Salt spray corrosion behaviour of new Mg–Al alloys containing Nd or Gd

Mohedano, M.; Arrabal, R.; Pardo, Á.; Merino, M.C.; Paucar, K.; Casajús, P.; Matykina, E.

doi:10.1179/1743278212y.0000000058

Cited by 17 publications

(11 citation statements)

References 45 publications

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“…Similarly, Manivannan et al reported that alloying AZ61 with 0.5 wt% Y reduced the corrosion rate (from 7.9 to 3.3 mm/year) in 3.5 wt% NaCl solution. Arrabal et al and Mohedano et al reported that alloying AM50 with Nd and Gd in quantities less the 2 wt% decreased the corrosion rates in atmospheric testing with high relative humidity (80%, 90%, and 98%), and in salt spray testing. Zhang et al also reported that addition of 0.5 wt% Gd improved the corrosion resistance of Mn–Zn–Y, electrochemically tested in 3 wt% NaCl solution.…”

Section: Introductionmentioning

confidence: 98%

Understanding the corrosion behaviour of the magnesium alloys EV31A, WE43B, and ZE41A

Soltan

Dargusch

Shi

et al. 2019

Materials & Corrosion

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The corrosion rates of the Mg alloys immersed in 3.5 wt% NaCl solution saturated with Mg(OH)2 were in the following increasing order: WE43B (0.23 mm/y) < EV31A (0.88 mm/y) < pure‐Mg (1.6 mm/y) < ZE41A (8.5 mm/y). The average corrosion rate for WE43B was somewhat lower than the intrinsic corrosion rate of Mg as shown by high‐purity Mg, attributed to (a) no corrosion acceleration by the small second phase particles, and (b) a more protective surface film. The high corrosion rates of ZE41A were attributed to the presence of a coarse semicontinuous T‐phase, which served as strong cathodic sites.

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Section: Introductionmentioning

confidence: 98%

Understanding the corrosion behaviour of the magnesium alloys EV31A, WE43B, and ZE41A

Soltan

Dargusch

Shi

et al. 2019

Materials & Corrosion

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“…However, high chemical reactivity and poor corrosion and wear resistance limit the widespread use of magnesium alloys in many applications [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Cerium-based sealing of PEO coated AM50 magnesium alloy

Mohedano

Blawert

Zheludkevich

2015

Surface and Coatings Technology

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a b s t r a c t a r t i c l e i n f o Available online xxxx Keywords: Magnesium PEO Cerium Sealing CorrosionEnvironmentally friendly Ce-based sealing post-treatments were developed for PEO coatings on AM50 magnesium alloy. The influence of the Ce(NO 3 ) 3 concentration in the Ce bath and the time of the sealing process were evaluated in terms of morphological and structural properties using SEM, EDS and XRD. Ce content in the layer increased with both the amount of salt in the solution and the time of the sealing post-treatment process due to a higher Ce product accumulation into the pores and cracks of the coatings. Sealed PEO coatings revealed an improvement in the corrosion protection properties as measured by electrochemical impedance spectroscopy. Differences in the corrosion resistance values for the sealed coatings indicate a strong relation between the parameters of the sealing process and its effectiveness, showing higher resistance for the sealed PEO coating developed after 3 h of immersion in 10 g/l Ce(NO 3 ) 3 sealing bath.

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“…Finer grains improve corrosion resistance, and an increased second phase decreases the corrosion resistance if the second phase distributes discontinuously 5,20,23,24 or enhance the corrosion resistance if the second phase distributes continuously as a barrier against the corrosion. 27,28 In this study, the grains were refined significantly with increasing Sr. From the perspective of grain size, the corrosion resistance may be improved with more Sr. Simultaneously with more Sr, the Mg 17 Sr 2 phase increased apparently and distributed more continuously, which can either deteriorate the corrosion resistance due to the microgalvanic corrosion between Mg matrix and the eutectic phases or enhance the corrosion resistance due to the more continuously distributed eutectic phases.…”

Section: Corrosion Resistance In Sbfmentioning

confidence: 95%

Effects of Sr on microstructure and corrosion resistance in simulated body fluid of as cast Mg–Nd–Zr magnesium alloys

Zhang

Xue

et al. 2013

Corrosion Engineering, Science and Technology

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Mg-2?2Nd-xSr-0?3Zr alloys (wt-%, x50, 0?4, 0?7 and 2?0) were prepared by gravity casting to study the effects of Sr addition on the microstructure and corrosion resistance of Mg-Nd-Zr alloys in simulated body fluid (SBF). Phases were identified by X-ray diffraction, and microstructure was observed with optical microscopy and scanning electron microscopy. Corrosion resistance of the alloys was determined by evaluating mass loss and hydrogen evolution during immersion in SBF. Mg 17 Sr 2 phase was formed, and the grain size decreased with additional Sr addition. For the grain refinement and more continuous second phase, which could improve the corrosion resistance, the alloy with 0?7 wt-%Sr showed the slowest corrosion rate, whereas the alloy with 2?0 wt-% showed the fastest corrosion rate due to the increased volume fraction of Mg 17 Sr 2 , which led to severe local microgalvanic corrosion.

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Salt spray corrosion behaviour of new Mg–Al alloys containing Nd or Gd

Cited by 17 publications

References 45 publications

Understanding the corrosion behaviour of the magnesium alloys EV31A, WE43B, and ZE41A

Understanding the corrosion behaviour of the magnesium alloys EV31A, WE43B, and ZE41A

Cerium-based sealing of PEO coated AM50 magnesium alloy

Effects of Sr on microstructure and corrosion resistance in simulated body fluid of as cast Mg–Nd–Zr magnesium alloys

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