Effect of extrusion on corrosion properties of Mg-2Ca-χAl (χ = 0, 2, 3, 5) alloys

Wu, Pengpeng; Xu, Fengyu; Deng, Kun-kun; Fu, Han; Zhang, Zhongzhong; Gao, Rui

doi:10.1016/j.corsci.2017.08.014

Cited by 162 publications

(48 citation statements)

References 29 publications

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“…Apart from the above means, extrusion is also considered as one available method for properties enhancement. Extensive studies [21][22][23][24] have proved that the extruded Mg alloys exhibit outstanding mechanical properties and corrosion resistance. In this work, the Mg-2Zn-0.6Zr alloys under the as-cast and as-extruded conditions were fabricated.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Strength and Corrosion Resistance of Mg–2Zn–0.6Zr Alloy with Extrusion

Wang

Song

Cai

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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The microstructure, mechanical properties and corrosion behavior of Mg-2Zn-0.6Zr alloy under the as-cast and asextruded conditions were investigated. Microstructure analysis indicated the remarkable grain refinement by extrusion, as well as notable reductions in volume fraction and size of precipitate phases. As compared with the as-cast alloy, the asextruded alloy exhibited better mechanical performance, especially in yield strength which was promoted from 51 to 194 MPa. Refined grains, dispersive precipitate phases and texture were thought to be the main factors affecting the improved performance in strength. The electrochemical measurement and immersion test revealed the corrosion rate of Mg-2Zn-0.6Zr alloy by extrusion decreased from 1.68 to 0.32 mm/year. The reasons for the enhanced corrosion resistance were mainly attributed to the decreased volume fraction and Volta potential of the precipitate phases, the refinement of the grain size, as well as the formation of more protective corrosion film.

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Section: Introductionmentioning

confidence: 99%

Enhanced Strength and Corrosion Resistance of Mg–2Zn–0.6Zr Alloy with Extrusion

Wang

Song

Cai

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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“…Potentiodynamic polarization tests were performed by an electrochemical workstation (CHI660E type, CH Instruments, Inc., Shanghai, China). The scan rate was about 0.5 mV/s with the range from −1.7 V to −1.3 V. Considering the abnormal anodic behavior brought from negative difference effect, the corrosion current density i corr was obtained by Tafel extrapolation using the cathodic branch [58].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Obvious passivation behavior was observed in the anodic polarization curves of the Mg-3Al-0.36Mn and Mg-3Al-0.45Mn alloys, however, curves of others alloys showed active dissolution characteristics. The breakdown potential E b (marked by the black arrow) of passive film was also obtained [58,84]. Critical parameters from potentiodynamic polarization curves are summarized in Table 4.…”

Section: Electrochemical Tests and Corrosion Analysismentioning

confidence: 99%

Effect of Manganese on Microstructure and Corrosion Behavior of the Mg-3Al Alloys

Shan

Liu

Zeng

et al. 2019

Metals

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Microstructure and corrosion behavior of the Mg-3Al-xMn (x = 0, 0.12, 0.21, 0.36, 0.45) (hereafter in wt.%) alloys were experimentally investigated by electron probe microanalysis (EPMA), scanning electron microscope equipped with energy dispersive X-ray spectroscopy (SEM/EDX), X-ray diffraction (XRD), electrochemical, and hydrogen evolution tests. A new self-constructed Mg-Al-Mn-Fe thermodynamic database was used to predict the solidification paths of the alloys. The addition of Mn showed no grain refinement in the cast Mg-3Al alloys. According to the microstructure observation, Al-Fe phases were observed in the non-Mn-added alloy, while Al8Mn5(LT) (Al8Mn5 in low temperature) became the main intermetallic phase in the Mn-added alloys, and the amount increased gradually with the Mn addition. The τ–Al0.89Mn1.11 phase with lower Al/(Fe + Mn) ratio was observed in the alloys with 0.36 and 0.45 wt.% Mn content. According to the electrochemical tests, all five alloys showed localized corrosion characteristics in 3.5 wt.% NaCl solution. Compared with the Mg-3Al alloy, the corrosion resistance of Mn-added alloys were significantly improved and increased gradually with the Mn addition, which was due to the variation of Al-containing intermetallic compounds. The present experimental investigations and thermodynamic calculations confirmed the mechanism that the increasing amount of Al8Mn5(LT) with Mn addition could encapsulate the B2-Al(Mn,Fe) phase with higher Fe. Therefore, it could prevent this detrimental phase from contacting magnesium matrix, thus suppressing micro-galvanic corrosion and improving corrosion resistance gradually.

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“…The EDS analysis showed that the short strip of intermetallic compound (marked as C) shown in Figure 4b consisted of Mg, Al, and Ca, with a mole ratio of Al to Ca of approximately 2.4:1, which indicated that this strip contained an Al 2 Ca phase. According to a previous study, [24] the mass ratio of Ca/Al in Mg-Al-Ca alloys determines the types of intermetallic compounds. Only Al 2 Ca exists in the alloys when the Ca/Al mass ratio is less than 0.8.…”

Section: Microstructurementioning

confidence: 97%

“…indicated that this strip contained an Al2Ca phase. According to a previous study, [24] the mass ratio of Ca/Al in Mg-Al-Ca alloys determines the types of intermetallic compounds. Only Al2Ca exists in the alloys when the Ca/Al mass ratio is less than 0.8.…”

Section: Microstructurementioning

confidence: 97%

Effect of Ca Content on the Mechanical Properties and Corrosion Behaviors of Extruded Mg–7Li–3Al Alloys

Xiong

Yang

Deng

et al. 2019

Metals

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The effect of Ca addition on the microstructure, mechanical properties, and corrosion behaviors of the extruded Mg–7Li–3Al alloys was investigated. The results showed that the extruded Mg–7Li–3Al–xCa alloys consisted of α-Mg (hcp) + β-Li (bcc) matrix phases and Al2Ca. With increasing Ca content, the amount and morphology of the Al2Ca phase changed significantly. The grains of the extruded Mg–7Li–3Al–xCa alloys were refined by dynamic recrystallization during the extrusion process. The tensile tests results indicated that the extruded Mg–7Li–3Al–0.4Ca alloy exhibited favorable comprehensive mechanical properties; its ultimate tensile strength was 286 MPa, the yield strength was 249 MPa, and the elongation was 18.7%. The corrosion results showed that this alloy with 0.4 wt.% Ca addition exhibited superior corrosion resistance, with a corrosion potential Ecorr of −1.48742 VVSE, attributed to the formation of protective Al2Ca phases.

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Effect of extrusion on corrosion properties of Mg-2Ca-χAl (χ = 0, 2, 3, 5) alloys

Cited by 162 publications

References 29 publications

Enhanced Strength and Corrosion Resistance of Mg–2Zn–0.6Zr Alloy with Extrusion

Enhanced Strength and Corrosion Resistance of Mg–2Zn–0.6Zr Alloy with Extrusion

Effect of Manganese on Microstructure and Corrosion Behavior of the Mg-3Al Alloys

Effect of Ca Content on the Mechanical Properties and Corrosion Behaviors of Extruded Mg–7Li–3Al Alloys

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