Fuel Cell Separator Coating Layout for Acid-Resistant Manufacturing
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Solution Overview
Problem
Conventional fuel cell separator manufacturing processes are inefficient and lack sufficient acid resistance, particularly in strongly acidic environments, due to the need for multiple surface treatments on both sides of stainless steel substrates.
Innovation Solution
A fuel cell separator configuration featuring a stainless steel substrate with a dissimilar metal layer and carbon layer on the power-generating portion, and a resin layer on the outer peripheral portion, which includes the dissimilar metal layer and carbon layer, and a resin layer on the substrate, allowing for continuous coverage and protection from acidic atmospheres, while enabling simultaneous formation on both surfaces during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple surface treatments (acid-resistant film and conductive film) are formed on both front and back surfaces of the stainless steel substrate, then acid resistance and conductivity are improved, but the manufacturing process complexity and time increase
Solution Approach 1:
The patent applies different treatments to different regions of the separator. The power-generating portion receives both acid-resistant film (Ta, Zr, Nb, Ti, or Ni-Cr alloy) and conductive film (Au, Pt, or Pd) treatments, while the outer peripheral portion receives only the acid-resistant film treatment. This local differentiation reduces manufacturing complexity by eliminating the need to form conductive films on non-power-generating areas, while maintaining sufficient acid resistance across the entire substrate.
2Reliability
If multiple surface treatments are performed on both surfaces of the substrate, then sufficient acid resistance is achieved, but the manufacturing efficiency decreases
Solution Approach 1:
The invention forms the acid-resistant film on the entire surface of the stainless steel substrate including both power-generating and outer peripheral portions, while limiting the conductive film formation only to the power-generating portion. This approach ensures comprehensive acid resistance protection while reducing manufacturing steps and time by avoiding conductive film deposition on areas where it is not needed.
3Ease of manufacture
If the substrate is exposed to strongly acidic atmosphere without sufficient protection, then manufacturing is simpler, but acid resistance is insufficient leading to material elution
Solution Approach 1:
The patent segments the separator into two functional regions: the power-generating portion with dual-layer protection (acid-resistant film + conductive film) and the outer peripheral portion with single-layer protection (acid-resistant film only). This segmentation allows the substrate to be protected against acid corrosion in critical areas while simplifying the manufacturing process by reducing treatments in non-critical areas.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances manufacturing efficiency and provides sufficient acid resistance by preventing substrate exposure to acidic environments and allowing for simultaneous formation of dissimilar metal and carbon layers on both surfaces, reducing material elution and improving process efficiency.
Implementation Method 1
the acid-resistant film is formed on the surface of a metal plate serving as a substrate of a stainless steel plate or the like by a PVD method or the like, following which the conductive film is further formed by a PVD method or the like
Data Source
AI summary
The present invention is directed to a fuel cell separator 1 included in a fuel cell, and the fuel cell separator 1 includes: a substrate 11 made of stainless steel; a middle portion 30 including a power generating portion; and an outer peripheral portion 20 including a non-power generating portion. The middle portion 30 includes a dissimilar metal layer 12 different from the stainless steel included in the substrate on the substrate, and a carbon layer 13 provided on the dissimilar metal layer 12, and the outer peripheral portion 20 includes a portion including the dissimilar metal layer 12, the carbon layer 13, and a resin layer 14 on the carbon layer, and a portion not including the dissimilar metal layer 12 or the carbon layer 13, and including the resin layer 14 on the substrate.