NIPPON STEEL CORPORATION

Chemical resistance

Quality

Acid / alkali resistance

Test method
・Solution: Starting with an aqueous solution containing 1 g/L Na2SO4 as the base mix, its pH was varied from 1 to 14 by adding H2SO4 on the acidic side and NaOH on the alkaline side.
・To determine corrosion loss test pieces (n = 3) were immersed for 24 hours in a solution adjusted to each pH at 30°C, and the corrosion loss was determined. The cut edges and bottom surfaces of the test pieces were sealed.

In acidic and alkaline aqueous solutions, ZAM™ shows the same cor rosion behavior as other zinc-based coated steel sheets.

Corrosion weight losses of coated steel sheets
in acidic and alkaline aqueous solutions

(Thickness: 2.3 mm, coating weight: 80/80 g/m2, untreated)

Acid/alkali resistance

Ammonia resistance

Test method
After immersion for 24 hours in 5% ammonia water at 22°C, the corrosion loss of each test pieces were measured. The cut edges and bottom surfaces of the test pieces were sealed.

ZAM™ shows better resistance toammonia than hot-dip zinc-coated and hot-dip 55% aluminum-zinc alloy coated steel sheet

Corrosion weight loss of coated steel sheets in ammonia water

Ammonia resistance

Results of exposure test in a closed compost house
(5 years)

ZAM™ showed better corrosion resistance than hot-dip 55%Al-Zn alloy coated sheet.
(No red rust occurred in any of the flat sections bent sections, and cut edges.)

Results of exposure test in a closed compost house (5 years)ZAM

ZAM™

Hot-dip 55%Al-Zn
alloy coated

Results of exposure test in a closed compost house (5 years) ZAM Shibetsu-City, Hokkaido

Exposure test in a compost house
(Shibetsu-City, Hokkaido)

Flat part
Flat partZAM™ : K27 ZG treatment
2t bent sections
2t bent sections ZAM™ : ZG treatment
Cut edge
Cut edge ZAM™ : ZG treatment

ZAM™ : K27 ZG treatment

Flat part Hot-dip 55%Al-Zn alloy coated AZ150 Organic chromate treatment
2t bent sections Hot-dip 55%Al-Zn alloy coated AZ150 Organic chromate treatment
Cut edge Hot-dip 55%Al-Zn alloy coated AZ150 Organic chromate treatment

Hot-dip 55%Al-Zn alloy coated AZ150 Organic chromate treatment

Applications to cattle sheds and compost depots

Superior in both ammonia and humid resistances, ZAM™ is suitable for use in harsh environments such as cattle sheds and compost depots which are highly corrosive and humid due to feces and urine, and breathing of domestic animals.