Effect of Relative Humidity on the Tribological Properties of Self-Lubricating H₃BO₃ Films Formed on the Surface of Steel Suitable for Biomedical Applications

Figure 11

SEM micrographics of the annealed samples at conditions of (a) 20%, (b) 40%, (c) 60%, (d) 75%, and (e) 85% of RH.

(a)

(b)

(c)

(d)

(e)