Patent ID: 11905600
Assignee: NIPPON STEEL CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. An Al-plated hot stamped steel material comprising
a steel base material,
an Al-plating layer formed on at least one surface of the steel base material, and
a chemical conversion coating formed on the Al-plating layer and containing zinc phosphate-based crystals and Ce-based compounds deposited on surfaces of the zinc phosphate-based crystals,
wherein an amount of deposition of the zinc phosphate-based crystals in the chemical conversion coating is 0.3 to 4.0 g/m2as determined by measuring an amount of deposition of metal Zn in the chemical conversion coating by fluorescent X-ray analysis based on JIS G 3314: 2011, and
an area ratio of the Ce-based compounds in the chemical conversion coating is 0.5 to 25%.