Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 716, Issue -, Pages 73-80Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.05.036
Keywords
Capillarity; Spreading dynamics; Coating
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Wetting of Sn/Al and Sn/low carbon steel systems, for the typical dissolutive and reactive wetting systems, were studied at 350-450 degrees C under high vacuum. In Sn/Al system, the dissolution of Al into Sn cannot decrease the liquid/solid interface tension but break the bonding between oxide film and substrate, and then improve wettability. In Sn/low carbon steel system, the wetting behavior has two stages (non-linear and linear stages), and can be described by the well-established RPC model. The wetting activation energies are 24.6 kJ/mol and 26.1 kJ/mol for these two stages, respectively, which are corresponding to the dissolution-precipitation mechanism at interface, i.e., the dissolution of Fe and the precipitation of FeSn2. The precursor film is a typical characteristic for the wetting of metal/metal reactive system, and can be explained by the subcutaneous infiltration mechanism (for the situation that the substrate was covered with oxide film). (C) 2017 Elsevier B.V. All rights reserved.
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