Tribocorrosion Behavior of Squid Pen‐Reinforced HDPE Biocomposites Against Ti6Al4V in Bovine Serum: Wear Mechanisms and Electrochemical Interactions

ABSTRACT The study explores the tribocorrosive behavior of biocomposites based on high‐density polyethylene (HDPE) reinforced with squid feather (SP) particles in contact with Ti6Al4V pins in a bovine serum solution. Tribocorrosion tests were carried out on biocomposites containing different mass fractions of SP (0, 5, 10, and 15 wt.%) to assess the influence of this reinforcement on wear resistance and electrochemical interactions at the composite–metal interface. The results show that the addition of 5 wt.% SP reduces the coefficient of friction by 13% and decreases the specific wear rate by 30% compared to pure HDPE, which correlates with efficient repassivation of the Ti6Al4V surface in the presence of albumin. On the other hand, the incorporation of 10 and 15 wt.% SP leads to an increase in the coefficient of friction of 4% and 44% respectively, as well as a 7% increase in the specific wear rate for 15 wt.% SP, due to a more marked de‐passivation of Ti6Al4V and an increase in surface roughness.