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Desorption of carboxylates and phosphonates from galvanized steel: Towards greener lubricants
Author(s) -
Hill Donald,
Holliman Peter J.,
Jones Eurig W.,
McGettrick James,
Worsley David A.,
Appleman Marco,
Chatterjee Pranesh
Publication year - 2019
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6681
Subject(s) - galvanization , tribology , materials science , contact angle , x ray photoelectron spectroscopy , carbonate , metallurgy , impurity , adhesion , sonication , desorption , adsorption , chemical engineering , chemistry , composite material , layer (electronics) , organic chemistry , chromatography , engineering
This paper studies the removal of chemisorbed carboxylates and phosphonates from TiO 2 ‐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.