Hydrogen entry behaviour of hot-dip Al–Mg–Si coated steel

Effect of Corrosion Product on the Electrochemical Behavior of Zn, Zn-Al and Al-Mg-Si Alloy Coated Steel

“…In order to make surface diffusion high enough, the substrate was heated at about 100°C. 3 A Traditional hot-dip zinc galvanized steel (Zn) and galvalume (Zn-55Al) with coating thickness about 20 µm were used for comparing this new coating.…”

“…In case of aluminum, progressive increase in the amount of dissolution is detected during long time of immersion. It could be concluded that at the beginning of the immersion, magnesium preferentially dissolve, the oxide layer properties are essentially controlled by the magnesium oxide (or hydroxide) component but the formation of Mg(OH) 2 and Al(OH) 3 goes on side by side. For long immersion time, when an aluminum concentration threshold is reached, it is assumed that the oxide layer become more predominantly determined by alumina component, whose passivating characteristics are greater than those of Mg(OH) 2 .…”

“…There is no enhancement of oxygen diffusion limiting current. It is supposed that the inhibition of oxygen reduction was connected to better insulating properties of the Al-based protective film as oxide or hydrated oxide (i.e., Al(OH) 3 or AlOOH). Oxygen diffusion limiting current for 24 h immersion shown in Fig.…”

Effect of Scratching of Coating Surface on the Electrochemical Behavior of PVD Al-Mg-Si Coated Steel

“…The as-deposited Al-Mg-Si coating produced by PVD has typically a primary A-Al solid solution which is supersaturated with Mg and Si as reported by Kyo et al for Al-Mg coating. 3 The electrochemical cell consists of the Al-Mg-Si coating as a working electrode, a saturated KCl/AgCl/Ag (SSE) as a reference electrode and platinum (Pt) as a counter electrode. All the potentials described in this paper were referred to saturated silver-silver chloride electrode (SSE).…”

“…The results from this investigation were basic data collecting for conventional hot dipped process. 18 …”