PROBLEM TO BE SOLVED: To prevent a mounted electronic component from the state not connected normally to an external electric circuit for a long time by preventing separation between a nickel-plated layer and solder SOLUTION: A wiring board includes an insulating board 1, a wiring conductor 2 formed on the board 1, a nickel-plated layer 9 deposited on the wiring conductor 2, and solder 7, 8 bonded on the nickel-plated layer 9 The nickel- plated layer 9 has a trench formed along a nickel grain boundary and having a depth of 02 μm or less

Wiring board and electronic device using the same

Provided is a fuel cell separator comprising a substrate, a first plating layer formed on the substrate, and a gold plating layer formed on the first plating layer by electroless plating, said fuel cell separator being characterized in that an arithmetic average roughness (Ra) of the surface of the first plating layer facing the gold plating layer is 80 nm or less. According to the present invention, the gold plating layer can be uniformly formed on an uneven portion constituting a gas flow path, and a non-forming portion and pin holes are prevented from occurring in the gold plating layer without increasing the film thickness of the gold plating layer, thereby enabling a fuel cell separator excellent in corrosion resistance and conductivity to be provided.

Fuel cell separator, fuel battery cell, fuel cell stack, and method for manufacturing fuel cell separator

A separator for fuel cells is provided. The separator includes: a base material; an underlying alloy layer formed on the base material; and a gold plate layer formed on the underlying alloy layer. The separator is characterized in that the underlying alloy layer is formed of an M1-M2-M3 alloy (where M1 is at least one element selected from Ni, Fe, Co, Cu, Zn and Sn, M2 is at least one element selected from Pd, Re, Pt, Rh, Ag and Ru, and M3 is at least one element selected from P and B).

Separator for fuel cells, fuel cell, fuel cell stack, and method of manufacturing separator for fuel cells

PROBLEM TO BE SOLVED: To provide a separator for fuel cell in which a gold plating layer can be formed uniformly for the irregularities constituting a gas passage, a non-formation part in the gold plating layer and generation of pinholes are prevented without thickening the gold plating layer, and excellent corrosion resistance and conductivity are ensured.SOLUTION: A separator for fuel cell includes a base material, a base plating layer formed on the base material, and a gold plating layer formed on the base plating layer by electroless plating. The arithmetic average roughness Ra on the side of the base plating layer facing the gold plating layer is 80 nm or less.

Separator for fuel cell, fuel cell, fuel cell stack, and method of manufacturing separator for fuel cell

PROBLEM TO BE SOLVED: To improve the adhesive strength between an electroless nickel plating film and solder at the time of soldering and to improve the yield in the soldering stage by specifying the ten point average roughness of the surface of an electroless nickel plating substrate film formed on a stock in which an electroless gold plating film formed. SOLUTION: An electroless nickel plating substrate is formed on a stock, and, an electroless gold plating film is formed on the electroless nickel plating substrate. At this time, the ten point average roughness of the surface of the electroless nickel plating film to be formed on the stock is controlled to 0.5 to 1.5 μm. Moreover, the thickness of the electroless nickel plating film to be formed on the stock is preferably controlled to 7 to 15 μm. Furthermore, the electroless nickel plating film can be formed on the stock with an electroless nickel plating soln., as a reducing agent, using sodium hypophosphite added with 0.01 to 0.05 mL/L sulfur compd. as a stabilizer. Moreover, by executing chemical or mechanical polishing, the ten point average roughness of the surface can be controlled to the range.

Hirofumi Murata

Papers

Electroless gold plating method