Fig. 7. i–v (a and b) FESEM micrographs and i–v (c) elemental analysis EDX spectra of the worn out steel balls lubricated with (1) 50 ppm (2) 100 ppm (3) 150 ppm and (4) 200 ppm of SBC. [i–v (b) shows FESEM images at higher magnifications].
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