Metal separator plate for fuel cell having coating film formed on surface and method for producing same

摘要

Disclosed herein is a method for manufacturing a metal steel separator for fuel cells that has corrosion resistance and contact resistance not only at an initial stage but also after being exposed to high temperature/high humidity conditions in the fuel cell for a long period of time. The method includes preparing a stainless steel sheet as a matrix of the metal separator, forming a discontinuous coating film on the surface of the stainless steel sheet, the coating film being composed of at least one selected from gold (Au), platinum (Pt), ruthenium (Ru), iridium (Ir), ruthenium oxide (RuO2), and iridium oxide (IrO2), and heat treating the stainless steel sheet having the discontinuous coating film to form an oxide film on a portion of the stainless steel sheet on which the coating film is not formed. A metal separator for fuel cells manufactured by the method is also disclosed.

主权项

1. A method for manufacturing a metal separator for fuel cells, comprising:
preparing a stainless steel sheet as a matrix of the metal separator; forming a discontinuous coating film on a surface of the stainless steel sheet, the discontinuous coating film being composed of at least one of the group consisting of gold (Au), platinum (Pt), ruthenium (Ru), iridium (Ir), ruthenium oxide (RuO2), and iridium oxide (IrO2), the discontinuous coating film consisting of nanoparticles having a particle size of 10 nm to 1000 nm; and heat treating the stainless steel sheet having the discontinuous coating film to form an oxide film on a portion of the stainless steel sheet on which the discontinuous coating film is not formed, wherein the discontinuous coating film has a coating density of 5 to 500 μg/cm2.