Investigation of corrosion behaviors of Mg–6Gd–3Y–0.4Zr alloy in NaCl aqueous solutions

Guo, Xingwu; Chang, Jian-Wei; He, Shangming; Ding, Wenjiang; Wang, Xi-Shu

doi:10.1016/j.electacta.2006.09.010

Cited by 87 publications

(30 citation statements)

References 15 publications

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“…Electrochemical measurements were performed with Advanced Electrochemical System PARSTAT 2273 from Princeton Applied Research. The apparatus were described elsewhere [21].…”

Section: Methodsmentioning

confidence: 99%

Comparison of the corrosion behaviour in 5% NaCl solution of Mg alloys NZ30K and AZ91D

et al. 2007

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The corrosion behaviour of AZ91D and NZ30K (Mg-3Nd-0.2Zn-0.4Zr) alloys was investigated in 5% NaCl solution by immersion tests and electrochemical measurements. The immersion tests showed that the corrosion rate of NZ30K was about half that of AZ91D. The localized corrosion of AZ91D was more severe than that of NZ30K due to the higher cathode-to-anode area ratio and higher difference in potential of the cathode phase and the anode matrix. The corrosion of AZ91D concentrated on certain areas and resulted in much deeper corrosion pits, whilst that of NZ30K spread across the surface and led to more uniform and shallow corroded areas. The corrosion products of NZ30K were more compact than those of AZ91D as indicated by SEM. The cyclic polarization curves showed that NZ30K had higher pitting corrosion resistance than AZ91D.

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“…Electrochemical measurements were performed with Advanced Electrochemical System PARSTAT 2273 from Princeton Applied Research. The apparatus were described elsewhere [21].…”

Section: Methodsmentioning

confidence: 99%

Comparison of the corrosion behaviour in 5% NaCl solution of Mg alloys NZ30K and AZ91D

et al. 2007

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“…6, indicated that the corrosion products, in each case, were composed of tiny erect flakes aligned perpendicular to the alloy surface. The phase composition of these corrosion products was previously [28] identified by X-ray diffraction to be mainly Mg(OH) 2 with a small amount of Gd(OH) 3 . The cross sections indicate that the corrosion product films on F and T4 specimens (Fig.…”

Section: Corrosion Productsmentioning

confidence: 99%

Influence of heat treatment and microstructure on the corrosion of magnesium alloy Mg-10Gd-3Y-0.4Zr

et al. 2008

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The corrosion of Mg alloy Mg-10Gd-3Y-0.4Zr, in the as-cast (F), solution treated (T4) and aged (T6) conditions, was investigated in 5% NaCl solution by immersion tests and potentiodynamic polarization measurements. The as-cast (F) condition had the highest corrosion rate due to micro-galvanic corrosion of the a-Mg matrix by the eutectic. Solution treatment led to the lowest corrosion rate, attributed to the absence of any second phase and a relatively compact protective surface film. Ageing at 250°C increased the corrosion rate with increasing ageing time to 193 h attributed to increasing micro-galvanic corrosion acceleration of the Mg matrix by increasing amounts of the precipitates. Ageing for longer periods caused a decrease in the corrosion rate attributed to some barrier effect by a nearly continuous second-phase network. Electrochemical measurements did not give accurate evaluation of the corrosion rate in agreement with the immersion tests.

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“…[4][5][6][7][8][9][10][11][12][13] The common way of improving heat-resistance of magnesium alloys is to form thermally stable precipitates to prevent grain boundary sliding during the creep deformation. On the other hand, the corrosion resistance of magnesium alloys was improved by forming a continuous secondary phases acting as a corrosion barrier or adding elements may incorporate into the protective film and thus increasing its stability.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Corrosion Properties of Mg-<I>x</I>Sn-5Al-1Zn (<I>x</I>=0, 1, 5 and 9 mass%) Alloys

et al. 2010

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In the present work, the corrosion properties of Mg-xSn-5Al-1Zn (x ¼ 0, 1, 5 and 9 mass%) alloys have been investigated. Potentiodynamic polarization and immersion tests were carried out in 3.5% NaCl solution of pH 7.2 at room temperature to measure the corrosion properties of Mg-xSn-5Al-1Zn (x ¼ 0, 1, 5, and 9 mass%) alloys. Microstrucral analysis shows the Mg 17 Al 12 and Mg 2 Sn phase were mainly precipitated along grain boundaries. With increase of the Sn contents, the volume fraction of the secondary phases, i.e. Mg 17 Al 12 and Mg 2 Sn phase, was increased. The corrosion resistance of Mg-xSn-5Al-1Zn alloys was improved by the Sn addition. Especially, the AZ51-5 mass%Sn alloy characterized the superior corrosion resistance in the studied alloys. It seems that the presence of Sn stabilized the Mg(OH) 2 layers on the surface of Mg alloys and the secondary phases effectively formed semi-continuous structures, resulting in a drastic improvement of corrosion resistance of the Mg alloys.

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Investigation of corrosion behaviors of Mg–6Gd–3Y–0.4Zr alloy in NaCl aqueous solutions

Cited by 87 publications

References 15 publications

Comparison of the corrosion behaviour in 5% NaCl solution of Mg alloys NZ30K and AZ91D

Comparison of the corrosion behaviour in 5% NaCl solution of Mg alloys NZ30K and AZ91D

Influence of heat treatment and microstructure on the corrosion of magnesium alloy Mg-10Gd-3Y-0.4Zr

Microstructure and Corrosion Properties of Mg-<I>x</I>Sn-5Al-1Zn (<I>x</I>=0, 1, 5 and 9 mass%) Alloys

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