Effects of Surface Pretreatment on Polyetheretherketone with Sulfuric Acid on Microhardness and Microscopic Morphology
Objectives: The purpose of this study was to investigate the effects of surface pretreatment with sulfuric acid at different concentrations on microhardness and microscopic morphology of polyetheretherketone.
Methods: Fourty specimens of Polyetheretherketone (5×5×2 mm3) were embedded in a metal ring diameter 18 mm, height 10 mm with an autopolymerizing acrylic resin. The specimens were polished with P400, P800, P1200 and P2000 grit silicon carbide papers. The specimens were divided into 5 surface retreatment groups (n=8): control group (no surface pretreatment), 70% sulfuric acid, 80% sulfuric acid, 90% sulfuric acid and 98% sulfuric acid, respectively. Sulfuric acid was applied 1 min to each surface. After etching, the specimens were rinsed thoroughly with deionized water and ultrasonically cleaned for 10 min. Subsequently, all specimens were dried at room temperature before Vickers microhardness test and scanning electron microscopy analysis on the surface of specimens. One-way ANOVA following by Tukey’s multiple comparisons were tested (p<0.05).
Results: The group of 98% sulfuric acid pretreatment showed the statistically significantly lowest Vickers microhardness (8.08 Mpa). The group of 70%, 80% and 90% sulfuric acid presented 25.12, 25.62 and 24.58 Mpa, respectively. The pretreatment Polyetheretherketone with 70%, 80% and 90% sulfuric acid showed microscopic morphology of surfaces with increasing pits and pores, respectively. Fiber-like frameworks were distributed throughout the surfaces in the 98% sulfuric acid etching group.
Conclusions: Within the limitation of this study, it can be concluded that surface pretreatment with 98% sulfuric in 60 s highly corroded of Polyetheretherketone surface, which affected the lowest Vickers microhardness.
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