developing cost-effective and feasible alternative materials. Based on their observations, a defect- and pinhole-free coating can be achieved with excellent corrosion resistance and negligible interfacial contact resistance. 105 developed a preferential thermal nitridation process in which a nickel-chromium alloy was coated with a thin layer of CrN/Cr2N. The former can poison the solid polymer electrolyte as well as the catalyst layer by releasing corrosion byproducts (Fe3, Cr3, Ni2, etc. It is important to note that corrosion can take place both at the anode and the cathode of an operating pemfc. It was noted that true corrosion representation cannot be obtained from such plots. Become AN author, we market your book worldwide across all retail channels. It is important to point out that ICR and corrosion resistant tests performed in simulated PEM environments must be carried out at high temperatures (6090C) and long periods (several hundreds or even thousands of hours resembling real fuel cell environments. Through Cengage Publishing you can expect the finest in web-based course support for the Knowledge Base including workbooks, study guides, online testing, test item data banks, and much more. Well take care of payments and royalties.
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One of the promising techniques in surface treatment of austenitic stainless steels is carburization. At a compaction force of 135 N cm2, samples coated with CrN layer thicknesses of 3 and 4 m exhibited similar ICR values of 8 and.5 m cm2, respectively, while the coated samples with a CrN thickness of 5 m generated the lowest contact resistant (6 m cm2). For information about JBCs scope, mission, metrics and more, click here. An exploded view of a PEM fuel cell stack is shown in Figure. Silver, gold, and platinum coatings are too expensive to consider for mass production, and nickel coatings do not meet the DOE requirement for ICR. Last updated December 11, 2017. Types of Metals Metals, such as titanium and stainless steels, exhibit excellent mechanical properties and have very low gas permeation rates. (iv) Interfacial contact resistance: 20 m cm2 at 150 N cm2. Noble and Nonnoble Metal Coatings Although great success has been made in lowering the ICR and corrosion rates by using various noble metals, including gold and platinum-group metals, the cost is too great for mass production in terrestrial applications. 93 examined gold-plated titanium bipolar plates in a single cell with a 25 cm2 active area. This can be attributed to the formation of columnar gaps and surface defects during extended pack cementation.
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