Ingeniero Mecánico Electricista

Hot-Dip Galvanized Steel vs. Paint
Hot-Dip Galvanized Steel No No Factory No Newly galvanized -75°F to 392°F Cathodic & Barrier > 3.9 mils (1/4” thick steel) 3600 psi 179 to 250 DPN 75 Years

vs.Special Handling F i e l d Touch-up Application We a t h e r Dependent Te m p e r a t u r e Range Corrosion Protection Coating T h i c k n e s s Bond Strength Hardness/Abrasion R e s i s ta n c eService Life Atmospheric

Paint Paper interleve, cloth slings, wood separators Required Field or Factory Yes < 200°F Barrier Variable 300-600 psi Varies by Type 12-15 Years 4 years later1 Newly painted30 years later

Initial and Maintenance Cost Analysis2
YEARS
C O AT I N G SYSTEM
Galvanized Steel IOZ Primer/ HB Epoxy IOZ Primer/ Waterborne Acrylic IOZ Primer/ HB Epoxy/ Acrylic UrethaneLatex/Latex/Latex

0
$1.67 $1.99 $1.89

5

10

15

20

25

30

TO TA L N P V 3 $ / ft 2
$1.67

$0.31 Touch-up $0.33 Touch-up

$0.41 Maint. Repaint

$2.71 $3.24 $0.43 Maint.Repaint

$0.46 Maint. Repaint $0.34 Touch-up

$2.62

$3.39

$1.95

$0.74 $0.47 Touch-up Maint. Repaint

$1.07 Full Repaint

$0.19 Touch-up

$0.20 Maint. Repaint

$4.71

1Representativeof expected results. 2This table represents a practical maintenance cycle in a moderate industrial environment. It also represents a 250-ton project of typical size/shape, and a 30-year plannedservice life. The paint costs are based on a conventional spray, SP6 surface preparation in an eastern U.S. exposure. Source: NACE 98 Paper #509, Costing Considerations For Maintenance and New ConstructionCoating Work. 3Net Present Value

American Galvanizers Association

Phone: 720-554-0900

Fax: 720-554-0909

www.galvanizeit.org

aga@galvanizeit.org

Performance Notes
Special Handling •The zinc-iron alloy layers of the hot-dip galvanized (HDG) steel coating are harder than steel and are unaffected by rough handling typical during shipment and erection. Banding of HDG steel pieces...