Interface and volume transport on technical cataphoretic painting: A comparison of steel, hot-dip galvanised steel and aluminium alloy

摘要: Abstract Water diffusion through the polymer and ion transport along coating-metal interface is examined on steel, hot-dip galvanised steel (HDG) AlMg(Mn) with clear pigment cataphoretic paintings (E-coats). A general velocity decrease identified from to HDG via extensive impedance studies combined force modulation analyses. The matrix reveals a slight Young ’ s modulus drop an increased disorder in pigment-polymer network rough substrates after 50 days of salt-water uptake. Further signs plasticising are not observed but these circumstances already require Non-Fickian approach. During film formation, substrate dissolves due extreme cathodic polarisation under high alkaline conditions, which why E-coat contaminated by solvated metal zinc aluminium – contrary expectations its highest contamination steel. Kelvin Probe data illustrates prominent differences between interfaces as well concentration- und substrate-effects humid oxygen-deficient conditions. Additionally, interfacial bonding properties oxide used assess pH-activities during sub-surface flux complete this comprehensive study about dependencies.