Elements determination in viscous lubricants


Elements determination in viscous lubricants

Most of additives used while viscous lubricants production contain metal-organic compounds. Therefore monitoring of the elements is required both while production and application. Some foreign substances can penetrate into lubricant while usage, that can spoil the lubricant properties. Besides that some particles of the operating parts may penetrate in lubricant, therefore wear-out may be monitored.
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The following elements can be included in additives: Zn, P, Ca, S, Mg, Ba, Sr, Mo, Cu. Their quantity is sufficient to be determined with XRFA directly without any sample preparation.

Elemental composition can be monitored at the production stage for composition control, as well as for wear-out control of friction units by determination of metal content in lubricant.
Boxol analysis in journal box bearings of locomotives is and example. Fe, Cu, Cr and Si are determined. High Si content indicates leakage in the bearings and requires lubricant change. High content of Fe, Cu, Cr  indicates of the bearing wear-out.

Element content determination is direct: sample cup with analyzed material is covered with polyethyleneterephtalate film and analyzed in a spectrometer.

"SPECTROSCAN MAKC-GVM" WDXRF spectrometer determines elements from Na (Sodium) to U (Uranium) in solids, liquids or powders, in solutions and thin films, deposits on filters. 

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Wavelength dispersive X-ray fluorescent WDXRF scanning spectrometer for determination of chemical elements in the range from Ca (Calcium) to U (Uranium) in various compounds.

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