Processing Key Laboratory, School of Mechanical and Electrical Engineering, Xi'an Technological University, Xi'an 710021, China

全文: PDF(10424 KB) HTML

摘要:

对AZ31B镁合金进行超声滚压表面处理，利用电化学测试手段评价了改性后合金的耐蚀性能，通过SEM和白光干涉仪观察分析了合金处理层微观组织、表面形貌以及腐蚀后表面形貌。结果表明，经过表面处理后，镁合金表层晶粒发生明显细化且表面平整，表面腐蚀产物分布均匀且致密性高，去除腐蚀产物后表面点蚀坑细小密集。在浸泡前期，经表面处理试样的钝化膜层电阻R_f为9020 Ω，远大于未经表面处理试样的14.8 Ω。在浸泡中期，未经表面处理试样的阻抗谱图上出现扩散过程引起的阻抗特征，此时钝化膜层电阻R_f为22.9 Ω，远远小于经表面处理试样的19800 Ω。在浸泡后期，表面处理试样钝化膜层电阻R_f为31400 Ω，而未经表面处理试样的为11400 Ω。超声表面滚压处理降低了镁合金表面粗糙度及晶粒尺寸，进而增加了镁合金在溶液中钝化膜的均匀性和致密性，阻滞了镁合金表面的电化学反应过程，延缓了镁合金的腐蚀。

关键词 ：镁合金, 超声滚压, 阻抗谱, 表面形貌, 电化学, 腐蚀机理

Abstract：

The article aims to develop a new processing technique to efficiently improve the corrosion resistance of Mg-alloy, thus ultrasonic surface rolling process (USRP) was applied to modify the corrosion resistance of extruded AZ31B Mg-alloy. The grain size and surface morphology as well as the corrosion behavior of AZ31B Mg-alloy before and after ultrasonic surface rolling were comparatively examined by means of metallomicroscope and scanning electron microscopy, white light interferometer and electrochemical impedance spectroscopy. The results implied that USRP has significant influence on the grain size and surface morphology, in turn it has important influence on the corrosion behavior of AZ31B alloy. Compared with the bare alloy, the corrosion product film on USRPed alloy was much uniform and dense, while after removal of the corrosion products, small and dense corrosion pits could be seen on the Mg-alloy surface. The passivation film resistance (R_f=9020 Ω) of the treated alloy was much larger than that (R_f=14.8 Ω) of the bare alloy in the early stage of immersion. The impedance characteristic caused by the diffusion process appeared on the impedance spectrum of the bare alloy in the middle of immersion. At this time, the film resistance R_f=22.9 Ω, which is much smaller than the film resistance R_f=19800 Ω of the USRPed alloy. In the late stage of immersion, the passivation film resistance was R_f=31400 Ω for the USRPed alloy, while R_f=14400 Ω for the bare Mg-alloy. It follows that the ultrasonic surface rolling process could reduce the surface roughness, and refine the grains of Mg-alloy, thus increase the uniformity and compactness of passivation film on Mg-alloy, namely retard the electrochemical reaction process on the alloy surface, therewith reduce the occurrence of local pitting, then reduce the corrosion rate of Mg-alloy.

Key words： magnesium alloy ultrasonic surface rolling process EIS surface morphology electrochemical behavior corrosion mechanism

收稿日期: 2019-11-09

ZTFLH:

TG174.4

基金资助:陕西省重点研发计划(2018GY-120);陕西省特种加工重点实验室开放基金(2017SXTZKFJG02);陕西省教育厅重点;实验室科研计划项目(17JS056)

通讯作者: 马保吉 E-mail: mabaoji@xatu.edu.com

Corresponding author: MA Baoji E-mail: mabaoji@xatu.edu.com

作者简介: 岳亮亮，男，1994年生，硕士生

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引用本文:

岳亮亮, 马保吉. 超声表面滚压对AZ31B镁合金腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2020, 40(6): 560-568.
Liangliang YUE, Baoji MA. Effect of Ultrasonic Surface Rolling Process on Corrosion Behavior of AZ31B Mg-alloy. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 560-568.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.205 或 https://www.jcscp.org/CN/Y2020/V40/I6/560

图1 超声表面滚压加工示意图

图2 用于形貌观察和腐蚀性能测试的试样

图3 用于微观组织观察的试样

图4 镁合金AZ31B在车削和USRP加工后的表面三维形貌及表面轮廓

图5 滚压前后镁合金试样的微观组织形貌

图6 两种镁合金试样在37 ℃浸泡不同时间后的Nyquist图

图7 两种试样在PBS中浸泡360 h后的表面腐蚀形貌

图8 两种试样在PBS中浸泡360 h并去除腐蚀产物后的表面腐蚀形貌

图9 浸泡2 h后试样1和试样2的Bode图

图10 滚压前后镁合金试样在PBS溶液中的溶解模型及等效电路

图11 浸泡24，48，和96 h后两种镁合金试样的Bode图

表1 两种镁合金试样浸泡不同时间后的阻抗拟合结果

图12 浸泡96 h后试样1的等效电路

图13 浸泡144，240，和360 h后两种镁合金试样的Bode图

图14 镁合金试样1和2在PBS溶液中的界面移动模型

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