Corrosion Products of Hot-dip Zn-6%Al-3%Mg Coated Steel Sheet Subjected to Atmospheric Exposure

Effect of Mg on the Microstructure and Corrosion Resistance of the Continuously Hot-Dip Galvanizing Zn-Mg Coating

“…In recent years, hot-dip galvanizing Zn coatings containing Mg, referred to as a promising next generation of Zn-based coatings, have received considerable attention, primarily due to their superior corrosion resistance with respect to GI (Zn-0.20 wt % Al) coating [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ] or Zn-Al coatings [ 8 , 9 ].…”

“…For Zn-Al-Mg coatings with high Al, the role of Al is to impede the oxidation of Zn liquid and enhance corrosion resistance. The conventional continuously hot-dip galvanizing technique was applied to mass-produce this type of Zn based coatings [ 3 , 4 , 5 , 8 , 9 , 10 , 11 , 12 ]. For Zn-Al-Mg coatings with very low Al or without Al, hereafter referred to as Zn-Mg coatings, other techniques, such as physical vapor deposition (PVD) [ 7 , 13 , 14 ], batching galvanizing [ 6 , 15 ], electrodeposition (EG) [ 16 , 17 , 18 ], and the two-step method [ 2 ], were selected to produce these Zn-based coatings to avoid interference of the oxidation of Mg with production.…”

Electrodeposition of Zn-Mg Alloy in Ethylene Glycol-ZnCl2-MgCl2 Non-Aqueous Solution

“…Concerning the effect of Mg addition to Zn plating, the followings are considered and suggested to be factors (4,5,22,23): the cathodic reaction of corrosion reaction is suppressed on the Zn-Mg alloy plated steel; Mg is dissolved and incorporated into ZnCl 2 ･4Zn(OH) 2 in the beginning of corrosion; the fineness and smoothness of corrosion product. Although the further investigation is necessary for understanding the role of Mg on the improvement of corrosion resistance, the excellent corrosion resistance of the ZnMg plating is due to the fact that Mg suppresses the change in the initial corrosion product, ZnCl 2 ･4Zn(OH) 2 ･H 2 O, to ZnO and/or the direct formation of ZnO.…”

Electrodeposition of Composites of Zinc with Vanadium Oxide from Sulfate Solutions

“…Investigations of Zn alloy films produced by hot-dip galvanization and dry-process coating have shown that the alloying elements less noble than Zn, such as Mg, Al, or Ti, improve the corrosion resistance of Zn alloy films. [4][5][6][7][8][9][10][11][12][13] These lessnoble metals are naturally present in rocks and cannot therefore be regarded as environmental pollutants. V (the standard single-electrode potential E 0 ϭϪ1.186 V vs. NHE) is a considerably less noble metal than Zn (E 0 ϭϪ0.76 V), and therefore expected to improve the corrosion resistance of Zn alloy films.…”