Characterization of the surface oxide film of a Co–Cr–Mo alloy after being located in quasi-biological environments using XPS

Hanawa, Takao; Hiromoto, Sachiko; Asami, K.

doi:10.1016/s0169-4332(01)00551-7

Cited by 253 publications

(134 citation statements)

References 22 publications

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“…15) Therefore, these experimental results showing higher Co release than the other elements in each compact are reasonable and in good agreement with those from previous reports. 3,16) As shown in Figs.…”

Section: Relationship Between Metal Release From Zr-addedsupporting

confidence: 92%

Microstructures of Zr-Added Co-Cr-Mo Alloy Compacts Fabricated with a Metal Injection Molding Process and Their Metal Release in 1 mass% Lactic Acid

et al. 2010

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The microstructures of Zr-added Co-29Cr-6Mo alloy compacts fabricated with a metal injection molding (MIM) process and their metal release from the compacts immersed in 1% lactic acid were investigated for medical applications. The relationship between the microstructure and amount of Co released from the compacts is discussed phenomenologically. The relative density of the Co-29Cr-6Mo compacts increased when Zr was added to the powder with amounts of 0.03 and 0.1 mass% and sintered in Ar or N 2 . The amounts of Co released from the compacts containing 0.03 and 0.1 mass% Zr sintered in Ar or N 2 were smaller than those from the other compacts. Therefore, the addition of Zr to the Co29Cr-6Mo powders enhanced the sintering of the compacts and decreased the porosity in the resultant products, leading to the suppression of the Co release from the compacts. When the Zr-added Co-29Cr-6Mo alloy powders were sintered in N 2 , the relative density of the compacts was smaller than that of those sintered in Ar. The powders were nitrided during sintering in N 2 , and the nitrides disturbed the densification during sintering. In addition, a lamellar structure was formed in the Co-29Cr-6Mo and Co-29Cr-6Mo-0.5Zr compacts. The amount of Co released from these compacts was larger than that released from the other compacts because local corrosion occurred at the interface between the different phases in these compacts during immersion in 1% lactic acid. In the MIM process, a small addition of Zr (less than 0.1 mass%) to the Co-29Cr-6Mo alloy is effective for densification during sintering and suppression of the Co release from the compacts.

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Section: Relationship Between Metal Release From Zr-addedsupporting

confidence: 92%

Microstructures of Zr-Added Co-Cr-Mo Alloy Compacts Fabricated with a Metal Injection Molding Process and Their Metal Release in 1 mass% Lactic Acid

et al. 2010

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“…The extra oxygen originated from OH − and H 2 O. Co(OH) 2 and Cr(OH) 3 possibly exist in the oxide lm, but molybdenum hydroxide is hardly formed because more Mo exists in the oxide. 5) Regardless of the composition, the oxide lm is not simply an anhydrous oxidic substance: it is an oxyhydroxide. 11,14) Cation fractions in the surface oxide lm and the nominal composition of the alloy in atomic percentages are summarized in Table 4.…”

Section: Detected Elements and Chemical Statesmentioning

confidence: 99%

“…In the previous study, a large amount of OH − was detected. 5,22) This property may induce a high reactivity with molecules containing positive charge. More poly(ethylene glycol) terminated with amines are immobilized on a F75 CoCr alloy than 316L type stainless steel and grade 2 Ti, because of large OH − concentration on the surface.…”

Section: Surface Oxide Lm On Co-cr-mo Alloysmentioning

confidence: 99%

“…In Co-Cr-Mo alloys, the oxide lm consists of oxides of Co and Cr without Mo, 4) in contrast, when the alloy polished mechanically in de-ionized water, the oxide lm consists of oxide species of Co, Cr and Mo with a thickness of approximately 2.5 nm. 5) This surface lm contains a large amount of OH − , i.e., the hydrated or oxyhydroxidized oxide and can also traced Cr 0 and Mo 0 distributed at the inner layer of the lm. The corrosion was found to proceed by selective dissolution of the Co in neutral or acidic solutions.…”

Section: Introductionmentioning

confidence: 99%

“…6) During immersion of Co-Cr-Mo alloys in Hanks solution, culture medium and cell culture, Co dissolves from the lm, and the lm composition changes to mostly comprise chromium oxide with a small amount of molybdenum oxide with formation of calcium phosphate on or in the lm. 5) After the alloy is anodically polarized in Hanks solution in a passive range, the surface oxide lm consists predominantly of Cr 2 O 3 and Cr(OH) 3 with a thickness of 3.1 nm. 7) In another study, a Cr-enriched and Co-depleted passive layer formed on the alloy.…”

Section: Introductionmentioning

confidence: 99%

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Surface Composition and Corrosion Resistance of Co-Cr Alloys Containing High Chromium

et al. 2016

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Air-formed surface oxide lms on four types of Co-Cr-alloys were characterized using X-ray photoelectron spectroscopy (XPS) and ve types of Co-Cr alloys were anodically polarized, to identify the effects of the addition of N, Mo, and W to Co-Cr alloys containing high Cr on the surface composition and corrosion resistance. Co-20Cr-15W-10Ni (ASTM F90), Co-30Cr-6Mo, Co-33Cr-5Mo-0.3N, and Co-33Cr-9W-0.3N were employed for XPS and the above four alloys and another Co-30Cr-6Mo (ASTM F75) were employed for anodic polarization. . Cr and Mo are enriched and Co and Ni are depleted in the surface oxide lm. W was enriched in the case of Co-20Cr-15W-10Ni but depleted in the case of Co-33Cr-9W-0.3N. On the other hand, Cr, Mo, W and Ni were enriched and Co was depleted in the substrate alloy just under the surface oxide lm in the polished alloy. During rapid formation of the surface oxide lm, Cr was preferentially oxidized and the oxidation of Co and Ni delayed, according to the oxidation and reduction potentials of these elements. The Co-Cr alloys essentially have high localized corrosion resistance that is not easily affected by a small change of composition. Co-33Cr-5Mo-0.3N shows higher corrosion resistance compare than conventional Co-Cr alloys.

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Localized Corrosion Resistance of Co‐Cr Alloy in NaCl Solution

Suzuki¹,

Noda²,

Tsutsumi³

et al. 2013

Pricm

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Characterization of the surface oxide film of a Co–Cr–Mo alloy after being located in quasi-biological environments using XPS

Cited by 253 publications

References 22 publications

Microstructures of Zr-Added Co-Cr-Mo Alloy Compacts Fabricated with a Metal Injection Molding Process and Their Metal Release in 1 mass% Lactic Acid

Microstructures of Zr-Added Co-Cr-Mo Alloy Compacts Fabricated with a Metal Injection Molding Process and Their Metal Release in 1 mass% Lactic Acid

Surface Composition and Corrosion Resistance of Co-Cr Alloys Containing High Chromium

Localized Corrosion Resistance of Co‐Cr Alloy in NaCl Solution

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