access icon free Carbon composite coatings on Ti for corrosion protection as bipolar plates of proton exchange membrane fuel cells

A highly corrosion resistant and conductive composite coating on Ti bipolar plates was prepared by the hydrothermal and impregnation method. The composite coating consisted of amorphous carbon immersed in suspension solution [polytetrafluoroethylene (PTFE) 10 wt.% + TiN nanoparticles 3 g/l]. The surface of coating was completely smooth and nano-holes on the surface of coatings were filled by PTFE and TiN particles. TiN particles were uniformly distributed in the coating when 0.1 mol/l of glucose was used as carbon source. The composite coating exhibited excellent conductivity and corrosion resistivity. It was revealed that corrosion current density, interfacial contact resistance, and contact angle were 0.009 µA/cm2, 13 mΩ cm2, and 115.53°, respectively. Meanwhile, it was shown that the corrosion current density of the coating was below 1 µA/cm2 with a potentiostatic polarisation test (0.6 and −0.1 V). In summary, the Ti substrate with a carbon composite film immersed in suspension solution showed a great potential application in bipolar plates of proton exchange membrane fuel cells.

Inspec keywords: thin films; suspensions; corrosion resistance; carbon; filled polymers; plates (structures); corrosion protection; titanium; corrosion protective coatings; corrosion testing; amorphous state; electrical conductivity; nanocomposites; liquid phase deposition; titanium compounds; contact resistance; particle reinforced composites; current density; nanoparticles; contact angle; proton exchange membrane fuel cells

Other keywords: amorphous carbon; contact angle; nanoparticles; bipolar plates; electrical conductivity; C-TiN; carbon composite coatings; voltage -0.1 V; corrosion current density; PTFE; corrosion resistivity; impregnation method; proton exchange membrane fuel cells; Ti; interfacial contact resistance; potentiostatic polarisation test; corrosion protection; glucose; conductive composite coating; carbon composite film; hydrothermal method; polytetrafluoroethylene; suspension solution; voltage 0.6 V; corrosion resistant coating

Subjects: Electrical properties of thin films, low-dimensional and nanoscale structures; Contact resistance, contact potential, and work functions; Preparation of reinforced polymers and polymer-based composites; Nanofabrication using thin film deposition methods; Fluid surface energy (surface tension, interface tension, angle of contact, etc.); Deposition from liquid phases; Thin film growth, structure, and epitaxy; Materials testing; Fuel cells; Surface treatment and degradation of metals and alloys; Nondestructive materials testing methods; Emulsions and suspensions; Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials; Structure of amorphous, disordered and polymeric materials; Polymers and plastics (engineering materials science); Fuel cells; Composite materials (engineering materials science); Deposition from liquid phases (melts and solutions)

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http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2018.0076
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