Interface and volume transport on technical cataphoretic painting: A comparison of steel, hot-dip galvanised steel and aluminium alloy
| Autor: | Wolfgang Bremser, M. Dornbusch, M. Reichinger |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Kelvin probe force microscope
Materials science General Chemical Engineering Drop (liquid) Metallurgy chemistry.chemical_element 02 engineering and technology Epoxy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Galvanization 0104 chemical sciences Metal chemistry.chemical_compound symbols.namesake chemistry Aluminium visual_art Electrochemistry Aluminium alloy visual_art.visual_art_medium Aluminium oxide symbols 0210 nano-technology |
| Zdroj: | Electrochimica Acta. 231:135-152 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2017.02.013 |
| Popis: | Water diffusion through the polymer and the ion transport along the coating-metal interface is examined on steel, hot-dip galvanised steel (HDG) and AlMg(Mn) with clear and pigment cataphoretic paintings (E-coats). A general velocity decrease is identified from AlMg(Mn) to HDG steel to steel via extensive impedance studies combined with force modulation analyses. The polymer matrix reveals a slight Young ’ s modulus drop and an increased disorder in the pigment-polymer network on rough substrates after 50 days of salt-water uptake. Further signs of plasticising are not observed but these circumstances already require a Non-Fickian approach. During the film formation, the substrate dissolves due to the extreme cathodic polarisation under high alkaline conditions, which is why the E-coat is contaminated by the solvated metal on zinc and aluminium and – contrary to expectations – with its highest contamination on steel. The Kelvin Probe data illustrates the prominent differences between the clear and the pigment E-coat interfaces as well as the concentration- und substrate-effects under humid oxygen-deficient conditions. Additionally, the interfacial bonding properties of the E-coat with aluminium oxide are used to assess the pH-activities during the sub-surface flux to complete this comprehensive study about the substrate dependencies. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect