EFFECT OF FRICTION STIR PROCESSING ON CORROSION BEHAVIOR OF CAST AZ91C MAGNESIUM ALLOY

Behzad Hassani, Rudolf Vallant, Fathallah Karimzadeh, Mohammad Hossein Enayati, Soheil Sabooni, Kasyap Pradeep

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The corrosion behavior of as-cast AZ91C magnesium alloy was studied by performing friction stir processing (FSP) and FSP followed by solution annealing and then aging. Phase analysis, microstructural characterization, potentiodynamic polarization test and immersion tests were carried out to relate the corrosion behavior to the samples microstructure. The microstructural observations revealed the breakage and dissolution of coarse dendritic microstructure as well as the coarse secondary β-Mg17Al12 phase which resulted in a homogenized and fine grained microstructure (15μm). T6 heat treatment resulted in an excessive growth and dispersion of the secondary phases in the microstructure of FSP zone. The potentiodynamic polarization and immersion tests proved a significant effect of both FSP and FSP followed by T6 on increasing the corrosion resistance of the cast AZ91C magnesium alloy. Improve in corrosion resistance after FSP was attributed to grain refinement and elimination of segregations and casting defects which makes more adhesive passive layer. Increase in volume fraction of precipitations after T6 heat treatment is determined to be the main factor which stabilizes the passive layer at different polarization values and is considered to be responsible for increasing the corrosion resistance.
LanguageEnglish
JournalSurface review and letters
DOIs
StatusE-pub ahead of print - 5 Jul 2018

Fingerprint

cast alloys
magnesium alloys
Magnesium alloys
corrosion
friction
Friction
Corrosion
Processing
corrosion resistance
Corrosion resistance
microstructure
Microstructure
Potentiodynamic polarization
submerging
heat treatment
polarization
Heat treatment
Grain refinement
adhesives
elimination

Keywords

  • Magnesium cast alloy
  • AZ91C
  • friction stir processing
  • corrosion resistance
  • passivation

Cite this

EFFECT OF FRICTION STIR PROCESSING ON CORROSION BEHAVIOR OF CAST AZ91C MAGNESIUM ALLOY. / Hassani, Behzad ; Vallant, Rudolf; Karimzadeh, Fathallah ; Enayati, Mohammad Hossein ; Sabooni, Soheil; Pradeep, Kasyap .

In: Surface review and letters, 05.07.2018.

Research output: Contribution to journalArticleResearchpeer-review

Hassani, Behzad ; Vallant, Rudolf ; Karimzadeh, Fathallah ; Enayati, Mohammad Hossein ; Sabooni, Soheil ; Pradeep, Kasyap . / EFFECT OF FRICTION STIR PROCESSING ON CORROSION BEHAVIOR OF CAST AZ91C MAGNESIUM ALLOY. In: Surface review and letters. 2018.
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