4.6 Article

Corrosion Resistance of Mg/Al Vacuum Diffusion Layers

Journal

COATINGS
Volume 12, Issue 10, Pages -

Publisher

MDPI
DOI: 10.3390/coatings12101439

Keywords

Mg1; Al1060; diffusion welding; intermetallic compounds; diffusion layers; corrosion resistance

Funding

  1. Scientific Research Funding Project of the Education Department of Liaoning Province [2019LNQN01]
  2. Doctoral Scientific Research Starting Fund of Department of Science and Technology of Liaoning Province [2021-BS-241]

Ask authors/readers for more resources

This study successfully welded magnesium and aluminum using a vacuum diffusion welding process, and analyzed the microstructures and phase compositions of the diffusion layers. The results showed that the diffusion layers had different phase compositions and exhibited good corrosion resistance. Particularly, the corrosion resistance of the Mg2Al3 layer and the Mg17Al12 layer was comparable to pure aluminum.
This study used a vacuum diffusion welding process to weld magnesium (Mg1) and aluminum (Al1060). The diffusion layers, with different phase compositions, were separated and extracted by grinding. The diffusion layers' microstructures and phase compositions were analyzed using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Furthermore, the corrosion resistance of each diffusion layer and the substrates were investigated and compared by performing corrosion immersion tests and linear polarization measurements in a 3.5 wt.% NaCl solution. The results showed that diffusion layers consisting of Mg2Al3, Mg17Al12, and Mg17Al12/Mg-based solid solutions were formed at the interface of the Mg1/Al1060 vacuum diffusion joint. Furthermore, each diffusion layer's structure and morphology were of good quality, and the surfaces were free from defects. This result was obtained for a welding temperature of 440 degrees C and a holding time of 180 min. The corrosion current density of Mg1 was 2.199 x 10(-3) A/cm(2), while that of the Al1060, Mg2Al3, Mg17Al12, and Mg17Al12/Mg-based solid solutions increased by order of magnitude, reaching 1.483 x 10(-4) A/cm(2), 1.419 x 10(-4) A/cm(2), 1.346 x 10(-4) A/cm(2,) and 3.320 x 10(-4) A/cm(2), respectively. The order of corrosion rate was Mg1 > Mg17Al12 and Mg-based solid solution > Mg2Al3 > Mg17Al12 > Al1060. Moreover, all diffusion layers exhibited an improved corrosion resistance compared to Mg1. This was especially the situation for the Mg2Al3 layer and Mg17Al12 layer, whose corrosion resistances were comparable to that of Al1060.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available