Desorption of carboxylates and phosphonates from galvanized steel: Towards greener lubricants |
| |
| Authors: | Donald Hill Peter J Holliman Eurig W Jones James McGettrick David A Worsley Marco Appleman Pranesh Chatterjee |
| |
| Institution: | 1. College of Engineering, Bay Campus, Swansea University, Swansea, UK;2. Tata Steel Research and Development, Ijmuiden, The Netherlands |
| |
| Abstract: | This paper studies the removal of chemisorbed carboxylates and phosphonates from TiO2-coated galvanized steel using NaOH(aq). XPS and FTIR data show that NaOH(aq) is effective at desorbing these species and so is an alternative to gas phase processes (eg, plasma cleaning). Tribological investigations show that NaOH(aq)-treated surfaces show reduced friction and wear, relative to the “as-received” galvanized steel. This is ascribed to carbonate (present as an impurity in NaOH) that adsorbs to the surface of the substrate during NaOH(aq) immersion. Carbonate removal through sonication in water generates surfaces that show friction similar to “as-received” galvanized steel. This work is useful in areas (eg, automotive manufacturing), where the effective removal of lubricants following tribological contact is key to subsequent paint adhesion. |
| |
| Keywords: | carbonate inherent lubricity plasma cleaning surfaceswear |
|
|
