Surface Chemistry of Aluminium Alloy Slid against Steel Lubricated by Organic Friction Modifier in Hydrocarbon Oil

Table 4

Contents of element on surface.

Analysis		Relative contents, atomic%
Method	Depth	Rubbed surface				Non-rubbed surface
		Al	Si	Sn	Fe	Al	Si	Sn	Fe
AES	3-4 nm	75	25	n/d	n/d	100	n/d	n/d	n/d
XPS	4 nm	82	14	2	2	91	n/d	9	n/d
SEM-EDX	1 μm	74	24	2	trace	93	4	3	n/d

n/d: not detected.
trace: less than 1%.