Effect of pH on corrosion behavior of CuCrZr in solution without and with NaCl

Kwok, Chi Tat; Wong, Pak Kin; Man, Hau Chung; Cheng, F. T.

doi:10.1016/j.jnucmat.2009.08.006

Cited by 25 publications

(12 citation statements)

References 17 publications

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“…As a strong oxidiser, H 2 O 2 , if used solely in a posttreatment process, can lead to oxidation of Cr 3+ to Cr 6+ as reported previously [64]. However, according to Pourbaix diagrams [65], the potential of post-treatment is too low to have the oxidation of Cr 3+ to Cr 6+ and the zirconium oxide is stable in this range of potentials and pH (+0.2 V vs SHE and 4.0 < pH < 5.0). However, the chromium oxidation with formation of Cr 6+ during the first seconds of post-treatment can not be completely excluded due to possible local pH surface increase.…”

Section: Accepted Manuscriptmentioning

confidence: 65%

Influence of post-treatment time of trivalent chromium protection coating on aluminium alloy 2024-T3 on improved corrosion resistance

Stoica

Światowska

Romaine

et al. 2019

Surface and Coatings Technology

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Low corrosion protection performances of Trivalent Chromium Process (TCP) coatings with reference to Chromium Conversion Coatings (CCC) deposited on aluminium alloys can be overcome by application of post-treatment processes. This work shows the effect of post-treatment bath (containing hydrogen peroxide and lanthanum salt) on the chemical composition, structure and the corrosion performances of TCP coating deposited on AA 2024-T3 aluminium alloy. Different times of post-treatment bath were applied on the TCP coating and the samples were analyzed by Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS), X-ray Photoelectron Spectroscopy (XPS) and Glow Discharge-Optical Emission Spectrometry (GD-OES). The ToF-SIMS and GD-OES depth profiles show that the post-treatment time has no influence on the thickness of the TCP coating and on its bi-layered structure. It is composed of an outer layer, rich in zirconium and chromium oxides and an inner layer rich in aluminium oxides and oxy-fluorides. 3D ToF-SIMS images reveal an enrichment of Cr and Zr-like species over the surface of intermetallic particles with reference to alloy matrix, whereas a homogenous distribution of La is observed. The analysis of in-depth distribution shows that La is present principally in the outer part of the TCP coating. The La concentration increases with increasing post-treatment time. The effect of post-treatment time on protection was evaluated by Electrochemical Impedance Spectroscopy (EIS) and Linear Sweep Voltammetry (LSV) in a 0.001 M NaCl + 0.1 M Na 2 SO 4 electrolyte. The increased posttreatment time enhances the cathodic inhibition against oxygen reduction. The post-treatment provides improved coating homogeneity and sealing properties.

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Section: Accepted Manuscriptmentioning

confidence: 65%

Influence of post-treatment time of trivalent chromium protection coating on aluminium alloy 2024-T3 on improved corrosion resistance

Stoica

Światowska

Romaine

et al. 2019

Surface and Coatings Technology

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show abstract

“…In neutral NaCl solution, oxygen participates in the corrosion reaction. However, the anodic reaction results in the formation of Cu 2 O [40]:…”

Section: àmentioning

confidence: 99%

Laser fabrication of W-reinforced Cu layers: I. Corrosion behavior in 3.5% NaCl solution and synthetic acid rain

Wong¹,

Kwok²,

Man

et al. 2016

Materials Chemistry and Physics

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“…Chexal et al (1998) discusses that the rate of metal loss from the wall depends on solubility of the metal ions at the metal surface. For CuCrZr, acidic pH in the 1 to 5 range will not allow formation of stable surface oxides so the alloy surface will not form and keep a protective oxide layer (Kwok et al 2009). Kwok et al also discussed that at pH of 7, a passivation behavior is observed and becomes more pronounced as the pH increases to 10.…”

Section: Flow and Flow Mediamentioning

confidence: 99%

In-Vessel Coil Material Failure Rate Estimates for ITER Design Use

Cadwallader¹

2013

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Effect of pH on corrosion behavior of CuCrZr in solution without and with NaCl

Cited by 25 publications

References 17 publications

Influence of post-treatment time of trivalent chromium protection coating on aluminium alloy 2024-T3 on improved corrosion resistance

Influence of post-treatment time of trivalent chromium protection coating on aluminium alloy 2024-T3 on improved corrosion resistance

Laser fabrication of W-reinforced Cu layers: I. Corrosion behavior in 3.5% NaCl solution and synthetic acid rain

In-Vessel Coil Material Failure Rate Estimates for ITER Design Use

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