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. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: J Mech Behav Biomed Mater. 2013 Sep 3;29:10.1016/j.jmbbm.2013.08.018. doi: 10.1016/j.jmbbm.2013.08.018

Table 3.

Surface roughness parameters (Ra and rms values) before and after corrosion exposure

Material Before testing After testing
Sample Ra / μm Ra /μm
Bulk-like (HC) 0.033 ± 0.005 0.424 ± 0.066
Nano-crystalline (HC) 0.004 ± 0.0001 0.207 ± 0.165
Tribolayer (HC) 0.018 ± 0.006 0.444 ± 0.034
Bulk-like (LC) 0.015 ± 0.001 0.126 ± 0.014
Nano-crystalline (LC) 0.004 ± 0.00003 0.170 ±0.010
Tribolayer (LC) 0.0107 ± 0.002 0.117 ± 0.010

HC: high carbon, LC: Low carbon, Ra: Roughness parameter