NIPPON STEEL CORPORATION

Comparison in characteristics with
post galvanized (Electrogalvanized)
and post-painted (Cationic electrodeposition coating)
products

Quality

Results of combined-cycle corrosion tests of flat parts and cut edges

ZAM™ shows better corrosion resistance than post hot-dip galvanized and post-painted products.

Appearances of flat parts and cut edges after combined-cycle corrosion test

Thickness: 2.3 mm

Before test
Before testZAM™
60 cycles
60 cycles ZAM™
120 cycles
120 cycles ZAM™

ZAM™：90/90 g/m2 ZC treatment

Before test
Before test Post galvanized (Electrogalvanized)100 / 100g / m2 Chromate 100 mg/m2
60 cycles
60 cycles Post galvanized (Electrogalvanized)100 / 100g / m2 Chromate 100 mg/m2
120 cycles
120 cycles Post galvanized (Electrogalvanized)100 / 100g / m2 Chromate 100 mg/m2

Post galvanized (Electrogalvanized)100 / 100g / m2 Chromate 100 mg/m2

Before test
Before test ZAM™
60 cycles
60 cycles ZAM™
120 cycles
Red rust
occurred
120 cycles ZAM™

Post-painted (Cationic electrode position coating)Film thickness:15μm

Test conditions
JASO M609-91

Test conditions
*Post galvanized and post-painting were also provided on the cut edges.

Reference scale: 20mm

Results of combined-cycle corrosion tests of drawn section

Drawn sections of ZAM™ exhibit better corrosion resistance than those of post galvanized steel (galvanized after processing).

Appearances of drawn section after combined-cycle corrosion test

Drawing height: 25 mm, thickness: 0.8 mm

Before test
Before test ZAM™
60 cycles
60 cycles ZAM™
120 cycles
120 cycles ZAM™

ZAM™ thickness: 0.8 mm 90/90 g/m2 ZC treatment

Before test
Before test Post galvanized (Electrogalvanized) 100/100 g/m2 Chromate 100 mg/m2
60 cycles
60 cycles Post galvanized (Electrogalvanized) 100/100 g/m2 Chromate 100 mg/m2
120 cycles
120 cycles Post galvanized (Electrogalvanized) 100/100 g/m2 Chromate 100 mg/m2

Post galvanized (Electrogalvanized) 100/100 g/m2 Chromate 100 mg/m2

*Post galvanizing was conducted after processing. The cut edges were sealed.

Reference scale: 20mm