COATING AND ELECTRONIC COMPONENT
The present invention provides a coating 10 provided on a conductor 20, the coating 10 has a first layer 12 containing palladium and a second layer 14 containing gold from the conductor 20 side, the first layer 12 has a first region 31 on the conductor 20 side and a second region 32 arranged nearer to the second layer 14 than the first region 31, and the second region 32 has a higher phosphorus concentration than the first region 31.
1 . A coating provided on a conductor, comprising:
a first layer containing palladium and a second layer containing gold from the conductor side,
wherein the first layer has a first region, and a second region arranged nearer to the second layer than the first region, and
wherein the second region has a higher phosphorus concentration than the first region.
2 . The coating according to claim 1 , wherein the first layer has an inside layer including the first region and an outside layer including the second region, from the conductor side.
3 . The coating according to claim 1 , wherein at least one of the first region and the second region has the phosphorus concentration decreasing with decreasing distance to the conductor.
4 . The coating according to claim 2 , wherein at least one of the first region and the second region has the phosphorus concentration decreasing with decreasing distance to the conductor.
5 . The coating according to claim 1 , wherein the phosphorus concentration in the first region is not more than 0.01% by mass and the phosphorus concentration in the second region is more than 0.01% by mass and not more than 7% by mass.
6 . The coating according to claim 2 , wherein the phosphorus concentration in the first region is not more than 0.01% by mass and the phosphorus concentration in the second region is more than 0.01% by mass and not more than 7% by mass.
7 . The coating according to claim 3 , wherein the phosphorus concentration in the first region is not more than 0.01% by mass and the phosphorus concentration in the second region is more than 0.01% by mass and not more than 7% by mass.
8 . The coating according to claim 1 , wherein the first layer has the thickness in the range of 0.1 to 0.4 μm.
9 . The coating according to claim 2 , wherein the first layer has the thickness in the range of 0.1 to 0.4 μm.
10 . The coating according to claim 3 , wherein the first layer has the thickness in the range of 0.1 to 0.4 μm.
11 . The coating according to claim 1 , comprising an underlying layer containing nickel between the conductor and the first layer.
12 . The coating according to claim 2 , comprising an underlying layer containing nickel between the conductor and the first layer.
13 . The coating according to claim 3 , comprising an underlying layer containing nickel between the conductor and the first layer.
14 . An electronic component comprising a signal transmission part having the coating as defined in claim 1 , and the conductor coated with the coating.
15 . An electronic component comprising a signal transmission part having the coating as defined in claim 2 , and the conductor coated with the coating.
16 . An electronic component comprising a signal transmission part having the coating as defined in claim 3 , and the conductor coated with the coating.