采用開爾文掃描探針技術研究鎂合金偶接銅合金的電偶腐蝕規律

肖葵; 董超芳; 李曉剛; 魏丹

doi:10.13374/j.issn1001-053x.2010.08.041

采用開爾文掃描探針技術研究鎂合金偶接銅合金的電偶腐蝕規律

doi: 10.13374/j.issn1001-053x.2010.08.041

肖葵^1,2,
董超芳^1,2,
李曉剛^1,2,
魏丹³

1. 北京科技大學腐蝕與防護中心, 北京 100083;
2. 北京科技大學腐蝕-磨蝕與表面技術北京市重點實驗室, 北京 100083;
3. 中國科協學會服務中心, 北京 100081

基金項目:

國家自然科學基金資助項目（No.50771020）；工業產品環境適應性國家重點實驗室開放基金資助項目

詳細信息

作者簡介:
肖葵(1969-),男,講師,博士,E-mail:xiaokui@sina.com

中圖分類號: TG172.3
計量
- 文章訪問數: 145
- HTML全文瀏覽量: 24
- PDF下載量: 7
- 被引次數: 0
出版歷程
- 收稿日期: 2009-12-23

Galvanic corrosion evaluation of magnesium alloys coupled with brass alloys studied by scanning Kelvin probe technology

1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China;
2. Beijing Key Laboratory for Corrosion-Erosion and Surface Technology, University of Science and Technology Beijing, Beijing 100083, China;
3. Society Service Center, China Association for Science and Technology, Beijing 100081, China

摘要

摘要: 采用開爾文探針技術(SKP)測量AZ91D鎂合金與H62銅合金偶接試樣在鹽霧加速實驗中的電偶腐蝕規律.研究表明:AZ91D鎂合金的電偶腐蝕效應受到陽極與陰極的電位差的影響,AZ91D鎂合金與H62銅合金偶接試樣之間的伏打電位差約為-1.22V,AZ91D鎂合金存在顯著的電偶腐蝕效應.由于存在較大的伏打電位差,在鹽霧實驗初始階段,電偶腐蝕主要發生在偶接界面AZ91D鎂合金一側附近區域,而H62黃銅沒有發生明顯腐蝕.由于AZ91D鎂合金在鹽霧中生成的腐蝕產物對基體具有一定的保護作用,AZ91D鎂合金表面腐蝕產物與基體間存在顯著的伏打電位差,導致AZ91D鎂合金基體形成新的腐蝕產物.因此,隨著鹽霧實驗時間延長,AZ91D鎂合金電偶腐蝕效應降低,H62銅合金腐蝕加快.
- 鎂合金 /
- 電偶腐蝕 /
- 掃描開爾文探針(SKP) /
- 鹽霧實驗
Abstract: The galvanic corrosion of AZ91D magnesium alloy coupled with H62 brass alloy using accelerated testing in salt fog spraying was investigated by using the scanning Kelvin probe technique (SKP). The results show that the galvanic corrosion effect of AZ91D magnesium alloy is influenced by the potential difference between anode and cathode materials. The potential difference between AZ91D magnesium alloy and H62 brass alloy is about -1.22 V during accelerated testing in the initial stage of salt fog spraying. The galvanic corrosion effect of AZ91D magnesium alloy is very significant. Galvanic corrosion occurs mainly at the interface near to AZ91D magnesium alloy, and H62 brass alloy is of no significant corrosion. As the corrosion products of AZ91D magnesium alloy have a protective effect, the potential difference between the corrosion products and matrix is significant, and then new corrosion products occurs in the matrix of AZ91D magnesium alloy. With prolonging the salt spray test time, the galvanic corrosion effect of AZ91 D magnesium alloy reduces and the corrosion of H62 brass alloy accelerates.
- magnesium alloys /
- galvanic corrosion /
- scanning Kelvin probe （SKP） /
- salt spray test