Identification and development of a new local corrosion mechanism in a Laser Engineered Net Shaped (LENS) biomedical Co-Cr-Mo alloy in Hank’s solution

Narayanan, Deeparekha; Liu, Mengmeng; Kuttolamadom, Mathew; Castaneda, Homero

doi:10.1016/j.corsci.2022.110599

Cited by 12 publications

(3 citation statements)

References 76 publications

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“…It can also be noted that while the compositional differences obtained from the TEM-EDS point scans did not seem significant, the enrichment of the Cr/Mo at the boundaries made a significant impact on the Volta potential difference. Since Mo is galvanically more noble than Fe (comparing their position in the electrochemical series) and Cr/Mo are the main passivating elements, the depletion of these elements in the cell interiors and MPBs makes them more prone to attack 36 – 38 . Electrochemically, the observation of such Volta potential differences leads to the formation of micro-galvanic cells, which causes a preferential attack of the more anodic regions when the passive film breaks down upon exposure to a corrosive environment.…”

Section: Resultsmentioning

confidence: 99%

Localized corrosion in selective laser melted SS316L in CO2 and H2S brines at elevated temperatures

Narayanan,

Martinez,

Martin

et al. 2024

npj Mater Degrad

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In this work, the passivation and localized corrosion of selective laser melted (SLM) stainless steel 316 L when exposed to high pressures of CO2 with the presence of H2S and Cl− at 25 °C and 125 °C were studied. Depletion of Cr/Mo was observed at the cell interiors and melt-pool boundaries (MPBs) compared to the cell boundaries. Volta potential differences obtained from scanning Kelvin probe force microscopy (SKPFM) showed that the MPBs were 8–20 mV lower than the matrix, while the cell interiors were 20–50 mV lower than the cell boundaries. Electrochemical impedance spectroscopy (EIS) and Mott–Schottky tests indicated a more defective passive film at 125 °C, and X-ray photoelectron spectroscopy (XPS) confirmed the formation of a less protective film with an increased S/O ratio at 125 °C than 25 °C. Initiation of localized corrosion was observed at the MPBs and pits formed after a week of immersion were wider by an order of magnitude at 125 °C than 25 °C, with evidence of cell-interior dissolution. While passivity was observed even at elevated temperatures, local chemical heterogeneities compromised the stability of the film and contributed to localized corrosion in SLM SS316L.

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Section: Resultsmentioning

confidence: 99%

Localized corrosion in selective laser melted SS316L in CO2 and H2S brines at elevated temperatures

Narayanan,

Martinez,

Martin

et al. 2024

npj Mater Degrad

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“…Dental implants provide numerous advantages, such as enhanced oral health, improved pronunciation and chewing, preservation of adjacent teeth and bones, and an overall improvement in quality of life. Regarding the materials, metal alloys, including stainless steel, cobalt-chromium alloy, and titanium-based alloy, are typically utilized for dental implants [3][4][5][6][7]. Titanium alloys are widely acknowledged as the optimal materials for implants due to their ability to strike a balance between mechanical performance and biological compatibility, ensuring the success and longevity of medical implants [3].…”

Section: Introductionmentioning

confidence: 99%

Titanium Surface Modification Techniques to Enhance Osteoblasts and Bone Formation for Dental Implants: A Narrative Review on Current Advances

Tuikampee,

Chaijareenont,

Rungsiyakull

et al. 2024

Metals

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Surface modifications for titanium, a material of choice for dental implants, can greatly alter the surface micro/nanotopography and composition of implants, leading to notable enhancements in their hydrophilicity, mechanical properties, osseointegration performance, and antibacterial performance, as well as their impacts on osteoblast activity and bone formation processes. This article aims to update titanium surface modification techniques for dental implants from the past to the present, along with their effects on osteoblasts and bone formation, by thoroughly summarizing findings from published studies. Peer-reviewed articles published in English consisting of in vitro, in vivo, and clinical studies on titanium dental implant surface treatments were searched in Google Scholar, PubMed/MEDLINE, ScienceDirect, and the Scopus databases from January 1983 to December 2023 and included in this review. The previous studies show that implant surface roughness, condition, and hydrophilicity are crucial for osteoblast adhesion and growth. While various techniques enhance osseointegration comparably, one of the most common approaches to accomplishing these properties is sandblasting large-grit acid etching surface treatment and coating with hydroxyapatite or chitosan. In conclusion, this review points out the efficacy of different subtraction and addition techniques in enhancing the surface properties of titanium dental implants, promoting favorable outcomes in terms of osteoblast activity and bone formation in various degrees. However, most existing studies predominantly compare treated and non-treated titanium, revealing a need for more comprehensive studies comparing the effects of various modification techniques. Moreover, further investigation of factors playing a role in the dynamic osseointegration process in addition to osteoblasts and their functions, as well as improved surface modification techniques for the treatment of compromised patients, is greatly required.

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“…Biomedical implants are great creations in human medical history, which are widely used to save countless people from the pain of tissue loss and necrosis, especially in the restoration of hard tissues. − The application of suitable materials with good biocompatibility, matching mechanical properties, and stability is the key to developing implants. − To data, there are three typical implants in clinical applications, including stainless steel, cobalt–chromium alloy, and Ti based alloy. − As shown in Figure , the mechanical properties of medical stainless steel are quite different from those of hard tissue, making it is easy to cause implant failure. − Cobalt-based medical metal materials have excellent mechanical properties, wear resistance, and corrosion resistance, but the release of cobalt, nickel, and other metal ions in the constituent elements easily causes cell and tissue necrosis . Due to the best biocompatibility, matching mechanical properties, and good corrosion resistance, Ti alloys are recognized as the most suitable implant material. , …”

Section: Introductionmentioning

confidence: 99%

Surface Modification and Functionalities for Titanium Dental Implants

Sun,

Liu,

Wang

et al. 2023

ACS Biomater. Sci. Eng.

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Dental implants have become the mainstream strategy for oral restoration, and implant materials are the most important research hot spot in this field. So far, Ti implants dominate all kinds of implants. The surface properties of the Ti implant play decisive roles in osseointegration and antibacterial performance. Surface modifications can significantly change the surface micro/nanotopography and composition of Ti implants, which will effectively improve their hydrophilicity, mechanical properties, osseointegration performance, antibacterial performance, etc. These optimizations will thus improve implant success and service life. In this paper, the latest surface modification techniques of Ti dental implants are systematically and comprehensively reviewed. The various biomedical functionalities of surface modifications are discussed in-depth. Finally, a profound comment on the challenges and opportunities of this frontier is proposed, and the most promising directions for the future were explored.

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Identification and development of a new local corrosion mechanism in a Laser Engineered Net Shaped (LENS) biomedical Co-Cr-Mo alloy in Hank’s solution

Cited by 12 publications

References 76 publications

Localized corrosion in selective laser melted SS316L in CO2 and H2S brines at elevated temperatures

Localized corrosion in selective laser melted SS316L in CO2 and H2S brines at elevated temperatures

Titanium Surface Modification Techniques to Enhance Osteoblasts and Bone Formation for Dental Implants: A Narrative Review on Current Advances

Surface Modification and Functionalities for Titanium Dental Implants

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