Wear testing, cobalt-base alloys

In evaluating the cobalt-base alloys in a wear sense, several ASTM standards, most involving room temperature tests, have been employed. Among these are ... 

In summary, by corrosion and wear testing the cobalt-base alloys according to the procedures described in ASTM standards G 31, G 32, G 36, G 48, G 65, and G 98, it is possible to determine their suitability for many industrial situations. In general, the alloys are characterized by their carbon contents, the low-carbon alloys being generally much more corrosion-resistant and ductile than the high-carbon alloys. 

As already mentioned in Section 8.2.2, there are some concerns over the use of Co-Cr-Mo alloy based joints due to the nanosized metallic wear particles (Jacobs et al, 1998 Tipper et al., 2001). The size and quantum of these wear particles could influence the tribocorrosion behavior. The effect of cobalt nanoparticles (average diameter 28 nm) on the biotribocorrosion behavior of wrought Co-Cr-Mo alloy hip prostheses (36 mm diameter hips) was studied by Yan et al. (2009). BS (25%, v/v) and 0.3% NaCl (5 ml for each test) were employed as lubricants in... 

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