期刊
TRIBOLOGY INTERNATIONAL
卷 183, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2023.108420
关键词
CoCr alloy; Solid lubricant; Wear-corrosion; Hyaluronic acid
Graphene-based solid lubricants biofunctionalized with hyaluronic acid were applied on CoCr surfaces to reduce wear-corrosion phenomena. Graphene oxide was electrochemically reduced on CoCr in a suspension of graphene oxide 4 g/L by cyclic voltammetry. Biofunctionalization was performed in phosphate buffer solution with HA 3 g/L (PBS-HA) for 24 h. Tribocorrosion tests were conducted using a pin-on-disk tribometer with an integrated cell, applying a normal load of 1 N, 120 rpm for 500 m, in both PBS and PBS-HA. The coefficients of friction in PBS were higher than those in PBS-HA. ErGO and HA-ErGO increased the wear rate in AISI316 balls, indicating that ErGO hardened the CoCr surface. Biofunctionalization reduced the abrasive properties of ErGO deposits.
In this work graphene-based solid lubricants biofunctionalized with hyaluronic acid were deposited on CoCr surfaces to decrease wear-corrosion phenomena. Graphene oxide was electrochemically reduced on CoCr in an aqueous suspension of graphene oxide 4 g/L by cyclic voltammetry. Biofunctionalization in phosphate buffer solution with HA 3 g/L (PBS-HA) for 24 h was performed. A pin-on-disk tribometer with an integrated cell was used for tribocorrosion tests. Wear-corrosion tests were performed against AISI316 steel balls applying normal load 1 N, 120 rpm for 500 m, in PBS and PBS-HA. Coefficients of friction in PBS were higher than in PBS-HA. ErGO and HA-ErGO increased wear rate in AISI316 balls, i.e., ErGO hardens the CoCr surface. Bio-functionalization reduces abrasive properties of ErGO deposits.
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