Formation of an aluminum-alloyed coating on AZ91D magnesium alloy in molten salts at lower temperature

Zhong, Cheng; He, Meifeng; Liu, L.; Chen, Y.J.; Shen, Bin; Wu, Yaxu; Deng, Yaqi; Hu, Wen Bin

doi:10.1016/j.surfcoat.2010.09.034

Cited by 46 publications

(14 citation statements)

References 45 publications

(75 reference statements)

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“…There are no cracks, pile-ups or sink-ins observed around the indent edges of the Mg 17 Al 12 and Mg 2 Al 3 intermetallic compounds. Similar results have also been reported for the diffusion coatings obtained by the molten salt bath [82]. The hardness value of the top surface of the diffusion coating is very high and it decreases to approach the hardness of the matrix in the substrate.…”

Section: Hardness and Wear Resistancesupporting

confidence: 87%

Protective diffusion coatings on magnesium alloys: A review of recent developments

Zhong

Fan

et al. 2012

Journal of Alloys and Compounds

157

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Section: Hardness and Wear Resistancesupporting

confidence: 87%

Protective diffusion coatings on magnesium alloys: A review of recent developments

Zhong

Fan

et al. 2012

Journal of Alloys and Compounds

157

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“…[25][26][27][28][29][30] The relationship between the CPT and the PREN of the single phase has been discussed for UNS S82441 DSS.…”

Section: Corrosion-february 2013mentioning

confidence: 99%

Effect of Annealing Temperature on the Pitting Corrosion Behavior of UNS S82441 Duplex Stainless Steel

Yang¹,

Tan²,

Zhang³

et al. 2013

CORROSION

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The pitting corrosion behavior of UNS S82441 duplex stainless steel annealed at six different temperatures ranging from 1,000°C to 1,130°C for 1 h has been investigated by means of the potentiostatic critical pitting temperature. The microstructure evolution and pit morphologies of the specimens were studied using optical/scanning electron microscopy. The results demonstrated that the volume fraction of the austenite phase decreased with the increasing annealing temperature. Lower critical pitting temperature values were obtained after annealing at higher temperatures. Pitting was initiated preferentially inside the ferrite domains, indicating that the ferrite phase had inferior pitting corrosion resistance as compared to the austenite phase. The pitting resistance equivalent number of the ferrite phase fell with the annealing temperature, while the values for the austenite phase rose. No equal pitting resistance equivalent number of the ferrite and austenite phases was found for this steel in the range of annealing temperatures.

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“…Molten salts are also applied as a liquid medium. As indicated in [15][16][17], the heat treatment of an AZ91D substrate with molten salts containing AlCl 3 led to the formation of a surface layer composed of Mg-Al intermetallic phases. Modified layers containing intermetallic phases fabricated by thermochemical treatment exhibit high hardness, high wear resistance and good corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Surface Layer of Mg Enriched with Al and Si by Thermochemical Treatment

Mola¹,

Stępień²,

Cieślik³

2017

Archives of Foundry Engineering

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The modified surface layers of Mg enriched with Al and Si were fabricated by thermochemical treatment. The substrate material in contact with an Al + 20 wt.% Si powder mixture was heated to 445 o C for 40 or 60 min. The microstructure of the layers was examined by OM and SEM. The chemical composition of the layer and the distribution of elements were determined by energy dispersive X-ray spectroscopy (EDS). The experimental results show that the thickness of the layer is dependent on the heating time. A much thicker layer (1 mm) was obtained when the heating time was 60 min than when it was 40 min (600 μm). Both layers had a non-homogeneous structure. In the area closest to the Mg substrate, a thin zone of a solid solution of Al in Mg was detected. It was followed by a eutectic with Mg 17 Al 12 and a solid solution of Al in Mg. The next zone was a eutectic with agglomerates of Mg 2 Si phase particles; this three-phase structure was the thickest. Finally, the area closest to the surface was characterized by dendrites of the Mg 17 Al 12 phase. The microhardness of the modified layer increased to 121-236 HV as compared with 33-35 HV reported for the Mg substrate.

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Formation of an aluminum-alloyed coating on AZ91D magnesium alloy in molten salts at lower temperature

Cited by 46 publications

References 45 publications

Protective diffusion coatings on magnesium alloys: A review of recent developments

Protective diffusion coatings on magnesium alloys: A review of recent developments

Effect of Annealing Temperature on the Pitting Corrosion Behavior of UNS S82441 Duplex Stainless Steel

Characterization of the Surface Layer of Mg Enriched with Al and Si by Thermochemical Treatment

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