Effects of Sulfuric Acid Surface Pretreatment Duration on Microhardness and Microscopic Morphology of Polyetheretherketone
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Abstract
Objectives: The purpose of this study was to investigate the effect of 90% sulfuric acid surface pretreatment duration of polyetheretherketone on microhardness and microscopic morphology.
Material and methods: Forty-eight specimens of polyetheretherketone (5x5x2 mm3) were prepared by Isomet cutting matchine. The specimens were embedded in a metal ring using an auto-polymerizing acrylic resin and were polished with P400, P800, P1200 and P2000 grit silicon carbide papers. The 48 specimens were allocated to six groups of 8 specimens, according to the etching duration: 0s (control), 30s, 60s, 90s, 120s and 300s, respectively. Vicker’s microhardness and Scanning electron microscopy were tested. One-way ANOVA following by Tukey’s multiple comparisons were tested (p<0.05) subsequently.
Results: The lowest value of Vicker’s microhardness (12.51 Mpa) was presented in the group etched for 300s. The groups with 90s and 120s etching time showed the values of Vickers’s microhardness significantly lower than the control group (21.76 and 19.59 Mpa). Whereas, the Vickers microhardness for etching time 30s and 60s groups showed no significant differences with the control group (25.42 and 24.06 Mpa). An impact of etching time on surface morphology was observed in the following ascending order from 0s to 300s. Thereby, the increase of irregular surface pattern, pits and pores according to etching time were presented.
Conclusions: Surface pretreatment with 90% sulfuric acid longer than 60s have influenced the surface hardness of polyetheretherketone. The lowest value of Vickers microhardness was presented in the group etched for 300s.
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References
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