Comparison of properties with various types of coated steel sheets

Corrosion resistance on flat parts

ZAM® has better resistance to red rust than galvanized and hot-dip zinc-5% aluminum alloy coated steel sheets.

Red rust occurrence after salt spray test (untreated)

Corrosion resistance on flat parts

Results of salt spray test (SST: JIS Z 2371) Appearances of specimens after salt spray test

(Coating weight: 90/90 g/m2, untreated)

500h　ZAM ® — Lapse of time: 500h

1200h　ZAM ® — 1,200h

2500h　ZAM ® — 2,500h

ZAM®

500h 55% Al-Zn alloy coated steel — Lapse of time：500h

1200h 55% Al-Zn alloy coated steel — 1,200h

2500h 55% Al-Zn alloy coated steel — 2,500h

55% Al-Zn alloy coated steel

500h Zn-5% Al alloy coated steel — Lapse of time：500h

1200h Zn-5% Al alloy coated steel — 1,200h

2500h Zn-5% Al alloy coated steel — 2,500h

Zn-5% Al alloy coated steel

500h Galvanized steel — Lapse of time：500h

1200h Galvanized steel — 1,200h

2500h Galvanized steel — 2,500h

Galvanized steel

基準スケール10mm

Corrosion resistance on cut edge

ZAM® shows better red-rust resistance (durability) on cut edge than any other coated steel sheet.

Appearances of cut edges after salt spray test

(Thickness: 3.2 mm, coating weight: 120/120 g/m2, untreated)

100h　ZAM ® — Lapse of time：100h

1000h　ZAM ® — 1,000h

5000h　ZAM ® — 5,000h

ZAM®

500h 55% Al-Zn alloy coated steel — Lapse of time：100h

1000h 55% Al-Zn alloy coated steel — 1,000h

55% Al-Zn alloy coated steel

100h Zn-5% Al alloy coated steel — Lapse of time: 100h

1000h Zn-5% Al alloy coated steel — 1,000h

5000h Zn-5% Al alloy coated steel — 5,000h

Zn-5% Al alloy coated steel

500h Galvanized steel — Lapse of time: 100h

1000h Galvanized steel — 1,000h

Galvanized steel

基準スケール5mm

Change in the appearance of cut edge during outdoor exposure test

The cut edge of ZAM® will be covered with a protective film and change to a subdued color as time passes.

Appearances of cut edge sections after outdoor exposure test (testing location: seaside industrial area in Sakai)

(Thickness: 2.3 mm, coating weight: 90/90 g/m2, chromate treatment: 50 mg/m2)

After 2 weeks ZAM ® — Lapse of time:
After 2 weeks

After 3 months ZAM ® — After 3 months

After 6 months ZAM ® — After 6 months

ZAM®

After 2 weeks 55% Al-Zn alloy coated steel — Lapse of time:
After 2 weeks

After 3 months 55% Al-Zn alloy coated steel — After 3 months

After 6 months 55% Al-Zn alloy coated steel — After 6 months

55% Al-Zn alloy coated steel

After 2 weeks Zn-5% Al alloy coated steel — Lapse of time:
After 2 weeks

After 3 months Zn-5% Al alloy coated steel — After 3 months

After 6 months Zn-5% Al alloy coated steel — After 6 months

Zn-5% Al alloy coated steel

After 2 weeks Galvanized steel — Lapse of time:
After 2 weeks

After 3 months Galvanized steel — After 3 months

After 6 months Galvanized steel — After 6 months

Galvanized steel

Corrosion resistance of bent sections

ZAM® shows better corrosion (red-rust) resistance even in bent sections than any other coated steel sheets.

Appearances of 1t bent section after salt spray test

(1t, 180º bending, thickness: 3.2 mm, 120/120 g/m2, untreated)

100h ZAM ® — Lapse of time: 100h

1,000h ZAM ® — 1,000h

4,000h ZAM ® — 4,000h

ZAM®

100h 55% Al-Zn alloy coated steel — Lapse of time: 100h

1,000h 55% Al-Zn alloy coated steel — 1,000h

55% Al-Zn alloy coated steel

100h Zn-5% Al alloy coated steel — Lapse of time: 100h

1,000h Zn-5% Al alloy coated steel — 1,000h

4,000h Zn-5% Al alloy coated steel — 4,000h

Zn-5% Al alloy coated steel

100h Galvanized steel — Lapse of time: 100h

1,000h Galvanized steel — 1,000h

Galvanized steel

Reference scale: 5mm

Change in appearance at bent section during outdoor exposure test

ZAM® shows almost no change in appearance at the bent section.

Appearances of 1t bent section after outdoor exposure test

(1t, 180º bending, thickness: 3.2 mm, 120/120 g/m2, untreated)

30days ZAM ® — Lapse of time: 30 days

90days ZAM ® — 90days

ZAM®

30days 55% Al-Zn alloy coated steel — Lapse of time: 30days

90days 55% Al-Zn alloy coated steel — 90days

55% Al-Zn alloy coated steel

30days Zn-5% Al alloy coated steel — Lapse of time: 30days

90days Zn-5% Al alloy coated steel — 90days

Zn-5% Al alloy coated steel

30days Galvanized steel — Lapse of time: 30days

90days Galvanized steel — 90days

Galvanized steel

Reference scale: 10mm

Corrosion resistance of drawn sections

ZAM® shows better corrosion resistance on drawn parts compared to hot-dip zinc-5% aluminum alloy coated steel sheets.

Appearances of drawn parts after salt spray test

(drawing height: 25 mm, thickness: 0.8 mm, coating weight: 70/70 g/m2, untreated)

100h ZAM ® — Lapse of time: 0h

1,000h ZAM ® — 1,000h

2,000h ZAM ® — 2,000h

ZAM®

100h Zn-5% Al alloy coated steel — Lapse of time: 0h

1,000h Zn-5% Al alloy coated steel — 1,000h

2,000h Zn-5% Al alloy coated steel — 2,000h

Zn-5% Al alloy coated steel

Red rust
occurred.

Reference scale: 10mm