By E. Morales
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Extra resources for Alloy Steel - Properties and Use
These high prices prohibit the utilization of theses metals as bipolar plate material for commercial use. Table 2 compares the costs of gold and other usable materials. 19 Table 2. Bipolar plate material and high-volume material costs  4. Stainless steel alloys To further increase the power density of fuel cells and to decrease the costs of the stacks, the use of very thin steel bipolar plates which can be formed in a low cost hydroforming process would be beneficial. 1 Untreated The major concerns for bulk metal alloys are the corrosion resistance against the harsh environment and the resulting increase in contact resistance once the passive layer forms on the surface.
2011). , 2007), but their impact on the surface chemical composition was revealed only recently. Figures 11 and 12, and the above arguments give clear evidence for the magnetic origin of the stability of Cr enriched surfaces for bulk concentrations beyond the (9%) threshold. It should be pointed out that the strongly nonlinear change of the surface Cr content versus bulk composition is due to the delicate balance between bulk and surface effects. In particular, the lack of Cr at the surface of Ferich alloys is a direct consequence of the anomalous mixing of Fe and Cr at low Cr concentrations, which in its turn has a magnetic origin.
The most common types are polymer electrolyte fuel cells PEFC (developed by William Grubb in 1959), the alkaline fuel cell AFC (developed for the Apollo space Program in the 1960’s), the phosphoric acid fuel cell PAFC (from 1965), the molten carbonate fuel cell MCFC and the solid oxide fuel cells SOFC. The beginnings of SOFC and MCFC can be dated back to the mid 1960’s . 2 Importance of fuel cells Global warming and the political situation pushed the focus further to the renewable energy sources such as wind and solar energy.
Alloy Steel - Properties and Use by E. Morales