Component

Abstract

The invention provides a component which can set the thickness of cladding layer exposed to a surface of an external part to be thinner and restrains corrosion of the plating layer and a base metal for a long time in a stable state. The component (1) possesses a main body part (11) formed by metal materials; a bottom cladding layer (12) comprising an Ni cladding layer and covering the surface of the main body part (11); a multi-pore cladding layer (13) covered by the bottom cladding layer (12); and a surface cladding layer (14) formed on the surface of the multi-pore cladding layer (13) and exposed to the external part. The multi-pore cladding layer (13) is configured to be a multi-pore plasmid with a multi-pore structure (13a). The surface cladding layer (14) is configured to make the multi-pore structure (13a) dispersed on the surface of the multi-pore cladding layer (13) expose to the external part. The ionization tendency of the metal forming the surface cladding layer (14) is smaller than the ionization tendency of the metal forming the multi-pore cladding layer (13).

Description

technical field [0001] The present invention relates to a metal member having a plated layer formed on the surface. Background technique [0002] For parts made of metal materials, in order to suppress corrosion, it is usually achieved by forming a plating layer on the surface. In particular, components that can be used in harsh environments from the perspective of corrosion often have a plating layer formed on the exposed surface. The plating layer is composed of a noble metal with good corrosion resistance such as gold, silver, gold alloy, silver alloy, etc. . [0003] The above-mentioned precious metals are expensive, and therefore it is required to reduce the thickness of the plating layer on the surface layer of components made of the metal, and to set the thickness of the plating layer to be very thin. However, when the thickness of the plating layer on the surface layer made of noble metal becomes thin, small pores called pinholes are likely to be formed. When pinh...

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned precious metals are expensive, so it is required to thin the plating layer on the surface layer of the parts made of this metal, and set the thickness of the plating layer to be very thin.

However, if the thickness of the plating layer on the surface layer made of precious metals becomes thinner, small pores called pinholes are likely to be formed.

When pinholes are generated, there is a problem that the plating layer of the base exposed from the pinholes or the metal of the base material tends to corrode quickly due to electrolytic corrosion (galvanic corrosion)

However, in the environment where the parts are used for a long time, the sealing agent may be slowly lost

Therefore, there is a problem that it is difficult to suppress corrosion in a stable state for a long time

Images