A titanium material includes a base material made of pure titanium or a titanium alloy; and a carbon layer covering a surface of the base material. The carbon layer includes non-graphitizable carbon, and has an R value (I.sub.1350/I.sub.1590) of 2.0 or more and 3.5 or less in the Raman spectroscopy using laser having a wavelength of 532 nm. Where I.sub.1350 is peak intensity at a wave number of around 1.3510.sup.5 m.sup.1 in a Raman spectrum, and I.sub.1590 is peak intensity at a wave number of around 1.5910.sup.5 m.sup.1 in a Raman spectrum. According to this titanium material, it is possible to realize low contact resistance by the carbon layer. Moreover, this titanium material is not susceptible to surface oxidation and capable of maintaining low contact resistance even when exposed to noble potential.

The invention relates to an anti-corrosion conductive film and a pulse bias alternation-based magnetron sputtering deposition method and application thereof. The anti-corrosion conductive film is formed by sequentially forming an anti-corrosion protective layer, a stress transition layer and a conducting layer on the surface of a substrate by deposition through a high-low pulse bias alternation method. Compared with the prior art, the invention has the following advantages: high and low biases, the proportion of deposition times and the number of alternations are adjusted to control a nano-multilayer anti-corrosion conductive film to develop towards higher conductivity; and the bias alternation strategy inhibits the growth of columnar structures of the nano-multilayer alternate coating structure, thus avoiding a corrosion channel and improving the corrosion resistance, and changes the micro-structure of the coating through bias modulation, thus improving the conductivity and galvanic corrosion, so that the nano-multilayer anti-corrosion conductive film has better comprehensive performance such as the corrosion resistance and the conductivity and has great application prospects in the fields of metal polar plates of fuel cells, ground grid equipment of power transmission lines, and the like.

Corrosion-resistant oxide films for use with proton exchange membrane fuel cells are described. Bipolar plates of proton exchange membrane fuel cells are subject to highly-acidic environments that can degrade the bulk material and associated properties of the bipolar plate leading to reduced proton exchange membrane fuel cell lifetimes. Materials, structures, and techniques for increasing the corrosion resistance of bipolar plates are disclosed. Such materials include substrates having a surface portion, which includes an Fe.sub.2O.sub.3 oxide layer having (110), (012), or (100) Fe.sub.2O.sub.3 surface facets configured to impart corrosion-resistance properties to the substrate.

Corrosion-resistant oxide films for use with proton exchange membrane fuel cells are described. Bipolar plates of proton exchange membrane fuel cells are subject to highly-acidic environments that can degrade the bulk material and associated properties of the bipolar plate leading to reduced proton exchange membrane fuel cell lifetimes. Materials, structures, and techniques for increasing the corrosion resistance of bipolar plates are disclosed. Such materials include substrates having a surface portion, which includes an Fe.sub.2O.sub.3 oxide layer having (110), (012), or (100) Fe.sub.2O.sub.3 surface facets configured to impart corrosion-resistance properties to the substrate.

A fuel cell separator having high corrosion resistance even in an environment where fluoride ions are present, which is a fuel cell separator comprising a metal base material, a tin oxide film provided on a surface of the metal base material, and a conductive polymer film provided at least on an area exposed due to a defect present on the tin oxide film on the surface of the metal base material.

A fuel cell separator having high corrosion resistance even in an environment where fluoride ions are present, which is a fuel cell separator comprising a metal base material, a tin oxide film provided on a surface of the metal base material, and a conductive polymer film provided at least on an area exposed due to a defect present on the tin oxide film on the surface of the metal base material.

The present invention regards a method for depositing a material layer on a metallic interconnector or support for fuel cells or cells for electrolysis. A deposition method is provided which allows applying a protective ceramic material layer on metallic supports of complex geometry, such as the metallic interconnectors of the fuel cells.

The present invention regards a method for depositing a material layer on a metallic interconnector or support for fuel cells or cells for electrolysis. A deposition method is provided which allows applying a protective ceramic material layer on metallic supports of complex geometry, such as the metallic interconnectors of the fuel cells.

Provided is a separator for a fuel cell that can suppress a decrease in the power generation performance of the fuel cell by reducing the contact resistance of the separator. Specifically, provided is a separator for a fuel cell, the separator being adapted to be in contact with a MEGA (power generation portion) including a membrane electrode assembly of the fuel cell so as to separate the MEGA from a MEGA of an adjacent fuel cell, the separator including a metal substrate made of metal; and a tin oxide film covering a surface of the metal substrate on the side of the MEGA. The tin oxide film is made of tin oxide containing 0.2 to 10 atom % of antimony.

Provided is a separator for a fuel cell that can suppress a decrease in the power generation performance of the fuel cell by reducing the contact resistance of the separator. Specifically, provided is a separator for a fuel cell, the separator being adapted to be in contact with a MEGA (power generation portion) including a membrane electrode assembly of the fuel cell so as to separate the MEGA from a MEGA of an adjacent fuel cell, the separator including a metal substrate made of metal; and a tin oxide film covering a surface of the metal substrate on the side of the MEGA. The tin oxide film is made of tin oxide containing 0.2 to 10 atom % of antimony.