Auger electron spectroscopy has been used to determine surface concentrations of Mo in Types 304 and 316 stainless steel. The technique involved was Ar+ bombardment removal of the stainless surface with alternate monitoring of the height of the 190 eV Mo peak. Surface concentrations of 14% were observed in mill‐finished Type 316 containing 1.95% bulk Mo. Surface segregation of Mo was also observed in Type 304 containing 0.45% Mo impurity.
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