Dissolved-Oxygen-Induced Intensive Pitting Corrosion of Amorphous ZrCu Alloys in Thin NaCl Solutions

Tanimoto, H.; Soga, Yosuke; Takayanagi, Yoshinobu; Mizubayashi, H.

doi:10.2320/matertrans.m2010437

Cited by 5 publications

(3 citation statements)

References 24 publications

(32 reference statements)

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“…It is further claimed that the Cu species in the enriched area react with chloride ions to form CuCl, which then in turn undergoes hydrolysis to form Cu 2 O. 4,10,19,21,[26][27][28] As a result, as demonstrated in this work, the Cu content in Zr-Cu-based BMGs (in the interval 15.4-36 at.%) plays an important role for their pitting behavior.…”

Section: Discussionmentioning

confidence: 81%

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Comparing the pitting corrosion behavior of prominent Zr-based bulk metallic glasses

et al. 2014

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Five well-known Zr-based alloys of the systems Zr-Cu-Al-(Ni-Nb, Ni-Ti, Ag) (Cu 5 15.4-36 at.%) with the highest glass-forming ability were comparatively analyzed regarding their pitting corrosion resistance and repassivation ability in a chloride-containing solution. Potentiodynamic polarization measurements were conducted in the neutral 0.01 M Na 2 SO 4 1 0.1 M NaCl electrolyte and local corrosion damages were subsequently investigated with high resolution scanning electron microscopy (HR-SEM) coupled with energy dispersive x-ray spectroscopy (EDX). Both pitting and repassivation potential correlate with the Cu concentration, i.e., those potentials decrease with increasing Cu content. Pit morphology is not composition dependent: while initially hemispherical pits then develop an irregular shape and a porous rim. Corrosion products are rich in Cu, O, and often Cl species. A combination of low Cu and high Nb or Ti contents is most beneficial for a high pitting resistance of Zr-based bulk metallic glasses. The bulk glassy Zr 57 Cu 15.4 Al 10 Ni 12.6 Nb 5 (Vit 106) and Zr 52.5 Cu 17.9 Al 10 Ni 14.6 Ti 5 (Vit 105) alloys exhibit the highest pitting resistance.

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Section: Discussionmentioning

confidence: 81%

“…CuCl in turn undergoes hydrolysis to form Cu 2 O, which is deposited within the pitted region. 4,10,19,21,[26][27][28] Consequently, it may be expected that the Cu content in Zr-Cu-based BMGs determines their pitting resistance. However, no systematic studies in this regard have been carried out so far.…”

Section: Introductionmentioning

confidence: 99%

Comparing the pitting corrosion behavior of prominent Zr-based bulk metallic glasses

et al. 2014

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“…The second layer shows to have the lowest Fe:O ratio and it is suggested to compose of Fe2O3. It is thought the third layer to be a (Fe, Co)3O4 as confirmed by SEM, STEM and EDX with varying Co content but without Ni [95][96]. The fourth layer was found similar tot third layer but with addition of around 3 at.…”

Section: Oxidation Mechanism On Iron Alloysmentioning

confidence: 69%

Selective Oxide Deposition on Fe-Based Alloys in Dry High Temperature Environment – A Review

Hussin¹,

Lah²

2020

ARFMTS

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This paper presents a review of an investigation on selective deposition of oxides on Fe-based alloys in dry high temperature environment. The oxidation reaction occurred in order to promote a protective oxide layer to prevent corrosion attack and secure the metal substrate from degrade further. As temperature increased, the oxidation rate was significantly increased. Selective oxidation of an alloy component significantly lowers the concentration of that particular metal element in the alloy subsurface zones. As the cyclic thermal conditions increases, associated mechanical damage to the oxide scale leads to the porous oxide growth and also accelerates the depletion of alloy element. Eventually, prolong the process a point is reached where diffusion of anion to the alloy becomes competitive with the outward diffusion of metal cation to the developed protective scale. Selective oxidation changes the mechanical properties mainly due to the grain boundary oxidation. It is considered a short-path circuit for diffusion and hence leads to weaken the cohesive strength of individual grains. The focus of this work is to review the complex oxidation process due to the occurrence of selective oxidation and oxide deposition with the growth of oxide scale at different rates and also due to the presence of defects and clear microstructure differences of Fe -based alloys. It is also to enhance basic knowledge regarding the oxide layer behaviour that requires an understanding of alloy composition and microstructure. The consequences of oxide growth are specifically relative to the effects of factors such as exposure duration, temperature and operating parameters that must be clearly understood.

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Effect of alloying elements on the microstructure and corrosion behavior of TiZr-based bulk metallic glasses

et al. 2020

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Dissolved-Oxygen-Induced Intensive Pitting Corrosion of Amorphous ZrCu Alloys in Thin NaCl Solutions

Cited by 5 publications

References 24 publications

Comparing the pitting corrosion behavior of prominent Zr-based bulk metallic glasses

Comparing the pitting corrosion behavior of prominent Zr-based bulk metallic glasses

Selective Oxide Deposition on Fe-Based Alloys in Dry High Temperature Environment – A Review

Effect of alloying elements on the microstructure and corrosion behavior of TiZr-based bulk metallic glasses

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