Post-paintability

Results of corrosion tests of painted materials

ZAM® is superior to other coated steel sheets in terms of corrosion resistance after painting.

Appearances of coated materials after corrosion test (cross cut sections)

1. As with Hot-dip Zn-5%Al alloy coated, it is recommended to control the concentrations of treatment solutions because aluminum contained in the coating layer dissolves into pre-treatment (zinc phosphate treatment) solutions and lessens their effects.
2. The above painting data is an example. It is recommended that each customer test and check the paintability beforehand.
3. When chemically-treated substrate is used, application of adequate primer is recommended.

① SST: JIS Z2371 (neutral salt spray test) 35°C, continuous spraying with 5% NaCl
② CCT: JASO M609-91 (combined-cycle corrosion test)
SST (2 hrs) → Drying (4 hrs) → BBT (2 hrs)
Material tested: Untreated material of each coated steel sheet
Pre-treatment: Zinc phosphate treatment (PALBOND 138)
Paint: Acrylic resin Super Lac F-50 Film thickness: 30 μm

Source: Nippon Steel