Graphite VS Stainless Steel

[Llew2_1]

I have 40 hours up bench testing my SS 316, they show no signs of deteriation. It absorbs 30volt 100 amp continious. The plates in my HOD are 80 sq inches each, 14 of them. Making 10 LPM.
Llew

[rboos]

Hi All,

I am pretty new at this...

I read that if the electrical conductivity of Copper (Cu) was considered 100%, Stainless stell would be around 3.5%... so why the modern dry cells are using SS? Is it for electrode durability, or we don't want too much electrical conductivity?

My guess would be durability of SS x Cu.

Ah, what about Titanium (electrical conductivity around 3.1%) similar to SS... And what about the Ni-Ti alloy?

Last question! Can we use aluminum electrodes?

Maybe in some of the electrodes above the components would act as electrolyzers..

Sorry for the question flood!

Rod.
(Bulding my 1st dry cell, SS plates + Ni-Ti filaments)

[hhonewbie]

Hi All,

I am pretty new at this...

I read that if the electrical conductivity of Copper (Cu) was considered 100%, Stainless stell would be around 3.5%... so why the modern dry cells are using SS? Is it for electrode durability, or we don't want too much electrical conductivity?

My guess would be durability of SS x Cu.

Ah, what about Titanium (electrical conductivity around 3.1%) similar to SS... And what about the Ni-Ti alloy?

Last question! Can we use aluminum electrodes?

Maybe in some of the electrodes above the components would act as electrolyzers..

Sorry for the question flood!

Rod.
(Bulding my 1st dry cell, SS plates + Ni-Ti filaments)

Answer: SS for durability & affordability

[Humanoid_1]

Ok here we go, some Electrical Resistivity info for you guys:
(did write conductivity originally)

Cu
ohm-cm 0.00000170
ohm-cir-mil/ft 10.2
ohm-in 6.69e-7
ohm-m 1.70e-8
ohm-mm²/m 0.0170

Ti
ohm-cm 0.0000554
ohm-cir-mil/ft 333
ohm-in 0.0000218
ohm-m 5.54e-7
ohm-mm²/m 0.554

304L
0.0000720 ohm-cm
ohm-cir-mil/ft 433
ohm-in 0.0000283
ohm-m 7.20e-7
ohm-mm²/m 0.720

316 or 316L as same
ohm-cm 0.0000740
ohm-cir-mil/ft 445
ohm-in 0.0000291
ohm-m 7.40e-7
ohm-mm²/m 0.740

Extruded Graphite
ohm-cm 0.000750
ohm-cir-mil/ft 4510
ohm-in 0.000295
ohm-m 0.00000750
ohm-mm²/m 7.50


Should answer a few questions

[rboos]

Hmm... those are condutivity values, or resistivity? the copper is lower in value than the SS... shouldn't be the opposite?

Another idea, just for the mad scientists:

what about this process of marking (electro-engraving?? ) the SS with a "tatoo" of graphite... we could apply a 'inverted V' pattern to 'guide' the bubbles, or just a set of 'straight vertical lines' to guide them... with graphite agains the SS plates?

It could make the total area bigger, I found a site with some examples:

Graphite engraved SS examples (artistic)

Just an idea..

[Humanoid_1]

Sorry, my mistake - was Rather late last night.

they are the Electrical Resistivity values.

Will edit my post too.