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Low adhesion due to oxide formation in the presence of NaCl
KTH, School of Industrial Engineering and Management (ITM).ORCID iD: 0000-0003-2489-0688
2012 (English)In: 9th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, CM 2012, 2012, 309-317 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper outlines work carried out to assess how adhesion may be influenced by contamination of the rail head with salt/grit from level crossings during winter months when they are applied to the road surfaces as a preventative method to stop ice formation. Twin-disc testing was carried out in which a mechanically formed oxide layer was produced on the disc specimens prior to assessing adhesion levels under realistic contact pressures and slips in the following conditions: dry, wet, dry salt, and two salt-water solutions. Under dry conditions adhesion levels differ little from reference tests without an oxide layer, however, the presence of an oxide layer under wet conditions can be seen to further reduce adhesion from a reference level (0.2) to below 0.1. When NaCl is entrained into the contact it increases adhesion levels above that seen under wet conditions in the presence of an oxide layer, however, the presence of NaCl is most likely to affect the generation of rail head oxides in the first place and in turn influence adhesion.

Place, publisher, year, edition, pages
2012. 309-317 p.
Keyword [en]
Deformation, Rails, Contact pressures, Disc specimens, Ice formations, Level crossing, Oxide formation, Reference levels, Wet conditions, Winter months, Adhesion
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-167654Scopus ID: 2-s2.0-84897472634OAI: oai:DiVA.org:kth-167654DiVA: diva2:816839
Conference
9th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, CM 2012, 27-30 August 2012, Chengdu, China
Note

QC 20150603

Available from: 2015-06-04 Created: 2015-05-22 Last updated: 2015-06-04Bibliographically approved

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Olofsson, Ulf

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