Influence of calcium hydroxide and anodic solution temperature on corrosion property of anodising coatings formed on AZ31 Mg alloys

Authors: Salman, S.; Ichino, R.; Okido, M.

Source: Surface Engineering, Volume 24, Number 3, May 2008 , pp. 242-245(4)

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Abstract:

Anodisation of AZ31 Mg alloy (3 mass%Al, 1 mass%Zn) was performed in 1M NaOH solution, with and without adding 35 mM of calcium hydroxide at various temperatures. The anodising process was carried out at constant potential 3 V; the change in current density during the first period of anodising revealed the mechanisms of anodic film formation. Adding 35 mM Ca(OH)₂ to the solution improved the corrosion resistance, e.g. in 17 mM NaCl and 0·1M Na₂SO₄ solution at 298 K from anodic polarisation measurements. The anodic layer thickness increases with the amount of Ca(OH)₂ added. The temperature of the solution also affects the anodising process; i.e. increasing the solution temperature improved the corrosion resistance of the anodised film.

Keywords: AZ31 MAGNESIUM ALLOY; ANODISING; NAOH SOLUTION; CORROSION RESISTANCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174329408X282578

Publication date: 2008-05-01

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