Atmospheric Corrosion of Painted Galvanized and 55%Al-Zn Steel Sheets: Results of 12 Years of Exposure

Table 1

Mean thicknesses (μm).

Metal/paint system	Metallic coating	Primer	Topcoat	Total thickness
S/Z/AS	18±0.9	22±0.9	52±2.6	92±4.5
S/ZA/AS	20±0.9	22±0.9	52±2.6	94±4.5
S/Z/ES	18±0.9	4±0.2	87±2.6	109±5.1
S/ZA/ES	20±0.9	4±0.2	87±2.6	111±5.1
S/Z/PS	18±0.9	4±0.2	48±2.6	70±3.5
S/ZA/PS	20±0.9	4±0.2	48±2.6	72±3.5

Note: S/Z/AS: galvanized steel/alkyd-based paint system; S/ZA/AS: steel/55%Al-Zn alloy/alkyd-based paint system; S/Z/ES: galvanized steel/epoxy-based paint system; S/ZA/ES: steel/55%Al-Zn alloy/epoxy-based paint system; S/Z/PS: galvanized steel/polyurethane-based paint system; S/ZA/PS: steel/55%Al-Zn alloy/polyurethane-based paint system.