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Duplex stainless steels for osteosynthesis devices.

A Cigada1, G Rondelli, B Vicentini

  • 1Dipartimento di Chimica Fisica Applicata, Politecnico di Milano, Italy.

Journal of Biomedical Materials Research
|September 1, 1989
PubMed
Summary
This summary is machine-generated.

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Duplex stainless steels offer superior corrosion resistance compared to austenitic stainless steels for osteosynthesis devices. High-performance 25Cr-7Ni-4Mo-N duplex stainless steel is resistant to crevice corrosion in the human body.

Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Corrosion Science

Background:

  • Austenitic stainless steels, commonly used for osteosynthesis devices, exhibit susceptibility to crevice corrosion.
  • Developing materials with enhanced corrosion resistance is crucial for improving the longevity and safety of orthopedic implants.

Purpose of the Study:

  • To evaluate and compare the corrosion properties of selected duplex stainless steels against traditional austenitic stainless steels.
  • To identify potential advanced materials for osteosynthesis devices with improved performance.

Main Methods:

  • Comparative corrosion property evaluation of various stainless steel grades.
  • Assessment of crevice corrosion resistance in simulated physiological environments.
  • Mechanical property comparison under equivalent cold working conditions.

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Main Results:

  • A corrosion resistance ranking was established: 23Cr-4Ni < AISI 316L < ASTM F138 < 22Cr-5Ni-3Mo < 27Cr-31Ni-3.5Mo < 25Cr-7Ni-4Mo-N.
  • The 25Cr-7Ni-4Mo-N duplex stainless steel demonstrated exceptional resistance to crevice corrosion.
  • Duplex stainless steels exhibited superior mechanical properties compared to austenitic grades at similar cold working levels.

Conclusions:

  • The 25Cr-7Ni-4Mo-N duplex stainless steel is a promising candidate for orthopedic and osteosynthesis applications due to its excellent corrosion resistance and mechanical strength.
  • This high-performance duplex stainless steel can be considered a viable substitute for ASTM F138 in medical implants.
  • Further research into duplex stainless steels could lead to next-generation biomaterials for bone fixation.