Patent ID: 11920228
Assignee: MITSUBISHI MATERIALS CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A copper alloy plate, wherein
in a center part in a plate thickness direction, a center Mg concentration is 0.1 mass % or more and less than 0.3 mass %, a center P concentration is 0.001 mass % or more and 0.2 mass % or less, and the balance Cu and inevitable impurities,
a surface Mg concentration on a surface is 70% or less of the center Mg concentration, and
a surface layer part defined by a prescribed thickness from the surface has a concentration gradient of Mg concentration increasing from the surface toward the center part in the plate thickness direction at 0.05 mass %/μm or more and 5 mass %/μm or less, and Mg concentration in a deepest part is 90% of the center Mg concentration.