Coatings selection factors costs

Top Goats. The selection of a top coat depends on cost, method of appHcation, and product use and performance requirements, among other factors. As a result of increasingly stringent air quaHty standards and increased solvent costs, approaches to reduction of solvent emissions are being sought. 

Under normal conditions on repair sites it seems likely that a more reliable bond can be achieved by using a bond coat rather than by relying on any natural bond between fresh and hardened Portland cement concretes(2). However, bonding agents for use on site must be tolerant of site conditions, be reliable and cannot be selected solely on the basis of slant shear results. The bonding performance of carefully applied SBR and acrylic latex/cement slurry coats appears to be similar to that of epoxy resin bonding aids(14). However, other factors such as open time, barrier coat effects and cost may affect the final choice. 

Selection of the most promising coatings and coating processes will be made after the charcicterization task. Criteria for selection will include not only performance (i.e., wear, adhesion, friction coefficient, thermal shock resistance and thermal stability) but manufacturability/cost factors as well. Using these criteria, a coating system having acceptable cost/benefit relationships will be selected. 

Industrial coatings are based on polymers much more diverse than those used in trade paints. Their trend toward water-based polymers is much slower because of a lower emotional factor and a higher product liability from hasty change. Nevertheless, the mounting prices of petrochemicals and of methane and alternate energy costs of curing films rapidly in a finishing line do imply selective trends toward water-... 

Other factors to be considered in the lining selection include service life, maintenance cycles, operating cycles, and reliability of the lining. Different protective coatings provide different degrees of protection for different periods of time at a variety of costs. Allowable downtime of the facility for inspection and maintenance must also be considered, in terms of frequency and length of time. 

It is the most important factor for the selection of coating. The cost is related to the importance of the structure to be coated and life of the coating system. The life of the system would, in turn, depend on several factors, such as surface preparation, quality of the coating, proper application, proper curing, maintenance and monitoring. The cost factor is important but not a deciding factor in areas of civil and military strategic importance. Frequency of maintenance is an important factor. 

This chapter reviews MS-SOFC development with a focus given to the main issues affecting performance and longevity of single cells. It addresses the selection of alloy materials on the basis of their composition, thermal expansion coefficient, costs, grain size, and corrosion rates. Protective coatings, new cell architectures, and advanced fabrication processes are then presented to illustrate the level of technical refinement currently achieved. Performance of produced MS-SOFCs is finally discussed to pinpoint factors contributing to major electrochemical losses and possible routes for improvement are reported. 

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