| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrical contact which prevents stress corrosion particularly because of having a plated layer with a reduced residual stress formed thereon, is superior in corrosion resistance and is stable in its performance. SOLUTION: The plated layer is formed by stacked plated films of a tensile-stress plated layer 3a and a compressive-stress plated layer 3b, to constitute an underlayer 3 or a precious metal layer 4. Further, a plated structure is formed by stacking a plurality of the tensile-stress plated layers 3a and the compressive-stress plated layers 3b. Thereby, the plated layer having the reduced residual stress inside the plated layer is obtained, and the residual stress can be removed by heat-treating the plated layer. The tensile-stress plated layer and the compressive-stress plated layer can be formed by varying a type of a plating bath to be used in plating treatment, a type of a brightener to be added to the plating bath or a current density during the plating treatment. COPYRIGHT: (C)2011,JPO&INPIT |
