The effect of metallic oxide deposition on the electrochemical behaviour of Al-Zn-Mg-Sn alloy in natural tropical seawater

Yati, Mohd Subhi Din; Derman, Mohd Nazree; Isa, M. C.; Ahmad, Musheer; Yusoff, Nurul Huda; Muhammad, Mustafa; Nain, H

doi:10.1088/1757-899x/60/1/012051

Cited by 2 publications

(1 citation statement)

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“…The activating role of Mg in Al and Al alloys is related to the formation of intermetallic compounds such as MgZn 2 , Mg 2 Sn, and Mg 2 Si which act as corrosion centers. 30,[44][45][46][47][48][49][50][51][52][53][54] The potential of the element inserted in the Mg-rich particles can be anodic (such as Zn)…”

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Development of Al-5%Zn-0.5%Sn-2.6%Mg Alloy as Sacrificial Anode for Cathodic Protection of Steel in 3 wt.% NaCl Solution

Oulmas

Mameri

Boughrara

et al. 2021

J. Electrochem. Soc.

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In this work, two aluminum alloys, Al-5Zn-0.5Sn and Al-5Zn-0.5Sn-2.6Mg, were prepared by melting in an induction furnace to be used as sacrificial anodes for cathodic protection of marine structures. The alloys are characterized by scanning electron microscopy mapping coupled to energy dispersive X-ray analysis, X-ray photoelectron spectroscopy and X-ray diffraction. Afterwards, the corrosion behavior was studied in 3 wt.% NaCl solution through immersion tests, potentiodynamic polarization, electrochemical impedance spectroscopy and weight-loss measurements. Results display that active dissolution of Al-5%Zn-0.5%Sn-2.6%Mg alloy and its quasi-uniform corrosion is associated with the major precipitates MgZn2 and Mg2Sn particles formed during the melting process. Galvanic coupling measurements over 45 d were carried out on both alloys. The sacrificial cathodic protection of both anodes was successful but the couple efficiency was greater for Al-Zn-Sn-Mg owing to its more negative corrosion potential and uniform dissolution.

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