4种镁合金在Cl--NH4+-NO3-溶液体系中的腐蚀行为差异研究

doi:10.11902/1005.4537.2019.250

中国腐蚀与防护学报

2020, Vol. 40

Issue (6): 553-559 DOI: 10.11902/1005.4537.2019.250

研究报告

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4种镁合金在Cl^--NH₄⁺-NO₃^-溶液体系中的腐蚀行为差异研究

于浩冉, 张文丽, 崔中雨(

)

中国海洋大学材料科学与工程学院青岛 266100

Difference in Corrosion Behavior of Four Mg-alloys in Cl^--NH₄⁺-NO₃^- Containing Solution

YU Haoran, ZHANG Wenli, CUI Zhongyu(

)

School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

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摘要:

研究了化学组分和显微组织结构对AZ31，AZ91，AM60和ZK61等4种镁合金在含有不同浓度NH₄NO₃的0.1 mol/L NaCl溶液中腐蚀行为的影响。通过浸泡实验、电化学测试、SEM和CLSM表面分析等探讨了4种镁合金的腐蚀机理。结果表明，NH₄NO₃的存在会加快镁合金的腐蚀；并且由于在特定浓度范围内，Cl^-，NH₄⁺和NO₃^-的协同作用，会发生自催化点蚀。不同镁合金的耐蚀性与合金的化学成分和显微组织密切相关。

关键词 ：镁合金, 硝酸铵, 自催化点蚀, 化学组分, 显微结构

Abstract：

The effect of chemical composition and microstructure on the corrosion behavior of Mg-alloys AZ31, AZ91, AM60 and ZK61 in 0.1 mol/L sodium chloride solution (NaCl) containing different concentration of ammonium nitrate (NH₄NO₃) were investigated. The corrosion processes of the four Mg-alloys were studied by immersion tests, polarization curve measurement, SEM and CLSM. Results show that the addition of NH₄NO₃ accelerates the corrosion of the four alloys, whilst autocatalytic pitting corrosion occurs due to the synergistic effects of Cl^-, NH₄⁺, and NO₃^- in solutions within a specific concentration range. The corrosion resistance of different Mg-alloys is closely related to the chemical composition and microstructure of the alloys.

Key words： Mg-alloy ammonium autocatalytic pitting corrosion chemical composition microstructure

收稿日期: 2019-12-06

ZTFLH:

TG172

基金资助:国家自然科学基金(51601182)

通讯作者: 崔中雨 E-mail: cuizhongyu@ouc.edu.cn

Corresponding author: CUI Zhongyu E-mail: cuizhongyu@ouc.edu.cn

作者简介: 于浩冉，女，1994年生，硕士生

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引用本文:

于浩冉, 张文丽, 崔中雨. 4种镁合金在Cl^--NH₄⁺-NO₃^-溶液体系中的腐蚀行为差异研究[J]. 中国腐蚀与防护学报, 2020, 40(6): 553-559.
Haoran YU, Wenli ZHANG, Zhongyu CUI. Difference in Corrosion Behavior of Four Mg-alloys in Cl^--NH₄⁺-NO₃^- Containing Solution. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 553-559.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.250 或 https://www.jcscp.org/CN/Y2020/V40/I6/553

图1 AZ31，AZ91，AM60和ZK61合金的微观结构

图2 AZ31，AZ91，AM60和ZK61 4种镁合金在0.1 mol/L NaCl和0.1 mol/L NaCl+0.01 mol/L NH4NO3两种溶液中浸泡12 h的失重和腐蚀速率

表1 NH4NO3对4种镁合金的腐蚀加速倍率

图3 AZ31，AZ91，AM60和ZK61镁合金在0.1 mol/L NaCl和0.1 mol/L NaCl+0.01 mol/L NH4NO3溶液中的极化曲线

表2 4种镁合金在0.1 mol/L NaCl溶液中的自腐蚀电流密度 (Icorr) 和腐蚀速率 (Pi)

图4 AZ31，AZ91和ZK61合金在NaCl溶液中浸泡12 h后的腐蚀形貌

图5 4种镁合金在0.1 mol/L NaCl和0.1 mol/L NaCl+0.01 mol/L NH4NO3两种溶液环境中的点蚀参数

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