Journal article 1264 views 154 downloads
Studies of inherent lubricity coatings for low surface roughness galvanised steel for automotive applications
Donald Hill,
Peter Holliman 
,
James McGettrick ,
Justin Searle,
Marco Appelman,
Pranesh Chatterjee,
Trystan Watson ,
David Worsley
,
James McGettrick ,
Justin Searle,
Marco Appelman,
Pranesh Chatterjee,
Trystan Watson ,
David Worsley
Lubrication Science
Swansea University Authors:
Peter Holliman , James McGettrick , Trystan Watson , David Worsley
-
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DOI (Published version): 10.1002/ls.1370
Abstract
Surface lubricity on TiO2-coated galvanised steels can be controlled by solution depositing perfluorooctanoic (C8), lauric (C12) or stearic (C18) acids to avoid lubricating oils/emulsions or substrate pre-etching to remove surface oxide that add cost and waste. Water contact angles reveal increased...
| Published in: | Lubrication Science |
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| ISSN: | 0954-0075 |
| Published: |
2017
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa31547 |
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| Abstract: |
Surface lubricity on TiO2-coated galvanised steels can be controlled by solution depositing perfluorooctanoic (C8), lauric (C12) or stearic (C18) acids to avoid lubricating oils/emulsions or substrate pre-etching to remove surface oxide that add cost and waste. Water contact angles reveal increased surface hydrophobicity on coated samples that correlate with linear friction testing, suggesting water contact angle can be used to screen lubricity compounds. Linear friction testing shows that C12 and C18 lower the coefficient of friction (μ) by 50–60% compared with uncoated substrates whilst C8 drops μ from 0.31 to 0.22. Surfaces have been characterised by X-ray photoelectron spectroscopy, scanning electron microscopy and atomic force microscopy, whilst infrared confirms that as-deposited coatings contain physisorbed and deprotonated acids chemisorbed through esters and thermal gravimetric analysis confirms increasing loadings from C8 to C12 to C18. Surface washing removes physisorbed material and lowers μ by increasing surface organisation and alkyl chain packing that enhances frictional energy dissipation through steric quenching. |
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| Keywords: |
lubricity; friction; sorption; automotive steel; sheet metal forming |
| College: |
Faculty of Science and Engineering |