NaCl沉積和SO<sub>2</sub>污染對鎂合金初期大氣腐蝕行為的影響

林翠; 李曉剛

doi:10.13374/j.issn1001-053x.2004.05.017

NaCl沉積和SO₂污染對鎂合金初期大氣腐蝕行為的影響

doi: 10.13374/j.issn1001-053x.2004.05.017

林翠¹,
李曉剛^1,2

1. 北京科技大學材料科學與工程學院腐蝕與防護中心, 北京 100083;
2. 中國科學院金屬研究所金屬腐蝕與防護國家重點實驗室, 沈陽 110016

基金項目:

科技部國家基礎條件平臺重點項目(No.2003data2C018)和國家“973”項目“材料環境行為與失效機理(No.19990650)

詳細信息

作者簡介:
林翠女,28歲,博士研究生

中圖分類號: TG172.3
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- 被引次數: 0
出版歷程
- 收稿日期: 2004-03-09
- 網絡出版日期: 2021-08-17

Atmospheric Corrosion Initial Stages of Magnesium Alloy in the Presence of NaCl and SO₂

LIN Cui¹,
LI Xiaogang^1,2

1. Corrosion and Protection Center, Key Laboratory for Corrosion, University of Science and Technology Beijing, Beijing 100083, China;
2. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

摘要

摘要: 借助掃描電鏡(SEM/EDX)、X射線衍射(XRD)研究了NaCl單個因素對鎂合金AZ91D初期腐蝕行為的影響,并對SO₂和NaCl的協同作用進行了探討.NaCl存在時初期破壞金屬表面的保護膜,但后期微溶性腐蝕產物的生成導致腐蝕速率的降低.當NaCl和SO₂同時存在時,反應生成的可溶性產物不具有阻礙的作用,同時他們會發生部分溶解生成自由移動的離子,大量難溶物在鎂合金表面難以短時間形成,故NaCl和SO₂同時存在引起的腐蝕遠大于兩者單獨存在時引起的腐蝕加和.NaCl和SO₂對鎂合金的初期大氣腐蝕具有明顯的協同作用.
- SO₂ /
- NaCl /
- 初期 /
- AZ91鎂合金 /
- 協同作用
Abstract: The effects of NaCl and SO₂ on the initial atmospheric corrosion of AZ91D magnesium alloy were studied with a simulated atmospheric corrosion system. The analyses of surface morphology, corrosion products and rust layer structure were integrated by Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD) to investigate the corrosion performance. The results showed that NaCl accelerated the initial atmospheric corrosion of the alloy. The protective film was destroyed in the initial period, but the corrosion rate slowed down because of the formation of slight soluble corrosion products in the later periods in the presence of NaCl. Soluble corrosion products with no inhibitive function developed and partly solved to form the ions of free motion when NaCl and SO₂ existed simultaneously. A great deal of these products were very difficult to grow on the surface in a short time. The combined effect of NaCl and SO₂ on the initial atmospheric corrosion was greater than that caused by each single component.
- SO₂ /
- NaCl /
- initial stage /
- AZ91 magnesium alloy /
- combined effect