Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 71, Issue -, Pages 1079-1085Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2016.11.022
Keywords
Cu-bearing stainless steel; Mechanical properties; Corrosion resistance; Antibacterial performance
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Funding
- National Natural Science Foundation of China [51371168, 51501188]
- National Key Research and Development Program of China [2016YFB0300205]
- State Key Program of National Natural Science of China [51631009]
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The effects of addition of different Cu content (0, 2.5 and 3.5 wt%) on mechanical properties, corrosion resistance and antibacterial performance of 316L austenitic stainless steel (SS) after solution and aging treatment were investigated by mechanical test, transmission electron microscope (TEM), X-ray diffraction (XRD), electrochemical corrosion, X-ray photoelectron spectroscopy (XPS) and antibacterial test. The results showed that the Cu addition and heat treatment had no obvious influence on the microstructure with complete austenite features. The yield strength (YS) after solution treatment was almost similar, whereas the aging treatment obviously increased the YS due to formation of tiny Cu-rich precipitates. The pitting and protective potential of the solution treated Cu-bearing 316L SS in 0.9 wt% NaCl solution increased with increasing Cu content, while gradually declined after aging, owing to the high density Cu-rich precipitation. The antibacterial test proved that higher Cu content and aging were two compulsory processes to exert good antibacterial performance. The XPS results further indicated that aging enhanced the Cu enrichment in passive film, which could effectively stimulate the Cu ions release from the surface of passive film. (C) 2016 Elsevier B.V. All rights reserved.
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