Influences of alloyed Si on the corrosion resistance of Co–Cr–Mo alloy to molten Al by iso-thermal oxidation in air

Tunthawiroon, Phacharaphon; Li, Yunping; Chiba, Akihiko

doi:10.1016/j.corsci.2015.08.014

Cited by 27 publications

(9 citation statements)

References 22 publications

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“…It is clear that the corrosion rate is reduced from 0.0195 to 0.0095 mm/year for Co-28Cr-6Mo-0.1Si and Co-28Cr-6Mo-1.0Si, respectively while the reduced Cr and Mo alloys exhibit the highest corrosion rate. This observation is consistent with the previous observation on the corrosion property of CoCrMo alloys at high temperature application [13]. The presence of Si could slow down the reaction and dissolution of passive film in severe environment due to a positive effect from the oxide film formation.…”

Section: Polarization Testingsupporting

confidence: 82%

Effect of Si on Microstructure and Corrosion Behavior of CoCrMo Alloys

Peaubuapuan

Tunthawiroon

Kanlayasiri

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract:The aim of this research was to investigate the effect of silicon (Si) on the microstructure and corrosion behavior of CoCrMo alloys. The concentration of Si added in CoCrMo alloys was 0.1, 0.5 and 1 wt %. The corrosion behavior of the present alloys was investigated using potentiodynamic polarization measurements. The normal saline solution with 0.9 wt % was used as an electrolyte. Polarization curves obtained from the polarization test were used to evaluate in terms of corrosion current density (i corr ), corrosion potential (E corr ) and corrosion parameters that be used to compute corrosion resistant property of CoCrMo alloys. The microstructure of a sample during the polarization test was compared using X-ray diffraction (XRD) and optical microscope (OM). The results indicated that the increase in Si slightly changed the microstructure of CoCrMo alloys and could enhance the resistance to corrosion of CoCrMo alloys in NaCl solution. In addition, the reduction of Cr and Mo concentration in CoCrMo alloys was found to be a significant influence on the decrease in corrosion resistance.

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Section: Polarization Testingsupporting

confidence: 82%

Effect of Si on Microstructure and Corrosion Behavior of CoCrMo Alloys

Peaubuapuan

Tunthawiroon

Kanlayasiri

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The values of r 2 of the values of k p ranged from 0.90 to 0.99, indicating that the parabolic oxidation law is reasonably applicable to the oxidation behavior. The parabolic rate constant k p depends on temperature according to the Arrhenius equation [26], kp= k0 exp false(−QRTfalse)kp= k0 exp (−QRTfalse) where k 0 represents a constant, Q stands for the activation energy of oxidation, T means the absolute temperature in Kelvin, and R is the universal gas constant. Figure 15 shows the Arrhenius plot for the oxidation of EBM-In718 alloys, the activation energy of the oxidation can be calculated by presenting the variation of k p from the fitting lines.…”

Section: Resultsmentioning

confidence: 99%

Influence of Building Direction on the Oxidation Behavior of Inconel 718 Alloy Fabricated by Additive Manufacture of Electron Beam Melting

Gong

et al. 2018

Materials

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This research was aimed at investigating the high temperature oxidation behavior of Inconel 718 superalloy fabricated by electron beam melting with the building direction of 0°, 55° and 90° deviation from the Z axis of cylindrical samples. Columnar γ-fcc phase with preferred crystal orientations was found in all specimens. With the temperature ranging from 700 to 1000 °C, the 0° sample, symbolized by the lowest grain boundary density, and largest grain size, reveals the best oxidation performance. It is concluded that the building direction has more impact on the amount of grain boundary density than crystal orientation, which determined the oxidation resistance.

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“…Although the reaction is significantly less severe compared to that of tool steels, bare Co-29Cr-6Mo (Co-Cr-Mo) alloy is still gradually corroded under molten Al, leading to the local failure of the alloy due to the formation of intermetallic compounds between the matrix and molten Al [9][10][11][12][13]. In light of this, various methods-including nitriding [14], oxidation treatment [10], and alloying Si [9,15], Al, Ti, and Zr [16]-have been adopted to improve the corrosion resistance of Co-Cr-Mo alloy to molten Al. Among these methods, oxidation treatment is the most economical, simple, and effective.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Anti-Corrosion Performance of Co-Cr-Mo Alloy in Molten Al by Prior Oxidation Treatment

Shang,

Yang,

2023

Materials

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Co-based alloys are promising alternatives to replace the currently used tool steels in aluminum die-casting molds for producing sophisticated products. Although the reaction is significantly less severe compared to that of tool steels, bare Co-29Cr-6Mo (CCM) alloy is still gradually corroded under molten Al, leading to the local failure of the alloy due to the formation of intermetallic compounds between the matrix and molten Al. This study indicated that prior oxidation treatment at 750 °C on CCM alloy is beneficial in enhancing the corrosion resistance of the alloy to molten Al. The is more pronounced in the alloy after a longer oxidation treatment. However, after oxidation for longer than 24 h, the protectiveness of the film cannot be enhanced anymore. In addition, even after the full failure of the oxide film, the thickness loss rate of a sample with prior oxidation treatment is much lower than that of a bare sample. This can be attributed to the fact that network-aligned oxide particles of the cone structure boundary inhibit both the outwards movements of alloying elements and the dissolution of the intermetallic layer.

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Influences of alloyed Si on the corrosion resistance of Co–Cr–Mo alloy to molten Al by iso-thermal oxidation in air

Cited by 27 publications

References 22 publications

Effect of Si on Microstructure and Corrosion Behavior of CoCrMo Alloys

Effect of Si on Microstructure and Corrosion Behavior of CoCrMo Alloys

Influence of Building Direction on the Oxidation Behavior of Inconel 718 Alloy Fabricated by Additive Manufacture of Electron Beam Melting

Enhanced Anti-Corrosion Performance of Co-Cr-Mo Alloy in Molten Al by Prior Oxidation Treatment

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