<strong>MgCl<sub>2</sub></strong>对锌在干湿交替环境中腐蚀行为的影响

doi:10.11901/1005.3093.2019.188

材料研究学报

2019, Vol. 33

Issue (9): 705-712 DOI: 10.11901/1005.3093.2019.188

研究论文

本期目录 | 过刊浏览

MgCl₂对锌在干湿交替环境中腐蚀行为的影响

尹奇^1,²,刘淼然^1,³,刘雨薇¹,潘晨¹(

),王振尧¹(

)

1. 中国科学院金属研究所沈阳 110016
2. 中国科学技术大学材料科学与工程学院沈阳 110016
3. 中国科学院大学北京 100049

Effect of MgCl₂ Deposite on Simulated Atmospheric Corrosion of Zn via Wet-dry Altertnating Corrosion Test

YIN Qi^1,²,LIU Miaoran^1,³,LIU Yuwei¹,PAN Chen¹(

),WANG Zhenyao¹(

)

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
3. University of Chinese Academy of Sciences, Beijing 100049, China

引用本文:

尹奇,刘淼然,刘雨薇,潘晨,王振尧. MgCl₂对锌在干湿交替环境中腐蚀行为的影响[J]. 材料研究学报, 2019, 33(9): 705-712.
Qi YIN, Miaoran LIU, Yuwei LIU, Chen PAN, Zhenyao WANG. Effect of MgCl₂ Deposite on Simulated Atmospheric Corrosion of Zn via Wet-dry Altertnating Corrosion Test[J]. Chinese Journal of Materials Research, 2019, 33(9): 705-712.

全文: PDF(8248 KB) HTML

摘要:

使用腐蚀失重、X射线衍射(XRD)、扫描电子显微镜与能谱(SEM-EDS)等手段研究了干湿交替环境中MgCl₂对锌腐蚀行为的影响。结果表明，MgCl₂对锌的腐蚀有显著的抑制作用；在沉积NaCl条件下锌表面的腐蚀产物为Zn₅(OH)₈Cl₂·H₂O、Zn₄CO₃(OH)₆·H₂O和Zn(OH)₂，而在沉积MgCl₂条件下锌表面的腐蚀产物只有Zn₅(OH)₈Cl₂·H₂O。在干湿交替环境中MgCl₂对锌腐蚀行为的影响主要是Mg²⁺与氧还原反应产生的OH^-结合使阴极区的pH值降低造成的。

关键词 ：材料失效与保护, 大气腐蚀机制, 室内模拟加速腐蚀实验, MgCl₂, 锌

Abstract：

The effect of MgCl₂- and NaCl-deposit on simulated atmospheric corrosion of Zn was comparatively investigated via wet-dry alternating corrosion test, as well as mass loss, X-ray diffraction (XRD), scanning electron microscope equipped with energy dispersive spectrometer (SEM-EDS). The results show that the corrosion rate of Zn was significantly inhibited by the deposition of MgCl₂; the corrosion products formed on Zn plate with NaCl deposit were Zn₅(OH)₈Cl₂·H₂O、Zn₄CO₃(OH)₆·H₂O and Zn(OH)₂, while was only Zn₅(OH)₈Cl₂·H₂O for Zn plate with MgCl₂deposit. It was proposed that the corrosion may be caused by the decrease of pH, which was induced by the precipitation of Mg²⁺ions and OH^- ions, in the cathodic sites.

Key words： materials failure and protection atmospheric corrosion mechanism laboratory simulated corrosion test MgCl₂ zinc

收稿日期: 2019-04-09

ZTFLH:

TG172.3

基金资助:国家自然科学基金(51671197);中国科学院专项(XDA130040502)

作者简介: 尹奇，男，1991年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.188 或 https://www.cjmr.org/CN/Y2019/V33/I9/705

表1 实验中纯锌试样的成分(质量分数)

图1 沉积不同盐的锌腐蚀528 h后的腐蚀失厚

图2 锌腐蚀528 h后腐蚀产物的XRD谱

表2 锌腐蚀528h后蚀产物的XRD检测结果

图3 锌腐蚀528 h后表面的SEM-EDS结果

图4 锌腐蚀528 h后的截面SEM-EDS结果

图5 锌试样表面去除腐蚀产物后的SEM照片

图6 锌的2价腐蚀产物在浓度为4 mol·L-1的Cl-离子溶液中腐蚀产物的优势区

图7 腐蚀后锌试样浸泡液的pH值

表3 离子强度为0、温度为25℃时各反应式及其相应的平衡常数[18]

图8 XRD谱中锌腐蚀产物Zn5(OH)8Cl2·H2O峰的偏移

表4 不同组中腐蚀产物Zn5(OH)8Cl2·H2O的主峰位置与基体Zn主峰位置

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