Results of corrosion resistance comparison with post hot-dip zinc-coated steel sheets

Corrosion resistance comparison with post hot-dip zinc-coated steel sheets (HDZ55: JIS H8641)

With only 1/6 of the coating weight of post hot-dip zinc-coated steel sheets, ZAM® exhibits corrosion resistance equal to or better than theirs. The following examination certifications admit that ZAM® may replaceposthot-dip galvanized steel.

・Construction technology examination certification (building technology) Building Center of Japan
・Construction technology examination certification Public Works Research Center

Appearances of flat parts after salt spray test

500h ZAM® Thickness: 2.3 mm 90/90 g/m2 — Lapse of time: 500h

1000h ZAM® Thickness: 2.3 mm 90/90 g/m2 — Lapse of time: 1,000h

2000h ZAM® Thickness: 2.3 mm 90/90 g/m2 — Lapse of time: 2,000h

4000h ZAM® Thickness: 2.3 mm 90/90 g/m2 — Lapse of time: 4,000h

ZAM® Thickness: 2.3 mm 90/90 g/m2

Reference scale: 20mm

500h Post hot-dip galvanized product (HDZ55) Thickness: 2.3 mm 560/560 g/m2 — Lapse of time: 500h

1000h Post hot-dip galvanized product (HDZ55) Thickness: 2.3 mm 560/560 g/m2 — Lapse of time: 1,000h

2000h Post hot-dip galvanized product (HDZ55) Thickness: 2.3 mm 560/560 g/m2 — Lapse of time: 2,000h

4000h Post hot-dip galvanized product (HDZ55) Thickness: 2.3 mm 560/560 g/m2 — Lapse of time: 4,000h

Post hot-dip galvanized product (HDZ55) Thickness: 2.3 mm 560/560 g/m2

Reference scale: 20mm

Appearances of cut edges after salt spray test

500h Thickness: 2.3 mm 90/90 g/m2 — Lapse of time: 500h

1000h Thickness: 2.3 mm 90/90 g/m2 — Lapse of time: 1,000h

2000h Thickness: 2.3 mm 90/90 g/m2 — Lapse of time: 2,000h

4000h Thickness: 2.3 mm 90/90 g/m2 — Lapse of time: 4,000h

ZAM® Thickness: 2.3 mm 90/90 g/m2

Reference scale: 5mm

500h Post hot-dip galvanized product (HDZ55) Thickness: 2.3 mm 560/560 g/m2 — Lapse of time: 500h

1000h Post hot-dip galvanized product (HDZ55) Thickness: 2.3 mm 560/560 g/m2 — Lapse of time: 1,000h

2000h Post hot-dip galvanized product (HDZ55) Thickness: 2.3 mm 560/560 g/m2 — Lapse of time: 2,000h

4000h Post hot-dip galvanized product (HDZ55) Thickness: 2.3 mm 560/560 g/m2 — Lapse of time: 4,000h

Post hot-dip galvanized product (HDZ55) Thickness: 2.3 mm 560/560 g/m2

Reference scale: 5mm

Post hot-dip products are first cut to shape and then coated.

Corrosion resistance comparison in a sulfur dioxide environment

ZAM®shows better corrosion resistance compare to post hot-dip zinc-coated steel sheets (HDZ55) in a sulfur dioxide (sulfurous acid gas) environment.

Appearances after 450 hours of sulfur dioxide test

ZAM Thickness: 2.3 mm 90/90 g/m2

Reference scale: 10mm

Post hot-dip galvanized product (HDZ55) Thickness: 2.3 mm 560/560 g/m2

Reference scale: 10mm

Corrosion loss of ZAM®and post hot-dip galvanized product in sulfur dioxide test

Test conditions／
Sulfur dioxide concentration:
100 ppm
Testing temperature:
40°C
Relative humidity:
98% or more

Corrosion loss of ZAM® and post hot-dip galvanized product in sulfur dioxide test

Corrosion resistance comparison in acid rain simulated combined-cycle corrosion test

ZAM® shows better corrosion resistance compare to post hot-dip zinc-coated steel sheets (HDZ55) in an acid rain environment.

Corrosion loss of ZAM® and post hot-dip galvanized product in acid rain simulated combined-cycle corrosion test

0.05g/m2/cycle

ZAM® 90/90 g/m2untreated

0.32g/m2/cycle

Post hot-dip galvanized product 560/560 g/m2untreated

Note: Mean value during 500 cycles

Corrosion loss of ZAM® and post hot-dip galvanized product in acid rain simulated combined-cycle corrosion test

Corrosion loss of ZAM® and post hot-dip galvanized product in acid rain simulated combined-cycle corrosion test

Test conditions

Test conditions