Titanium has low density and high specific strength, its electrical and thermal conductivity are similar 

to stainless steel, and its corrosion resistance is very excellent, its passivability exceeds that of 

aluminum, nickel and stainless steel, and it has the characteristics of low passivation potential, 

small critical passivation current, wide passivation potential and high passivation stability, so titanium 

is also one of the main choice materials for PEMFC bipolar plates. As with stainless steel, the 

passivation film on the surface of titanium will cause the titanium bipolar plate to have a high 

contact resistance. Park et al. [54] compared the performance of Ti alloy, 316L and 410 stainless steel 

as bipolar plates of direct methanol fuel cells. In 0.001mol/ L H, SO,+2mg/ L F medium, the corrosion 

current densities of Ti alloy, 316L and 410 stainless steel are 3.39x10" A /cm2, 2.49x10" A /cm2 and

 3.28x10' A /cm2, respectively, as shown in Figure 2-43. However, the test results of the battery pack 

(Figure 2-44) show that the battery with STS410 stainless steel as a bipolar plate has the best 

performance, with a power of 106mW/cm2, the battery with 316L stainless steel as a bipolar plate 

has a power of 93mW/cm2, and the battery with Ti as a bipolar plate has a maximum power of only

 62mW/cm2. Although the passivation film on the surface of Ti significantly improves the corrosion 

resistance of Ti metal, due to the fact that the passivation film on the surface of Ti is an electronic 

insulator, the battery with Ti as a bipolar plate has a high resistance (112mΩ/cm2), which significantly

 degrades the battery performance.

Titanium bipolar plate is also known as titanium mother plate, titanium electrolytic plate. Titanium

 bipolar plate

Material: TA1 TA2 TC4

Specification: Thickness δ0.4 ~ δ50.

Classification: Single channel titanium bipolar plate, double channel titanium alloy bipolar plate, three 

channel titanium metal bipolar plate

Machining type: CNC machining center (thickness greater than 3mm), etching machining (1-3mm), 

stamping processing (less than 1mm)

Plating: platinum plating, gold plating,

Requirements: Annealed and levelled, no defects, no inclusions, no scratches.

Surface: smooth and smooth

Processing equipment: Machining center, electric spark, grinding machine,

Features: Long electrode life; No pollution to the medium; Corrosion resistance.

GR1 hydrogen titanium electrode plate (ultra-precision titanium foil) can be freely cut according to

 use, bipolar plate is a key component of proton exchange membrane fuel cells.

Hydrogen titanium electrode plate (GR1 titanium foil) Product parameters: thickness 0.1-0.3mm, 

length and width size, 300mm*800mm, free cutting, round, square, shaped.

The newly developed bipolar plate materials are mainly divided into three categories, namely 

graphite bipolar plate, composite bipolar plate and metal bipolar plate.

Hydrogen titanium electrode plate (GR1 titanium foil) compared to titanium metal bipolar plate thin 

thickness (δ≤0.15mm), high mechanical strength and good gas isolation, conducive to the 

improvement of battery specific power density, in addition to the metal material processing

 technology is mature, can be used to process high-precision complex flow field on the ultra-thin 

titanium strip by stamping, molding and laser forming. It is easy to achieve the quantitative

 production of plates, and has become the mainstream bipolar plate material for hydrogen fuel cells, 

but its molding process requires that the bipolar plate substrate needs to have high dimensional 

accuracy, plate shape, good strong plastic ratio and low yield to strength ratio to ensure that the 

substrate deformation is uniform, wrinkleless, non-tearing and small rebound in the process of 

molding and stamping.