Correlative change of corrosion behavior with the microstructure of AZ91 Mg alloy modified with Y additions

Jia, Ruiling; Zhang, Ming; Zhang, Lina; Zhang, Wei; Guo, Feng

doi:10.1016/j.jallcom.2015.02.019

Cited by 50 publications

(16 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a previous work by the authors, a comparable decrease in the surface potential value was observed for Al-Mn-Nd(Fe) intermetallics in as cast AZ91 alloy with 0.3-1.5 wt% Nd [34]. Jia [35] reported an increase in the potential difference between Al-Mn-Y inclusion and the α-Mg matrix in as cast AZ91 alloy with 0.9 wt% Y. In the present work, the opposite behaviour was observed.…”

Section: Discussionsupporting

confidence: 61%

“…A similar behaviour is observed in extruded AZ91 and AM50 alloys with the incorporation of Gd (up to 1 wt%) [9]. Minor additions of Y (0.9 wt%) [35], Ce (0.92 wt%) and La (0.66 wt%) [36] to AZ91 alloy also produce a positive effect. In these cases, the beneficial influence is attributed to the incorporation of Y, Ce and La to the layer of corrosion products.…”

Section: Introductionsupporting

confidence: 72%

“…The Mn capacity to retain Fe impurities is widely known; the findings of this work indicate that Y and Nd are also able to decrease the detrimental effect of Fe. Some authors believe that the positive influence of rare earth additions is mainly related to their incorporation into the semi-protective corrosion products layer [35,36,62]. However, our previous XPS study revealed no evidence of Nd oxides in the composition of the passive layer on Ndmodified AZ91 magnesium alloy [34].…”

Section: Discussionmentioning

confidence: 60%

See 2 more Smart Citations

Corrosion of Mg-9Al alloy with minor alloying elements (Mn, Nd, Ca, Y and Sn)

et al. 2017

View full text Add to dashboard Cite

Microstructure and corrosion behaviour of a Mg-9Al alloy with minor alloying additions (Mn, Y, Nd, Ca and Sn) are evaluated. All of the additions form Al-rich intermetallics with varying amounts of Fe, while Ca and Sn are also incorporated into the eutectic β-phase (β-Mg 17 Al 12). Special attention is given to the surface potential values of the microconstituents, which are related to the formation of microgalvanic couples. Scanning Kelvin Probe Force Microscopy (SKPFM) measurements revealed that all the alloying elements, except Sn, reduced the potential difference between the secondary phases and the matrix, which is the main reason for the improvement of the corrosion resistance of Mn-, Y-and Nd-modified alloys. The beneficial effect of Ca is additionally related to the microstructure refinement and an increased area fraction of the β-phase.

show abstract

Section: Discussionsupporting

confidence: 61%

Section: Introductionsupporting

confidence: 72%

Section: Discussionmentioning

confidence: 60%

See 1 more Smart Citation

Corrosion of Mg-9Al alloy with minor alloying elements (Mn, Nd, Ca, Y and Sn)

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Coy et al found that the Volta potentials of Mg 12 (RE,Y) and Y rich second phases were about 25 and 90 mV, respectively, more positive than that of the matrix of wrought WE43, but did not cause galvanic corrosion to the matrix in 3.5% NaCl. Zhang et al reported that a proper amount of Y addition (0.3–0.9 wt%) could depress the overall corrosion rate of AZ91 alloy. However, a further addition of Y could cause an increment of the corrosion rate, which was attributed to the galvanic corrosion caused by the Al 2 Y and Al 10 Mn 2 Y phases…”

Section: Introductionmentioning

confidence: 99%

The Corrosion Behavior of Mg5Y in Nominally Distilled Water

et al. 2018

View full text Add to dashboard Cite

This paper studies the macro and micro corrosion of Mg5Y in nominally distilled water. The Y-containing corrosion product film formed on the alloy surface provides some protection for the Mg matrix to the galvanic corrosion caused by Y-containing second-phase particles. In some cases, there is no corrosion of the matrix surrounding most of the second phase particles. However, about 2% of the second-phase particles in the as-cast Mg5Y causes micro-galvanic corrosion, resulting in 'bump' or 'volcano' shaped corrosion product deposit. These 'active particles' cannot be significantly reduced by solution-heat-treatment.

show abstract

“…As a result, the micro-galvanic-current density between α phase to adjacent β grain decreased and caused corrosion in the refined primary α grain with low content of aluminium. Then the devastation of the micro-galvanic corrosion was effectively restrained [19]. Addition of RE elements restricts the application of Mg alloys because of its higher cost.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%