Paper Title:
Evaluation of Initial Corrosion Phenomenon of Magnesium Alloys by SKPFM
  Abstract

Magnesium (Mg) has the lowest standard electrode potential in structural materials, and then it easily corroded for that property contacting with other metals. The corrosion resistance of Mg alloys was generally investigated by conducting saltwater immersion test, salt spray test, and electrochemical corrosion test. However, these tests give only macroscopic information but don’t give microscopic (i.e. galvanic corrosion at the interface). So, the origin of galvanic corrosion at the interface between dispersoids and a-Mg in Mg alloys was investigated for fundamental clarification. In this paper, the surface potential difference (VSPD) at the interface between dispersoids and a-Mg using AZ91D Mg alloy is measured by using Scanning Kelvin Probe Force Microscope (SKPFM). Surface potential of pure metals measured by SKPFM had good correlation with standard electrode potential (SEP), and then VSPD also positively correlated with difference of SEP. Salt water immersion test was conducted using AZ91D in order to compare VSPD with corrosion phenomenon. Topographic map around the interface between dispersoids and a-Mg was measured by using AFM after corrosion test. Corroded phase corresponded to the anodic phase indicated by surface potential.

  Info
Periodical
Chapter
Chapter 6: Corrosion and Surface Modification
Edited by
Hajo Dieringa, Norbert Hort and Karl Ulrich Kainer
Pages
397-400
DOI
10.4028/www.scientific.net/MSF.690.397
Citation
K. Kondoh, N. Nakanishi, R. Takei, H. Fukuda, J. Umeda, "Evaluation of Initial Corrosion Phenomenon of Magnesium Alloys by SKPFM", Materials Science Forum, Vol. 690, pp. 397-400, 2011
Online since
June 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Christopher M.A. Brett, Heloísa A. Acciari, Antonio C. Guastaldi
463
Authors: Edith Ariza Avila, L.A. Rocha
Abstract:Practical applications of metal/ceramic joints can be found in the biomedical field regarding the encapsulation of implantable telemetric...
189
Authors: Su Qiu Jia, Guo Jun Liu, Qi Shuang Chen
Abstract:Mg-7.3Al magnesium alloys were investigated in the paper. The paper presents microstructural characterization of Mg-7.3Al alloy after casting...
585
Authors: Bing Ying Wang, Zhen Tong Sun
Abstract:Four different metal coatings of pure aluminum, aluminum zinc alloy, titanium, aluminum Titanium were prepared on the surface of X80 pipeline...
533
Authors: Er Chao Ding, Zhen Yong Man, Xin Xin Yang, Jing Tai Zhao
Chapter 2: Materials and Alloys
Abstract:The effects of heat treatment on microstructure and corrosion resistance of Ni-Cr-Mo-Fe nickel-based alloys were investigated by X-ray...
773